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78 lines
2.0 KiB
Python
78 lines
2.0 KiB
Python
#!/usr/bin/env python
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#
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# The Python Imaging Library
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# $Id$
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#
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# this demo script illustrates pasting into an already displayed
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# photoimage. note that the current version of Tk updates the whole
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# image everytime we paste, so to get decent performance, we split
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# the image into a set of tiles.
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#
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try:
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from tkinter import *
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except ImportError:
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from Tkinter import *
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from PIL import Image, ImageTk
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import sys
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#
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# painter widget
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class PaintCanvas(Canvas):
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def __init__(self, master, image):
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Canvas.__init__(self, master, width=image.size[0], height=image.size[1])
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# fill the canvas
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self.tile = {}
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self.tilesize = tilesize = 32
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xsize, ysize = image.size
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for x in range(0, xsize, tilesize):
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for y in range(0, ysize, tilesize):
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box = x, y, min(xsize, x+tilesize), min(ysize, y+tilesize)
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tile = ImageTk.PhotoImage(image.crop(box))
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self.create_image(x, y, image=tile, anchor=NW)
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self.tile[(x,y)] = box, tile
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self.image = image
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self.bind("<B1-Motion>", self.paint)
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def paint(self, event):
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xy = event.x - 10, event.y - 10, event.x + 10, event.y + 10
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im = self.image.crop(xy)
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# process the image in some fashion
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im = im.convert("L")
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self.image.paste(im, xy)
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self.repair(xy)
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def repair(self, box):
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# update canvas
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dx = box[0] % self.tilesize
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dy = box[1] % self.tilesize
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for x in range(box[0]-dx, box[2]+1, self.tilesize):
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for y in range(box[1]-dy, box[3]+1, self.tilesize):
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try:
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xy, tile = self.tile[(x, y)]
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tile.paste(self.image.crop(xy))
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except KeyError:
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pass # outside the image
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self.update_idletasks()
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#
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# main
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root = Tk()
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im = Image.open(sys.argv[1])
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if im.mode != "RGB":
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im = im.convert("RGB")
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PaintCanvas(root, im).pack()
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root.mainloop()
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