diff --git a/roentgen.py b/roentgen.py
index e667d30..5287d6c 100644
--- a/roentgen.py
+++ b/roentgen.py
@@ -18,31 +18,32 @@ from roentgen.grid import draw_icons
 from roentgen.icon import ShapeExtractor
 from roentgen.mapper import (
     AUTHOR_MODE,
-    CREATION_TIME_MODE,
-    Painter,
+    TIME_MODE,
+    Map,
     check_level_number,
     check_level_overground,
 )
 from roentgen.osm_getter import NetworkError, get_osm
-from roentgen.osm_reader import Map, OSMReader, OverpassReader
+from roentgen.osm_reader import OSMData, OSMReader, OverpassReader
 from roentgen.point import Point
 from roentgen.scheme import LineStyle, Scheme
 from roentgen.ui import BoundaryBox, parse_options
 from roentgen.util import MinMax
-from roentgen.workspace import workspace
+from roentgen.workspace import Workspace
 
 
 def main(options) -> None:
     """
     Röntgen entry point.
 
-    :param argv: command-line arguments
+    :param options: command-line arguments
     """
+    if not options.boundary_box and not options.input_file_name:
+        logging.fatal("Specify either --boundary-box, or --input.")
+        exit(1)
+
     if options.boundary_box:
-        box: List[float] = list(
-            map(float, options.boundary_box.replace(" ", "").split(","))
-        )
-        boundary_box = BoundaryBox(box[0], box[1], box[2], box[3])
+        boundary_box: BoundaryBox = BoundaryBox.from_text(options.boundary_box)
 
     cache_path: Path = Path(options.cache)
     cache_path.mkdir(parents=True, exist_ok=True)
@@ -53,28 +54,35 @@ def main(options) -> None:
         input_file_names = list(map(Path, options.input_file_name))
     else:
         try:
-            get_osm(boundary_box, cache_path)
+            cache_file_path: Path = (
+                cache_path / f"{boundary_box.get_format()}.osm"
+            )
+            get_osm(boundary_box, cache_file_path)
         except NetworkError as e:
             logging.fatal(e.message)
             sys.exit(1)
-        input_file_names = [cache_path / f"{options.boundary_box}.osm"]
+        input_file_names = [cache_file_path]
 
     scheme: Scheme = Scheme(workspace.DEFAULT_SCHEME_PATH)
     min_: np.array
     max_: np.array
-    map_: Map
+    osm_data: OSMData
 
     if input_file_names[0].name.endswith(".json"):
         reader: OverpassReader = OverpassReader()
         reader.parse_json_file(input_file_names[0])
 
-        map_ = reader.map_
+        osm_data = reader.osm_data
         view_box = MinMax(
-            np.array((map_.boundary_box[0].min_, map_.boundary_box[1].min_)),
-            np.array((map_.boundary_box[0].max_, map_.boundary_box[1].max_)),
+            np.array(
+                (osm_data.boundary_box[0].min_, osm_data.boundary_box[1].min_)
+            ),
+            np.array(
+                (osm_data.boundary_box[0].max_, osm_data.boundary_box[1].max_)
+            ),
         )
     else:
-        is_full: bool = options.mode in [AUTHOR_MODE, CREATION_TIME_MODE]
+        is_full: bool = options.mode in [AUTHOR_MODE, TIME_MODE]
         osm_reader = OSMReader(is_full=is_full)
 
         for file_name in input_file_names:
@@ -84,24 +92,19 @@ def main(options) -> None:
 
             osm_reader.parse_osm_file(file_name)
 
-        map_ = osm_reader.map_
+        osm_data = osm_reader.osm_data
 
         if options.boundary_box:
-            boundary_box: List[float] = list(
-                map(float, options.boundary_box.split(","))
-            )
             view_box = MinMax(
-                np.array((boundary_box[1], boundary_box[0])),
-                np.array((boundary_box[3], boundary_box[2])),
+                np.array((boundary_box.bottom, boundary_box.left)),
+                np.array((boundary_box.top, boundary_box.right)),
             )
         else:
-            view_box = map_.view_box
+            view_box = osm_data.view_box
 
     flinger: Flinger = Flinger(view_box, options.scale)
     size: np.array = flinger.size
 
-    Path("out").mkdir(parents=True, exist_ok=True)
-
     svg: svgwrite.Drawing = svgwrite.Drawing(
         options.output_file_name, size=size
     )
@@ -131,7 +134,7 @@ def main(options) -> None:
             return True
 
     constructor: Constructor = Constructor(
-        map_,
+        osm_data,
         flinger,
         scheme,
         icon_extractor,
@@ -141,17 +144,14 @@ def main(options) -> None:
     )
     constructor.construct()
 
-    painter: Painter = Painter(
+    painter: Map = Map(
         overlap=options.overlap,
         mode=options.mode,
         label_mode=options.label_mode,
-        map_=map_,
         flinger=flinger,
         svg=svg,
-        icon_extractor=icon_extractor,
         scheme=scheme,
     )
-
     painter.draw(constructor)
 
     print(f"Writing output SVG to {options.output_file_name}...")
@@ -164,16 +164,18 @@ def draw_element(options):
     Draw single node, line, or area.
     """
     if options.node:
-        target = "node"
+        target: str = "node"
         tags_description = options.node
     else:
         # Not implemented yet.
         sys.exit(1)
 
-    tags = dict([x.split("=") for x in tags_description.split(",")])
-    scheme: Scheme = Scheme(Path("scheme/default.yml"))
+    tags: dict[str, str] = dict(
+        [x.split("=") for x in tags_description.split(",")]
+    )
+    scheme: Scheme = Scheme(workspace.DEFAULT_SCHEME_PATH)
     extractor: ShapeExtractor = ShapeExtractor(
-        Path("icons/icons.svg"), Path("icons/config.json")
+        workspace.ICONS_PATH, workspace.ICONS_CONFIG_PATH
     )
     processed: Set[str] = set()
     icon, priority = scheme.get_icon(extractor, tags, processed)
@@ -193,8 +195,8 @@ def draw_element(options):
     size: np.array = point.get_size() + border
     point.point = np.array((size[0] / 2, 16 / 2 + border[1] / 2))
 
-    Path("out").mkdir(parents=True, exist_ok=True)
-    svg = svgwrite.Drawing("out/element.svg", size.astype(float))
+    output_file_path: Path = workspace.output_path / "element.svg"
+    svg = svgwrite.Drawing(str(output_file_path), size.astype(float))
     for style in scheme.get_style(tags, 18):
         style: LineStyle
         path = svg.path(d="M 0,0 L 64,0 L 64,64 L 0,64 L 0,0 Z")
@@ -203,44 +205,47 @@ def draw_element(options):
     point.draw_main_shapes(svg)
     point.draw_extra_shapes(svg)
     point.draw_texts(svg)
-    svg.write(open("out/element.svg", "w+"))
+    with output_file_path.open("w+") as output_file:
+        svg.write(output_file)
+    logging.info(f"Element is written to {output_file_path}.")
 
 
 def init_scheme() -> Scheme:
-    return Scheme(Path("scheme/default.yml"))
+    return Scheme(workspace.DEFAULT_SCHEME_PATH)
 
 
 if __name__ == "__main__":
 
     logging.basicConfig(format="%(levelname)s %(message)s", level=logging.INFO)
+    workspace: Workspace = Workspace(Path("out"))
 
-    options: argparse.Namespace = parse_options(sys.argv)
+    arguments: argparse.Namespace = parse_options(sys.argv)
 
-    if options.command == "render":
-        main(options)
+    if arguments.command == "render":
+        main(arguments)
 
-    elif options.command == "tile":
+    elif arguments.command == "tile":
         from roentgen import tile
 
-        tile.ui(options)
+        tile.ui(arguments)
 
-    elif options.command == "icons":
+    elif arguments.command == "icons":
         draw_icons()
 
-    elif options.command == "mapcss":
+    elif arguments.command == "mapcss":
         from roentgen import mapcss
 
-        mapcss.ui(options)
+        mapcss.ui(arguments)
 
-    elif options.command == "element":
-        draw_element(options)
+    elif arguments.command == "element":
+        draw_element(arguments)
 
-    elif options.command == "server":
+    elif arguments.command == "server":
         from roentgen import server
 
-        server.ui(options)
+        server.ui(arguments)
 
-    elif options.command == "taginfo":
+    elif arguments.command == "taginfo":
         from roentgen.taginfo import write_taginfo_project_file
 
         write_taginfo_project_file(init_scheme())
diff --git a/roentgen/color.py b/roentgen/color.py
index bd2c705..7f563f9 100644
--- a/roentgen/color.py
+++ b/roentgen/color.py
@@ -37,6 +37,7 @@ def get_gradient_color(
     range_coefficient: float = (
         0 if bounds.is_empty() else (value - bounds.min_) / bounds.delta()
     )
+    # If value is out of range, set it to boundary value.
     range_coefficient = min(1.0, max(0.0, range_coefficient))
     index: int = int(range_coefficient * color_length)
     coefficient: float = (
diff --git a/roentgen/constructor.py b/roentgen/constructor.py
index 3fee833..a58979a 100644
--- a/roentgen/constructor.py
+++ b/roentgen/constructor.py
@@ -4,31 +4,33 @@ Construct Röntgen nodes and ways.
 import logging
 from datetime import datetime
 from hashlib import sha256
-from typing import Any, Dict, Iterator, List, Optional, Set
+from typing import Any, Iterator, Optional, Union
 
 import numpy as np
 from colour import Color
 
 from roentgen import ui
 from roentgen.color import get_gradient_color
-from roentgen.figure import Building, Road, StyledFigure
+from roentgen.figure import Building, Road, StyledFigure, Tree, DirectionSector
 from roentgen.flinger import Flinger
 
 # fmt: off
 from roentgen.icon import (
     DEFAULT_SMALL_SHAPE_ID, Icon, IconSet, ShapeExtractor, ShapeSpecification
 )
-from roentgen.osm_reader import Map, OSMNode, OSMRelation, OSMWay, Tagged
+from roentgen.osm_reader import OSMData, OSMNode, OSMRelation, OSMWay
 from roentgen.point import Point
 from roentgen.scheme import DEFAULT_COLOR, LineStyle, Scheme
+from roentgen.ui import TIME_MODE, AUTHOR_MODE
 from roentgen.util import MinMax
+
 # fmt: on
 
 __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"
 
 DEBUG: bool = False
-TIME_COLOR_SCALE: List[Color] = [
+TIME_COLOR_SCALE: list[Color] = [
     Color("#581845"),
     Color("#900C3F"),
     Color("#C70039"),
@@ -38,14 +40,14 @@ TIME_COLOR_SCALE: List[Color] = [
 ]
 
 
-def line_center(nodes: List[OSMNode], flinger: Flinger) -> np.array:
+def line_center(nodes: list[OSMNode], flinger: Flinger) -> np.array:
     """
     Get geometric center of nodes set.
 
     :param nodes: node list
     :param flinger: flinger that remap geo positions
     """
-    boundary: List[MinMax] = [MinMax(), MinMax()]
+    boundary: list[MinMax] = [MinMax(), MinMax()]
 
     for node in nodes:
         boundary[0].update(node.coordinates[0])
@@ -74,14 +76,14 @@ def get_time_color(time: Optional[datetime], boundaries: MinMax) -> Color:
     return get_gradient_color(time, boundaries, TIME_COLOR_SCALE)
 
 
-def glue(ways: List[OSMWay]) -> List[List[OSMNode]]:
+def glue(ways: list[OSMWay]) -> list[list[OSMNode]]:
     """
     Try to glue ways that share nodes.
 
     :param ways: ways to glue
     """
-    result: List[List[OSMNode]] = []
-    to_process: Set[OSMWay] = set()
+    result: list[list[OSMNode]] = []
+    to_process: set[OSMWay] = set()
 
     for way in ways:
         if way.is_cycle():
@@ -112,9 +114,7 @@ def glue(ways: List[OSMWay]) -> List[List[OSMNode]]:
 
 
 def is_cycle(nodes) -> bool:
-    """
-    Is way a cycle way or an area boundary.
-    """
+    """Is way a cycle way or an area boundary."""
     return nodes[0] == nodes[-1]
 
 
@@ -125,7 +125,7 @@ class Constructor:
 
     def __init__(
         self,
-        map_: Map,
+        osm_data: OSMData,
         flinger: Flinger,
         scheme: Scheme,
         icon_extractor: ShapeExtractor,
@@ -136,59 +136,51 @@ class Constructor:
         self.check_level = check_level
         self.mode: str = mode
         self.seed: str = seed
-        self.map_: Map = map_
+        self.osm_data: OSMData = osm_data
         self.flinger: Flinger = flinger
         self.scheme: Scheme = scheme
         self.icon_extractor = icon_extractor
 
-        self.points: List[Point] = []
-        self.figures: List[StyledFigure] = []
-        self.buildings: List[Building] = []
-        self.roads: List[Road] = []
+        self.points: list[Point] = []
+        self.figures: list[StyledFigure] = []
+        self.buildings: list[Building] = []
+        self.roads: list[Road] = []
+        self.trees: list[Tree] = []
+        self.direction_sectors: list[DirectionSector] = []
 
-        self.heights: Set[float] = {2, 4}
+        self.heights: set[float] = {2, 4}
 
     def add_building(self, building: Building) -> None:
-        """
-        Add building and update levels.
-        """
+        """Add building and update levels."""
         self.buildings.append(building)
         self.heights.add(building.height)
         self.heights.add(building.min_height)
 
     def construct(self) -> None:
-        """
-        Construct nodes, ways, and relations.
-        """
+        """Construct nodes, ways, and relations."""
         self.construct_ways()
         self.construct_relations()
         self.construct_nodes()
 
     def construct_ways(self) -> None:
-        """
-        Construct Röntgen ways.
-        """
-        way_number: int = 0
-        for way_id in self.map_.ways:
+        """Construct Röntgen ways."""
+        for index, way_id in enumerate(self.osm_data.ways):
             ui.progress_bar(
-                way_number,
-                len(self.map_.ways),
+                index,
+                len(self.osm_data.ways),
                 step=10,
                 text="Constructing ways",
             )
-            way_number += 1
-            way: OSMWay = self.map_.ways[way_id]
-            if not self.check_level(way.tags):
-                continue
+            way: OSMWay = self.osm_data.ways[way_id]
             self.construct_line(way, [], [way.nodes])
 
-        ui.progress_bar(-1, len(self.map_.ways), text="Constructing ways")
+        ui.progress_bar(-1, len(self.osm_data.ways), text="Constructing ways")
 
     def construct_line(
         self,
-        line: Optional[Tagged],
-        inners: List[List[OSMNode]],
-        outers: List[List[OSMNode]],
+        line: Union[OSMWay, OSMRelation],
+        inners: list[list[OSMNode]],
+        outers: list[list[OSMNode]],
     ) -> None:
         """
         Way or relation construction.
@@ -199,22 +191,22 @@ class Constructor:
         """
         assert len(outers) >= 1
 
+        if not self.check_level(line.tags):
+            return
+
         center_point, center_coordinates = line_center(outers[0], self.flinger)
-        if self.mode in ["user-coloring", "time"]:
-            if self.mode == "user-coloring":
+        if self.mode in [AUTHOR_MODE, TIME_MODE]:
+            color: Color
+            if self.mode == AUTHOR_MODE:
                 color = get_user_color(line.user, self.seed)
-            else:  # self.mode == "time":
-                color = get_time_color(line.timestamp, self.map_.time)
+            else:  # self.mode == TIME_MODE
+                color = get_time_color(line.timestamp, self.osm_data.time)
             self.draw_special_mode(inners, line, outers, color)
             return
 
         if not line.tags:
             return
 
-        scale: float = self.flinger.get_scale(center_coordinates)
-
-        line_styles: List[LineStyle] = self.scheme.get_style(line.tags, scale)
-
         if "building:part" in line.tags or "building" in line.tags:
             self.add_building(
                 Building(line.tags, inners, outers, self.flinger, self.scheme)
@@ -225,6 +217,9 @@ class Constructor:
             self.roads.append(Road(line.tags, inners, outers, road_matcher))
             return
 
+        scale: float = self.flinger.get_scale(center_coordinates)
+        line_styles: list[LineStyle] = self.scheme.get_style(line.tags, scale)
+
         for line_style in line_styles:
             self.figures.append(
                 StyledFigure(line.tags, inners, outers, line_style)
@@ -235,7 +230,7 @@ class Constructor:
                 and line.get_tag("area") != "no"
                 and self.scheme.is_area(line.tags)
             ):
-                processed: Set[str] = set()
+                processed: set[str] = set()
 
                 priority: int
                 icon_set: IconSet
@@ -257,7 +252,7 @@ class Constructor:
 
         if not line_styles:
             if DEBUG:
-                style: Dict[str, Any] = {
+                style: dict[str, Any] = {
                     "fill": "none",
                     "stroke": Color("red").hex,
                     "stroke-width": 1,
@@ -267,7 +262,7 @@ class Constructor:
                 )
                 self.figures.append(figure)
 
-            processed: Set[str] = set()
+            processed: set[str] = set()
 
             priority: int
             icon_set: IconSet
@@ -285,7 +280,7 @@ class Constructor:
         """
         Add figure for special mode: time or author.
         """
-        style: Dict[str, Any] = {
+        style: dict[str, Any] = {
             "fill": "none",
             "stroke": color.hex,
             "stroke-width": 1,
@@ -298,84 +293,94 @@ class Constructor:
         """
         Construct Röntgen ways from OSM relations.
         """
-        for relation_id in self.map_.relations:
-            relation: OSMRelation = self.map_.relations[relation_id]
+        for relation_id in self.osm_data.relations:
+            relation: OSMRelation = self.osm_data.relations[relation_id]
             tags = relation.tags
             if not self.check_level(tags):
                 continue
             if "type" not in tags or tags["type"] != "multipolygon":
                 continue
-            inner_ways: List[OSMWay] = []
-            outer_ways: List[OSMWay] = []
+            inner_ways: list[OSMWay] = []
+            outer_ways: list[OSMWay] = []
             for member in relation.members:
                 if member.type_ == "way":
                     if member.role == "inner":
-                        if member.ref in self.map_.ways:
-                            inner_ways.append(self.map_.ways[member.ref])
+                        if member.ref in self.osm_data.ways:
+                            inner_ways.append(self.osm_data.ways[member.ref])
                     elif member.role == "outer":
-                        if member.ref in self.map_.ways:
-                            outer_ways.append(self.map_.ways[member.ref])
+                        if member.ref in self.osm_data.ways:
+                            outer_ways.append(self.osm_data.ways[member.ref])
                     else:
                         logging.warning(f'Unknown member role "{member.role}".')
             if outer_ways:
-                inners_path: List[List[OSMNode]] = glue(inner_ways)
-                outers_path: List[List[OSMNode]] = glue(outer_ways)
+                inners_path: list[list[OSMNode]] = glue(inner_ways)
+                outers_path: list[list[OSMNode]] = glue(outer_ways)
                 self.construct_line(relation, inners_path, outers_path)
 
     def construct_nodes(self) -> None:
         """
         Draw nodes.
         """
-        node_number: int = 0
-
         sorted_node_ids: Iterator[int] = sorted(
-            self.map_.nodes.keys(),
-            key=lambda x: -self.map_.nodes[x].coordinates[0],
+            self.osm_data.nodes.keys(),
+            key=lambda x: -self.osm_data.nodes[x].coordinates[0],
         )
 
-        for node_id in sorted_node_ids:
-            processed: Set[str] = set()
-
-            node_number += 1
+        for index, node_id in enumerate(sorted_node_ids):
             ui.progress_bar(
-                node_number, len(self.map_.nodes), text="Constructing nodes"
+                index, len(self.osm_data.nodes), text="Constructing nodes"
             )
-            node: OSMNode = self.map_.nodes[node_id]
-            flung = self.flinger.fling(node.coordinates)
-            tags = node.tags
+            self.construct_node(self.osm_data.nodes[node_id])
+        ui.progress_bar(-1, len(self.osm_data.nodes), text="Constructing nodes")
 
-            if not self.check_level(tags):
-                continue
+    def construct_node(self, node: OSMNode) -> None:
+        tags = node.tags
+        if not self.check_level(tags):
+            return
 
-            priority: int
-            icon_set: IconSet
-            draw_outline: bool = True
+        processed: set[str] = set()
 
-            if self.mode in ["time", "user-coloring"]:
-                if not tags:
-                    continue
-                color = DEFAULT_COLOR
-                if self.mode == "user-coloring":
-                    color = get_user_color(node.user, self.seed)
-                if self.mode == "time":
-                    color = get_time_color(node.timestamp, self.map_.time)
-                dot = self.icon_extractor.get_shape(DEFAULT_SMALL_SHAPE_ID)
-                icon_set = IconSet(
-                    Icon([ShapeSpecification(dot, color)]), [], set()
-                )
-                priority = 0
-                draw_outline = False
-                labels = []
-            else:
-                icon_set, priority = self.scheme.get_icon(
-                    self.icon_extractor, tags, processed
-                )
-                labels = self.scheme.construct_text(tags, "all", processed)
-                self.scheme.process_ignored(tags, processed)
+        flung = self.flinger.fling(node.coordinates)
+
+        priority: int
+        icon_set: IconSet
+        draw_outline: bool = True
+
+        if self.mode in [TIME_MODE, AUTHOR_MODE]:
+            if not tags:
+                return
+            color: Color = DEFAULT_COLOR
+            if self.mode == AUTHOR_MODE:
+                color = get_user_color(node.user, self.seed)
+            if self.mode == TIME_MODE:
+                color = get_time_color(node.timestamp, self.osm_data.time)
+            dot = self.icon_extractor.get_shape(DEFAULT_SMALL_SHAPE_ID)
+            icon_set = IconSet(
+                Icon([ShapeSpecification(dot, color)]), [], set()
+            )
             point: Point = Point(
-                icon_set, labels, tags, processed, flung, node.coordinates,
-                priority=priority, draw_outline=draw_outline
+                icon_set, [], tags, processed, flung, node.coordinates,
+                priority=0, draw_outline=False
             )  # fmt: skip
             self.points.append(point)
+            return
 
-        ui.progress_bar(-1, len(self.map_.nodes), text="Constructing nodes")
+        icon_set, priority = self.scheme.get_icon(
+            self.icon_extractor, tags, processed
+        )
+        labels = self.scheme.construct_text(tags, "all", processed)
+        self.scheme.process_ignored(tags, processed)
+
+        if node.get_tag("natural") == "tree" and (
+            "diameter_crown" in node.tags or "circumference" in node.tags
+        ):
+            self.trees.append(Tree(tags, node.coordinates, flung))
+            return
+
+        if "direction" in node.tags or "camera:direction" in node.tags:
+            self.direction_sectors.append(DirectionSector(tags, flung))
+        point: Point = Point(
+            icon_set, labels, tags, processed, flung, node.coordinates,
+            priority=priority, draw_outline=draw_outline
+        )  # fmt: skip
+        self.points.append(point)
diff --git a/roentgen/direction.py b/roentgen/direction.py
index cefc260..0be51b5 100644
--- a/roentgen/direction.py
+++ b/roentgen/direction.py
@@ -1,7 +1,7 @@
 """
 Direction tag support.
 """
-from typing import Iterator, List, Optional, Union
+from typing import Iterator, Optional, Union
 
 import numpy as np
 from portolan import middle
@@ -72,7 +72,7 @@ class Sector:
         self.main_direction: Optional[np.array] = None
 
         if "-" in text:
-            parts: List[str] = text.split("-")
+            parts: list[str] = text.split("-")
             self.start = parse_vector(parts[0])
             self.end = parse_vector(parts[1])
             self.main_direction = (self.start + self.end) / 2
@@ -90,7 +90,7 @@ class Sector:
                 self.start = np.dot(rotation_matrix(result_angle), vector)
                 self.end = np.dot(rotation_matrix(-result_angle), vector)
 
-    def draw(self, center: np.array, radius: float) -> Optional[List[SVGPath]]:
+    def draw(self, center: np.array, radius: float) -> Optional[list[SVGPath]]:
         """
         Construct SVG path commands for arc element.
 
@@ -139,7 +139,7 @@ class DirectionSet:
     def __str__(self) -> str:
         return ", ".join(map(str, self.sectors))
 
-    def draw(self, center: np.array, radius: float) -> Iterator[List[SVGPath]]:
+    def draw(self, center: np.array, radius: float) -> Iterator[list[SVGPath]]:
         """
         Construct SVG "d" for arc elements.
 
@@ -159,7 +159,7 @@ class DirectionSet:
         :return: true if direction is right, false if direction is left, and
             None otherwise.
         """
-        result: List[bool] = [x.is_right() for x in self.sectors]
+        result: list[bool] = [x.is_right() for x in self.sectors]
         if result == [True] * len(result):
             return True
         if result == [False] * len(result):
diff --git a/roentgen/drawing.py b/roentgen/drawing.py
index 39104b5..e71f282 100644
--- a/roentgen/drawing.py
+++ b/roentgen/drawing.py
@@ -9,10 +9,13 @@ import cairo
 import numpy as np
 import svgwrite
 from colour import Color
-from svgwrite.shapes import Rect
 from svgwrite.path import Path as SVGPath
+from svgwrite.shapes import Rect
 from svgwrite.text import Text
 
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
 
 @dataclass
 class Style:
diff --git a/roentgen/figure.py b/roentgen/figure.py
index 5aaa70e..022b745 100644
--- a/roentgen/figure.py
+++ b/roentgen/figure.py
@@ -4,7 +4,11 @@ Figures displayed on the map.
 from typing import Any, Dict, List, Optional
 
 import numpy as np
+from colour import Color
+from svgwrite import Drawing
+from svgwrite.path import Path
 
+from roentgen.direction import Sector, DirectionSet
 from roentgen.flinger import Flinger
 from roentgen.osm_reader import OSMNode, Tagged
 from roentgen.road import Lane
@@ -97,14 +101,85 @@ class Building(Figure):
         if levels:
             self.min_height = float(levels) * 2.5
 
-        height: Optional[str] = self.get_length("height")
+        height: Optional[float] = self.get_length("height")
         if height:
             self.height = height
 
-        height: Optional[str] = self.get_length("min_height")
+        height: Optional[float] = self.get_length("min_height")
         if height:
             self.min_height = height
 
+    def draw_shade(self, building_shade, flinger: Flinger) -> None:
+        """Draw shade casted by the building."""
+        scale: float = flinger.get_scale() / 3.0
+        shift_1 = np.array((scale * self.min_height, 0))
+        shift_2 = np.array((scale * self.height, 0))
+        commands: str = self.get_path(flinger, shift_1)
+        path = Path(
+            d=commands, fill="#000000", stroke="#000000", stroke_width=1
+        )
+        building_shade.add(path)
+        for nodes in self.inners + self.outers:
+            for i in range(len(nodes) - 1):
+                flung_1 = flinger.fling(nodes[i].coordinates)
+                flung_2 = flinger.fling(nodes[i + 1].coordinates)
+                command = (
+                    "M",
+                    np.add(flung_1, shift_1),
+                    "L",
+                    np.add(flung_2, shift_1),
+                    np.add(flung_2, shift_2),
+                    np.add(flung_1, shift_2),
+                    "Z",
+                )
+                path = Path(
+                    command, fill="#000000", stroke="#000000", stroke_width=1
+                )
+                building_shade.add(path)
+
+    def draw_walls(
+        self, svg: Drawing, height: float, previous_height: float, scale: float
+    ) -> None:
+        """Draw building walls."""
+        shift_1 = [0, -previous_height * scale]
+        shift_2 = [0, -height * scale]
+        for segment in self.parts:
+            if height == 2:
+                fill = Color("#AAAAAA")
+            elif height == 4:
+                fill = Color("#C3C3C3")
+            else:
+                color_part: float = 0.8 + segment.angle * 0.2
+                fill = Color(rgb=(color_part, color_part, color_part))
+
+            command = (
+                "M",
+                segment.point_1 + shift_1,
+                "L",
+                segment.point_2 + shift_1,
+                segment.point_2 + shift_2,
+                segment.point_1 + shift_2,
+                segment.point_1 + shift_1,
+                "Z",
+            )
+            path = svg.path(
+                d=command,
+                fill=fill.hex,
+                stroke=fill.hex,
+                stroke_width=1,
+                stroke_linejoin="round",
+            )
+            svg.add(path)
+
+    def draw_roof(self, svg: Drawing, flinger: Flinger, scale: float):
+        """Draw building roof."""
+        path: Path = Path(
+            d=self.get_path(flinger, np.array([0, -self.height * scale]))
+        )
+        path.update(self.line_style.style)
+        path.update({"stroke-linejoin": "round"})
+        svg.add(path)
+
 
 class StyledFigure(Figure):
     """
@@ -161,14 +236,110 @@ class Road(Figure):
                 pass
 
 
+class Tree(Tagged):
+    """
+    Tree on the map.
+    """
+
+    def __init__(
+        self, tags: dict[str, str], coordinates: np.array, point: np.array
+    ):
+        super().__init__(tags)
+        self.coordinates: np.array = coordinates
+        self.point: np.array = point
+
+    def draw(self, svg: Drawing, flinger: Flinger, scheme: Scheme):
+        """Draw crown and trunk."""
+        scale: float = flinger.get_scale(self.coordinates)
+        radius: float
+        if "diameter_crown" in self.tags:
+            radius = float(self.tags["diameter_crown"]) / 2.0
+        else:
+            radius = 2.0
+        color: Color = scheme.get_color("evergreen_color")
+        svg.add(svg.circle(self.point, radius * scale, fill=color, opacity=0.3))
+
+        if "circumference" in self.tags:
+            radius: float = float(self.tags["circumference"]) / 2.0 / np.pi
+            svg.add(svg.circle(self.point, radius * scale, fill="#B89A74"))
+
+
+class DirectionSector(Tagged):
+    """
+    Sector that represents direction.
+    """
+
+    def __init__(self, tags: dict[str, str], point):
+        super().__init__(tags)
+        self.point = point
+
+    def draw(self, svg: Drawing, scheme: Scheme):
+        """Draw gradient sector."""
+        angle = None
+        is_revert_gradient: bool = False
+
+        if self.get_tag("man_made") == "surveillance":
+            direction = self.get_tag("camera:direction")
+            if "camera:angle" in self.tags:
+                angle = float(self.get_tag("camera:angle"))
+            if "angle" in self.tags:
+                angle = float(self.get_tag("angle"))
+            direction_radius: float = 25
+            direction_color: Color = scheme.get_color("direction_camera_color")
+        elif self.get_tag("traffic_sign") == "stop":
+            direction = self.get_tag("direction")
+            direction_radius: float = 25
+            direction_color: Color = Color("red")
+        else:
+            direction = self.get_tag("direction")
+            direction_radius: float = 50
+            direction_color: Color = scheme.get_color("direction_view_color")
+            is_revert_gradient = True
+
+        if not direction:
+            return
+
+        point = (self.point.astype(int)).astype(float)
+
+        if angle:
+            paths = [Sector(direction, angle).draw(point, direction_radius)]
+        else:
+            paths = DirectionSet(direction).draw(point, direction_radius)
+
+        for path in paths:
+            radial_gradient = svg.radialGradient(
+                center=point,
+                r=direction_radius,
+                gradientUnits="userSpaceOnUse",
+            )
+            gradient = svg.defs.add(radial_gradient)
+            if is_revert_gradient:
+                (
+                    gradient
+                    .add_stop_color(0, direction_color.hex, opacity=0)
+                    .add_stop_color(1, direction_color.hex, opacity=0.7)
+                )  # fmt: skip
+            else:
+                (
+                    gradient
+                    .add_stop_color(0, direction_color.hex, opacity=0.4)
+                    .add_stop_color(1, direction_color.hex, opacity=0)
+                )  # fmt: skip
+            path_element: Path = svg.path(
+                d=["M", point] + path + ["L", point, "Z"],
+                fill=gradient.get_paint_server(),
+            )
+            svg.add(path_element)
+
+
 class Segment:
     """
     Line segment.
     """
 
     def __init__(self, point_1: np.array, point_2: np.array):
-        self.point_1 = point_1
-        self.point_2 = point_2
+        self.point_1: np.array = point_1
+        self.point_2: np.array = point_2
 
         difference: np.array = point_2 - point_1
         vector: np.array = difference / np.linalg.norm(difference)
@@ -215,9 +386,7 @@ def make_counter_clockwise(polygon: List[OSMNode]) -> List[OSMNode]:
 
 
 def get_path(nodes: List[OSMNode], shift: np.array, flinger: Flinger) -> str:
-    """
-    Construct SVG path commands from nodes.
-    """
+    """Construct SVG path commands from nodes."""
     path: str = ""
     prev_node: Optional[OSMNode] = None
     for node in nodes:
diff --git a/roentgen/flinger.py b/roentgen/flinger.py
index 396a935..e6f709f 100644
--- a/roentgen/flinger.py
+++ b/roentgen/flinger.py
@@ -27,10 +27,13 @@ def pseudo_mercator(coordinates: np.array) -> np.array:
     return np.array((coordinates[1], y))
 
 
-def osm_zoom_level_to_pixels_per_meter(zoom_level: float):
+def osm_zoom_level_to_pixels_per_meter(zoom_level: float) -> float:
     """
-    Convert OSM zoom level (see https://wiki.openstreetmap.org/wiki/Zoom_levels)
-    to pixels per meter on Equator.
+    Convert OSM zoom level to pixels per meter on Equator. See
+    https://wiki.openstreetmap.org/wiki/Zoom_levels
+
+    :param zoom_level: integer number usually not bigger than 20, but this
+        function allows any non-negative float value
     """
     return 2 ** zoom_level / 156415
 
diff --git a/roentgen/grid.py b/roentgen/grid.py
index 2f47e71..4ae6479 100644
--- a/roentgen/grid.py
+++ b/roentgen/grid.py
@@ -4,7 +4,7 @@ Icon grid drawing.
 import logging
 from dataclasses import dataclass
 from pathlib import Path
-from typing import List, Optional, Set
+from typing import Optional
 
 import numpy as np
 from colour import Color
@@ -24,7 +24,7 @@ class IconCollection:
     Collection of icons.
     """
 
-    icons: List[Icon]
+    icons: list[Icon]
 
     @classmethod
     def from_scheme(
@@ -45,7 +45,7 @@ class IconCollection:
         :param add_unused: create icons from shapes that have no corresponding
             tags
         """
-        icons: List[Icon] = []
+        icons: list[Icon] = []
 
         def add() -> Icon:
             """
@@ -80,7 +80,7 @@ class IconCollection:
                 continue
             for icon_id in matcher.under_icon:
                 for icon_2_id in matcher.with_icon:
-                    current_set: List[str] = (
+                    current_set: list[str] = (
                         [icon_id] + [icon_2_id] + matcher.over_icon
                     )
                     add()
@@ -99,7 +99,7 @@ class IconCollection:
                         ):
                             add()
 
-        specified_ids: Set[str] = set()
+        specified_ids: set[str] = set()
 
         for icon in icons:
             specified_ids |= set(icon.get_shape_ids())
@@ -199,17 +199,18 @@ def draw_icons() -> None:
     Draw all possible icon shapes combinations as grid in one SVG file and as
     individual SVG files.
     """
-    icons_by_id_path: Path = workspace.get_icons_by_id_path()
-    icons_by_name_path: Path = workspace.get_icons_by_name_path()
-
     scheme: Scheme = Scheme(workspace.DEFAULT_SCHEME_PATH)
     extractor: ShapeExtractor = ShapeExtractor(
         workspace.ICONS_PATH, workspace.ICONS_CONFIG_PATH
     )
     collection: IconCollection = IconCollection.from_scheme(scheme, extractor)
+
     icon_grid_path: Path = workspace.get_icon_grid_path()
     collection.draw_grid(icon_grid_path)
     logging.info(f"Icon grid is written to {icon_grid_path}.")
+
+    icons_by_id_path: Path = workspace.get_icons_by_id_path()
+    icons_by_name_path: Path = workspace.get_icons_by_name_path()
     collection.draw_icons(icons_by_id_path)
     collection.draw_icons(icons_by_name_path, by_name=True)
     logging.info(
diff --git a/roentgen/icon.py b/roentgen/icon.py
index 34a9b5d..6137927 100644
--- a/roentgen/icon.py
+++ b/roentgen/icon.py
@@ -6,7 +6,7 @@ import logging
 import re
 from dataclasses import dataclass, field
 from pathlib import Path
-from typing import Any, Dict, List, Optional, Set
+from typing import Any, Optional
 from xml.dom.minidom import Document, Element, parse
 
 import numpy as np
@@ -44,13 +44,13 @@ class Shape:
     id_: str  # shape identifier
     name: Optional[str] = None  # icon description
     is_right_directed: Optional[bool] = None
-    emojis: Set[str] = field(default_factory=set)
+    emojis: set[str] = field(default_factory=set)
     is_part: bool = False
 
     @classmethod
     def from_structure(
         cls,
-        structure: Dict[str, Any],
+        structure: dict[str, Any],
         path: str,
         offset: np.array,
         id_: str,
@@ -102,7 +102,7 @@ class Shape:
         :param offset: additional offset
         :param scale: scale resulting image
         """
-        transformations: List[str] = []
+        transformations: list[str] = []
         shift: np.array = point + offset
 
         transformations.append(f"translate({shift[0]},{shift[1]})")
@@ -137,7 +137,7 @@ def verify_sketch_element(element, id_: str) -> bool:
     if not element.getAttribute("style"):
         return True
 
-    style: Dict = dict(
+    style: dict = dict(
         [x.split(":") for x in element.getAttribute("style").split(";")]
     )
     if (
@@ -177,8 +177,8 @@ class ShapeExtractor:
         :param svg_file_name: input SVG file name with icons.  File may contain
             any other irrelevant graphics.
         """
-        self.shapes: Dict[str, Shape] = {}
-        self.configuration: Dict[str, Any] = json.load(
+        self.shapes: dict[str, Shape] = {}
+        self.configuration: dict[str, Any] = json.load(
             configuration_file_name.open()
         )
         with svg_file_name.open() as input_file:
@@ -233,7 +233,7 @@ class ShapeExtractor:
                     name = child_node.childNodes[0].nodeValue
                     break
 
-            configuration: Dict[str, Any] = (
+            configuration: dict[str, Any] = (
                 self.configuration[id_] if id_ in self.configuration else {}
             )
             self.shapes[id_] = Shape.from_structure(
@@ -326,7 +326,7 @@ class ShapeSpecification:
         self,
         svg,
         point: np.array,
-        tags: Dict[str, Any] = None,
+        tags: dict[str, Any] = None,
         outline: bool = False,
     ) -> None:
         """
@@ -351,7 +351,7 @@ class ShapeSpecification:
             bright: bool = is_bright(self.color)
             color: Color = Color("black") if bright else Color("white")
 
-            style: Dict[str, Any] = {
+            style: dict[str, Any] = {
                 "fill": color.hex,
                 "stroke": color.hex,
                 "stroke-width": 2.2,
@@ -381,15 +381,15 @@ class Icon:
     Icon that consists of (probably) multiple shapes.
     """
 
-    shape_specifications: List[ShapeSpecification]
+    shape_specifications: list[ShapeSpecification]
 
-    def get_shape_ids(self) -> List[str]:
+    def get_shape_ids(self) -> list[str]:
         """
         Get all shape identifiers in the icon.
         """
         return [x.shape.id_ for x in self.shape_specifications]
 
-    def get_names(self) -> List[str]:
+    def get_names(self) -> list[str]:
         """
         Gat all shape names in the icon.
         """
@@ -402,7 +402,7 @@ class Icon:
         self,
         svg: svgwrite.Drawing,
         point: np.array,
-        tags: Dict[str, Any] = None,
+        tags: dict[str, Any] = None,
         outline: bool = False,
     ) -> None:
         """
@@ -469,7 +469,7 @@ class Icon:
                 shape_specification.color = color
 
     def add_specifications(
-        self, specifications: List[ShapeSpecification]
+        self, specifications: list[ShapeSpecification]
     ) -> None:
         """
         Add shape specifications to the icon.
@@ -494,8 +494,8 @@ class IconSet:
     """
 
     main_icon: Icon
-    extra_icons: List[Icon]
+    extra_icons: list[Icon]
 
     # Tag keys that were processed to create icon set (other tag keys should be
     # displayed by text or ignored)
-    processed: Set[str]
+    processed: set[str]
diff --git a/roentgen/mapcss.py b/roentgen/mapcss.py
index ca11f98..712b5a9 100644
--- a/roentgen/mapcss.py
+++ b/roentgen/mapcss.py
@@ -3,7 +3,7 @@ MapCSS scheme creation.
 """
 import logging
 from pathlib import Path
-from typing import Dict, List, Optional, TextIO
+from typing import Optional, TextIO
 
 from colour import Color
 
@@ -83,8 +83,8 @@ class MapCSSWriter:
         self.add_icons_for_lifecycle: bool = add_icons_for_lifecycle
         self.icon_directory_name: str = icon_directory_name
 
-        self.point_matchers: List[Matcher] = scheme.node_matchers
-        self.line_matchers: List[Matcher] = scheme.way_matchers
+        self.point_matchers: list[Matcher] = scheme.node_matchers
+        self.line_matchers: list[Matcher] = scheme.way_matchers
 
     def add_selector(
         self,
@@ -102,7 +102,7 @@ class MapCSSWriter:
         :param opacity: icon opacity
         :return:
         """
-        elements: Dict[str, str] = {}
+        elements: dict[str, str] = {}
 
         clean_shapes = matcher.get_clean_shapes()
         if clean_shapes:
diff --git a/roentgen/mapper.py b/roentgen/mapper.py
index 7f5cc76..5c6a995 100644
--- a/roentgen/mapper.py
+++ b/roentgen/mapper.py
@@ -1,7 +1,7 @@
 """
 Simple OpenStreetMap renderer.
 """
-from typing import Any, Dict, Iterator, Set
+from typing import Any, Iterator
 
 import numpy as np
 import svgwrite
@@ -12,33 +12,27 @@ from svgwrite.shapes import Rect
 
 from roentgen import ui
 from roentgen.constructor import Constructor
-from roentgen.direction import DirectionSet, Sector
 from roentgen.figure import Road
 from roentgen.flinger import Flinger
-from roentgen.icon import ShapeExtractor
-from roentgen.osm_reader import Map, OSMNode
+from roentgen.osm_reader import OSMNode
 from roentgen.point import Occupied
 from roentgen.road import Intersection, RoadPart
 from roentgen.scheme import Scheme
+from roentgen.ui import AUTHOR_MODE, TIME_MODE
 
 __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"
 
-AUTHOR_MODE = "user-coloring"
-CREATION_TIME_MODE = "time"
 
-
-class Painter:
+class Map:
     """
     Map drawing.
     """
 
     def __init__(
         self,
-        map_: Map,
         flinger: Flinger,
         svg: svgwrite.Drawing,
-        icon_extractor: ShapeExtractor,
         scheme: Scheme,
         overlap: int = 12,
         mode: str = "normal",
@@ -48,20 +42,16 @@ class Painter:
         self.mode: str = mode
         self.label_mode: str = label_mode
 
-        self.map_: Map = map_
         self.flinger: Flinger = flinger
         self.svg: svgwrite.Drawing = svg
-        self.icon_extractor = icon_extractor
         self.scheme: Scheme = scheme
 
         self.background_color: Color = self.scheme.get_color("background_color")
-        if self.mode in [AUTHOR_MODE, CREATION_TIME_MODE]:
+        if self.mode in [AUTHOR_MODE, TIME_MODE]:
             self.background_color: Color = Color("#111111")
 
     def draw(self, constructor: Constructor) -> None:
-        """
-        Draw map.
-        """
+        """Draw map."""
         self.svg.add(
             Rect((0, 0), self.flinger.size, fill=self.background_color)
         )
@@ -84,9 +74,13 @@ class Painter:
         for road in roads:
             self.draw_road(road, road.matcher.color)
 
-        self.draw_trees(constructor)
+        for tree in constructor.trees:
+            tree.draw(self.svg, self.flinger, self.scheme)
+
+        for direction_sector in constructor.direction_sectors:
+            direction_sector.draw(self.svg, self.scheme)
+
         self.draw_buildings(constructor)
-        self.draw_direction(constructor)
 
         # All other points
 
@@ -101,10 +95,6 @@ class Painter:
         steps: int = len(nodes)
 
         for index, node in enumerate(nodes):
-            if node.get_tag("natural") == "tree" and (
-                "diameter_crown" in node.tags or "circumference" in node.tags
-            ):
-                continue
             ui.progress_bar(
                 index, steps * 3, step=10, text="Drawing main icons"
             )
@@ -121,207 +111,39 @@ class Painter:
                 steps * 2 + index, steps * 3, step=10, text="Drawing texts"
             )
             if (
-                self.mode not in [CREATION_TIME_MODE, AUTHOR_MODE]
+                self.mode not in [TIME_MODE, AUTHOR_MODE]
                 and self.label_mode != "no"
             ):
                 point.draw_texts(self.svg, occupied, self.label_mode)
 
         ui.progress_bar(-1, len(nodes), step=10, text="Drawing nodes")
 
-    def draw_trees(self, constructor) -> None:
-        """
-        Draw trunk and circumference.
-        """
-        for node in constructor.points:
-            if not (
-                node.get_tag("natural") == "tree"
-                and (
-                    "diameter_crown" in node.tags
-                    or "circumference" in node.tags
-                )
-            ):
-                continue
-
-            scale: float = self.flinger.get_scale(node.coordinates)
-
-            if "circumference" in node.tags:
-                if "diameter_crown" in node.tags:
-                    opacity = 0.7
-                    radius = float(node.tags["diameter_crown"]) / 2
-                else:
-                    opacity = 0.3
-                    radius = 2
-                self.svg.add(
-                    self.svg.circle(
-                        node.point,
-                        radius * scale,
-                        fill=self.scheme.get_color("evergreen_color"),
-                        opacity=opacity,
-                    )
-                )
-                radius = float(node.tags["circumference"]) / 2 / np.pi
-                self.svg.add(
-                    self.svg.circle(node.point, radius * scale, fill="#B89A74")
-                )
-
     def draw_buildings(self, constructor: Constructor) -> None:
-        """
-        Draw buildings: shade, walls, and roof.
-        """
-        # Draw shade.
-
+        """Draw buildings: shade, walls, and roof."""
         building_shade: Group = Group(opacity=0.1)
         scale: float = self.flinger.get_scale() / 3.0
         for building in constructor.buildings:
-            shift_1 = np.array((scale * building.min_height, 0))
-            shift_2 = np.array((scale * building.height, 0))
-            commands: str = building.get_path(self.flinger, shift_1)
-            path = Path(
-                d=commands, fill="#000000", stroke="#000000", stroke_width=1
-            )
-            building_shade.add(path)
-            for nodes in building.inners + building.outers:
-                for i in range(len(nodes) - 1):
-                    flung_1 = self.flinger.fling(nodes[i].coordinates)
-                    flung_2 = self.flinger.fling(nodes[i + 1].coordinates)
-                    command = (
-                        "M",
-                        np.add(flung_1, shift_1),
-                        "L",
-                        np.add(flung_2, shift_1),
-                        np.add(flung_2, shift_2),
-                        np.add(flung_1, shift_2),
-                        "Z",
-                    )
-                    path = Path(
-                        command,
-                        fill="#000000",
-                        stroke="#000000",
-                        stroke_width=1,
-                    )
-                    building_shade.add(path)
+            building.draw_shade(building_shade, self.flinger)
         self.svg.add(building_shade)
 
-        # Draw buildings.
-
         previous_height: float = 0
         count: int = len(constructor.heights)
         for index, height in enumerate(sorted(constructor.heights)):
             ui.progress_bar(index, count, step=1, text="Drawing buildings")
             fill: Color()
-            for way in constructor.buildings:
-                if way.height < height or way.min_height > height:
+            for building in constructor.buildings:
+                if building.height < height or building.min_height > height:
                     continue
-                shift_1 = [0, -previous_height * scale]
-                shift_2 = [0, -height * scale]
-                for segment in way.parts:
-                    if height == 2:
-                        fill = Color("#AAAAAA")
-                    elif height == 4:
-                        fill = Color("#C3C3C3")
-                    else:
-                        color_part: float = 0.8 + segment.angle * 0.2
-                        fill = Color(rgb=(color_part, color_part, color_part))
+                building.draw_walls(self.svg, height, previous_height, scale)
 
-                    command = (
-                        "M",
-                        segment.point_1 + shift_1,
-                        "L",
-                        segment.point_2 + shift_1,
-                        segment.point_2 + shift_2,
-                        segment.point_1 + shift_2,
-                        segment.point_1 + shift_1,
-                        "Z",
-                    )
-                    path = self.svg.path(
-                        d=command,
-                        fill=fill.hex,
-                        stroke=fill.hex,
-                        stroke_width=1,
-                        stroke_linejoin="round",
-                    )
-                    self.svg.add(path)
-
-            # Draw building roofs.
-
-            for way in constructor.buildings:
-                if way.height == height:
-                    shift = np.array([0, -way.height * scale])
-                    path_commands: str = way.get_path(self.flinger, shift)
-                    path = Path(d=path_commands, opacity=1)
-                    path.update(way.line_style.style)
-                    path.update({"stroke-linejoin": "round"})
-                    self.svg.add(path)
+            for building in constructor.buildings:
+                if building.height == height:
+                    building.draw_roof(self.svg, self.flinger, scale)
 
             previous_height = height
+
         ui.progress_bar(-1, count, step=1, text="Drawing buildings")
 
-    def draw_direction(self, constructor) -> None:
-        """
-        Draw gradient sectors for directions.
-        """
-        for node in constructor.points:
-
-            angle = None
-            is_revert_gradient: bool = False
-
-            if node.get_tag("man_made") == "surveillance":
-                direction = node.get_tag("camera:direction")
-                if "camera:angle" in node.tags:
-                    angle = float(node.get_tag("camera:angle"))
-                if "angle" in node.tags:
-                    angle = float(node.get_tag("angle"))
-                direction_radius: float = 25
-                direction_color: Color = self.scheme.get_color(
-                    "direction_camera_color"
-                )
-            elif node.get_tag("traffic_sign") == "stop":
-                direction = node.get_tag("direction")
-                direction_radius: float = 25
-                direction_color: Color = Color("red")
-            else:
-                direction = node.get_tag("direction")
-                direction_radius: float = 50
-                direction_color: Color = self.scheme.get_color(
-                    "direction_view_color"
-                )
-                is_revert_gradient = True
-
-            if not direction:
-                continue
-
-            point = (node.point.astype(int)).astype(float)
-
-            if angle:
-                paths = [Sector(direction, angle).draw(point, direction_radius)]
-            else:
-                paths = DirectionSet(direction).draw(point, direction_radius)
-
-            for path in paths:
-                radial_gradient = self.svg.radialGradient(
-                    center=point,
-                    r=direction_radius,
-                    gradientUnits="userSpaceOnUse",
-                )
-                gradient = self.svg.defs.add(radial_gradient)
-                if is_revert_gradient:
-                    (
-                        gradient
-                        .add_stop_color(0, direction_color.hex, opacity=0)
-                        .add_stop_color(1, direction_color.hex, opacity=0.7)
-                    )  # fmt: skip
-                else:
-                    (
-                        gradient
-                        .add_stop_color(0, direction_color.hex, opacity=0.4)
-                        .add_stop_color(1, direction_color.hex, opacity=0)
-                    )  # fmt: skip
-                path = self.svg.path(
-                    d=["M", point] + path + ["L", point, "Z"],
-                    fill=gradient.get_paint_server(),
-                )
-                self.svg.add(path)
-
     def draw_road(
         self, road: Road, color: Color, extra_width: float = 0
     ) -> None:
@@ -336,7 +158,7 @@ class Painter:
         scale = self.flinger.get_scale(road.outers[0][0].coordinates)
         path_commands: str = road.get_path(self.flinger)
         path = Path(d=path_commands)
-        style: Dict[str, Any] = {
+        style: dict[str, Any] = {
             "fill": "none",
             "stroke": color.hex,
             "stroke-linecap": "round",
@@ -350,7 +172,7 @@ class Painter:
         """
         Draw road as simple SVG path.
         """
-        nodes: Dict[OSMNode, Set[RoadPart]] = {}
+        nodes: dict[OSMNode, set[RoadPart]] = {}
 
         for road in roads:
             for index in range(len(road.outers[0]) - 1):
@@ -379,7 +201,7 @@ class Painter:
             intersection.draw(self.svg, scale, True)
 
 
-def check_level_number(tags: Dict[str, Any], level: float):
+def check_level_number(tags: dict[str, Any], level: float):
     """
     Check if element described by tags is no the specified level.
     """
@@ -392,7 +214,7 @@ def check_level_number(tags: Dict[str, Any], level: float):
     return True
 
 
-def check_level_overground(tags: Dict[str, Any]) -> bool:
+def check_level_overground(tags: dict[str, Any]) -> bool:
     """
     Check if element described by tags is overground.
     """
diff --git a/roentgen/moire_manager.py b/roentgen/moire_manager.py
index a9924a6..f38e5f3 100644
--- a/roentgen/moire_manager.py
+++ b/roentgen/moire_manager.py
@@ -4,7 +4,7 @@ Moire markup extension for Röntgen.
 import argparse
 from abc import ABC
 from pathlib import Path
-from typing import Any, Dict, List, Union
+from typing import Any, Union
 
 import yaml
 from moire.default import Default, DefaultHTML, DefaultMarkdown, DefaultWiki
@@ -17,8 +17,8 @@ from roentgen.workspace import workspace
 __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"
 
-Arguments = List[Any]
-Code = Union[str, Tag, List]
+Arguments = list[Any]
+Code = Union[str, Tag, list]
 
 PREFIX: str = "https://wiki.openstreetmap.org/wiki/"
 
@@ -29,13 +29,13 @@ class ArgumentParser(argparse.ArgumentParser):
     """
 
     def __init__(self, *args, **kwargs):
-        self.arguments: List[Dict[str, Any]] = []
+        self.arguments: list[dict[str, Any]] = []
         super(ArgumentParser, self).__init__(*args, **kwargs)
 
     def add_argument(self, *args, **kwargs) -> None:
         """Just store argument with options."""
         super(ArgumentParser, self).add_argument(*args, **kwargs)
-        argument: Dict[str, Any] = {"arguments": [x for x in args]}
+        argument: dict[str, Any] = {"arguments": [x for x in args]}
 
         for key in kwargs:
             argument[key] = kwargs[key]
@@ -57,7 +57,7 @@ class ArgumentParser(argparse.ArgumentParser):
             row: Code = [[x for y in array for x in y][:-1]]
 
             if "help" in option:
-                help_value: List = [option["help"]]
+                help_value: list = [option["help"]]
                 if (
                     "default" in option
                     and option["default"]
@@ -91,13 +91,13 @@ class TestConfiguration:
     """
 
     def __init__(self, test_config: Path):
-        self.steps: Dict[str, Any] = {}
+        self.steps: dict[str, Any] = {}
 
         with test_config.open() as input_file:
-            content: Dict[str, Any] = yaml.load(
+            content: dict[str, Any] = yaml.load(
                 input_file, Loader=yaml.FullLoader
             )
-            steps: List[Dict[str, Any]] = content["jobs"]["build"]["steps"]
+            steps: list[dict[str, Any]] = content["jobs"]["build"]["steps"]
             for step in steps:
                 if "name" not in step:
                     continue
@@ -177,7 +177,8 @@ class RoentgenHTML(RoentgenMoire, DefaultHTML):
     Simple HTML.
     """
 
-    images = {}
+    def __init__(self):
+        self.images: dict = {}
 
     def color(self, args: Arguments) -> str:
         """Simple color sample."""
@@ -202,10 +203,11 @@ class RoentgenOSMWiki(RoentgenMoire, DefaultWiki):
     See https://wiki.openstreetmap.org/wiki/Main_Page
     """
 
-    images = {}
-    extractor = ShapeExtractor(
-        workspace.ICONS_PATH, workspace.ICONS_CONFIG_PATH
-    )
+    def __init__(self):
+        self.images: dict = {}
+        self.extractor: ShapeExtractor = ShapeExtractor(
+            workspace.ICONS_PATH, workspace.ICONS_CONFIG_PATH
+        )
 
     def osm(self, args: Arguments) -> str:
         """OSM tag key or key–value pair of tag."""
diff --git a/roentgen/osm_getter.py b/roentgen/osm_getter.py
index 8e79d98..955839d 100644
--- a/roentgen/osm_getter.py
+++ b/roentgen/osm_getter.py
@@ -4,8 +4,8 @@ Getting OpenStreetMap data from the web.
 import logging
 import time
 import urllib
+from dataclasses import dataclass
 from pathlib import Path
-from typing import Dict, Optional
 
 import urllib3
 
@@ -14,44 +14,44 @@ from roentgen.ui import BoundaryBox
 __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"
 
+SLEEP_TIME_BETWEEN_REQUESTS: float = 2.0
 
+
+@dataclass
 class NetworkError(Exception):
     """Failed network request."""
 
-    def __init__(self, message: str):
-        super().__init__()
-        self.message: str = message
+    message: str
 
 
 def get_osm(
-    boundary_box: BoundaryBox, cache_path: Path, to_update: bool = False
+    boundary_box: BoundaryBox, cache_file_path: Path, to_update: bool = False
 ) -> str:
     """
     Download OSM data from the web or get if from the cache.
 
     :param boundary_box: borders of the map part to download
-    :param cache_path: cache directory to store downloaded OSM files
+    :param cache_file_path: cache file to store downloaded OSM data
     :param to_update: update cache files
     """
-    result_file_name: Path = cache_path / f"{boundary_box.get_format()}.osm"
+    if not to_update and cache_file_path.is_file():
+        with cache_file_path.open() as output_file:
+            return output_file.read()
 
-    if not to_update and result_file_name.is_file():
-        return result_file_name.open().read()
-
-    content: Optional[str] = get_data(
+    content: str = get_data(
         "api.openstreetmap.org/api/0.6/map",
         {"bbox": boundary_box.get_format()},
         is_secure=True,
     ).decode("utf-8")
 
-    with result_file_name.open("w+") as output_file:
+    with cache_file_path.open("w+") as output_file:
         output_file.write(content)
 
     return content
 
 
 def get_data(
-    address: str, parameters: Dict[str, str], is_secure: bool = False
+    address: str, parameters: dict[str, str], is_secure: bool = False
 ) -> bytes:
     """
     Construct Internet page URL and get its descriptor.
@@ -61,7 +61,7 @@ def get_data(
     :param is_secure: https or http
     :return: connection descriptor
     """
-    url: str = "http" + ("s" if is_secure else "") + "://" + address
+    url: str = f"http{('s' if is_secure else '')}://{address}"
     if len(parameters) > 0:
         url += f"?{urllib.parse.urlencode(parameters)}"
     logging.info(f"Getting {url}...")
@@ -74,5 +74,5 @@ def get_data(
         raise NetworkError("Cannot download data: too many attempts.")
 
     pool_manager.clear()
-    time.sleep(2)
+    time.sleep(SLEEP_TIME_BETWEEN_REQUESTS)
     return result.data
diff --git a/roentgen/osm_reader.py b/roentgen/osm_reader.py
index eb0ee13..8d10904 100644
--- a/roentgen/osm_reader.py
+++ b/roentgen/osm_reader.py
@@ -6,7 +6,7 @@ import re
 from dataclasses import dataclass
 from datetime import datetime
 from pathlib import Path
-from typing import Any, Dict, List, Optional, Set
+from typing import Any, Optional
 from xml.etree import ElementTree
 
 import numpy as np
@@ -23,7 +23,8 @@ KILOMETERS_PATTERN = re.compile("^(?P<value>\\d*\\.?\\d*)\\s*km$")
 MILES_PATTERN = re.compile("^(?P<value>\\d*\\.?\\d*)\\s*mi$")
 
 
-STAGES_OF_DECAY: List[str] = [
+# See https://wiki.openstreetmap.org/wiki/Lifecycle_prefix#Stages_of_decay
+STAGES_OF_DECAY: list[str] = [
     "disused",
     "abandoned",
     "ruins",
@@ -50,8 +51,9 @@ class Tagged:
     OpenStreetMap element (node, way or relation) with tags.
     """
 
-    def __init__(self):
-        self.tags: Dict[str, str] = {}
+    def __init__(self, tags: dict[str, str] = None):
+        self.tags: dict[str, str]
+        self.tags = {} if tags is None else tags
 
     def get_tag(self, key: str) -> Optional[str]:
         """
@@ -139,7 +141,7 @@ class OSMNode(Tagged):
                 node.tags[subattributes["k"]] = subattributes["v"]
         return node
 
-    def parse_from_structure(self, structure: Dict[str, Any]) -> "OSMNode":
+    def parse_from_structure(self, structure: dict[str, Any]) -> "OSMNode":
         """
         Parse node from Overpass-like structure.
 
@@ -160,11 +162,11 @@ class OSMWay(Tagged):
     See https://wiki.openstreetmap.org/wiki/Way
     """
 
-    def __init__(self, id_: int = 0, nodes: Optional[List[OSMNode]] = None):
+    def __init__(self, id_: int = 0, nodes: Optional[list[OSMNode]] = None):
         super().__init__()
 
         self.id_: int = id_
-        self.nodes: List[OSMNode] = [] if nodes is None else nodes
+        self.nodes: list[OSMNode] = [] if nodes is None else nodes
 
         self.visible: Optional[str] = None
         self.changeset: Optional[str] = None
@@ -194,7 +196,7 @@ class OSMWay(Tagged):
         return way
 
     def parse_from_structure(
-        self, structure: Dict[str, Any], nodes
+        self, structure: dict[str, Any], nodes
     ) -> "OSMWay":
         """
         Parse way from Overpass-like structure.
@@ -245,7 +247,7 @@ class OSMRelation(Tagged):
         super().__init__()
 
         self.id_: int = id_
-        self.members: List["OSMMember"] = []
+        self.members: list["OSMMember"] = []
         self.user: Optional[str] = None
         self.timestamp: Optional[datetime] = None
 
@@ -275,7 +277,7 @@ class OSMRelation(Tagged):
                 relation.tags[subelement.attrib["k"]] = subelement.attrib["v"]
         return relation
 
-    def parse_from_structure(self, structure: Dict[str, Any]) -> "OSMRelation":
+    def parse_from_structure(self, structure: dict[str, Any]) -> "OSMRelation":
         """
         Parse relation from Overpass-like structure.
 
@@ -305,19 +307,19 @@ class OSMMember:
     role: str = ""
 
 
-class Map:
+class OSMData:
     """
     The whole OpenStreetMap information about nodes, ways, and relations.
     """
 
     def __init__(self):
-        self.nodes: Dict[int, OSMNode] = {}
-        self.ways: Dict[int, OSMWay] = {}
-        self.relations: Dict[int, OSMRelation] = {}
+        self.nodes: dict[int, OSMNode] = {}
+        self.ways: dict[int, OSMWay] = {}
+        self.relations: dict[int, OSMRelation] = {}
 
-        self.authors: Set[str] = set()
+        self.authors: set[str] = set()
         self.time: MinMax = MinMax()
-        self.boundary_box: List[MinMax] = [MinMax(), MinMax()]
+        self.boundary_box: list[MinMax] = [MinMax(), MinMax()]
         self.view_box = None
 
     def add_node(self, node: OSMNode) -> None:
@@ -355,9 +357,9 @@ class OverpassReader:
     """
 
     def __init__(self):
-        self.map_ = Map()
+        self.osm_data = OSMData()
 
-    def parse_json_file(self, file_name: Path) -> Map:
+    def parse_json_file(self, file_name: Path) -> OSMData:
         """
         Parse JSON structure from the file and construct map.
         """
@@ -371,18 +373,18 @@ class OverpassReader:
             if element["type"] == "node":
                 node = OSMNode().parse_from_structure(element)
                 node_map[node.id_] = node
-                self.map_.add_node(node)
+                self.osm_data.add_node(node)
         for element in structure["elements"]:
             if element["type"] == "way":
                 way = OSMWay().parse_from_structure(element, node_map)
                 way_map[way.id_] = way
-                self.map_.add_way(way)
+                self.osm_data.add_way(way)
         for element in structure["elements"]:
             if element["type"] == "relation":
                 relation = OSMRelation().parse_from_structure(element)
-                self.map_.add_relation(relation)
+                self.osm_data.add_relation(relation)
 
-        return self.map_
+        return self.osm_data
 
 
 class OSMReader:
@@ -406,13 +408,13 @@ class OSMReader:
         :param is_full: whether metadata should be parsed: tags `visible`,
             `changeset`, `timestamp`, `user`, `uid`
         """
-        self.map_ = Map()
+        self.osm_data = OSMData()
         self.parse_nodes: bool = parse_nodes
         self.parse_ways: bool = parse_ways
         self.parse_relations: bool = parse_relations
         self.is_full: bool = is_full
 
-    def parse_osm_file(self, file_name: Path) -> Map:
+    def parse_osm_file(self, file_name: Path) -> OSMData:
         """
         Parse OSM XML file.
 
@@ -421,7 +423,7 @@ class OSMReader:
         """
         return self.parse_osm(ElementTree.parse(file_name).getroot())
 
-    def parse_osm_text(self, text: str) -> Map:
+    def parse_osm_text(self, text: str) -> OSMData:
         """
         Parse OSM XML data from text representation.
 
@@ -430,7 +432,7 @@ class OSMReader:
         """
         return self.parse_osm(ElementTree.fromstring(text))
 
-    def parse_osm(self, root) -> Map:
+    def parse_osm(self, root) -> OSMData:
         """
         Parse OSM XML data.
 
@@ -442,25 +444,25 @@ class OSMReader:
                 self.parse_bounds(element)
             if element.tag == "node" and self.parse_nodes:
                 node = OSMNode.from_xml_structure(element, self.is_full)
-                self.map_.add_node(node)
+                self.osm_data.add_node(node)
             if element.tag == "way" and self.parse_ways:
-                self.map_.add_way(
+                self.osm_data.add_way(
                     OSMWay.from_xml_structure(
-                        element, self.map_.nodes, self.is_full
+                        element, self.osm_data.nodes, self.is_full
                     )
                 )
             if element.tag == "relation" and self.parse_relations:
-                self.map_.add_relation(
+                self.osm_data.add_relation(
                     OSMRelation.from_xml_structure(element, self.is_full)
                 )
-        return self.map_
+        return self.osm_data
 
     def parse_bounds(self, element) -> None:
         """
         Parse view box from XML element.
         """
         attributes = element.attrib
-        self.map_.view_box = MinMax(
+        self.osm_data.view_box = MinMax(
             np.array(
                 (float(attributes["minlat"]), float(attributes["minlon"]))
             ),
diff --git a/roentgen/point.py b/roentgen/point.py
index f3142d4..7477fed 100644
--- a/roentgen/point.py
+++ b/roentgen/point.py
@@ -1,7 +1,7 @@
 """
 Point: node representation on the map.
 """
-from typing import Dict, List, Optional, Set
+from typing import Optional
 
 import numpy as np
 import svgwrite
@@ -56,9 +56,9 @@ class Point(Tagged):
     def __init__(
         self,
         icon_set: IconSet,
-        labels: List[Label],
-        tags: Dict[str, str],
-        processed: Set[str],
+        labels: list[Label],
+        tags: dict[str, str],
+        processed: set[str],
         point: np.array,
         coordinates: np.array,
         priority: float = 0,
@@ -70,9 +70,9 @@ class Point(Tagged):
         assert point is not None
 
         self.icon_set: IconSet = icon_set
-        self.labels: List[Label] = labels
-        self.tags: Dict[str, str] = tags
-        self.processed: Set[str] = processed
+        self.labels: list[Label] = labels
+        self.tags: dict[str, str] = tags
+        self.processed: set[str] = processed
         self.point: np.array = point
         self.coordinates: np.array = coordinates
         self.priority: float = priority
@@ -139,7 +139,7 @@ class Point(Tagged):
         icon: Icon,
         position,
         occupied,
-        tags: Optional[Dict[str, str]] = None,
+        tags: Optional[dict[str, str]] = None,
     ) -> bool:
         """
         Draw one combined icon and its outline.
@@ -176,7 +176,7 @@ class Point(Tagged):
         """
         Draw all labels.
         """
-        labels: List[Label]
+        labels: list[Label]
 
         if label_mode == "main":
             labels = self.labels[:1]
diff --git a/roentgen/raster.py b/roentgen/raster.py
index b37f010..db16baa 100644
--- a/roentgen/raster.py
+++ b/roentgen/raster.py
@@ -5,7 +5,6 @@ import logging
 import os
 import subprocess
 from pathlib import Path
-from typing import List
 
 __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"
@@ -25,7 +24,7 @@ def rasterize(from_: Path, to_: Path, area: str = "", dpi: float = 90) -> None:
             f"Inkscape and set the variable to be able to rasterize SVG files."
         )
 
-    commands: List[str] = [os.environ[INKSCAPE_BIN]]
+    commands: list[str] = [os.environ[INKSCAPE_BIN]]
     commands += ["--export-png", to_.absolute()]
     commands += ["--export-dpi", str(dpi)]
     if area:
diff --git a/roentgen/road.py b/roentgen/road.py
index d97db04..28de82f 100644
--- a/roentgen/road.py
+++ b/roentgen/road.py
@@ -2,7 +2,7 @@
 WIP: road shape drawing.
 """
 from dataclasses import dataclass
-from typing import List, Optional
+from typing import Optional
 
 import numpy as np
 import svgwrite
@@ -48,7 +48,7 @@ class RoadPart:
         self,
         point_1: np.array,
         point_2: np.array,
-        lanes: List[Lane],
+        lanes: list[Lane],
         scale: False,
     ):
         """
@@ -58,7 +58,7 @@ class RoadPart:
         """
         self.point_1: np.array = point_1
         self.point_2: np.array = point_2
-        self.lanes: List[Lane] = lanes
+        self.lanes: list[Lane] = lanes
         if lanes:
             self.width = sum(map(lambda x: x.get_width(scale), lanes))
         else:
@@ -297,8 +297,8 @@ class Intersection:
     points of the road parts should be the same.
     """
 
-    def __init__(self, parts: List[RoadPart]):
-        self.parts: List[RoadPart] = sorted(parts, key=lambda x: x.get_angle())
+    def __init__(self, parts: list[RoadPart]):
+        self.parts: list[RoadPart] = sorted(parts, key=lambda x: x.get_angle())
 
         for index in range(len(self.parts)):
             next_index: int = 0 if index == len(self.parts) - 1 else index + 1
diff --git a/roentgen/scheme.py b/roentgen/scheme.py
index 7066826..95f2cae 100644
--- a/roentgen/scheme.py
+++ b/roentgen/scheme.py
@@ -4,7 +4,7 @@ Röntgen drawing scheme.
 from dataclasses import dataclass
 from enum import Enum
 from pathlib import Path
-from typing import Any, Dict, List, Optional, Set, Tuple, Union
+from typing import Any, Optional, Tuple, Union
 
 import yaml
 from colour import Color
@@ -30,7 +30,7 @@ class LineStyle:
     SVG line style and its priority.
     """
 
-    style: Dict[str, Union[int, float, str]]
+    style: dict[str, Union[int, float, str]]
     priority: float = 0.0
 
 
@@ -48,7 +48,7 @@ class MatchingType(Enum):
 def is_matched_tag(
     matcher_tag_key: str,
     matcher_tag_value: Union[str, list],
-    tags: Dict[str, str],
+    tags: dict[str, str],
 ) -> MatchingType:
     """
     Check whether element tags contradict tag matcher.
@@ -89,10 +89,10 @@ class Matcher:
     Tag matching.
     """
 
-    def __init__(self, structure: Dict[str, Any]):
-        self.tags: Dict[str, str] = structure["tags"]
+    def __init__(self, structure: dict[str, Any]):
+        self.tags: dict[str, str] = structure["tags"]
 
-        self.exception: Dict[str, str] = {}
+        self.exception: dict[str, str] = {}
         if "exception" in structure:
             self.exception = structure["exception"]
 
@@ -100,11 +100,11 @@ class Matcher:
         if "replace_shapes" in structure:
             self.replace_shapes = structure["replace_shapes"]
 
-        self.location_restrictions: Dict[str, str] = {}
+        self.location_restrictions: dict[str, str] = {}
         if "location_restrictions" in structure:
             self.location_restrictions = structure["location_restrictions"]
 
-    def is_matched(self, tags: Dict[str, str]) -> bool:
+    def is_matched(self, tags: dict[str, str]) -> bool:
         """
         Check whether element tags matches tag matcher.
 
@@ -157,7 +157,7 @@ class NodeMatcher(Matcher):
     Tag specification matcher.
     """
 
-    def __init__(self, structure: Dict[str, Any]):
+    def __init__(self, structure: dict[str, Any]):
         # Dictionary with tag keys and values, value lists, or "*"
         super().__init__(structure)
 
@@ -200,11 +200,11 @@ class WayMatcher(Matcher):
     Special tag matcher for ways.
     """
 
-    def __init__(self, structure: Dict[str, Any], scheme: "Scheme"):
+    def __init__(self, structure: dict[str, Any], scheme: "Scheme"):
         super().__init__(structure)
-        self.style: Dict[str, Any] = {"fill": "none"}
+        self.style: dict[str, Any] = {"fill": "none"}
         if "style" in structure:
-            style: Dict[str, Any] = structure["style"]
+            style: dict[str, Any] = structure["style"]
             for key in style:
                 if str(style[key]).endswith("_color"):
                     self.style[key] = scheme.get_color(style[key]).hex.upper()
@@ -223,7 +223,7 @@ class RoadMatcher(Matcher):
     Special tag matcher for highways.
     """
 
-    def __init__(self, structure: Dict[str, Any], scheme: "Scheme"):
+    def __init__(self, structure: dict[str, Any], scheme: "Scheme"):
         super().__init__(structure)
         self.border_color: Color = Color(
             scheme.get_color(structure["border_color"])
@@ -250,33 +250,33 @@ class Scheme:
             specification
         """
         with file_name.open() as input_file:
-            content: Dict[str, Any] = yaml.load(
+            content: dict[str, Any] = yaml.load(
                 input_file.read(), Loader=yaml.FullLoader
             )
-        self.node_matchers: List[NodeMatcher] = []
+        self.node_matchers: list[NodeMatcher] = []
         for group in content["node_icons"]:
             for element in group["tags"]:
                 self.node_matchers.append(NodeMatcher(element))
 
-        self.colors: Dict[str, str] = content["colors"]
-        self.material_colors: Dict[str, str] = content["material_colors"]
+        self.colors: dict[str, str] = content["colors"]
+        self.material_colors: dict[str, str] = content["material_colors"]
 
-        self.way_matchers: List[WayMatcher] = [
+        self.way_matchers: list[WayMatcher] = [
             WayMatcher(x, self) for x in content["ways"]
         ]
-        self.road_matchers: List[RoadMatcher] = [
+        self.road_matchers: list[RoadMatcher] = [
             RoadMatcher(x, self) for x in content["roads"]
         ]
-        self.area_matchers: List[Matcher] = [
+        self.area_matchers: list[Matcher] = [
             Matcher(x) for x in content["area_tags"]
         ]
-        self.tags_to_write: List[str] = content["tags_to_write"]
-        self.prefix_to_write: List[str] = content["prefix_to_write"]
-        self.tags_to_skip: List[str] = content["tags_to_skip"]
-        self.prefix_to_skip: List[str] = content["prefix_to_skip"]
+        self.tags_to_write: list[str] = content["tags_to_write"]
+        self.prefix_to_write: list[str] = content["prefix_to_write"]
+        self.tags_to_skip: list[str] = content["tags_to_skip"]
+        self.prefix_to_skip: list[str] = content["prefix_to_skip"]
 
         # Storage for created icon sets.
-        self.cache: Dict[str, Tuple[IconSet, int]] = {}
+        self.cache: dict[str, Tuple[IconSet, int]] = {}
 
     def get_color(self, color: str) -> Color:
         """
@@ -327,8 +327,8 @@ class Scheme:
     def get_icon(
         self,
         extractor: ShapeExtractor,
-        tags: Dict[str, Any],
-        processed: Set[str],
+        tags: dict[str, Any],
+        processed: set[str],
         for_: str = "node",
     ) -> Tuple[IconSet, int]:
         """
@@ -347,7 +347,7 @@ class Scheme:
             return self.cache[tags_hash]
 
         main_icon: Optional[Icon] = None
-        extra_icons: List[Icon] = []
+        extra_icons: list[Icon] = []
         priority: int = 0
 
         index: int = 0
@@ -358,7 +358,7 @@ class Scheme:
             matched: bool = matcher.is_matched(tags)
             if not matched:
                 continue
-            matcher_tags: Set[str] = set(matcher.tags.keys())
+            matcher_tags: set[str] = set(matcher.tags.keys())
             priority = len(self.node_matchers) - index
             if not matcher.draw:
                 processed |= matcher_tags
@@ -437,7 +437,7 @@ class Scheme:
 
         return returned, priority
 
-    def get_style(self, tags: Dict[str, Any], scale):
+    def get_style(self, tags: dict[str, Any], scale):
         """
         Get line style based on tags and scale.
         """
@@ -451,7 +451,7 @@ class Scheme:
 
         return line_styles
 
-    def get_road(self, tags: Dict[str, Any]) -> Optional[RoadMatcher]:
+    def get_road(self, tags: dict[str, Any]) -> Optional[RoadMatcher]:
         for matcher in self.road_matchers:
             if not matcher.is_matched(tags):
                 continue
@@ -459,12 +459,12 @@ class Scheme:
         return None
 
     def construct_text(
-        self, tags: Dict[str, str], draw_captions: str, processed: Set[str]
-    ) -> List[Label]:
+        self, tags: dict[str, str], draw_captions: str, processed: set[str]
+    ) -> list[Label]:
         """
         Construct labels for not processed tags.
         """
-        texts: List[Label] = []
+        texts: list[Label] = []
 
         name = None
         alt_name = None
@@ -490,7 +490,7 @@ class Scheme:
                 alt_name = ""
             alt_name += "ex " + tags["old_name"]
 
-        address: List[str] = get_address(tags, draw_captions, processed)
+        address: list[str] = get_address(tags, draw_captions, processed)
 
         if name:
             texts.append(Label(name, Color("black")))
@@ -535,7 +535,7 @@ class Scheme:
                 texts.append(Label(tags[tag]))
         return texts
 
-    def is_area(self, tags: Dict[str, str]) -> bool:
+    def is_area(self, tags: dict[str, str]) -> bool:
         """
         Check whether way described by tags is area.
         """
@@ -545,7 +545,7 @@ class Scheme:
         return False
 
     def process_ignored(
-        self, tags: Dict[str, str], processed: Set[str]
+        self, tags: dict[str, str], processed: set[str]
     ) -> None:
         """
         Mark all ignored tag as processed.
@@ -553,6 +553,4 @@ class Scheme:
         :param tags: input tag dictionary
         :param processed: processed set
         """
-        for tag in tags:
-            if self.is_no_drawable(tag):
-                processed.add(tag)
+        [processed.add(tag) for tag in tags if self.is_no_drawable(tag)]
diff --git a/roentgen/server.py b/roentgen/server.py
index c79bd25..d2cdc43 100644
--- a/roentgen/server.py
+++ b/roentgen/server.py
@@ -12,26 +12,23 @@ __email__ = "me@enzet.ru"
 
 
 class Handler(BaseHTTPRequestHandler):
-
-    update_cache: bool = False
+    """
+    HTTP request handler that process sloppy map tile requests.
+    """
 
     def __init__(self, request, client_address, server):
         super().__init__(request, client_address, server)
         self.cache: Path = Path("cache")
+        self.update_cache: bool = False
 
-    def write(self, message):
-        if isinstance(message, bytes):
-            self.wfile.write(message)
-        else:
-            self.wfile.write(message.encode("utf-8"))
-
-    def do_GET(self):
-        parts = self.path.split("/")
+    def do_GET(self) -> None:
+        """Serve a GET request."""
+        parts: list[str] = self.path.split("/")
         if not (len(parts) == 5 and not parts[0] and parts[1] == "tiles"):
             return
-        zoom = int(parts[2])
-        x = int(parts[3])
-        y = int(parts[4])
+        zoom: int = int(parts[2])
+        x: int = int(parts[3])
+        y: int = int(parts[4])
         tile_path: Path = workspace.get_tile_path()
         png_path = tile_path / f"tile_{zoom}_{x}_{y}.png"
         if self.update_cache:
@@ -48,7 +45,7 @@ class Handler(BaseHTTPRequestHandler):
                 self.send_response(200)
                 self.send_header("Content-type", "image/png")
                 self.end_headers()
-                self.write(input_file.read())
+                self.wfile.write(input_file.read())
                 return
 
 
@@ -56,7 +53,7 @@ def ui(options):
     server: Optional[HTTPServer] = None
     try:
         port: int = 8080
-        server = HTTPServer(("", port), Handler)
+        server: HTTPServer = HTTPServer(("", port), Handler)
         server.cache_path = Path(options.cache)
         server.serve_forever()
         logging.info(f"Server started on port {port}.")
diff --git a/roentgen/taginfo.py b/roentgen/taginfo.py
index 3a999a7..e694191 100644
--- a/roentgen/taginfo.py
+++ b/roentgen/taginfo.py
@@ -7,7 +7,6 @@ import json
 import logging
 from datetime import datetime
 from pathlib import Path
-from typing import List
 
 from roentgen import (
     __author__,
@@ -55,7 +54,7 @@ class TaginfoProjectFile:
             ):
                 key: str = list(matcher.tags.keys())[0]
                 value: str = matcher.tags[key]
-                ids: List[str] = [
+                ids: list[str] = [
                     (x if isinstance(x, str) else x["shape"])
                     for x in matcher.shapes
                 ]
diff --git a/roentgen/text.py b/roentgen/text.py
index b874f8c..0d78fc2 100644
--- a/roentgen/text.py
+++ b/roentgen/text.py
@@ -2,7 +2,7 @@
 OSM address tag processing.
 """
 from dataclasses import dataclass
-from typing import Any, Dict, List, Set
+from typing import Any
 
 from colour import Color
 
@@ -24,15 +24,15 @@ class Label:
 
 
 def get_address(
-    tags: Dict[str, Any], draw_captions_mode: str, processed: Set[str]
-) -> List[str]:
+    tags: dict[str, Any], draw_captions_mode: str, processed: set[str]
+) -> list[str]:
     """
     Construct address text list from the tags.
 
     :param tags: OSM node, way or relation tags
     :param draw_captions_mode: captions mode ("all", "main", or "no")
     """
-    address: List[str] = []
+    address: list[str] = []
 
     if draw_captions_mode == "address":
         if "addr:postcode" in tags:
@@ -80,12 +80,12 @@ def format_frequency(value: str) -> str:
     return f"{value} "
 
 
-def get_text(tags: Dict[str, Any], processed: Set[str]) -> List[Label]:
+def get_text(tags: dict[str, Any], processed: set[str]) -> list[Label]:
     """
     Get text representation of writable tags.
     """
-    texts: List[Label] = []
-    values: List[str] = []
+    texts: list[Label] = []
+    values: list[str] = []
 
     if "voltage:primary" in tags:
         values.append(tags["voltage:primary"])
diff --git a/roentgen/tile.py b/roentgen/tile.py
index f41c559..a79820d 100644
--- a/roentgen/tile.py
+++ b/roentgen/tile.py
@@ -7,7 +7,7 @@ import logging
 import sys
 from dataclasses import dataclass
 from pathlib import Path
-from typing import List, Optional, Tuple
+from typing import Optional, Tuple
 
 import numpy as np
 import svgwrite
@@ -15,9 +15,9 @@ import svgwrite
 from roentgen.constructor import Constructor
 from roentgen.flinger import Flinger
 from roentgen.icon import ShapeExtractor
-from roentgen.mapper import Painter
+from roentgen.mapper import Map
 from roentgen.osm_getter import NetworkError, get_osm
-from roentgen.osm_reader import Map, OSMReader
+from roentgen.osm_reader import OSMData, OSMReader
 from roentgen.raster import rasterize
 from roentgen.scheme import Scheme
 from roentgen.ui import BoundaryBox
@@ -34,7 +34,7 @@ class Tiles:
     Collection of tiles.
     """
 
-    tiles: List["Tile"]
+    tiles: list["Tile"]
     tile_1: "Tile"
     tile_2: "Tile"
     scale: int
@@ -43,7 +43,7 @@ class Tiles:
     @classmethod
     def from_boundary_box(cls, boundary_box: BoundaryBox, scale: int):
         """Create minimal set of tiles that cover boundary box."""
-        tiles: List["Tile"] = []
+        tiles: list["Tile"] = []
         tile_1 = Tile.from_coordinates(boundary_box.get_left_top(), scale)
         tile_2 = Tile.from_coordinates(boundary_box.get_right_bottom(), scale)
 
@@ -69,15 +69,16 @@ class Tiles:
         :param directory: directory for tiles
         :param cache_path: directory for temporary OSM files
         """
-        get_osm(self.boundary_box, cache_path)
-
-        map_ = OSMReader().parse_osm_file(
-            cache_path / (self.boundary_box.get_format() + ".osm")
+        cache_file_path: Path = (
+            cache_path / f"{self.boundary_box.get_format()}.osm"
         )
+        get_osm(self.boundary_box, cache_file_path)
+
+        osm_data: OSMData = OSMReader().parse_osm_file(cache_file_path)
         for tile in self.tiles:
             file_path: Path = tile.get_file_name(directory)
             if not file_path.exists():
-                tile.draw_for_map(map_, directory)
+                tile.draw_for_map(osm_data, directory)
             else:
                 logging.info(f"File {file_path} already exists.")
 
@@ -97,14 +98,12 @@ class Tiles:
             self.boundary_box.get_format() + ".svg"
         )
         if not output_path.exists():
-            content = get_osm(self.boundary_box, cache_path)
-            if not content:
-                logging.error("Cannot download OSM data.")
-                return None
-
-            map_: Map = OSMReader().parse_osm_file(
-                cache_path / (self.boundary_box.get_format() + ".osm")
+            cache_file_path: Path = (
+                cache_path / f"{self.boundary_box.get_format()}.osm"
             )
+            get_osm(self.boundary_box, cache_file_path)
+
+            osm_data: OSMData = OSMReader().parse_osm_file(cache_file_path)
             lat_2, lon_1 = self.tile_1.get_coordinates()
             lat_1, lon_2 = Tile(
                 self.tile_2.x + 1, self.tile_2.y + 1, self.scale
@@ -113,26 +112,20 @@ class Tiles:
             max_ = np.array((lat_2, lon_2))
 
             flinger: Flinger = Flinger(MinMax(min_, max_), self.scale)
-            icon_extractor: ShapeExtractor = ShapeExtractor(
+            extractor: ShapeExtractor = ShapeExtractor(
                 workspace.ICONS_PATH, workspace.ICONS_CONFIG_PATH
             )
             scheme: Scheme = Scheme(workspace.DEFAULT_SCHEME_PATH)
             constructor: Constructor = Constructor(
-                map_, flinger, scheme, icon_extractor
+                osm_data, flinger, scheme, extractor
             )
             constructor.construct()
 
             svg: svgwrite.Drawing = svgwrite.Drawing(
                 str(output_path), size=flinger.size
             )
-            painter: Painter = Painter(
-                map_=map_,
-                flinger=flinger,
-                svg=svg,
-                icon_extractor=icon_extractor,
-                scheme=scheme,
-            )
-            painter.draw(constructor)
+            map_: Map = Map(flinger=flinger, svg=svg, scheme=scheme)
+            map_.draw(constructor)
 
             logging.info(f"Writing output SVG {output_path}...")
             with output_path.open("w+") as output_file:
@@ -204,18 +197,18 @@ class Tile:
             point_1[1], point_2[0], point_2[1], point_1[0]
         ).round()
 
-    def load_map(self, cache_path: Path) -> Map:
+    def load_osm_data(self, cache_path: Path) -> OSMData:
         """
         Construct map data from extended boundary box.
 
         :param cache_path: directory to store OSM data files
         """
-        boundary_box: BoundaryBox = self.get_extended_boundary_box()
-        get_osm(boundary_box, cache_path)
-
-        return OSMReader().parse_osm_file(
-            cache_path / f"{boundary_box.get_format()}.osm"
+        cache_file_path: Path = (
+            cache_path / f"{self.get_extended_boundary_box().get_format()}.osm"
         )
+        get_osm(self.get_extended_boundary_box(), cache_file_path)
+
+        return OSMReader().parse_osm_file(cache_file_path)
 
     def get_file_name(self, directory_name: Path) -> Path:
         """
@@ -239,13 +232,13 @@ class Tile:
         :param cache_path: directory to store SVG and PNG tiles
         """
         try:
-            map_: Map = self.load_map(cache_path)
+            osm_data: OSMData = self.load_osm_data(cache_path)
         except NetworkError as e:
             raise NetworkError(f"Map does not loaded. {e.message}")
 
-        self.draw_for_map(map_, directory_name)
+        self.draw_for_map(osm_data, directory_name)
 
-    def draw_for_map(self, map_: Map, directory_name: Path) -> None:
+    def draw_for_map(self, osm_data: OSMData, directory_name: Path) -> None:
         """Draw tile using existing map."""
         lat1, lon1 = self.get_coordinates()
         lat2, lon2 = Tile(self.x + 1, self.y + 1, self.scale).get_coordinates()
@@ -266,17 +259,11 @@ class Tile:
         )
         scheme: Scheme = Scheme(workspace.DEFAULT_SCHEME_PATH)
         constructor: Constructor = Constructor(
-            map_, flinger, scheme, icon_extractor
+            osm_data, flinger, scheme, icon_extractor
         )
         constructor.construct()
 
-        painter: Painter = Painter(
-            map_=map_,
-            flinger=flinger,
-            svg=svg,
-            icon_extractor=icon_extractor,
-            scheme=scheme,
-        )
+        painter: Map = Map(flinger=flinger, svg=svg, scheme=scheme)
         painter.draw(constructor)
 
         logging.info(f"Writing output SVG {output_file_name}...")
@@ -291,7 +278,7 @@ def ui(options) -> None:
     directory: Path = workspace.get_tile_path()
 
     if options.coordinates:
-        coordinates: List[float] = list(
+        coordinates: list[float] = list(
             map(float, options.coordinates.strip().split(","))
         )
         tile: Tile = Tile.from_coordinates(np.array(coordinates), options.scale)
diff --git a/roentgen/ui.py b/roentgen/ui.py
index 39abc5c..aac3907 100644
--- a/roentgen/ui.py
+++ b/roentgen/ui.py
@@ -13,50 +13,48 @@ from dataclasses import dataclass
 
 import numpy as np
 
+from roentgen.osm_reader import STAGES_OF_DECAY
+
 BOXES: str = " ▏▎▍▌▋▊▉"
 BOXES_LENGTH: int = len(BOXES)
 
 AUTHOR_MODE: str = "author"
 TIME_MODE: str = "time"
 
+LATITUDE_MAX_DIFFERENCE: float = 0.5
+LONGITUDE_MAX_DIFFERENCE: float = 0.5
+
 
 def parse_options(args) -> argparse.Namespace:
-    """
-    Parse Röntgen command-line options.
-    """
-    parser = argparse.ArgumentParser(
+    """Parse Röntgen command-line options."""
+    parser: argparse.ArgumentParser = argparse.ArgumentParser(
         description="Röntgen. OpenStreetMap renderer with custom icon set"
     )
     subparser = parser.add_subparsers(dest="command")
 
-    render = subparser.add_parser("render")
-    subparser.add_parser("icons")
-    mapcss = subparser.add_parser("mapcss")
-    subparser.add_parser("taginfo")
-    tile = subparser.add_parser("tile")
-    element = subparser.add_parser("element")
-    server = subparser.add_parser("server")
+    add_render_arguments(subparser.add_parser("render"))
+    add_tile_arguments(subparser.add_parser("tile"))
+    add_server_arguments(subparser.add_parser("server"))
+    add_element_arguments(subparser.add_parser("element"))
+    add_mapcss_arguments(subparser.add_parser("mapcss"))
 
-    add_render_arguments(render)
-    add_tile_arguments(tile)
-    add_server_arguments(server)
-    add_element_arguments(element)
-    add_mapcss_arguments(mapcss)
+    subparser.add_parser("icons")
+    subparser.add_parser("taginfo")
 
     arguments: argparse.Namespace = parser.parse_args(args[1:])
 
     return arguments
 
 
-def add_tile_arguments(tile) -> None:
+def add_tile_arguments(parser: argparse.ArgumentParser) -> None:
     """Add arguments for tile command."""
-    tile.add_argument(
+    parser.add_argument(
         "-c",
         "--coordinates",
         metavar="<latitude>,<longitude>",
         help="coordinates of any location inside the tile",
     )
-    tile.add_argument(
+    parser.add_argument(
         "-s",
         "--scale",
         type=int,
@@ -64,19 +62,19 @@ def add_tile_arguments(tile) -> None:
         help="OSM zoom level",
         default=18,
     )
-    tile.add_argument(
+    parser.add_argument(
         "-t",
         "--tile",
         metavar="<scale>/<x>/<y>",
         help="tile specification",
     )
-    tile.add_argument(
+    parser.add_argument(
         "--cache",
         help="path for temporary OSM files",
         default="cache",
         metavar="<path>",
     )
-    tile.add_argument(
+    parser.add_argument(
         "-b",
         "--boundary-box",
         help="construct the minimum amount of tiles that cover requested "
@@ -85,9 +83,9 @@ def add_tile_arguments(tile) -> None:
     )
 
 
-def add_server_arguments(tile) -> None:
+def add_server_arguments(parser: argparse.ArgumentParser) -> None:
     """Add arguments for server command."""
-    tile.add_argument(
+    parser.add_argument(
         "--cache",
         help="path for temporary OSM files",
         default="cache",
@@ -95,16 +93,16 @@ def add_server_arguments(tile) -> None:
     )
 
 
-def add_element_arguments(element) -> None:
+def add_element_arguments(parser: argparse.ArgumentParser) -> None:
     """Add arguments for element command."""
-    element.add_argument("-n", "--node")
-    element.add_argument("-w", "--way")
-    element.add_argument("-r", "--relation")
+    parser.add_argument("-n", "--node")
+    parser.add_argument("-w", "--way")
+    parser.add_argument("-r", "--relation")
 
 
-def add_render_arguments(render) -> None:
+def add_render_arguments(parser: argparse.ArgumentParser) -> None:
     """Add arguments for render command."""
-    render.add_argument(
+    parser.add_argument(
         "-i",
         "--input",
         dest="input_file_name",
@@ -113,7 +111,7 @@ def add_render_arguments(render) -> None:
         help="input XML file name or names (if not specified, file will be "
         "downloaded using OpenStreetMap API)",
     )
-    render.add_argument(
+    parser.add_argument(
         "-o",
         "--output",
         dest="output_file_name",
@@ -121,14 +119,14 @@ def add_render_arguments(render) -> None:
         default="out/map.svg",
         help="output SVG file name",
     )
-    render.add_argument(
+    parser.add_argument(
         "-b",
         "--boundary-box",
         metavar="<lon1>,<lat1>,<lon2>,<lat2>",
         help='geo boundary box, use space before "-" if the first value is '
         "negative",
     )
-    render.add_argument(
+    parser.add_argument(
         "-s",
         "--scale",
         metavar="<float>",
@@ -136,61 +134,63 @@ def add_render_arguments(render) -> None:
         default=18,
         type=float,
     )
-    render.add_argument(
+    parser.add_argument(
         "--cache",
         help="path for temporary OSM files",
         default="cache",
         metavar="<path>",
     )
-    render.add_argument(
+    parser.add_argument(
         "--labels",
         help="label drawing mode: `no`, `main`, or `all`",
         dest="label_mode",
         default="main",
     )
-    render.add_argument(
+    parser.add_argument(
         "--overlap",
         dest="overlap",
         default=12,
         type=int,
         help="how many pixels should be left around icons and text",
     )
-    render.add_argument(
+    parser.add_argument(
         "--mode",
         default="normal",
         help="map drawing mode",
     )
-    render.add_argument(
+    parser.add_argument(
         "--seed",
         default="",
         help="seed for random",
     )
-    render.add_argument(
+    parser.add_argument(
         "--level",
         default=None,
         help="display only this floor level",
     )
 
 
-def add_mapcss_arguments(mapcss) -> None:
+def add_mapcss_arguments(parser: argparse.ArgumentParser) -> None:
     """Add arguments for mapcss command."""
-    mapcss.add_argument(
+    parser.add_argument(
         "--icons",
         action=argparse.BooleanOptionalAction,
         default=True,
         help="add icons for nodes and areas",
     )
-    mapcss.add_argument(
+    parser.add_argument(
         "--ways",
         action=argparse.BooleanOptionalAction,
         default=True,
         help="add style for ways and relations",
     )
-    mapcss.add_argument(
+    parser.add_argument(
         "--lifecycle",
         action=argparse.BooleanOptionalAction,
         default=True,
-        help="add icons for lifecycle tags",
+        help="add icons for lifecycle tags; be careful: this will increase the "
+        f"number of node and area selectors by {len(STAGES_OF_DECAY) + 1} "
+        f"times",
     )
 
 
@@ -245,6 +245,8 @@ class BoundaryBox:
             <longitude 1>,<latitude 1>,<longitude 2>,<latitude 2> or simply
             <left>,<bottom>,<right>,<top>.
         """
+        boundary_box = boundary_box.replace(" ", "")
+
         matcher = re.match(
             "(?P<left>[0-9.-]*),(?P<bottom>[0-9.-]*),"
             + "(?P<right>[0-9.-]*),(?P<top>[0-9.-]*)",
@@ -256,10 +258,10 @@ class BoundaryBox:
             return None
 
         try:
-            left = float(matcher.group("left"))
-            bottom = float(matcher.group("bottom"))
-            right = float(matcher.group("right"))
-            top = float(matcher.group("top"))
+            left: float = float(matcher.group("left"))
+            bottom: float = float(matcher.group("bottom"))
+            right: float = float(matcher.group("right"))
+            top: float = float(matcher.group("top"))
         except ValueError:
             logging.fatal("Invalid boundary box.")
             return None
@@ -270,7 +272,10 @@ class BoundaryBox:
         if bottom >= top:
             logging.error("Negative vertical boundary.")
             return None
-        if right - left > 0.5 or top - bottom > 0.5:
+        if (
+            right - left > LONGITUDE_MAX_DIFFERENCE
+            or top - bottom > LATITUDE_MAX_DIFFERENCE
+        ):
             logging.error("Boundary box is too big.")
             return None
 
@@ -285,9 +290,7 @@ class BoundaryBox:
         return self.bottom, self.right
 
     def round(self) -> "BoundaryBox":
-        """
-        Round boundary box.
-        """
+        """Round boundary box."""
         self.left = round(self.left * 1000) / 1000 - 0.001
         self.bottom = round(self.bottom * 1000) / 1000 - 0.001
         self.right = round(self.right * 1000) / 1000 + 0.001
diff --git a/roentgen/util.py b/roentgen/util.py
index 5d58e80..0128d9b 100644
--- a/roentgen/util.py
+++ b/roentgen/util.py
@@ -18,28 +18,20 @@ class MinMax:
     max_: Any = None
 
     def update(self, value: Any) -> None:
-        """
-        Update minimum and maximum with new value.
-        """
+        """Update minimum and maximum with new value."""
         self.min_ = value if not self.min_ or value < self.min_ else self.min_
         self.max_ = value if not self.max_ or value > self.max_ else self.max_
 
     def delta(self) -> Any:
-        """
-        Difference between maximum and minimum.
-        """
+        """Difference between maximum and minimum."""
         return self.max_ - self.min_
 
     def center(self) -> Any:
-        """
-        Get middle point between minimum and maximum.
-        """
+        """Get middle point between minimum and maximum."""
         return (self.min_ + self.max_) / 2
 
     def is_empty(self) -> bool:
-        """
-        Check if interval is empty.
-        """
+        """Check if interval is empty."""
         return self.min_ == self.max_
 
     def __repr__(self) -> str:
diff --git a/roentgen/vector.py b/roentgen/vector.py
index 56fb22b..3236e3f 100644
--- a/roentgen/vector.py
+++ b/roentgen/vector.py
@@ -12,12 +12,15 @@ def compute_angle(vector: np.array):
     For the given vector compute an angle between it and (1, 0) vector.  The
     result is in [0, 2π].
     """
+    if vector[0] == 0:
+        if vector[1] > 0:
+            return np.pi / 2
+        return np.pi + np.pi / 2
     if vector[0] < 0:
         return np.arctan(vector[1] / vector[0]) + np.pi
     if vector[1] < 0:
         return np.arctan(vector[1] / vector[0]) + 2 * np.pi
-    else:
-        return np.arctan(vector[1] / vector[0])
+    return np.arctan(vector[1] / vector[0])
 
 
 def turn_by_angle(vector: np.array, angle: float):
diff --git a/roentgen/workspace.py b/roentgen/workspace.py
index eccd8bb..3eddece 100644
--- a/roentgen/workspace.py
+++ b/roentgen/workspace.py
@@ -15,6 +15,10 @@ def check_and_create(directory: Path) -> Path:
 
 
 class Workspace:
+    """
+    Project file and directory paths and generated files and directories.
+    """
+
     # Project directories and files, that are the part of the repository.
 
     SCHEME_PATH: Path = Path("scheme")
diff --git a/test/test_boundary_box.py b/test/test_boundary_box.py
index 88ff49a..8f229e3 100644
--- a/test/test_boundary_box.py
+++ b/test/test_boundary_box.py
@@ -8,9 +8,10 @@ __email__ = "me@enzet.ru"
 
 
 def test_round_zero_coordinates() -> None:
-    box: BoundaryBox = BoundaryBox(0, 0, 0, 0).round()
-
-    assert box.get_format() == "-0.001,-0.001,0.001,0.001"
+    assert (
+        BoundaryBox(0, 0, 0, 0).round().get_format()
+        == "-0.001,-0.001,0.001,0.001"
+    )
 
 
 def test_round_coordinates() -> None:
diff --git a/test/test_color.py b/test/test_color.py
index d3d843a..5e5caea 100644
--- a/test/test_color.py
+++ b/test/test_color.py
@@ -11,9 +11,7 @@ __email__ = "me@enzet.ru"
 
 
 def test_is_bright() -> None:
-    """
-    Test detecting color brightness.
-    """
+    """Test detecting color brightness."""
     assert is_bright(Color("white"))
     assert is_bright(Color("yellow"))
     assert not is_bright(Color("brown"))
@@ -21,9 +19,7 @@ def test_is_bright() -> None:
 
 
 def test_gradient() -> None:
-    """
-    Test color picking from gradient.
-    """
+    """Test color picking from gradient."""
     color: Color = get_gradient_color(
         0.5, MinMax(0, 1), [Color("black"), Color("white")]
     )
diff --git a/test/test_flinger.py b/test/test_flinger.py
index a647ad1..c6de953 100644
--- a/test/test_flinger.py
+++ b/test/test_flinger.py
@@ -10,9 +10,7 @@ __email__ = "me@enzet.ru"
 
 
 def test_pseudo_mercator() -> None:
-    """
-    Test pseudo-Mercator projection.
-    """
+    """Test pseudo-Mercator projection."""
     assert np.allclose(pseudo_mercator(np.array((0, 0))), np.array((0, 0)))
     assert np.allclose(pseudo_mercator(np.array((0, 10))), np.array((10, 0)))
     assert np.allclose(
@@ -21,9 +19,7 @@ def test_pseudo_mercator() -> None:
 
 
 def test_osm_zoom_level_to_pixels_per_meter() -> None:
-    """
-    Test scale computation.
-    """
+    """Test scale computation."""
     assert np.allclose(
         osm_zoom_level_to_pixels_per_meter(18), 1.6759517949045808
     )
diff --git a/test/test_icons.py b/test/test_icons.py
index de1d982..a37f404 100644
--- a/test/test_icons.py
+++ b/test/test_icons.py
@@ -1,8 +1,6 @@
 """
 Test icon generation for nodes.
 """
-from typing import Dict, Set
-
 import pytest
 
 from roentgen.grid import IconCollection
@@ -34,11 +32,9 @@ def test_icons_by_name(init_collection) -> None:
     init_collection.draw_icons(workspace.get_icons_by_name_path(), by_name=True)
 
 
-def get_icon(tags: Dict[str, str]) -> IconSet:
-    """
-    Construct icon from tags.
-    """
-    processed: Set[str] = set()
+def get_icon(tags: dict[str, str]) -> IconSet:
+    """Construct icon from tags."""
+    processed: set[str] = set()
     icon, _ = SCHEME.get_icon(SHAPE_EXTRACTOR, tags, processed)
     return icon
 
diff --git a/test/test_label.py b/test/test_label.py
index 041ea84..6219e27 100644
--- a/test/test_label.py
+++ b/test/test_label.py
@@ -1,8 +1,6 @@
 """
 Test label generation for nodes.
 """
-from typing import List, Set
-
 from roentgen.text import Label
 from test import SCHEME
 
@@ -10,18 +8,14 @@ __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"
 
 
-def construct_labels(tags) -> List[Label]:
-    """
-    Construct labels from OSM node tags.
-    """
-    processed: Set[str] = set()
+def construct_labels(tags) -> list[Label]:
+    """Construct labels from OSM node tags."""
+    processed: set[str] = set()
     return SCHEME.construct_text(tags, "all", processed)
 
 
 def test_1_label() -> None:
-    """
-    Test tags that should be converted into single label.
-    """
+    """Test tags that should be converted into single label."""
     labels = construct_labels({"name": "Name"})
     assert len(labels) == 1
     assert labels[0].text == "Name"
@@ -37,9 +31,7 @@ def test_1_label_unknown_tags() -> None:
 
 
 def test_2_labels() -> None:
-    """
-    Test tags that should be converted into two labels.
-    """
+    """Test tags that should be converted into two labels."""
     labels = construct_labels({"name": "Name", "ref": "5"})
     assert len(labels) == 2
     assert labels[0].text == "Name"
diff --git a/test/test_mapcss.py b/test/test_mapcss.py
index aa0d5e9..2ff8d98 100644
--- a/test/test_mapcss.py
+++ b/test/test_mapcss.py
@@ -10,9 +10,7 @@ __email__ = "me@enzet.ru"
 
 
 def test_mapcss() -> None:
-    """
-    Test MapCSS generation.
-    """
+    """Test MapCSS generation."""
     writer: MapCSSWriter = MapCSSWriter(SCHEME, "icons")
     matcher: NodeMatcher = NodeMatcher(
         {"tags": {"natural": "tree"}, "shapes": ["tree"]}
diff --git a/test/test_osm_reader.py b/test/test_osm_reader.py
index f3d6216..6298689 100644
--- a/test/test_osm_reader.py
+++ b/test/test_osm_reader.py
@@ -3,35 +3,31 @@ Test OSM XML parsing.
 """
 import numpy as np
 
-from roentgen.osm_reader import OSMNode, OSMReader, OSMRelation, OSMWay
+from roentgen.osm_reader import OSMNode, OSMReader, OSMRelation, OSMWay, OSMData
 
 __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"
 
 
 def test_node() -> None:
-    """
-    Test OSM node parsing from XML.
-    """
-    reader = OSMReader()
-    map_ = reader.parse_osm_text(
+    """Test OSM node parsing from XML."""
+    reader: OSMReader = OSMReader()
+    osm_data: OSMData = reader.parse_osm_text(
         """<?xml version="1.0"?>
 <osm>
   <node id="42" lon="5" lat="10" />
 </osm>"""
     )
-    assert 42 in map_.nodes
-    node: OSMNode = map_.nodes[42]
+    assert 42 in osm_data.nodes
+    node: OSMNode = osm_data.nodes[42]
     assert node.id_ == 42
     assert np.allclose(node.coordinates, np.array([10, 5]))
 
 
 def test_node_with_tag() -> None:
-    """
-    Test OSM node parsing from XML.
-    """
+    """Test OSM node parsing from XML."""
     reader = OSMReader()
-    map_ = reader.parse_osm_text(
+    osm_data: OSMData = reader.parse_osm_text(
         """<?xml version="1.0"?>
 <osm>
   <node id="42" lon="5" lat="10">
@@ -39,35 +35,31 @@ def test_node_with_tag() -> None:
   </node>
 </osm>"""
     )
-    assert 42 in map_.nodes
-    node: OSMNode = map_.nodes[42]
+    assert 42 in osm_data.nodes
+    node: OSMNode = osm_data.nodes[42]
     assert node.id_ == 42
     assert np.allclose(node.coordinates, np.array([10, 5]))
     assert node.tags["key"] == "value"
 
 
 def test_way() -> None:
-    """
-    Test OSM way parsing from XML.
-    """
-    reader = OSMReader()
-    map_ = reader.parse_osm_text(
+    """Test OSM way parsing from XML."""
+    reader: OSMReader = OSMReader()
+    osm_data: OSMData = reader.parse_osm_text(
         """<?xml version="1.0"?>
 <osm>
   <way id="42" />
 </osm>"""
     )
-    assert 42 in map_.ways
-    way: OSMWay = map_.ways[42]
+    assert 42 in osm_data.ways
+    way: OSMWay = osm_data.ways[42]
     assert way.id_ == 42
 
 
 def test_nodes() -> None:
-    """
-    Test OSM node parsing from XML.
-    """
+    """Test OSM node parsing from XML."""
     reader = OSMReader()
-    map_ = reader.parse_osm_text(
+    osm_data: OSMData = reader.parse_osm_text(
         """<?xml version="1.0"?>
 <osm>
   <node id="1" lon="5" lat="10" />
@@ -77,18 +69,16 @@ def test_nodes() -> None:
   </way>
 </osm>"""
     )
-    way: OSMWay = map_.ways[2]
+    way: OSMWay = osm_data.ways[2]
     assert len(way.nodes) == 1
     assert way.nodes[0].id_ == 1
     assert way.tags["key"] == "value"
 
 
 def test_relation() -> None:
-    """
-    Test OSM node parsing from XML.
-    """
-    reader = OSMReader()
-    map_ = reader.parse_osm_text(
+    """Test OSM node parsing from XML."""
+    reader: OSMReader = OSMReader()
+    osm_data: OSMData = reader.parse_osm_text(
         """<?xml version="1.0"?>
 <osm>
   <node id="1" lon="5" lat="10" />
@@ -101,8 +91,8 @@ def test_relation() -> None:
   </relation>
 </osm>"""
     )
-    assert 3 in map_.relations
-    relation: OSMRelation = map_.relations[3]
+    assert 3 in osm_data.relations
+    relation: OSMRelation = osm_data.relations[3]
     assert relation.id_ == 3
     assert relation.tags["key"] == "value"
     assert len(relation.members) == 1
diff --git a/test/test_style.py b/test/test_style.py
index b35ca7a..3722897 100644
--- a/test/test_style.py
+++ b/test/test_style.py
@@ -8,23 +8,17 @@ __email__ = "me@enzet.ru"
 
 
 def test_style_empty() -> None:
-    """
-    Test constructing style of empty tags.
-    """
+    """Test constructing style of empty tags."""
     assert SCHEME.get_style({}, 18) == []
 
 
 def test_style_unknown() -> None:
-    """
-    Test constructing style of unknown tags.
-    """
+    """Test constructing style of unknown tags."""
     assert SCHEME.get_style({"aaa": "bbb"}, 18) == []
 
 
 def test_style_area() -> None:
-    """
-    Test constructing style of landuse=grass.
-    """
+    """Test constructing style of landuse=grass."""
     style = SCHEME.get_style({"landuse": "grass"}, 18)
     assert len(style) == 1
     assert style[0].style == {"fill": "#CFE0A8", "stroke": "#BFD098"}
diff --git a/test/test_tag.py b/test/test_tag.py
index e5b365a..03c5ca7 100644
--- a/test/test_tag.py
+++ b/test/test_tag.py
@@ -10,18 +10,14 @@ __email__ = "me@enzet.ru"
 
 
 def check_length(value: str, expected: Optional[float]) -> None:
-    """
-    Assert that constructed value is equals to an expected one.
-    """
+    """Assert that constructed value is equals to an expected one."""
     tagged = Tagged()
     tagged.tags["a"] = value
     assert tagged.get_length("a") == expected
 
 
 def test_meters() -> None:
-    """
-    Test length in meters processing.
-    """
+    """Test length in meters processing."""
     check_length("50m", 50.0)
     check_length("50.m", 50.0)
     check_length("50.05m", 50.05)
@@ -31,16 +27,12 @@ def test_meters() -> None:
 
 
 def test_kilometers() -> None:
-    """
-    Test length in meters processing.
-    """
+    """Test length in meters processing."""
     check_length("50km", 50_000.0)
     check_length("50 km", 50_000.0)
 
 
 def test_miles() -> None:
-    """
-    Test length in meters processing.
-    """
+    """Test length in meters processing."""
     check_length("1mi", 1609.344)
     check_length("50 mi", 50 * 1609.344)
diff --git a/test/test_text.py b/test/test_text.py
index f152d09..156c719 100644
--- a/test/test_text.py
+++ b/test/test_text.py
@@ -8,8 +8,6 @@ __email__ = "me@enzet.ru"
 
 
 def test_voltage() -> None:
-    """
-    Test voltage tag value processing.
-    """
+    """Test voltage tag value processing."""
     assert format_voltage("42") == "42 V"
     assert format_voltage("42000") == "42 kV"