forked from daleathan/PythonInPractice-MarkSummerfield
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imageproxy2.py
executable file
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imageproxy2.py
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#!/usr/bin/env python3
# Copyright © 2012-13 Qtrac Ltd. All rights reserved.
# This program or module is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version. It is provided for
# educational purposes and 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
# General Public License for more details.
import os
import tempfile
try:
import cyImage as Image
except ImportError:
import Image
YELLOW, CYAN, BLUE, RED, BLACK = (Image.color_for_name(color)
for color in ("yellow", "cyan", "blue", "red", "black"))
def main():
filename = os.path.join(tempfile.gettempdir(), "image.xpm")
image = Image.Image(300, 60)
draw_and_save_image(image, filename)
filename = os.path.join(tempfile.gettempdir(), "proxy.xpm")
image = ImageProxy(Image.Image, 300, 60)
draw_and_save_image(image, filename)
def draw_and_save_image(image, filename):
image.rectangle(0, 0, 299, 59, fill=YELLOW)
image.ellipse(0, 0, 299, 59, fill=CYAN)
image.ellipse(60, 20, 120, 40, BLUE, RED)
image.ellipse(180, 20, 240, 40, BLUE, RED)
image.rectangle(180, 32, 240, 40, fill=CYAN)
assert image.size == (300, 60) # force the image to be created
assert image.width == 300 and image.height == 60
image.line(181, 32, 239, 32, BLUE)
image.line(140, 50, 160, 50, BLACK)
image.save(filename)
print("saved", filename)
class ImageProxy:
def __init__(self, ImageClass, width=None, height=None, filename=None):
assert (width is not None and height is not None) or \
filename is not None
self.Image = ImageClass
self.__image = None
self.commands = []
if filename is not None:
self.load(filename)
else:
self.commands = [(self.Image, width, height)]
@property
def image(self):
if self.__image is None:
command = self.commands.pop(0)
function, *args = command
self.__image = function(*args)
for command in self.commands:
function, *args = command
function(self.image, *args)
return self.__image
def load(self, filename):
self.__image = None
self.commands = [(self.Image, None, None, filename)]
def save(self, filename=None):
self.image.save(filename)
def set_pixel(self, x, y, color):
if self.image is None:
self.commands.append((self.Image.set_pixel, x, y, color))
else:
self.image.set_pixel(x, y, color)
def line(self, x0, y0, x1, y1, color):
if self.image is None:
self.commands.append((self.Image.line, x0, y0, x1, y1, color))
else:
self.image.line(x0, y0, x1, y1, color)
def rectangle(self, x0, y0, x1, y1, outline=None, fill=None):
if self.image is None:
self.commands.append((self.Image.rectangle, x0, y0, x1, y1,
outline, fill))
else:
self.image.rectangle(x0, y0, x1, y1, outline, fill)
def ellipse(self, x0, y0, x1, y1, outline=None, fill=None):
if self.image is None:
self.commands.append((self.Image.ellipse, x0, y0, x1, y1,
outline, fill))
else:
self.image.ellipse(x0, y0, x1, y1, outline, fill)
def pixel(self, x, y):
return self.image.pixel(x, y)
def subsample(self, stride):
return self.image.subsample(stride)
def scale(self, ratio):
return self.image.scale(ratio)
@property
def size(self):
return self.image.size
@property
def width(self):
return self.image.width
@property
def height(self):
return self.image.height
if __name__ == "__main__":
main()