# Sketch - A Python-based interactive drawing program
# Copyright (C) 1997, 1998, 1999, 2000 by Bernhard Herzog
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# A simple graphics object that represents a pixel image. It uses the
# Python Image Library for file I/O. The ExternalData baseclass
# maintains a cache of images to avoid having multiple copies of data in
# memory.
#
import os
from types import StringType
import PIL.Image, PIL.ImageChops
from Sketch import _,RegisterCommands
from Sketch.UI.command import AddCmd
from external import ExternalData,get_cached,ExternalGraphics
class ImageData(ExternalData):
attributes = {'mode':0, 'size':0, 'im':0, 'info':0}
def __init__(self, image, filename = '', cache = 1):
# convert image to mode 'L' or 'RGB' if necessary
if image.mode not in ('RGB', 'RGBA', 'L'):
if image.mode == '1':
mode = 'L'
else:
mode = 'RGB'
image = image.convert(mode)
else:
image.load()
self.image = image
ExternalData.__init__(self, filename, cache)
def __getattr__(self, attr):
if self.attributes.has_key(attr):
return getattr(self.image, attr)
raise AttributeError, attr
def AsEmbedded(self):
if self.filename:
return ImageData(self.image)
else:
return self
def IsEmbedded(self):
return not self.filename
def Size(self):
return self.size
def Image(self):
return self.image
def Convert(self, mode):
if mode != self.image.mode:
return ImageData(self.image.convert(mode))
else:
return self
def Invert(self):
return ImageData(PIL.ImageChops.invert(self.image))
def load_image(filename, cache = 1):
if type(filename) == StringType:
image = get_cached(filename)
if image:
return image
image = PIL.Image.open(filename)
if type(filename) != StringType:
filename = ''
return ImageData(image, filename = filename, cache = cache)
class Image(ExternalGraphics):
is_Image = 1
is_clip = 1
commands = ExternalGraphics.commands[:]
def __init__(self, image = None, imagefile = '', trafo = None,
duplicate = None):
if duplicate is None:
if not image:
if not imagefile:
raise ValueError, 'Image must be instantiated with'\
' either image or imagefile'
image = load_image(imagefile)
ExternalGraphics.__init__(self, image, trafo,
duplicate = duplicate)
def DrawShape(self, device, rect = None, clip = 0):
device.DrawImage(self.data, self.trafo, clip)
def Info(self):
width, height = self.data.Size()
x, y = self.trafo.offset()
if self.IsEmbedded():
return _("Embedded Image %(width)d x %(height)d "
"at (%(x)d, %(y)d)") % locals()
else:
filename = os.path.basename(self.data.Filename())
return _("Linked Image `%(filename)s' %(width)d x %(height)d "
"at (%(x)d, %(y)d)") % locals()
def SaveToFile(self, file):
file.Image(self.data, self.trafo)
def IsEmbedded(self):
return self.data.IsEmbedded()
def CanEmbed(self):
return not self.IsEmbedded()
def Embed(self):
return self.SetData(self.data.AsEmbedded())
AddCmd(commands, 'EmbedImage', _("Embed Image"), Embed,
sensitive_cb = 'CanEmbed')
def CallImageFunction(self, function, args = ()):
if type(args) != type(()):
args = (args,)
data = apply(getattr(self.data, function), args)
return self.SetData(data)
AddCmd(commands, 'GrayscaleImage', _("Grayscale Image"),
CallImageFunction, args = ('Convert', 'L'))
AddCmd(commands, 'InvertImage', _("Invert Image"), CallImageFunction,
args = 'Invert')
context_commands = ('EmbedImage', 'GrayscaleImage', 'InvertImage')
RegisterCommands(Image)
|