#
|
# 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 Image, ImageColor
|
|
try:
|
import warnings
|
except ImportError:
|
warnings = None
|
|
##
|
# A simple 2D drawing interface for PIL images.
|
# <p>
|
# Application code should use the <b>Draw</b> factory, instead of
|
# directly.
|
|
class ImageDraw:
|
|
##
|
# 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.
|
|
def __init__(self, im, mode=None):
|
im.load()
|
if im.readonly:
|
im._copy() # make it writable
|
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.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, mode)
|
else:
|
self.ink = self.draw.draw_ink(-1, mode)
|
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 = 0
|
self.font = None
|
|
##
|
# Set the default pen color.
|
|
def setink(self, ink):
|
# compatibility
|
if warnings:
|
warnings.warn(
|
"'setink' is deprecated; use keyword arguments instead",
|
DeprecationWarning, stacklevel=2
|
)
|
if Image.isStringType(ink):
|
ink = ImageColor.getcolor(ink, self.mode)
|
if self.palette and not Image.isNumberType(ink):
|
ink = self.palette.getcolor(ink)
|
self.ink = self.draw.draw_ink(ink, self.mode)
|
|
##
|
# Set the default background color.
|
|
def setfill(self, onoff):
|
# compatibility
|
if warnings:
|
warnings.warn(
|
"'setfill' is deprecated; use keyword arguments instead",
|
DeprecationWarning, stacklevel=2
|
)
|
self.fill = onoff
|
|
##
|
# Set the default font.
|
|
def setfont(self, font):
|
# compatibility
|
self.font = font
|
|
##
|
# Get the current default font.
|
|
def getfont(self):
|
if not self.font:
|
# FIXME: should add a font repository
|
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 Image.isStringType(ink):
|
ink = ImageColor.getcolor(ink, self.mode)
|
if self.palette and not Image.isNumberType(ink):
|
ink = self.palette.getcolor(ink)
|
ink = self.draw.draw_ink(ink, self.mode)
|
if fill is not None:
|
if Image.isStringType(fill):
|
fill = ImageColor.getcolor(fill, self.mode)
|
if self.palette and not Image.isNumberType(fill):
|
fill = self.palette.getcolor(fill)
|
fill = self.draw.draw_ink(fill, self.mode)
|
return ink, fill
|
|
##
|
# Draw an arc.
|
|
def arc(self, xy, start, end, fill=None):
|
ink, fill = self._getink(fill)
|
if ink is not None:
|
self.draw.draw_arc(xy, start, end, ink)
|
|
##
|
# Draw a bitmap.
|
|
def bitmap(self, xy, bitmap, fill=None):
|
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)
|
|
##
|
# Draw a chord.
|
|
def chord(self, xy, start, end, fill=None, outline=None):
|
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:
|
self.draw.draw_chord(xy, start, end, ink, 0)
|
|
##
|
# Draw an ellipse.
|
|
def ellipse(self, xy, fill=None, outline=None):
|
ink, fill = self._getink(outline, fill)
|
if fill is not None:
|
self.draw.draw_ellipse(xy, fill, 1)
|
if ink is not None:
|
self.draw.draw_ellipse(xy, ink, 0)
|
|
##
|
# Draw a line, or a connected sequence of line segments.
|
|
def line(self, xy, fill=None, width=0):
|
ink, fill = self._getink(fill)
|
if ink is not None:
|
self.draw.draw_lines(xy, ink, width)
|
|
##
|
# (Experimental) Draw a shape.
|
|
def shape(self, shape, fill=None, outline=None):
|
# experimental
|
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:
|
self.draw.draw_outline(shape, ink, 0)
|
|
##
|
# Draw a pieslice.
|
|
def pieslice(self, xy, start, end, fill=None, outline=None):
|
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:
|
self.draw.draw_pieslice(xy, start, end, ink, 0)
|
|
##
|
# Draw one or more individual pixels.
|
|
def point(self, xy, fill=None):
|
ink, fill = self._getink(fill)
|
if ink is not None:
|
self.draw.draw_points(xy, ink)
|
|
##
|
# Draw a polygon.
|
|
def polygon(self, xy, fill=None, outline=None):
|
ink, fill = self._getink(outline, fill)
|
if fill is not None:
|
self.draw.draw_polygon(xy, fill, 1)
|
if ink is not None:
|
self.draw.draw_polygon(xy, ink, 0)
|
|
##
|
# Draw a rectangle.
|
|
def rectangle(self, xy, fill=None, outline=None):
|
ink, fill = self._getink(outline, fill)
|
if fill is not None:
|
self.draw.draw_rectangle(xy, fill, 1)
|
if ink is not None:
|
self.draw.draw_rectangle(xy, ink, 0)
|
|
##
|
# Draw text.
|
|
def text(self, xy, text, fill=None, font=None, anchor=None):
|
ink, fill = self._getink(fill)
|
if font is None:
|
font = self.getfont()
|
if ink is None:
|
ink = fill
|
if ink is not None:
|
try:
|
mask, offset = font.getmask2(text, self.fontmode)
|
xy = xy[0] + offset[0], xy[1] + offset[1]
|
except AttributeError:
|
try:
|
mask = font.getmask(text, self.fontmode)
|
except TypeError:
|
mask = font.getmask(text)
|
self.draw.draw_bitmap(xy, mask, ink)
|
|
##
|
# Get the size of a given string, in pixels.
|
|
def textsize(self, text, font=None):
|
if font is None:
|
font = self.getfont()
|
return font.getsize(text)
|
|
##
|
# 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.
|
|
def Draw(im, mode=None):
|
try:
|
return im.getdraw(mode)
|
except AttributeError:
|
return ImageDraw(im, mode)
|
|
# experimental access to the outline API
|
try:
|
Outline = Image.core.outline
|
except:
|
Outline = 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.
|
# @return A (drawing context, drawing resource factory) tuple.
|
|
def getdraw(im=None, hints=None):
|
# FIXME: this needs more work!
|
# FIXME: come up with a better 'hints' scheme.
|
handler = None
|
if not hints or "nicest" in hints:
|
try:
|
import _imagingagg
|
handler = _imagingagg
|
except ImportError:
|
pass
|
if handler is None:
|
import ImageDraw2
|
handler = ImageDraw2
|
if im:
|
im = handler.Draw(im)
|
return im, handler
|
|
##
|
# (experimental) Fills a bounded region with a given color.
|
#
|
# @param image Target image.
|
# @param xy Seed position (a 2-item coordinate tuple).
|
# @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.
|
|
def floodfill(image, xy, value, border=None):
|
"Fill bounded region."
|
# based on an implementation by Eric S. Raymond
|
pixel = image.load()
|
x, y = xy
|
try:
|
background = pixel[x, y]
|
if background == value:
|
return # seed point already has fill color
|
pixel[x, y] = value
|
except IndexError:
|
return # seed point outside image
|
edge = [(x, y)]
|
if border is None:
|
while edge:
|
newedge = []
|
for (x, y) in edge:
|
for (s, t) in ((x+1, y), (x-1, y), (x, y+1), (x, y-1)):
|
try:
|
p = pixel[s, t]
|
except IndexError:
|
pass
|
else:
|
if p == background:
|
pixel[s, t] = value
|
newedge.append((s, t))
|
edge = newedge
|
else:
|
while edge:
|
newedge = []
|
for (x, y) in edge:
|
for (s, t) in ((x+1, y), (x-1, y), (x, y+1), (x, y-1)):
|
try:
|
p = pixel[s, t]
|
except IndexError:
|
pass
|
else:
|
if p != value and p != border:
|
pixel[s, t] = value
|
newedge.append((s, t))
|
edge = newedge
|
