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139 lines
3.7 KiB
Python
139 lines
3.7 KiB
Python
"""
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Figures displayed on the map.
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"""
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import numpy as np
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from map_machine.geometry.flinger import Flinger
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from map_machine.osm.osm_reader import OSMNode, Tagged
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from map_machine.scheme import LineStyle
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__author__ = "Sergey Vartanov"
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__email__ = "me@enzet.ru"
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from map_machine.geometry.vector import Polyline
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class Figure(Tagged):
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"""Some figure on the map: way or area."""
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def __init__(
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self,
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tags: dict[str, str],
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inners: list[list[OSMNode]],
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outers: list[list[OSMNode]],
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) -> None:
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super().__init__(tags)
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if inners and outers:
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self.inners: list[list[OSMNode]] = list(map(make_clockwise, inners))
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self.outers: list[list[OSMNode]] = list(
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map(make_counter_clockwise, outers)
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)
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else:
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self.inners = inners
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self.outers = outers
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def get_path(
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self, flinger: Flinger, offset: np.ndarray = np.array((0.0, 0.0))
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) -> str:
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"""
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Get SVG path commands.
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:param flinger: converter for geo coordinates
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:param offset: offset vector
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"""
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path: str = ""
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for outer_nodes in self.outers:
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path += f"{get_path(outer_nodes, offset, flinger)} "
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for inner_nodes in self.inners:
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path += f"{get_path(inner_nodes, offset, flinger)} "
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return path
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class StyledFigure(Figure):
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"""Figure with stroke and fill style."""
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def __init__(
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self,
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tags: dict[str, str],
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inners: list[list[OSMNode]],
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outers: list[list[OSMNode]],
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line_style: LineStyle,
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) -> None:
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super().__init__(tags, inners, outers)
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self.line_style: LineStyle = line_style
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def get_path(
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self,
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flinger: Flinger,
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offset: np.ndarray = np.array((0.0, 0.0)),
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) -> str:
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"""
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Get SVG path commands.
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:param flinger: converter for geo coordinates
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:param offset: offset vector
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"""
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path: str = ""
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for outer_nodes in self.outers:
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commands: str = get_path(
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outer_nodes, offset, flinger, self.line_style.parallel_offset
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)
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path += f"{commands} "
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for inner_nodes in self.inners:
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commands: str = get_path(
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inner_nodes, offset, flinger, self.line_style.parallel_offset
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)
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path += f"{commands} "
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return path
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def is_clockwise(polygon: list[OSMNode]) -> bool:
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"""
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Return true if polygon nodes are in clockwise order.
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:param polygon: list of OpenStreetMap nodes
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"""
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count: float = 0.0
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for index, node in enumerate(polygon):
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next_index: int = 0 if index == len(polygon) - 1 else index + 1
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count += (polygon[next_index].coordinates[0] - node.coordinates[0]) * (
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polygon[next_index].coordinates[1] + node.coordinates[1]
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)
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return count >= 0.0
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def make_clockwise(polygon: list[OSMNode]) -> list[OSMNode]:
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"""
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Make polygon nodes clockwise.
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:param polygon: list of OpenStreetMap nodes
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"""
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return polygon if is_clockwise(polygon) else list(reversed(polygon))
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def make_counter_clockwise(polygon: list[OSMNode]) -> list[OSMNode]:
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"""
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Make polygon nodes counter-clockwise.
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:param polygon: list of OpenStreetMap nodes
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"""
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return polygon if not is_clockwise(polygon) else list(reversed(polygon))
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def get_path(
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nodes: list[OSMNode],
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shift: np.ndarray,
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flinger: Flinger,
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parallel_offset: float = 0.0,
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) -> str:
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"""Construct SVG path commands from nodes."""
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return Polyline(
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[flinger.fling(node.coordinates) + shift for node in nodes]
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).get_path(parallel_offset)
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