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authorLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
committerLibravatarLibravatar Biswakalyan Bhuyan <biswa@surgot.in> 2022-11-13 23:46:45 +0530
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tree0a77ada226d6db80639f96b438bf83e4e756edb5 /env/lib/python3.10/site-packages/PIL/ImageDraw.py
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+#
+# 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.
+#
+
+import math
+import numbers
+import warnings
+
+from . import Image, ImageColor
+from ._deprecate import deprecate
+
+"""
+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, mode=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:
+ raise ValueError("mode mismatch")
+ 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 _getink(self, ink, fill=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, start, end, fill=None, width=1):
+ """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, bitmap, fill=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, start, end, fill=None, outline=None, width=1):
+ """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, fill=None, outline=None, width=1):
+ """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, fill=None, width=0, joint=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:
+ if not isinstance(xy[0], (list, tuple)):
+ xy = [tuple(xy[i : i + 2]) for i in range(0, len(xy), 2)]
+ for i in range(1, len(xy) - 1):
+ point = xy[i]
+ angles = [
+ math.degrees(math.atan2(end[0] - start[0], start[1] - end[1]))
+ % 360
+ for start, end in ((xy[i - 1], point), (point, xy[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):
+ """(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, start, end, fill=None, outline=None, width=1):
+ """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, fill=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, fill=None, outline=None, width=1):
+ """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)
+ else:
+ # 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
+ ):
+ """Draw a regular polygon."""
+ xy = _compute_regular_polygon_vertices(bounding_circle, n_sides, rotation)
+ self.polygon(xy, fill, outline)
+
+ def rectangle(self, xy, fill=None, outline=None, width=1):
+ """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, radius=0, fill=None, outline=None, width=1):
+ """Draw a rounded rectangle."""
+ if isinstance(xy[0], (list, tuple)):
+ (x0, y0), (x1, y1) = xy
+ else:
+ x0, y0, x1, y1 = xy
+
+ d = radius * 2
+
+ full_x = d >= x1 - x0
+ if full_x:
+ # The two left and two right corners are joined
+ d = x1 - x0
+ full_y = d >= y1 - y0
+ 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:
+ # If the corners have no curve, that is a rectangle
+ return self.rectangle(xy, fill, outline, width)
+
+ r = d // 2
+ ink, fill = self._getink(outline, fill)
+
+ def draw_corners(pieslice):
+ 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 = (
+ ((x1 - d, y0, x1, y0 + d), 270, 360),
+ ((x1 - d, y1 - d, x1, y1), 0, 90),
+ ((x0, y1 - d, x0 + d, y1), 90, 180),
+ ((x0, y0, x0 + d, y0 + d), 180, 270),
+ )
+ 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:
+ self.draw.draw_rectangle((x0, y0 + r + 1, x0 + r, y1 - r - 1), fill, 1)
+ self.draw.draw_rectangle((x1 - r, y0 + r + 1, x1, y1 - r - 1), fill, 1)
+ if ink is not None and ink != fill and width != 0:
+ draw_corners(False)
+
+ if not full_x:
+ self.draw.draw_rectangle(
+ (x0 + r + 1, y0, x1 - r - 1, y0 + width - 1), ink, 1
+ )
+ self.draw.draw_rectangle(
+ (x0 + r + 1, y1 - width + 1, x1 - r - 1, y1), ink, 1
+ )
+ if not full_y:
+ self.draw.draw_rectangle(
+ (x0, y0 + r + 1, x0 + width - 1, y1 - r - 1), ink, 1
+ )
+ self.draw.draw_rectangle(
+ (x1 - width + 1, y0 + r + 1, x1, y1 - r - 1), ink, 1
+ )
+
+ def _multiline_check(self, text):
+ """Draw text."""
+ split_character = "\n" if isinstance(text, str) else b"\n"
+
+ return split_character in text
+
+ def _multiline_split(self, text):
+ split_character = "\n" if isinstance(text, str) else b"\n"
+
+ return text.split(split_character)
+
+ def _multiline_spacing(self, font, spacing, stroke_width):
+ # this can be replaced with self.textbbox(...)[3] when textsize is removed
+ with warnings.catch_warnings():
+ warnings.filterwarnings("ignore", category=DeprecationWarning)
+ return (
+ self.textsize(
+ "A",
+ font=font,
+ stroke_width=stroke_width,
+ )[1]
+ + 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,
+ ):
+ 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,
+ )
+
+ if embedded_color and self.mode not in ("RGB", "RGBA"):
+ raise ValueError("Embedded color supported only in RGB and RGBA modes")
+
+ if font is None:
+ font = self.getfont()
+
+ 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):
+ mode = self.fontmode
+ if stroke_width == 0 and embedded_color:
+ mode = "RGBA"
+ coord = xy
+ try:
+ mask, offset = font.getmask2(
+ text,
+ mode,
+ direction=direction,
+ features=features,
+ language=language,
+ stroke_width=stroke_width,
+ anchor=anchor,
+ ink=ink,
+ *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,
+ *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)
+ color.fillband(3, (ink >> 24) & 0xFF)
+ x, y = (int(c) for c in coord)
+ 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,
+ ):
+ if direction == "ttb":
+ raise ValueError("ttb direction is unsupported for multiline text")
+
+ if anchor is None:
+ anchor = "la"
+ elif len(anchor) != 2:
+ raise ValueError("anchor must be a 2 character string")
+ elif anchor[1] in "tb":
+ raise ValueError("anchor not supported for multiline text")
+
+ 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:
+ raise ValueError('align must be "left", "center" or "right"')
+
+ 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 textsize(
+ self,
+ text,
+ font=None,
+ spacing=4,
+ direction=None,
+ features=None,
+ language=None,
+ stroke_width=0,
+ ):
+ """Get the size of a given string, in pixels."""
+ deprecate("textsize", 10, "textbbox or textlength")
+ if self._multiline_check(text):
+ with warnings.catch_warnings():
+ warnings.filterwarnings("ignore", category=DeprecationWarning)
+ return self.multiline_textsize(
+ text,
+ font,
+ spacing,
+ direction,
+ features,
+ language,
+ stroke_width,
+ )
+
+ if font is None:
+ font = self.getfont()
+ with warnings.catch_warnings():
+ warnings.filterwarnings("ignore", category=DeprecationWarning)
+ return font.getsize(
+ text,
+ direction,
+ features,
+ language,
+ stroke_width,
+ )
+
+ def multiline_textsize(
+ self,
+ text,
+ font=None,
+ spacing=4,
+ direction=None,
+ features=None,
+ language=None,
+ stroke_width=0,
+ ):
+ deprecate("multiline_textsize", 10, "multiline_textbbox")
+ max_width = 0
+ lines = self._multiline_split(text)
+ line_spacing = self._multiline_spacing(font, spacing, stroke_width)
+ with warnings.catch_warnings():
+ warnings.filterwarnings("ignore", category=DeprecationWarning)
+ for line in lines:
+ line_width, line_height = self.textsize(
+ line,
+ font,
+ spacing,
+ direction,
+ features,
+ language,
+ stroke_width,
+ )
+ max_width = max(max_width, line_width)
+ return max_width, len(lines) * line_spacing - spacing
+
+ def textlength(
+ self,
+ text,
+ font=None,
+ direction=None,
+ features=None,
+ language=None,
+ embedded_color=False,
+ ):
+ """Get the length of a given string, in pixels with 1/64 precision."""
+ if self._multiline_check(text):
+ raise ValueError("can't measure length of multiline text")
+ if embedded_color and self.mode not in ("RGB", "RGBA"):
+ raise ValueError("Embedded color supported only in RGB and RGBA modes")
+
+ if font is None:
+ font = self.getfont()
+ mode = "RGBA" if embedded_color else self.fontmode
+ try:
+ return font.getlength(text, mode, direction, features, language)
+ except AttributeError:
+ deprecate("textlength support for fonts without getlength", 10)
+ with warnings.catch_warnings():
+ warnings.filterwarnings("ignore", category=DeprecationWarning)
+ size = self.textsize(
+ text,
+ font,
+ direction=direction,
+ features=features,
+ language=language,
+ )
+ if direction == "ttb":
+ return size[1]
+ return size[0]
+
+ 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,
+ ):
+ """Get the bounding box of a given string, in pixels."""
+ if embedded_color and self.mode not in ("RGB", "RGBA"):
+ raise ValueError("Embedded color supported only in RGB and RGBA modes")
+
+ if self._multiline_check(text):
+ return self.multiline_textbbox(
+ xy,
+ text,
+ font,
+ anchor,
+ spacing,
+ align,
+ direction,
+ features,
+ language,
+ stroke_width,
+ embedded_color,
+ )
+
+ if font is None:
+ font = self.getfont()
+ 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,
+ ):
+ if direction == "ttb":
+ raise ValueError("ttb direction is unsupported for multiline text")
+
+ if anchor is None:
+ anchor = "la"
+ elif len(anchor) != 2:
+ raise ValueError("anchor must be a 2 character string")
+ elif anchor[1] in "tb":
+ raise ValueError("anchor not supported for multiline text")
+
+ 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 = 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:
+ raise ValueError('align must be "left", "center" or "right"')
+
+ 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=None):
+ """
+ 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, xy, value, border=None, thresh=0):
+ """
+ (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 != value and p != 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):
+ """
+ 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):
+ raise TypeError("n_sides should be an int")
+ if n_sides < 3:
+ raise ValueError("n_sides should be an int > 2")
+
+ # 1.2 Check `bounding_circle` has an appropriate value
+ if not isinstance(bounding_circle, (list, tuple)):
+ raise TypeError("bounding_circle should be a tuple")
+
+ if len(bounding_circle) == 3:
+ *centroid, polygon_radius = bounding_circle
+ elif len(bounding_circle) == 2:
+ centroid, polygon_radius = bounding_circle
+ else:
+ raise ValueError(
+ "bounding_circle should contain 2D coordinates "
+ "and a radius (e.g. (x, y, r) or ((x, y), r) )"
+ )
+
+ if not all(isinstance(i, (int, float)) for i in (*centroid, polygon_radius)):
+ raise ValueError("bounding_circle should only contain numeric data")
+
+ if not len(centroid) == 2:
+ raise ValueError(
+ "bounding_circle centre should contain 2D coordinates (e.g. (x, y))"
+ )
+
+ if polygon_radius <= 0:
+ raise ValueError("bounding_circle radius should be > 0")
+
+ # 1.3 Check `rotation` has an appropriate value
+ if not isinstance(rotation, (int, float)):
+ raise ValueError("rotation should be an int or float")
+
+ # 2. Define Helper Functions
+ def _apply_rotation(point, degrees, centroid):
+ 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(centroid, polygon_radius, angle):
+ start_point = [polygon_radius, 0]
+ return _apply_rotation(start_point, angle, centroid)
+
+ def _get_angles(n_sides, rotation):
+ 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(centroid, polygon_radius, angle) for angle in angles
+ ]
+
+
+def _color_diff(color1, color2):
+ """
+ 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)