141 lines
4.5 KiB
Python
141 lines
4.5 KiB
Python
# Copyright (c) 2019-2024 Manfred Moitzi
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# License: MIT License
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from __future__ import annotations
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from typing import Iterable, Optional, Iterator, TYPE_CHECKING, overload
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import math
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from ezdxf.math import Vec2, UVec, Matrix44
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__all__ = ["Shape2d"]
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if TYPE_CHECKING:
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from ezdxf.math import BoundingBox2d
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class Shape2d:
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"""Construction tools for 2D shapes.
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A 2D geometry object as list of :class:`Vec2` objects, vertices can be
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moved, rotated and scaled.
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Args:
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vertices: iterable of :class:`Vec2` compatible objects.
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"""
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def __init__(self, vertices: Optional[Iterable[UVec]] = None):
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from ezdxf.npshapes import NumpyPoints2d
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_vec2: Iterator[Vec2] | None = None
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if vertices is not None:
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_vec2 = Vec2.generate(vertices)
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self.np_vertices = NumpyPoints2d(_vec2)
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@property
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def vertices(self) -> list[Vec2]:
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return self.np_vertices.vertices()
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@property
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def bounding_box(self) -> BoundingBox2d:
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"""Returns the bounding box of the shape."""
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return self.np_vertices.bbox()
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def copy(self) -> Shape2d:
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clone = self.__class__()
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clone.np_vertices = self.np_vertices.clone()
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return clone
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__copy__ = copy
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def translate(self, vector: UVec) -> None:
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"""Translate shape about `vector`."""
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offset = Vec2(vector)
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self.np_vertices.transform_inplace(Matrix44.translate(offset.x, offset.y, 0))
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def scale(self, sx: float = 1.0, sy: float = 1.0) -> None:
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"""Scale shape about `sx` in x-axis and `sy` in y-axis."""
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self.np_vertices.transform_inplace(Matrix44.scale(sx, sy, 1))
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def scale_uniform(self, scale: float) -> None:
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"""Scale shape uniform about `scale` in x- and y-axis."""
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self.np_vertices.transform_inplace(Matrix44.scale(scale, scale, 1))
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def rotate(self, angle: float, center: Optional[UVec] = None) -> None:
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"""Rotate shape around rotation `center` about `angle` in degrees."""
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self.rotate_rad(math.radians(angle), center)
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def rotate_rad(self, angle: float, center: Optional[UVec] = None) -> None:
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"""Rotate shape around rotation `center` about `angle` in radians."""
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m = Matrix44.z_rotate(angle)
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if center is not None:
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p = Vec2(center)
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m = (
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Matrix44.translate(-p.x, -p.y, 0)
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@ m
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@ Matrix44.translate(p.x, p.y, 0)
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)
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self.np_vertices.transform_inplace(m)
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def offset(self, offset: float, closed: bool = False) -> Shape2d:
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"""Returns a new offset shape, for more information see also
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:func:`ezdxf.math.offset_vertices_2d` function.
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Args:
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offset: line offset perpendicular to direction of shape segments
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defined by vertices order, offset > ``0`` is 'left' of line
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segment, offset < ``0`` is 'right' of line segment
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closed: ``True`` to handle as closed shape
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"""
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from ezdxf.math.offset2d import offset_vertices_2d
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return self.__class__(
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offset_vertices_2d(
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self.np_vertices.vertices(), offset=offset, closed=closed
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)
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)
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def convex_hull(self) -> Shape2d:
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"""Returns convex hull as new shape."""
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from ezdxf.math.construct2d import convex_hull_2d
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return self.__class__(convex_hull_2d(self.np_vertices.vertices()))
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# Sequence interface
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def __len__(self) -> int:
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"""Returns `count` of vertices."""
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return len(self.np_vertices)
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@overload
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def __getitem__(self, item: int) -> Vec2: ...
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@overload
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def __getitem__(self, item: slice) -> list[Vec2]: ...
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def __getitem__(self, item: int | slice) -> Vec2|list[Vec2]:
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"""Get vertex by index `item`, supports ``list`` like slicing."""
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np_vertices = self.np_vertices.np_vertices()
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if isinstance(item, int):
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return Vec2(np_vertices[item])
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else:
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return Vec2.list(np_vertices[item])
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def append(self, vertex: UVec) -> None:
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"""Append single `vertex`.
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Args:
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vertex: vertex as :class:`Vec2` compatible object
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"""
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self.extend((vertex,))
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def extend(self, vertices: Iterable[UVec]) -> None:
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"""Append multiple `vertices`.
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Args:
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vertices: iterable of vertices as :class:`Vec2` compatible objects
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"""
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from ezdxf.npshapes import NumpyPoints2d
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new_vertices = self.np_vertices.vertices() + Vec2.list(vertices)
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self.np_vertices = NumpyPoints2d(new_vertices)
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