1207 lines
40 KiB
Python
1207 lines
40 KiB
Python
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#
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# The Python Imaging Library
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# $Id$
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#
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# drawing interface operations
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#
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# History:
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# 1996-04-13 fl Created (experimental)
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# 1996-08-07 fl Filled polygons, ellipses.
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# 1996-08-13 fl Added text support
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# 1998-06-28 fl Handle I and F images
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# 1998-12-29 fl Added arc; use arc primitive to draw ellipses
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# 1999-01-10 fl Added shape stuff (experimental)
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# 1999-02-06 fl Added bitmap support
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# 1999-02-11 fl Changed all primitives to take options
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# 1999-02-20 fl Fixed backwards compatibility
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# 2000-10-12 fl Copy on write, when necessary
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# 2001-02-18 fl Use default ink for bitmap/text also in fill mode
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# 2002-10-24 fl Added support for CSS-style color strings
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# 2002-12-10 fl Added experimental support for RGBA-on-RGB drawing
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# 2002-12-11 fl Refactored low-level drawing API (work in progress)
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# 2004-08-26 fl Made Draw() a factory function, added getdraw() support
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# 2004-09-04 fl Added width support to line primitive
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# 2004-09-10 fl Added font mode handling
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# 2006-06-19 fl Added font bearing support (getmask2)
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#
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# Copyright (c) 1997-2006 by Secret Labs AB
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# Copyright (c) 1996-2006 by Fredrik Lundh
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#
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# See the README file for information on usage and redistribution.
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#
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from __future__ import annotations
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import math
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import numbers
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import struct
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from types import ModuleType
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from typing import TYPE_CHECKING, AnyStr, Callable, List, Sequence, Tuple, Union, cast
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from . import Image, ImageColor
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from ._deprecate import deprecate
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from ._typing import Coords
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# experimental access to the outline API
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Outline: Callable[[], Image.core._Outline] | None
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try:
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Outline = Image.core.outline
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except AttributeError:
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Outline = None
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if TYPE_CHECKING:
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from . import ImageDraw2, ImageFont
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_Ink = Union[float, Tuple[int, ...], str]
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"""
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A simple 2D drawing interface for PIL images.
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<p>
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Application code should use the <b>Draw</b> factory, instead of
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directly.
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"""
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class ImageDraw:
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font: (
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ImageFont.ImageFont | ImageFont.FreeTypeFont | ImageFont.TransposedFont | None
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) = None
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def __init__(self, im: Image.Image, mode: str | None = None) -> None:
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"""
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Create a drawing instance.
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:param im: The image to draw in.
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:param mode: Optional mode to use for color values. For RGB
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images, this argument can be RGB or RGBA (to blend the
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drawing into the image). For all other modes, this argument
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must be the same as the image mode. If omitted, the mode
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defaults to the mode of the image.
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"""
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im.load()
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if im.readonly:
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im._copy() # make it writeable
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blend = 0
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if mode is None:
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mode = im.mode
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if mode != im.mode:
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if mode == "RGBA" and im.mode == "RGB":
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blend = 1
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else:
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msg = "mode mismatch"
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raise ValueError(msg)
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if mode == "P":
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self.palette = im.palette
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else:
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self.palette = None
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self._image = im
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self.im = im.im
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self.draw = Image.core.draw(self.im, blend)
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self.mode = mode
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if mode in ("I", "F"):
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self.ink = self.draw.draw_ink(1)
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else:
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self.ink = self.draw.draw_ink(-1)
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if mode in ("1", "P", "I", "F"):
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# FIXME: fix Fill2 to properly support matte for I+F images
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self.fontmode = "1"
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else:
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self.fontmode = "L" # aliasing is okay for other modes
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self.fill = False
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def getfont(
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self,
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) -> ImageFont.ImageFont | ImageFont.FreeTypeFont | ImageFont.TransposedFont:
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"""
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Get the current default font.
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To set the default font for this ImageDraw instance::
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from PIL import ImageDraw, ImageFont
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draw.font = ImageFont.truetype("Tests/fonts/FreeMono.ttf")
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To set the default font for all future ImageDraw instances::
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from PIL import ImageDraw, ImageFont
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ImageDraw.ImageDraw.font = ImageFont.truetype("Tests/fonts/FreeMono.ttf")
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If the current default font is ``None``,
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it is initialized with ``ImageFont.load_default()``.
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:returns: An image font."""
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if not self.font:
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# FIXME: should add a font repository
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from . import ImageFont
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self.font = ImageFont.load_default()
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return self.font
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def _getfont(
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self, font_size: float | None
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) -> ImageFont.ImageFont | ImageFont.FreeTypeFont | ImageFont.TransposedFont:
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if font_size is not None:
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from . import ImageFont
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return ImageFont.load_default(font_size)
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else:
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return self.getfont()
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def _getink(
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self, ink: _Ink | None, fill: _Ink | None = None
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) -> tuple[int | None, int | None]:
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result_ink = None
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result_fill = None
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if ink is None and fill is None:
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if self.fill:
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result_fill = self.ink
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else:
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result_ink = self.ink
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else:
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if ink is not None:
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if isinstance(ink, str):
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ink = ImageColor.getcolor(ink, self.mode)
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if self.palette and not isinstance(ink, numbers.Number):
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ink = self.palette.getcolor(ink, self._image)
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result_ink = self.draw.draw_ink(ink)
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if fill is not None:
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if isinstance(fill, str):
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fill = ImageColor.getcolor(fill, self.mode)
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if self.palette and not isinstance(fill, numbers.Number):
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fill = self.palette.getcolor(fill, self._image)
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result_fill = self.draw.draw_ink(fill)
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return result_ink, result_fill
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def arc(
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self,
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xy: Coords,
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start: float,
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end: float,
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fill: _Ink | None = None,
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width: int = 1,
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) -> None:
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"""Draw an arc."""
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ink, fill = self._getink(fill)
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if ink is not None:
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self.draw.draw_arc(xy, start, end, ink, width)
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def bitmap(
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self, xy: Sequence[int], bitmap: Image.Image, fill: _Ink | None = None
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) -> None:
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"""Draw a bitmap."""
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bitmap.load()
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ink, fill = self._getink(fill)
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if ink is None:
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ink = fill
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if ink is not None:
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self.draw.draw_bitmap(xy, bitmap.im, ink)
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def chord(
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self,
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xy: Coords,
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start: float,
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end: float,
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fill: _Ink | None = None,
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outline: _Ink | None = None,
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width: int = 1,
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) -> None:
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"""Draw a chord."""
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ink, fill_ink = self._getink(outline, fill)
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if fill_ink is not None:
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self.draw.draw_chord(xy, start, end, fill_ink, 1)
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if ink is not None and ink != fill_ink and width != 0:
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self.draw.draw_chord(xy, start, end, ink, 0, width)
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def ellipse(
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self,
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xy: Coords,
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fill: _Ink | None = None,
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outline: _Ink | None = None,
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width: int = 1,
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) -> None:
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"""Draw an ellipse."""
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ink, fill_ink = self._getink(outline, fill)
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if fill_ink is not None:
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self.draw.draw_ellipse(xy, fill_ink, 1)
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if ink is not None and ink != fill_ink and width != 0:
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self.draw.draw_ellipse(xy, ink, 0, width)
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def circle(
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self,
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xy: Sequence[float],
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radius: float,
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fill: _Ink | None = None,
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outline: _Ink | None = None,
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width: int = 1,
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) -> None:
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"""Draw a circle given center coordinates and a radius."""
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ellipse_xy = (xy[0] - radius, xy[1] - radius, xy[0] + radius, xy[1] + radius)
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self.ellipse(ellipse_xy, fill, outline, width)
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def line(
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self,
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xy: Coords,
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fill: _Ink | None = None,
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width: int = 0,
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joint: str | None = None,
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) -> None:
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"""Draw a line, or a connected sequence of line segments."""
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ink = self._getink(fill)[0]
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if ink is not None:
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self.draw.draw_lines(xy, ink, width)
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if joint == "curve" and width > 4:
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points: Sequence[Sequence[float]]
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if isinstance(xy[0], (list, tuple)):
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points = cast(Sequence[Sequence[float]], xy)
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else:
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points = [
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cast(Sequence[float], tuple(xy[i : i + 2]))
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for i in range(0, len(xy), 2)
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]
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for i in range(1, len(points) - 1):
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point = points[i]
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angles = [
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math.degrees(math.atan2(end[0] - start[0], start[1] - end[1]))
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% 360
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for start, end in (
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(points[i - 1], point),
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(point, points[i + 1]),
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)
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]
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if angles[0] == angles[1]:
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# This is a straight line, so no joint is required
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continue
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def coord_at_angle(
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coord: Sequence[float], angle: float
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) -> tuple[float, ...]:
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x, y = coord
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angle -= 90
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distance = width / 2 - 1
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return tuple(
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p + (math.floor(p_d) if p_d > 0 else math.ceil(p_d))
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for p, p_d in (
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(x, distance * math.cos(math.radians(angle))),
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(y, distance * math.sin(math.radians(angle))),
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)
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)
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flipped = (
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angles[1] > angles[0] and angles[1] - 180 > angles[0]
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) or (angles[1] < angles[0] and angles[1] + 180 > angles[0])
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coords = [
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(point[0] - width / 2 + 1, point[1] - width / 2 + 1),
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(point[0] + width / 2 - 1, point[1] + width / 2 - 1),
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]
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if flipped:
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start, end = (angles[1] + 90, angles[0] + 90)
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else:
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start, end = (angles[0] - 90, angles[1] - 90)
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self.pieslice(coords, start - 90, end - 90, fill)
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if width > 8:
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# Cover potential gaps between the line and the joint
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if flipped:
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gap_coords = [
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coord_at_angle(point, angles[0] + 90),
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point,
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coord_at_angle(point, angles[1] + 90),
|
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]
|
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else:
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gap_coords = [
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coord_at_angle(point, angles[0] - 90),
|
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point,
|
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coord_at_angle(point, angles[1] - 90),
|
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]
|
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self.line(gap_coords, fill, width=3)
|
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|||
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def shape(
|
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self,
|
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shape: Image.core._Outline,
|
|||
|
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fill: _Ink | None = None,
|
|||
|
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outline: _Ink | None = None,
|
|||
|
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) -> None:
|
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"""(Experimental) Draw a shape."""
|
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shape.close()
|
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|
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ink, fill_ink = self._getink(outline, fill)
|
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|
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if fill_ink is not None:
|
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|
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self.draw.draw_outline(shape, fill_ink, 1)
|
|||
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if ink is not None and ink != fill_ink:
|
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self.draw.draw_outline(shape, ink, 0)
|
|||
|
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|
|||
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def pieslice(
|
|||
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|
self,
|
|||
|
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xy: Coords,
|
|||
|
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start: float,
|
|||
|
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end: float,
|
|||
|
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fill: _Ink | None = None,
|
|||
|
|
outline: _Ink | None = None,
|
|||
|
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width: int = 1,
|
|||
|
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) -> None:
|
|||
|
|
"""Draw a pieslice."""
|
|||
|
|
ink, fill_ink = self._getink(outline, fill)
|
|||
|
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if fill_ink is not None:
|
|||
|
|
self.draw.draw_pieslice(xy, start, end, fill_ink, 1)
|
|||
|
|
if ink is not None and ink != fill_ink and width != 0:
|
|||
|
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self.draw.draw_pieslice(xy, start, end, ink, 0, width)
|
|||
|
|
|
|||
|
|
def point(self, xy: Coords, fill: _Ink | None = None) -> None:
|
|||
|
|
"""Draw one or more individual pixels."""
|
|||
|
|
ink, fill = self._getink(fill)
|
|||
|
|
if ink is not None:
|
|||
|
|
self.draw.draw_points(xy, ink)
|
|||
|
|
|
|||
|
|
def polygon(
|
|||
|
|
self,
|
|||
|
|
xy: Coords,
|
|||
|
|
fill: _Ink | None = None,
|
|||
|
|
outline: _Ink | None = None,
|
|||
|
|
width: int = 1,
|
|||
|
|
) -> None:
|
|||
|
|
"""Draw a polygon."""
|
|||
|
|
ink, fill_ink = self._getink(outline, fill)
|
|||
|
|
if fill_ink is not None:
|
|||
|
|
self.draw.draw_polygon(xy, fill_ink, 1)
|
|||
|
|
if ink is not None and ink != fill_ink and width != 0:
|
|||
|
|
if width == 1:
|
|||
|
|
self.draw.draw_polygon(xy, ink, 0, width)
|
|||
|
|
elif self.im is not None:
|
|||
|
|
# To avoid expanding the polygon outwards,
|
|||
|
|
# use the fill as a mask
|
|||
|
|
mask = Image.new("1", self.im.size)
|
|||
|
|
mask_ink = self._getink(1)[0]
|
|||
|
|
|
|||
|
|
fill_im = mask.copy()
|
|||
|
|
draw = Draw(fill_im)
|
|||
|
|
draw.draw.draw_polygon(xy, mask_ink, 1)
|
|||
|
|
|
|||
|
|
ink_im = mask.copy()
|
|||
|
|
draw = Draw(ink_im)
|
|||
|
|
width = width * 2 - 1
|
|||
|
|
draw.draw.draw_polygon(xy, mask_ink, 0, width)
|
|||
|
|
|
|||
|
|
mask.paste(ink_im, mask=fill_im)
|
|||
|
|
|
|||
|
|
im = Image.new(self.mode, self.im.size)
|
|||
|
|
draw = Draw(im)
|
|||
|
|
draw.draw.draw_polygon(xy, ink, 0, width)
|
|||
|
|
self.im.paste(im.im, (0, 0) + im.size, mask.im)
|
|||
|
|
|
|||
|
|
def regular_polygon(
|
|||
|
|
self,
|
|||
|
|
bounding_circle: Sequence[Sequence[float] | float],
|
|||
|
|
n_sides: int,
|
|||
|
|
rotation: float = 0,
|
|||
|
|
fill: _Ink | None = None,
|
|||
|
|
outline: _Ink | None = None,
|
|||
|
|
width: int = 1,
|
|||
|
|
) -> None:
|
|||
|
|
"""Draw a regular polygon."""
|
|||
|
|
xy = _compute_regular_polygon_vertices(bounding_circle, n_sides, rotation)
|
|||
|
|
self.polygon(xy, fill, outline, width)
|
|||
|
|
|
|||
|
|
def rectangle(
|
|||
|
|
self,
|
|||
|
|
xy: Coords,
|
|||
|
|
fill: _Ink | None = None,
|
|||
|
|
outline: _Ink | None = None,
|
|||
|
|
width: int = 1,
|
|||
|
|
) -> None:
|
|||
|
|
"""Draw a rectangle."""
|
|||
|
|
ink, fill_ink = self._getink(outline, fill)
|
|||
|
|
if fill_ink is not None:
|
|||
|
|
self.draw.draw_rectangle(xy, fill_ink, 1)
|
|||
|
|
if ink is not None and ink != fill_ink and width != 0:
|
|||
|
|
self.draw.draw_rectangle(xy, ink, 0, width)
|
|||
|
|
|
|||
|
|
def rounded_rectangle(
|
|||
|
|
self,
|
|||
|
|
xy: Coords,
|
|||
|
|
radius: float = 0,
|
|||
|
|
fill: _Ink | None = None,
|
|||
|
|
outline: _Ink | None = None,
|
|||
|
|
width: int = 1,
|
|||
|
|
*,
|
|||
|
|
corners: tuple[bool, bool, bool, bool] | None = None,
|
|||
|
|
) -> None:
|
|||
|
|
"""Draw a rounded rectangle."""
|
|||
|
|
if isinstance(xy[0], (list, tuple)):
|
|||
|
|
(x0, y0), (x1, y1) = cast(Sequence[Sequence[float]], xy)
|
|||
|
|
else:
|
|||
|
|
x0, y0, x1, y1 = cast(Sequence[float], xy)
|
|||
|
|
if x1 < x0:
|
|||
|
|
msg = "x1 must be greater than or equal to x0"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
if y1 < y0:
|
|||
|
|
msg = "y1 must be greater than or equal to y0"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
if corners is None:
|
|||
|
|
corners = (True, True, True, True)
|
|||
|
|
|
|||
|
|
d = radius * 2
|
|||
|
|
|
|||
|
|
x0 = round(x0)
|
|||
|
|
y0 = round(y0)
|
|||
|
|
x1 = round(x1)
|
|||
|
|
y1 = round(y1)
|
|||
|
|
full_x, full_y = False, False
|
|||
|
|
if all(corners):
|
|||
|
|
full_x = d >= x1 - x0 - 1
|
|||
|
|
if full_x:
|
|||
|
|
# The two left and two right corners are joined
|
|||
|
|
d = x1 - x0
|
|||
|
|
full_y = d >= y1 - y0 - 1
|
|||
|
|
if full_y:
|
|||
|
|
# The two top and two bottom corners are joined
|
|||
|
|
d = y1 - y0
|
|||
|
|
if full_x and full_y:
|
|||
|
|
# If all corners are joined, that is a circle
|
|||
|
|
return self.ellipse(xy, fill, outline, width)
|
|||
|
|
|
|||
|
|
if d == 0 or not any(corners):
|
|||
|
|
# If the corners have no curve,
|
|||
|
|
# or there are no corners,
|
|||
|
|
# that is a rectangle
|
|||
|
|
return self.rectangle(xy, fill, outline, width)
|
|||
|
|
|
|||
|
|
r = int(d // 2)
|
|||
|
|
ink, fill_ink = self._getink(outline, fill)
|
|||
|
|
|
|||
|
|
def draw_corners(pieslice: bool) -> None:
|
|||
|
|
parts: tuple[tuple[tuple[float, float, float, float], int, int], ...]
|
|||
|
|
if full_x:
|
|||
|
|
# Draw top and bottom halves
|
|||
|
|
parts = (
|
|||
|
|
((x0, y0, x0 + d, y0 + d), 180, 360),
|
|||
|
|
((x0, y1 - d, x0 + d, y1), 0, 180),
|
|||
|
|
)
|
|||
|
|
elif full_y:
|
|||
|
|
# Draw left and right halves
|
|||
|
|
parts = (
|
|||
|
|
((x0, y0, x0 + d, y0 + d), 90, 270),
|
|||
|
|
((x1 - d, y0, x1, y0 + d), 270, 90),
|
|||
|
|
)
|
|||
|
|
else:
|
|||
|
|
# Draw four separate corners
|
|||
|
|
parts = tuple(
|
|||
|
|
part
|
|||
|
|
for i, part in enumerate(
|
|||
|
|
(
|
|||
|
|
((x0, y0, x0 + d, y0 + d), 180, 270),
|
|||
|
|
((x1 - d, y0, x1, y0 + d), 270, 360),
|
|||
|
|
((x1 - d, y1 - d, x1, y1), 0, 90),
|
|||
|
|
((x0, y1 - d, x0 + d, y1), 90, 180),
|
|||
|
|
)
|
|||
|
|
)
|
|||
|
|
if corners[i]
|
|||
|
|
)
|
|||
|
|
for part in parts:
|
|||
|
|
if pieslice:
|
|||
|
|
self.draw.draw_pieslice(*(part + (fill_ink, 1)))
|
|||
|
|
else:
|
|||
|
|
self.draw.draw_arc(*(part + (ink, width)))
|
|||
|
|
|
|||
|
|
if fill_ink is not None:
|
|||
|
|
draw_corners(True)
|
|||
|
|
|
|||
|
|
if full_x:
|
|||
|
|
self.draw.draw_rectangle((x0, y0 + r + 1, x1, y1 - r - 1), fill_ink, 1)
|
|||
|
|
else:
|
|||
|
|
self.draw.draw_rectangle((x0 + r + 1, y0, x1 - r - 1, y1), fill_ink, 1)
|
|||
|
|
if not full_x and not full_y:
|
|||
|
|
left = [x0, y0, x0 + r, y1]
|
|||
|
|
if corners[0]:
|
|||
|
|
left[1] += r + 1
|
|||
|
|
if corners[3]:
|
|||
|
|
left[3] -= r + 1
|
|||
|
|
self.draw.draw_rectangle(left, fill_ink, 1)
|
|||
|
|
|
|||
|
|
right = [x1 - r, y0, x1, y1]
|
|||
|
|
if corners[1]:
|
|||
|
|
right[1] += r + 1
|
|||
|
|
if corners[2]:
|
|||
|
|
right[3] -= r + 1
|
|||
|
|
self.draw.draw_rectangle(right, fill_ink, 1)
|
|||
|
|
if ink is not None and ink != fill_ink and width != 0:
|
|||
|
|
draw_corners(False)
|
|||
|
|
|
|||
|
|
if not full_x:
|
|||
|
|
top = [x0, y0, x1, y0 + width - 1]
|
|||
|
|
if corners[0]:
|
|||
|
|
top[0] += r + 1
|
|||
|
|
if corners[1]:
|
|||
|
|
top[2] -= r + 1
|
|||
|
|
self.draw.draw_rectangle(top, ink, 1)
|
|||
|
|
|
|||
|
|
bottom = [x0, y1 - width + 1, x1, y1]
|
|||
|
|
if corners[3]:
|
|||
|
|
bottom[0] += r + 1
|
|||
|
|
if corners[2]:
|
|||
|
|
bottom[2] -= r + 1
|
|||
|
|
self.draw.draw_rectangle(bottom, ink, 1)
|
|||
|
|
if not full_y:
|
|||
|
|
left = [x0, y0, x0 + width - 1, y1]
|
|||
|
|
if corners[0]:
|
|||
|
|
left[1] += r + 1
|
|||
|
|
if corners[3]:
|
|||
|
|
left[3] -= r + 1
|
|||
|
|
self.draw.draw_rectangle(left, ink, 1)
|
|||
|
|
|
|||
|
|
right = [x1 - width + 1, y0, x1, y1]
|
|||
|
|
if corners[1]:
|
|||
|
|
right[1] += r + 1
|
|||
|
|
if corners[2]:
|
|||
|
|
right[3] -= r + 1
|
|||
|
|
self.draw.draw_rectangle(right, ink, 1)
|
|||
|
|
|
|||
|
|
def _multiline_check(self, text: AnyStr) -> bool:
|
|||
|
|
split_character = "\n" if isinstance(text, str) else b"\n"
|
|||
|
|
|
|||
|
|
return split_character in text
|
|||
|
|
|
|||
|
|
def _multiline_split(self, text: AnyStr) -> list[AnyStr]:
|
|||
|
|
return text.split("\n" if isinstance(text, str) else b"\n")
|
|||
|
|
|
|||
|
|
def _multiline_spacing(self, font, spacing, stroke_width):
|
|||
|
|
return (
|
|||
|
|
self.textbbox((0, 0), "A", font, stroke_width=stroke_width)[3]
|
|||
|
|
+ stroke_width
|
|||
|
|
+ spacing
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
def text(
|
|||
|
|
self,
|
|||
|
|
xy: tuple[float, float],
|
|||
|
|
text: str,
|
|||
|
|
fill=None,
|
|||
|
|
font: (
|
|||
|
|
ImageFont.ImageFont
|
|||
|
|
| ImageFont.FreeTypeFont
|
|||
|
|
| ImageFont.TransposedFont
|
|||
|
|
| None
|
|||
|
|
) = None,
|
|||
|
|
anchor=None,
|
|||
|
|
spacing=4,
|
|||
|
|
align="left",
|
|||
|
|
direction=None,
|
|||
|
|
features=None,
|
|||
|
|
language=None,
|
|||
|
|
stroke_width=0,
|
|||
|
|
stroke_fill=None,
|
|||
|
|
embedded_color=False,
|
|||
|
|
*args,
|
|||
|
|
**kwargs,
|
|||
|
|
) -> None:
|
|||
|
|
"""Draw text."""
|
|||
|
|
if embedded_color and self.mode not in ("RGB", "RGBA"):
|
|||
|
|
msg = "Embedded color supported only in RGB and RGBA modes"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if font is None:
|
|||
|
|
font = self._getfont(kwargs.get("font_size"))
|
|||
|
|
|
|||
|
|
if self._multiline_check(text):
|
|||
|
|
return self.multiline_text(
|
|||
|
|
xy,
|
|||
|
|
text,
|
|||
|
|
fill,
|
|||
|
|
font,
|
|||
|
|
anchor,
|
|||
|
|
spacing,
|
|||
|
|
align,
|
|||
|
|
direction,
|
|||
|
|
features,
|
|||
|
|
language,
|
|||
|
|
stroke_width,
|
|||
|
|
stroke_fill,
|
|||
|
|
embedded_color,
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
def getink(fill: _Ink | None) -> int:
|
|||
|
|
ink, fill_ink = self._getink(fill)
|
|||
|
|
if ink is None:
|
|||
|
|
assert fill_ink is not None
|
|||
|
|
return fill_ink
|
|||
|
|
return ink
|
|||
|
|
|
|||
|
|
def draw_text(ink, stroke_width=0, stroke_offset=None) -> None:
|
|||
|
|
mode = self.fontmode
|
|||
|
|
if stroke_width == 0 and embedded_color:
|
|||
|
|
mode = "RGBA"
|
|||
|
|
coord = []
|
|||
|
|
start = []
|
|||
|
|
for i in range(2):
|
|||
|
|
coord.append(int(xy[i]))
|
|||
|
|
start.append(math.modf(xy[i])[0])
|
|||
|
|
try:
|
|||
|
|
mask, offset = font.getmask2( # type: ignore[union-attr,misc]
|
|||
|
|
text,
|
|||
|
|
mode,
|
|||
|
|
direction=direction,
|
|||
|
|
features=features,
|
|||
|
|
language=language,
|
|||
|
|
stroke_width=stroke_width,
|
|||
|
|
anchor=anchor,
|
|||
|
|
ink=ink,
|
|||
|
|
start=start,
|
|||
|
|
*args,
|
|||
|
|
**kwargs,
|
|||
|
|
)
|
|||
|
|
coord = [coord[0] + offset[0], coord[1] + offset[1]]
|
|||
|
|
except AttributeError:
|
|||
|
|
try:
|
|||
|
|
mask = font.getmask( # type: ignore[misc]
|
|||
|
|
text,
|
|||
|
|
mode,
|
|||
|
|
direction,
|
|||
|
|
features,
|
|||
|
|
language,
|
|||
|
|
stroke_width,
|
|||
|
|
anchor,
|
|||
|
|
ink,
|
|||
|
|
start=start,
|
|||
|
|
*args,
|
|||
|
|
**kwargs,
|
|||
|
|
)
|
|||
|
|
except TypeError:
|
|||
|
|
mask = font.getmask(text)
|
|||
|
|
if stroke_offset:
|
|||
|
|
coord = [coord[0] + stroke_offset[0], coord[1] + stroke_offset[1]]
|
|||
|
|
if mode == "RGBA":
|
|||
|
|
# font.getmask2(mode="RGBA") returns color in RGB bands and mask in A
|
|||
|
|
# extract mask and set text alpha
|
|||
|
|
color, mask = mask, mask.getband(3)
|
|||
|
|
ink_alpha = struct.pack("i", ink)[3]
|
|||
|
|
color.fillband(3, ink_alpha)
|
|||
|
|
x, y = coord
|
|||
|
|
if self.im is not None:
|
|||
|
|
self.im.paste(
|
|||
|
|
color, (x, y, x + mask.size[0], y + mask.size[1]), mask
|
|||
|
|
)
|
|||
|
|
else:
|
|||
|
|
self.draw.draw_bitmap(coord, mask, ink)
|
|||
|
|
|
|||
|
|
ink = getink(fill)
|
|||
|
|
if ink is not None:
|
|||
|
|
stroke_ink = None
|
|||
|
|
if stroke_width:
|
|||
|
|
stroke_ink = getink(stroke_fill) if stroke_fill is not None else ink
|
|||
|
|
|
|||
|
|
if stroke_ink is not None:
|
|||
|
|
# Draw stroked text
|
|||
|
|
draw_text(stroke_ink, stroke_width)
|
|||
|
|
|
|||
|
|
# Draw normal text
|
|||
|
|
draw_text(ink, 0)
|
|||
|
|
else:
|
|||
|
|
# Only draw normal text
|
|||
|
|
draw_text(ink)
|
|||
|
|
|
|||
|
|
def multiline_text(
|
|||
|
|
self,
|
|||
|
|
xy: tuple[float, float],
|
|||
|
|
text: str,
|
|||
|
|
fill=None,
|
|||
|
|
font: (
|
|||
|
|
ImageFont.ImageFont
|
|||
|
|
| ImageFont.FreeTypeFont
|
|||
|
|
| ImageFont.TransposedFont
|
|||
|
|
| None
|
|||
|
|
) = None,
|
|||
|
|
anchor=None,
|
|||
|
|
spacing=4,
|
|||
|
|
align="left",
|
|||
|
|
direction=None,
|
|||
|
|
features=None,
|
|||
|
|
language=None,
|
|||
|
|
stroke_width=0,
|
|||
|
|
stroke_fill=None,
|
|||
|
|
embedded_color=False,
|
|||
|
|
*,
|
|||
|
|
font_size=None,
|
|||
|
|
) -> None:
|
|||
|
|
if direction == "ttb":
|
|||
|
|
msg = "ttb direction is unsupported for multiline text"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if anchor is None:
|
|||
|
|
anchor = "la"
|
|||
|
|
elif len(anchor) != 2:
|
|||
|
|
msg = "anchor must be a 2 character string"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
elif anchor[1] in "tb":
|
|||
|
|
msg = "anchor not supported for multiline text"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if font is None:
|
|||
|
|
font = self._getfont(font_size)
|
|||
|
|
|
|||
|
|
widths = []
|
|||
|
|
max_width: float = 0
|
|||
|
|
lines = self._multiline_split(text)
|
|||
|
|
line_spacing = self._multiline_spacing(font, spacing, stroke_width)
|
|||
|
|
for line in lines:
|
|||
|
|
line_width = self.textlength(
|
|||
|
|
line, font, direction=direction, features=features, language=language
|
|||
|
|
)
|
|||
|
|
widths.append(line_width)
|
|||
|
|
max_width = max(max_width, line_width)
|
|||
|
|
|
|||
|
|
top = xy[1]
|
|||
|
|
if anchor[1] == "m":
|
|||
|
|
top -= (len(lines) - 1) * line_spacing / 2.0
|
|||
|
|
elif anchor[1] == "d":
|
|||
|
|
top -= (len(lines) - 1) * line_spacing
|
|||
|
|
|
|||
|
|
for idx, line in enumerate(lines):
|
|||
|
|
left = xy[0]
|
|||
|
|
width_difference = max_width - widths[idx]
|
|||
|
|
|
|||
|
|
# first align left by anchor
|
|||
|
|
if anchor[0] == "m":
|
|||
|
|
left -= width_difference / 2.0
|
|||
|
|
elif anchor[0] == "r":
|
|||
|
|
left -= width_difference
|
|||
|
|
|
|||
|
|
# then align by align parameter
|
|||
|
|
if align == "left":
|
|||
|
|
pass
|
|||
|
|
elif align == "center":
|
|||
|
|
left += width_difference / 2.0
|
|||
|
|
elif align == "right":
|
|||
|
|
left += width_difference
|
|||
|
|
else:
|
|||
|
|
msg = 'align must be "left", "center" or "right"'
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
self.text(
|
|||
|
|
(left, top),
|
|||
|
|
line,
|
|||
|
|
fill,
|
|||
|
|
font,
|
|||
|
|
anchor,
|
|||
|
|
direction=direction,
|
|||
|
|
features=features,
|
|||
|
|
language=language,
|
|||
|
|
stroke_width=stroke_width,
|
|||
|
|
stroke_fill=stroke_fill,
|
|||
|
|
embedded_color=embedded_color,
|
|||
|
|
)
|
|||
|
|
top += line_spacing
|
|||
|
|
|
|||
|
|
def textlength(
|
|||
|
|
self,
|
|||
|
|
text: str,
|
|||
|
|
font: (
|
|||
|
|
ImageFont.ImageFont
|
|||
|
|
| ImageFont.FreeTypeFont
|
|||
|
|
| ImageFont.TransposedFont
|
|||
|
|
| None
|
|||
|
|
) = None,
|
|||
|
|
direction=None,
|
|||
|
|
features=None,
|
|||
|
|
language=None,
|
|||
|
|
embedded_color=False,
|
|||
|
|
*,
|
|||
|
|
font_size=None,
|
|||
|
|
) -> float:
|
|||
|
|
"""Get the length of a given string, in pixels with 1/64 precision."""
|
|||
|
|
if self._multiline_check(text):
|
|||
|
|
msg = "can't measure length of multiline text"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
if embedded_color and self.mode not in ("RGB", "RGBA"):
|
|||
|
|
msg = "Embedded color supported only in RGB and RGBA modes"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if font is None:
|
|||
|
|
font = self._getfont(font_size)
|
|||
|
|
mode = "RGBA" if embedded_color else self.fontmode
|
|||
|
|
return font.getlength(text, mode, direction, features, language)
|
|||
|
|
|
|||
|
|
def textbbox(
|
|||
|
|
self,
|
|||
|
|
xy,
|
|||
|
|
text,
|
|||
|
|
font=None,
|
|||
|
|
anchor=None,
|
|||
|
|
spacing=4,
|
|||
|
|
align="left",
|
|||
|
|
direction=None,
|
|||
|
|
features=None,
|
|||
|
|
language=None,
|
|||
|
|
stroke_width=0,
|
|||
|
|
embedded_color=False,
|
|||
|
|
*,
|
|||
|
|
font_size=None,
|
|||
|
|
) -> tuple[int, int, int, int]:
|
|||
|
|
"""Get the bounding box of a given string, in pixels."""
|
|||
|
|
if embedded_color and self.mode not in ("RGB", "RGBA"):
|
|||
|
|
msg = "Embedded color supported only in RGB and RGBA modes"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if font is None:
|
|||
|
|
font = self._getfont(font_size)
|
|||
|
|
|
|||
|
|
if self._multiline_check(text):
|
|||
|
|
return self.multiline_textbbox(
|
|||
|
|
xy,
|
|||
|
|
text,
|
|||
|
|
font,
|
|||
|
|
anchor,
|
|||
|
|
spacing,
|
|||
|
|
align,
|
|||
|
|
direction,
|
|||
|
|
features,
|
|||
|
|
language,
|
|||
|
|
stroke_width,
|
|||
|
|
embedded_color,
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
mode = "RGBA" if embedded_color else self.fontmode
|
|||
|
|
bbox = font.getbbox(
|
|||
|
|
text, mode, direction, features, language, stroke_width, anchor
|
|||
|
|
)
|
|||
|
|
return bbox[0] + xy[0], bbox[1] + xy[1], bbox[2] + xy[0], bbox[3] + xy[1]
|
|||
|
|
|
|||
|
|
def multiline_textbbox(
|
|||
|
|
self,
|
|||
|
|
xy,
|
|||
|
|
text,
|
|||
|
|
font=None,
|
|||
|
|
anchor=None,
|
|||
|
|
spacing=4,
|
|||
|
|
align="left",
|
|||
|
|
direction=None,
|
|||
|
|
features=None,
|
|||
|
|
language=None,
|
|||
|
|
stroke_width=0,
|
|||
|
|
embedded_color=False,
|
|||
|
|
*,
|
|||
|
|
font_size=None,
|
|||
|
|
) -> tuple[int, int, int, int]:
|
|||
|
|
if direction == "ttb":
|
|||
|
|
msg = "ttb direction is unsupported for multiline text"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if anchor is None:
|
|||
|
|
anchor = "la"
|
|||
|
|
elif len(anchor) != 2:
|
|||
|
|
msg = "anchor must be a 2 character string"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
elif anchor[1] in "tb":
|
|||
|
|
msg = "anchor not supported for multiline text"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if font is None:
|
|||
|
|
font = self._getfont(font_size)
|
|||
|
|
|
|||
|
|
widths = []
|
|||
|
|
max_width: float = 0
|
|||
|
|
lines = self._multiline_split(text)
|
|||
|
|
line_spacing = self._multiline_spacing(font, spacing, stroke_width)
|
|||
|
|
for line in lines:
|
|||
|
|
line_width = self.textlength(
|
|||
|
|
line,
|
|||
|
|
font,
|
|||
|
|
direction=direction,
|
|||
|
|
features=features,
|
|||
|
|
language=language,
|
|||
|
|
embedded_color=embedded_color,
|
|||
|
|
)
|
|||
|
|
widths.append(line_width)
|
|||
|
|
max_width = max(max_width, line_width)
|
|||
|
|
|
|||
|
|
top = xy[1]
|
|||
|
|
if anchor[1] == "m":
|
|||
|
|
top -= (len(lines) - 1) * line_spacing / 2.0
|
|||
|
|
elif anchor[1] == "d":
|
|||
|
|
top -= (len(lines) - 1) * line_spacing
|
|||
|
|
|
|||
|
|
bbox: tuple[int, int, int, int] | None = None
|
|||
|
|
|
|||
|
|
for idx, line in enumerate(lines):
|
|||
|
|
left = xy[0]
|
|||
|
|
width_difference = max_width - widths[idx]
|
|||
|
|
|
|||
|
|
# first align left by anchor
|
|||
|
|
if anchor[0] == "m":
|
|||
|
|
left -= width_difference / 2.0
|
|||
|
|
elif anchor[0] == "r":
|
|||
|
|
left -= width_difference
|
|||
|
|
|
|||
|
|
# then align by align parameter
|
|||
|
|
if align == "left":
|
|||
|
|
pass
|
|||
|
|
elif align == "center":
|
|||
|
|
left += width_difference / 2.0
|
|||
|
|
elif align == "right":
|
|||
|
|
left += width_difference
|
|||
|
|
else:
|
|||
|
|
msg = 'align must be "left", "center" or "right"'
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
bbox_line = self.textbbox(
|
|||
|
|
(left, top),
|
|||
|
|
line,
|
|||
|
|
font,
|
|||
|
|
anchor,
|
|||
|
|
direction=direction,
|
|||
|
|
features=features,
|
|||
|
|
language=language,
|
|||
|
|
stroke_width=stroke_width,
|
|||
|
|
embedded_color=embedded_color,
|
|||
|
|
)
|
|||
|
|
if bbox is None:
|
|||
|
|
bbox = bbox_line
|
|||
|
|
else:
|
|||
|
|
bbox = (
|
|||
|
|
min(bbox[0], bbox_line[0]),
|
|||
|
|
min(bbox[1], bbox_line[1]),
|
|||
|
|
max(bbox[2], bbox_line[2]),
|
|||
|
|
max(bbox[3], bbox_line[3]),
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
top += line_spacing
|
|||
|
|
|
|||
|
|
if bbox is None:
|
|||
|
|
return xy[0], xy[1], xy[0], xy[1]
|
|||
|
|
return bbox
|
|||
|
|
|
|||
|
|
|
|||
|
|
def Draw(im: Image.Image, mode: str | None = None) -> ImageDraw:
|
|||
|
|
"""
|
|||
|
|
A simple 2D drawing interface for PIL images.
|
|||
|
|
|
|||
|
|
:param im: The image to draw in.
|
|||
|
|
:param mode: Optional mode to use for color values. For RGB
|
|||
|
|
images, this argument can be RGB or RGBA (to blend the
|
|||
|
|
drawing into the image). For all other modes, this argument
|
|||
|
|
must be the same as the image mode. If omitted, the mode
|
|||
|
|
defaults to the mode of the image.
|
|||
|
|
"""
|
|||
|
|
try:
|
|||
|
|
return getattr(im, "getdraw")(mode)
|
|||
|
|
except AttributeError:
|
|||
|
|
return ImageDraw(im, mode)
|
|||
|
|
|
|||
|
|
|
|||
|
|
def getdraw(
|
|||
|
|
im: Image.Image | None = None, hints: list[str] | None = None
|
|||
|
|
) -> tuple[ImageDraw2.Draw | None, ModuleType]:
|
|||
|
|
"""
|
|||
|
|
:param im: The image to draw in.
|
|||
|
|
:param hints: An optional list of hints. Deprecated.
|
|||
|
|
:returns: A (drawing context, drawing resource factory) tuple.
|
|||
|
|
"""
|
|||
|
|
if hints is not None:
|
|||
|
|
deprecate("'hints' parameter", 12)
|
|||
|
|
from . import ImageDraw2
|
|||
|
|
|
|||
|
|
draw = ImageDraw2.Draw(im) if im is not None else None
|
|||
|
|
return draw, ImageDraw2
|
|||
|
|
|
|||
|
|
|
|||
|
|
def floodfill(
|
|||
|
|
image: Image.Image,
|
|||
|
|
xy: tuple[int, int],
|
|||
|
|
value: float | tuple[int, ...],
|
|||
|
|
border: float | tuple[int, ...] | None = None,
|
|||
|
|
thresh: float = 0,
|
|||
|
|
) -> None:
|
|||
|
|
"""
|
|||
|
|
.. warning:: This method is experimental.
|
|||
|
|
|
|||
|
|
Fills a bounded region with a given color.
|
|||
|
|
|
|||
|
|
:param image: Target image.
|
|||
|
|
:param xy: Seed position (a 2-item coordinate tuple). See
|
|||
|
|
:ref:`coordinate-system`.
|
|||
|
|
:param value: Fill color.
|
|||
|
|
:param border: Optional border value. If given, the region consists of
|
|||
|
|
pixels with a color different from the border color. If not given,
|
|||
|
|
the region consists of pixels having the same color as the seed
|
|||
|
|
pixel.
|
|||
|
|
:param thresh: Optional threshold value which specifies a maximum
|
|||
|
|
tolerable difference of a pixel value from the 'background' in
|
|||
|
|
order for it to be replaced. Useful for filling regions of
|
|||
|
|
non-homogeneous, but similar, colors.
|
|||
|
|
"""
|
|||
|
|
# based on an implementation by Eric S. Raymond
|
|||
|
|
# amended by yo1995 @20180806
|
|||
|
|
pixel = image.load()
|
|||
|
|
assert pixel is not None
|
|||
|
|
x, y = xy
|
|||
|
|
try:
|
|||
|
|
background = pixel[x, y]
|
|||
|
|
if _color_diff(value, background) <= thresh:
|
|||
|
|
return # seed point already has fill color
|
|||
|
|
pixel[x, y] = value
|
|||
|
|
except (ValueError, IndexError):
|
|||
|
|
return # seed point outside image
|
|||
|
|
edge = {(x, y)}
|
|||
|
|
# use a set to keep record of current and previous edge pixels
|
|||
|
|
# to reduce memory consumption
|
|||
|
|
full_edge = set()
|
|||
|
|
while edge:
|
|||
|
|
new_edge = set()
|
|||
|
|
for x, y in edge: # 4 adjacent method
|
|||
|
|
for s, t in ((x + 1, y), (x - 1, y), (x, y + 1), (x, y - 1)):
|
|||
|
|
# If already processed, or if a coordinate is negative, skip
|
|||
|
|
if (s, t) in full_edge or s < 0 or t < 0:
|
|||
|
|
continue
|
|||
|
|
try:
|
|||
|
|
p = pixel[s, t]
|
|||
|
|
except (ValueError, IndexError):
|
|||
|
|
pass
|
|||
|
|
else:
|
|||
|
|
full_edge.add((s, t))
|
|||
|
|
if border is None:
|
|||
|
|
fill = _color_diff(p, background) <= thresh
|
|||
|
|
else:
|
|||
|
|
fill = p not in (value, border)
|
|||
|
|
if fill:
|
|||
|
|
pixel[s, t] = value
|
|||
|
|
new_edge.add((s, t))
|
|||
|
|
full_edge = edge # discard pixels processed
|
|||
|
|
edge = new_edge
|
|||
|
|
|
|||
|
|
|
|||
|
|
def _compute_regular_polygon_vertices(
|
|||
|
|
bounding_circle: Sequence[Sequence[float] | float], n_sides: int, rotation: float
|
|||
|
|
) -> list[tuple[float, float]]:
|
|||
|
|
"""
|
|||
|
|
Generate a list of vertices for a 2D regular polygon.
|
|||
|
|
|
|||
|
|
:param bounding_circle: The bounding circle is a sequence defined
|
|||
|
|
by a point and radius. The polygon is inscribed in this circle.
|
|||
|
|
(e.g. ``bounding_circle=(x, y, r)`` or ``((x, y), r)``)
|
|||
|
|
:param n_sides: Number of sides
|
|||
|
|
(e.g. ``n_sides=3`` for a triangle, ``6`` for a hexagon)
|
|||
|
|
:param rotation: Apply an arbitrary rotation to the polygon
|
|||
|
|
(e.g. ``rotation=90``, applies a 90 degree rotation)
|
|||
|
|
:return: List of regular polygon vertices
|
|||
|
|
(e.g. ``[(25, 50), (50, 50), (50, 25), (25, 25)]``)
|
|||
|
|
|
|||
|
|
How are the vertices computed?
|
|||
|
|
1. Compute the following variables
|
|||
|
|
- theta: Angle between the apothem & the nearest polygon vertex
|
|||
|
|
- side_length: Length of each polygon edge
|
|||
|
|
- centroid: Center of bounding circle (1st, 2nd elements of bounding_circle)
|
|||
|
|
- polygon_radius: Polygon radius (last element of bounding_circle)
|
|||
|
|
- angles: Location of each polygon vertex in polar grid
|
|||
|
|
(e.g. A square with 0 degree rotation => [225.0, 315.0, 45.0, 135.0])
|
|||
|
|
|
|||
|
|
2. For each angle in angles, get the polygon vertex at that angle
|
|||
|
|
The vertex is computed using the equation below.
|
|||
|
|
X= xcos(φ) + ysin(φ)
|
|||
|
|
Y= −xsin(φ) + ycos(φ)
|
|||
|
|
|
|||
|
|
Note:
|
|||
|
|
φ = angle in degrees
|
|||
|
|
x = 0
|
|||
|
|
y = polygon_radius
|
|||
|
|
|
|||
|
|
The formula above assumes rotation around the origin.
|
|||
|
|
In our case, we are rotating around the centroid.
|
|||
|
|
To account for this, we use the formula below
|
|||
|
|
X = xcos(φ) + ysin(φ) + centroid_x
|
|||
|
|
Y = −xsin(φ) + ycos(φ) + centroid_y
|
|||
|
|
"""
|
|||
|
|
# 1. Error Handling
|
|||
|
|
# 1.1 Check `n_sides` has an appropriate value
|
|||
|
|
if not isinstance(n_sides, int):
|
|||
|
|
msg = "n_sides should be an int" # type: ignore[unreachable]
|
|||
|
|
raise TypeError(msg)
|
|||
|
|
if n_sides < 3:
|
|||
|
|
msg = "n_sides should be an int > 2"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
# 1.2 Check `bounding_circle` has an appropriate value
|
|||
|
|
if not isinstance(bounding_circle, (list, tuple)):
|
|||
|
|
msg = "bounding_circle should be a sequence"
|
|||
|
|
raise TypeError(msg)
|
|||
|
|
|
|||
|
|
if len(bounding_circle) == 3:
|
|||
|
|
if not all(isinstance(i, (int, float)) for i in bounding_circle):
|
|||
|
|
msg = "bounding_circle should only contain numeric data"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
*centroid, polygon_radius = cast(List[float], list(bounding_circle))
|
|||
|
|
elif len(bounding_circle) == 2 and isinstance(bounding_circle[0], (list, tuple)):
|
|||
|
|
if not all(
|
|||
|
|
isinstance(i, (int, float)) for i in bounding_circle[0]
|
|||
|
|
) or not isinstance(bounding_circle[1], (int, float)):
|
|||
|
|
msg = "bounding_circle should only contain numeric data"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if len(bounding_circle[0]) != 2:
|
|||
|
|
msg = "bounding_circle centre should contain 2D coordinates (e.g. (x, y))"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
centroid = cast(List[float], list(bounding_circle[0]))
|
|||
|
|
polygon_radius = cast(float, bounding_circle[1])
|
|||
|
|
else:
|
|||
|
|
msg = (
|
|||
|
|
"bounding_circle should contain 2D coordinates "
|
|||
|
|
"and a radius (e.g. (x, y, r) or ((x, y), r) )"
|
|||
|
|
)
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if polygon_radius <= 0:
|
|||
|
|
msg = "bounding_circle radius should be > 0"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
# 1.3 Check `rotation` has an appropriate value
|
|||
|
|
if not isinstance(rotation, (int, float)):
|
|||
|
|
msg = "rotation should be an int or float" # type: ignore[unreachable]
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
# 2. Define Helper Functions
|
|||
|
|
def _apply_rotation(point: list[float], degrees: float) -> tuple[float, float]:
|
|||
|
|
return (
|
|||
|
|
round(
|
|||
|
|
point[0] * math.cos(math.radians(360 - degrees))
|
|||
|
|
- point[1] * math.sin(math.radians(360 - degrees))
|
|||
|
|
+ centroid[0],
|
|||
|
|
2,
|
|||
|
|
),
|
|||
|
|
round(
|
|||
|
|
point[1] * math.cos(math.radians(360 - degrees))
|
|||
|
|
+ point[0] * math.sin(math.radians(360 - degrees))
|
|||
|
|
+ centroid[1],
|
|||
|
|
2,
|
|||
|
|
),
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
def _compute_polygon_vertex(angle: float) -> tuple[float, float]:
|
|||
|
|
start_point = [polygon_radius, 0]
|
|||
|
|
return _apply_rotation(start_point, angle)
|
|||
|
|
|
|||
|
|
def _get_angles(n_sides: int, rotation: float) -> list[float]:
|
|||
|
|
angles = []
|
|||
|
|
degrees = 360 / n_sides
|
|||
|
|
# Start with the bottom left polygon vertex
|
|||
|
|
current_angle = (270 - 0.5 * degrees) + rotation
|
|||
|
|
for _ in range(0, n_sides):
|
|||
|
|
angles.append(current_angle)
|
|||
|
|
current_angle += degrees
|
|||
|
|
if current_angle > 360:
|
|||
|
|
current_angle -= 360
|
|||
|
|
return angles
|
|||
|
|
|
|||
|
|
# 3. Variable Declarations
|
|||
|
|
angles = _get_angles(n_sides, rotation)
|
|||
|
|
|
|||
|
|
# 4. Compute Vertices
|
|||
|
|
return [_compute_polygon_vertex(angle) for angle in angles]
|
|||
|
|
|
|||
|
|
|
|||
|
|
def _color_diff(
|
|||
|
|
color1: float | tuple[int, ...], color2: float | tuple[int, ...]
|
|||
|
|
) -> float:
|
|||
|
|
"""
|
|||
|
|
Uses 1-norm distance to calculate difference between two values.
|
|||
|
|
"""
|
|||
|
|
first = color1 if isinstance(color1, tuple) else (color1,)
|
|||
|
|
second = color2 if isinstance(color2, tuple) else (color2,)
|
|||
|
|
|
|||
|
|
return sum(abs(first[i] - second[i]) for i in range(0, len(second)))
|