From 9a6f8d2f872c42f7b74491603a414d8a85a2ba83 Mon Sep 17 00:00:00 2001
From: Sergey Vartanov <me@enzet.ru>
Date: Wed, 26 Jan 2022 01:44:22 +0300
Subject: [PATCH] Issue #103: support credits.

---
 map_machine/drawing.py         | 29 +++++++++++++++++++++++++
 map_machine/mapper.py          | 31 ++++++++++++++++++++++++---
 map_machine/pictogram/point.py | 39 +++++++++++-----------------------
 3 files changed, 69 insertions(+), 30 deletions(-)

diff --git a/map_machine/drawing.py b/map_machine/drawing.py
index ccf963c..10b88d6 100644
--- a/map_machine/drawing.py
+++ b/map_machine/drawing.py
@@ -20,6 +20,8 @@ __email__ = "me@enzet.ru"
 
 PathCommands = list[Union[float, str, np.ndarray]]
 
+DEFAULT_FONT: str = "Helvetica"
+
 
 @dataclass
 class Style:
@@ -295,3 +297,30 @@ def parse_path(path: str) -> PathCommands:
         index += 1
 
     return result
+
+
+def draw_text(
+    svg: svgwrite.Drawing,
+    text: str,
+    point: np.ndarray,
+    size: float,
+    fill: Color,
+    anchor: str = "middle",
+    stroke_linejoin: str = "round",
+    stroke_width: float = 1.0,
+    stroke: Optional[Color] = None,
+    opacity: float = 1.0,
+):
+    text_element = svg.text(
+        text,
+        point,
+        font_size=size,
+        text_anchor=anchor,
+        font_family=DEFAULT_FONT,
+        fill=fill.hex,
+        stroke_linejoin=stroke_linejoin,
+        stroke_width=stroke_width,
+        stroke=stroke.hex if stroke else "none",
+        opacity=opacity,
+    )
+    svg.add(text_element)
diff --git a/map_machine/mapper.py b/map_machine/mapper.py
index ca696a1..f67cceb 100644
--- a/map_machine/mapper.py
+++ b/map_machine/mapper.py
@@ -15,6 +15,7 @@ from svgwrite.path import Path as SVGPath
 from svgwrite.shapes import Rect
 
 from map_machine.constructor import Constructor
+from map_machine.drawing import draw_text
 from map_machine.feature.road import Intersection, Road, RoadPart
 from map_machine.figure import StyledFigure
 from map_machine.geometry.boundary_box import BoundaryBox
@@ -113,6 +114,8 @@ class Map:
                     self.svg, occupied, self.configuration.label_mode
                 )
 
+        self.draw_credits(constructor.flinger.size)
+
     def draw_buildings(self, constructor: Constructor) -> None:
         """Draw buildings: shade, walls, and roof."""
         if self.configuration.building_mode == BuildingMode.NO:
@@ -172,10 +175,32 @@ class Map:
             intersection: Intersection = Intersection(list(parts))
             intersection.draw(self.svg, True)
 
+    def draw_credits(self, size: np.ndarray):
+
+        for text, point in (
+            ("Rendering: © Map Machine", np.array((15, 27))),
+            ("Data: © OpenStreetMap contributors", np.array((15, 15))),
+        ):
+            for stroke_width, stroke, opacity in (
+                (3.0, Color("white"), 0.7),
+                (1.0, None, 1.0),
+            ):
+                draw_text(
+                    self.svg,
+                    text,
+                    size - point,
+                    10,
+                    Color("#888888"),
+                    anchor="end",
+                    stroke_width=stroke_width,
+                    stroke=stroke,
+                    opacity=opacity,
+                )
+
 
 def render_map(arguments: argparse.Namespace) -> None:
     """
-    Map Machine entry point.
+    Map rendering entry point.
 
     :param arguments: command-line arguments
     """
@@ -257,10 +282,10 @@ def render_map(arguments: argparse.Namespace) -> None:
     )
     constructor.construct()
 
-    painter: Map = Map(
+    map_: Map = Map(
         flinger=flinger, svg=svg, scheme=scheme, configuration=configuration
     )
-    painter.draw(constructor)
+    map_.draw(constructor)
 
     logging.info(f"Writing output SVG to {arguments.output_file_name}...")
     with open(arguments.output_file_name, "w", encoding="utf-8") as output_file:
diff --git a/map_machine/pictogram/point.py b/map_machine/pictogram/point.py
index a88b8d8..36887fd 100644
--- a/map_machine/pictogram/point.py
+++ b/map_machine/pictogram/point.py
@@ -7,6 +7,7 @@ import numpy as np
 import svgwrite
 from colour import Color
 
+from map_machine.drawing import draw_text
 from map_machine.map_configuration import LabelMode
 from map_machine.osm.osm_reader import Tagged
 from map_machine.pictogram.icon import Icon, IconSet
@@ -15,8 +16,6 @@ from map_machine.text import Label
 __author__ = "Sergey Vartanov"
 __email__ = "me@enzet.ru"
 
-DEFAULT_FONT: str = "Helvetica"
-
 
 class Occupied:
     """
@@ -238,42 +237,28 @@ class Point(Tagged):
                         svg.add(svg.rect((point[0] + i, point[1] + j), (1, 1)))
 
         if out_fill_2:
-            text_element = svg.text(
+            draw_text(
+                svg,
                 text,
                 point,
-                font_size=size,
-                text_anchor="middle",
-                font_family=DEFAULT_FONT,
-                fill=out_fill_2.hex,
-                stroke_linejoin="round",
+                size,
+                fill=out_fill_2,
                 stroke_width=5.0,
-                stroke=out_fill_2.hex,
+                stroke=out_fill_2,
                 opacity=out_opacity_2,
             )
-            svg.add(text_element)
         if out_fill:
-            text_element = svg.text(
+            draw_text(
+                svg,
                 text,
                 point,
-                font_size=size,
-                text_anchor="middle",
-                font_family=DEFAULT_FONT,
-                fill=out_fill.hex,
-                stroke_linejoin="round",
+                size,
+                fill,
                 stroke_width=3.0,
-                stroke=out_fill.hex,
+                stroke=out_fill,
                 opacity=out_opacity,
             )
-            svg.add(text_element)
-        text_element = svg.text(
-            text,
-            point,
-            font_size=size,
-            text_anchor="middle",
-            font_family=DEFAULT_FONT,
-            fill=fill.hex,
-        )
-        svg.add(text_element)
+        draw_text(svg, text, point, size, fill)
 
         self.y += 11