1088 lines
37 KiB
Python
1088 lines
37 KiB
Python
|
#
|
|||
|
|
# The Python Imaging Library
|
|||
|
|
# $Id$
|
|||
|
|
#
|
|||
|
|
# drawing interface operations
|
|||
|
|
#
|
|||
|
|
# History:
|
|||
|
|
# 1996-04-13 fl Created (experimental)
|
|||
|
|
# 1996-08-07 fl Filled polygons, ellipses.
|
|||
|
|
# 1996-08-13 fl Added text support
|
|||
|
|
# 1998-06-28 fl Handle I and F images
|
|||
|
|
# 1998-12-29 fl Added arc; use arc primitive to draw ellipses
|
|||
|
|
# 1999-01-10 fl Added shape stuff (experimental)
|
|||
|
|
# 1999-02-06 fl Added bitmap support
|
|||
|
|
# 1999-02-11 fl Changed all primitives to take options
|
|||
|
|
# 1999-02-20 fl Fixed backwards compatibility
|
|||
|
|
# 2000-10-12 fl Copy on write, when necessary
|
|||
|
|
# 2001-02-18 fl Use default ink for bitmap/text also in fill mode
|
|||
|
|
# 2002-10-24 fl Added support for CSS-style color strings
|
|||
|
|
# 2002-12-10 fl Added experimental support for RGBA-on-RGB drawing
|
|||
|
|
# 2002-12-11 fl Refactored low-level drawing API (work in progress)
|
|||
|
|
# 2004-08-26 fl Made Draw() a factory function, added getdraw() support
|
|||
|
|
# 2004-09-04 fl Added width support to line primitive
|
|||
|
|
# 2004-09-10 fl Added font mode handling
|
|||
|
|
# 2006-06-19 fl Added font bearing support (getmask2)
|
|||
|
|
#
|
|||
|
|
# Copyright (c) 1997-2006 by Secret Labs AB
|
|||
|
|
# Copyright (c) 1996-2006 by Fredrik Lundh
|
|||
|
|
#
|
|||
|
|
# See the README file for information on usage and redistribution.
|
|||
|
|
#
|
|||
|
|
from __future__ import annotations
|
|||
|
|
|
|||
|
|
import math
|
|||
|
|
import numbers
|
|||
|
|
import struct
|
|||
|
|
from typing import Sequence, cast
|
|||
|
|
|
|||
|
|
from . import Image, ImageColor
|
|||
|
|
from ._typing import Coords
|
|||
|
|
|
|||
|
|
"""
|
|||
|
|
A simple 2D drawing interface for PIL images.
|
|||
|
|
<p>
|
|||
|
|
Application code should use the <b>Draw</b> factory, instead of
|
|||
|
|
directly.
|
|||
|
|
"""
|
|||
|
|
|
|||
|
|
|
|||
|
|
class ImageDraw:
|
|||
|
|
font = None
|
|||
|
|
|
|||
|
|
def __init__(self, im: Image.Image, mode: str | None = None) -> None:
|
|||
|
|
"""
|
|||
|
|
Create a drawing instance.
|
|||
|
|
|
|||
|
|
: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.
|
|||
|
|
"""
|
|||
|
|
im.load()
|
|||
|
|
if im.readonly:
|
|||
|
|
im._copy() # make it writeable
|
|||
|
|
blend = 0
|
|||
|
|
if mode is None:
|
|||
|
|
mode = im.mode
|
|||
|
|
if mode != im.mode:
|
|||
|
|
if mode == "RGBA" and im.mode == "RGB":
|
|||
|
|
blend = 1
|
|||
|
|
else:
|
|||
|
|
msg = "mode mismatch"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
if mode == "P":
|
|||
|
|
self.palette = im.palette
|
|||
|
|
else:
|
|||
|
|
self.palette = None
|
|||
|
|
self._image = im
|
|||
|
|
self.im = im.im
|
|||
|
|
self.draw = Image.core.draw(self.im, blend)
|
|||
|
|
self.mode = mode
|
|||
|
|
if mode in ("I", "F"):
|
|||
|
|
self.ink = self.draw.draw_ink(1)
|
|||
|
|
else:
|
|||
|
|
self.ink = self.draw.draw_ink(-1)
|
|||
|
|
if mode in ("1", "P", "I", "F"):
|
|||
|
|
# FIXME: fix Fill2 to properly support matte for I+F images
|
|||
|
|
self.fontmode = "1"
|
|||
|
|
else:
|
|||
|
|
self.fontmode = "L" # aliasing is okay for other modes
|
|||
|
|
self.fill = False
|
|||
|
|
|
|||
|
|
def getfont(self):
|
|||
|
|
"""
|
|||
|
|
Get the current default font.
|
|||
|
|
|
|||
|
|
To set the default font for this ImageDraw instance::
|
|||
|
|
|
|||
|
|
from PIL import ImageDraw, ImageFont
|
|||
|
|
draw.font = ImageFont.truetype("Tests/fonts/FreeMono.ttf")
|
|||
|
|
|
|||
|
|
To set the default font for all future ImageDraw instances::
|
|||
|
|
|
|||
|
|
from PIL import ImageDraw, ImageFont
|
|||
|
|
ImageDraw.ImageDraw.font = ImageFont.truetype("Tests/fonts/FreeMono.ttf")
|
|||
|
|
|
|||
|
|
If the current default font is ``None``,
|
|||
|
|
it is initialized with ``ImageFont.load_default()``.
|
|||
|
|
|
|||
|
|
:returns: An image font."""
|
|||
|
|
if not self.font:
|
|||
|
|
# FIXME: should add a font repository
|
|||
|
|
from . import ImageFont
|
|||
|
|
|
|||
|
|
self.font = ImageFont.load_default()
|
|||
|
|
return self.font
|
|||
|
|
|
|||
|
|
def _getfont(self, font_size: float | None):
|
|||
|
|
if font_size is not None:
|
|||
|
|
from . import ImageFont
|
|||
|
|
|
|||
|
|
font = ImageFont.load_default(font_size)
|
|||
|
|
else:
|
|||
|
|
font = self.getfont()
|
|||
|
|
return font
|
|||
|
|
|
|||
|
|
def _getink(self, ink, fill=None) -> tuple[int | None, int | None]:
|
|||
|
|
if ink is None and fill is None:
|
|||
|
|
if self.fill:
|
|||
|
|
fill = self.ink
|
|||
|
|
else:
|
|||
|
|
ink = self.ink
|
|||
|
|
else:
|
|||
|
|
if ink is not None:
|
|||
|
|
if isinstance(ink, str):
|
|||
|
|
ink = ImageColor.getcolor(ink, self.mode)
|
|||
|
|
if self.palette and not isinstance(ink, numbers.Number):
|
|||
|
|
ink = self.palette.getcolor(ink, self._image)
|
|||
|
|
ink = self.draw.draw_ink(ink)
|
|||
|
|
if fill is not None:
|
|||
|
|
if isinstance(fill, str):
|
|||
|
|
fill = ImageColor.getcolor(fill, self.mode)
|
|||
|
|
if self.palette and not isinstance(fill, numbers.Number):
|
|||
|
|
fill = self.palette.getcolor(fill, self._image)
|
|||
|
|
fill = self.draw.draw_ink(fill)
|
|||
|
|
return ink, fill
|
|||
|
|
|
|||
|
|
def arc(self, xy: Coords, start, end, fill=None, width=1) -> None:
|
|||
|
|
"""Draw an arc."""
|
|||
|
|
ink, fill = self._getink(fill)
|
|||
|
|
if ink is not None:
|
|||
|
|
self.draw.draw_arc(xy, start, end, ink, width)
|
|||
|
|
|
|||
|
|
def bitmap(self, xy: Sequence[int], bitmap, fill=None) -> None:
|
|||
|
|
"""Draw a bitmap."""
|
|||
|
|
bitmap.load()
|
|||
|
|
ink, fill = self._getink(fill)
|
|||
|
|
if ink is None:
|
|||
|
|
ink = fill
|
|||
|
|
if ink is not None:
|
|||
|
|
self.draw.draw_bitmap(xy, bitmap.im, ink)
|
|||
|
|
|
|||
|
|
def chord(self, xy: Coords, start, end, fill=None, outline=None, width=1) -> None:
|
|||
|
|
"""Draw a chord."""
|
|||
|
|
ink, fill = self._getink(outline, fill)
|
|||
|
|
if fill is not None:
|
|||
|
|
self.draw.draw_chord(xy, start, end, fill, 1)
|
|||
|
|
if ink is not None and ink != fill and width != 0:
|
|||
|
|
self.draw.draw_chord(xy, start, end, ink, 0, width)
|
|||
|
|
|
|||
|
|
def ellipse(self, xy: Coords, fill=None, outline=None, width=1) -> None:
|
|||
|
|
"""Draw an ellipse."""
|
|||
|
|
ink, fill = self._getink(outline, fill)
|
|||
|
|
if fill is not None:
|
|||
|
|
self.draw.draw_ellipse(xy, fill, 1)
|
|||
|
|
if ink is not None and ink != fill and width != 0:
|
|||
|
|
self.draw.draw_ellipse(xy, ink, 0, width)
|
|||
|
|
|
|||
|
|
def line(self, xy: Coords, fill=None, width=0, joint=None) -> None:
|
|||
|
|
"""Draw a line, or a connected sequence of line segments."""
|
|||
|
|
ink = self._getink(fill)[0]
|
|||
|
|
if ink is not None:
|
|||
|
|
self.draw.draw_lines(xy, ink, width)
|
|||
|
|
if joint == "curve" and width > 4:
|
|||
|
|
points: Sequence[Sequence[float]]
|
|||
|
|
if isinstance(xy[0], (list, tuple)):
|
|||
|
|
points = cast(Sequence[Sequence[float]], xy)
|
|||
|
|
else:
|
|||
|
|
points = [
|
|||
|
|
cast(Sequence[float], tuple(xy[i : i + 2]))
|
|||
|
|
for i in range(0, len(xy), 2)
|
|||
|
|
]
|
|||
|
|
for i in range(1, len(points) - 1):
|
|||
|
|
point = points[i]
|
|||
|
|
angles = [
|
|||
|
|
math.degrees(math.atan2(end[0] - start[0], start[1] - end[1]))
|
|||
|
|
% 360
|
|||
|
|
for start, end in (
|
|||
|
|
(points[i - 1], point),
|
|||
|
|
(point, points[i + 1]),
|
|||
|
|
)
|
|||
|
|
]
|
|||
|
|
if angles[0] == angles[1]:
|
|||
|
|
# This is a straight line, so no joint is required
|
|||
|
|
continue
|
|||
|
|
|
|||
|
|
def coord_at_angle(coord, angle):
|
|||
|
|
x, y = coord
|
|||
|
|
angle -= 90
|
|||
|
|
distance = width / 2 - 1
|
|||
|
|
return tuple(
|
|||
|
|
p + (math.floor(p_d) if p_d > 0 else math.ceil(p_d))
|
|||
|
|
for p, p_d in (
|
|||
|
|
(x, distance * math.cos(math.radians(angle))),
|
|||
|
|
(y, distance * math.sin(math.radians(angle))),
|
|||
|
|
)
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
flipped = (
|
|||
|
|
angles[1] > angles[0] and angles[1] - 180 > angles[0]
|
|||
|
|
) or (angles[1] < angles[0] and angles[1] + 180 > angles[0])
|
|||
|
|
coords = [
|
|||
|
|
(point[0] - width / 2 + 1, point[1] - width / 2 + 1),
|
|||
|
|
(point[0] + width / 2 - 1, point[1] + width / 2 - 1),
|
|||
|
|
]
|
|||
|
|
if flipped:
|
|||
|
|
start, end = (angles[1] + 90, angles[0] + 90)
|
|||
|
|
else:
|
|||
|
|
start, end = (angles[0] - 90, angles[1] - 90)
|
|||
|
|
self.pieslice(coords, start - 90, end - 90, fill)
|
|||
|
|
|
|||
|
|
if width > 8:
|
|||
|
|
# Cover potential gaps between the line and the joint
|
|||
|
|
if flipped:
|
|||
|
|
gap_coords = [
|
|||
|
|
coord_at_angle(point, angles[0] + 90),
|
|||
|
|
point,
|
|||
|
|
coord_at_angle(point, angles[1] + 90),
|
|||
|
|
]
|
|||
|
|
else:
|
|||
|
|
gap_coords = [
|
|||
|
|
coord_at_angle(point, angles[0] - 90),
|
|||
|
|
point,
|
|||
|
|
coord_at_angle(point, angles[1] - 90),
|
|||
|
|
]
|
|||
|
|
self.line(gap_coords, fill, width=3)
|
|||
|
|
|
|||
|
|
def shape(self, shape, fill=None, outline=None) -> None:
|
|||
|
|
"""(Experimental) Draw a shape."""
|
|||
|
|
shape.close()
|
|||
|
|
ink, fill = self._getink(outline, fill)
|
|||
|
|
if fill is not None:
|
|||
|
|
self.draw.draw_outline(shape, fill, 1)
|
|||
|
|
if ink is not None and ink != fill:
|
|||
|
|
self.draw.draw_outline(shape, ink, 0)
|
|||
|
|
|
|||
|
|
def pieslice(
|
|||
|
|
self, xy: Coords, start, end, fill=None, outline=None, width=1
|
|||
|
|
) -> None:
|
|||
|
|
"""Draw a pieslice."""
|
|||
|
|
ink, fill = self._getink(outline, fill)
|
|||
|
|
if fill is not None:
|
|||
|
|
self.draw.draw_pieslice(xy, start, end, fill, 1)
|
|||
|
|
if ink is not None and ink != fill and width != 0:
|
|||
|
|
self.draw.draw_pieslice(xy, start, end, ink, 0, width)
|
|||
|
|
|
|||
|
|
def point(self, xy: Coords, fill=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=None, outline=None, width=1) -> None:
|
|||
|
|
"""Draw a polygon."""
|
|||
|
|
ink, fill = self._getink(outline, fill)
|
|||
|
|
if fill is not None:
|
|||
|
|
self.draw.draw_polygon(xy, fill, 1)
|
|||
|
|
if ink is not None and ink != fill 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, n_sides, rotation=0, fill=None, outline=None, width=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=None, outline=None, width=1) -> None:
|
|||
|
|
"""Draw a rectangle."""
|
|||
|
|
ink, fill = self._getink(outline, fill)
|
|||
|
|
if fill is not None:
|
|||
|
|
self.draw.draw_rectangle(xy, fill, 1)
|
|||
|
|
if ink is not None and ink != fill and width != 0:
|
|||
|
|
self.draw.draw_rectangle(xy, ink, 0, width)
|
|||
|
|
|
|||
|
|
def rounded_rectangle(
|
|||
|
|
self, xy: Coords, radius=0, fill=None, outline=None, width=1, *, corners=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 = d // 2
|
|||
|
|
ink, fill = self._getink(outline, fill)
|
|||
|
|
|
|||
|
|
def draw_corners(pieslice) -> 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, 1)))
|
|||
|
|
else:
|
|||
|
|
self.draw.draw_arc(*(part + (ink, width)))
|
|||
|
|
|
|||
|
|
if fill is not None:
|
|||
|
|
draw_corners(True)
|
|||
|
|
|
|||
|
|
if full_x:
|
|||
|
|
self.draw.draw_rectangle((x0, y0 + r + 1, x1, y1 - r - 1), fill, 1)
|
|||
|
|
else:
|
|||
|
|
self.draw.draw_rectangle((x0 + r + 1, y0, x1 - r - 1, y1), fill, 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, 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, 1)
|
|||
|
|
if ink is not None and ink != fill 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) -> bool:
|
|||
|
|
split_character = "\n" if isinstance(text, str) else b"\n"
|
|||
|
|
|
|||
|
|
return split_character in text
|
|||
|
|
|
|||
|
|
def _multiline_split(self, text) -> list[str | bytes]:
|
|||
|
|
split_character = "\n" if isinstance(text, str) else b"\n"
|
|||
|
|
|
|||
|
|
return text.split(split_character)
|
|||
|
|
|
|||
|
|
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,
|
|||
|
|
text,
|
|||
|
|
fill=None,
|
|||
|
|
font=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, fill = self._getink(fill)
|
|||
|
|
if ink is None:
|
|||
|
|
return fill
|
|||
|
|
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(
|
|||
|
|
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(
|
|||
|
|
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,
|
|||
|
|
text,
|
|||
|
|
fill=None,
|
|||
|
|
font=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 = 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,
|
|||
|
|
font=None,
|
|||
|
|
direction=None,
|
|||
|
|
features=None,
|
|||
|
|
language=None,
|
|||
|
|
embedded_color=False,
|
|||
|
|
*,
|
|||
|
|
font_size=None,
|
|||
|
|
):
|
|||
|
|
"""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 = 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, 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 im.getdraw(mode)
|
|||
|
|
except AttributeError:
|
|||
|
|
return ImageDraw(im, mode)
|
|||
|
|
|
|||
|
|
|
|||
|
|
# experimental access to the outline API
|
|||
|
|
try:
|
|||
|
|
Outline = Image.core.outline
|
|||
|
|
except AttributeError:
|
|||
|
|
Outline = None
|
|||
|
|
|
|||
|
|
|
|||
|
|
def getdraw(im=None, hints=None):
|
|||
|
|
"""
|
|||
|
|
(Experimental) A more advanced 2D drawing interface for PIL images,
|
|||
|
|
based on the WCK interface.
|
|||
|
|
|
|||
|
|
:param im: The image to draw in.
|
|||
|
|
:param hints: An optional list of hints.
|
|||
|
|
:returns: A (drawing context, drawing resource factory) tuple.
|
|||
|
|
"""
|
|||
|
|
# FIXME: this needs more work!
|
|||
|
|
# FIXME: come up with a better 'hints' scheme.
|
|||
|
|
handler = None
|
|||
|
|
if not hints or "nicest" in hints:
|
|||
|
|
try:
|
|||
|
|
from . import _imagingagg as handler
|
|||
|
|
except ImportError:
|
|||
|
|
pass
|
|||
|
|
if handler is None:
|
|||
|
|
from . import ImageDraw2 as handler
|
|||
|
|
if im:
|
|||
|
|
im = handler.Draw(im)
|
|||
|
|
return im, handler
|
|||
|
|
|
|||
|
|
|
|||
|
|
def floodfill(image: Image.Image, xy, value, border=None, thresh=0) -> None:
|
|||
|
|
"""
|
|||
|
|
(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()
|
|||
|
|
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, n_sides, rotation
|
|||
|
|
) -> list[tuple[float, float]]:
|
|||
|
|
"""
|
|||
|
|
Generate a list of vertices for a 2D regular polygon.
|
|||
|
|
|
|||
|
|
:param bounding_circle: The bounding circle is a tuple 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"
|
|||
|
|
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:
|
|||
|
|
*centroid, polygon_radius = bounding_circle
|
|||
|
|
elif len(bounding_circle) == 2:
|
|||
|
|
centroid, polygon_radius = bounding_circle
|
|||
|
|
else:
|
|||
|
|
msg = (
|
|||
|
|
"bounding_circle should contain 2D coordinates "
|
|||
|
|
"and a radius (e.g. (x, y, r) or ((x, y), r) )"
|
|||
|
|
)
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if not all(isinstance(i, (int, float)) for i in (*centroid, polygon_radius)):
|
|||
|
|
msg = "bounding_circle should only contain numeric data"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
if not len(centroid) == 2:
|
|||
|
|
msg = "bounding_circle centre should contain 2D coordinates (e.g. (x, y))"
|
|||
|
|
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"
|
|||
|
|
raise ValueError(msg)
|
|||
|
|
|
|||
|
|
# 2. Define Helper Functions
|
|||
|
|
def _apply_rotation(point: list[float], degrees: float) -> tuple[int, int]:
|
|||
|
|
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[int, int]:
|
|||
|
|
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, color2: float | tuple[int, ...]) -> float:
|
|||
|
|
"""
|
|||
|
|
Uses 1-norm distance to calculate difference between two values.
|
|||
|
|
"""
|
|||
|
|
if isinstance(color2, tuple):
|
|||
|
|
return sum(abs(color1[i] - color2[i]) for i in range(0, len(color2)))
|
|||
|
|
else:
|
|||
|
|
return abs(color1 - color2)
|