1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
#
# The Python Imaging Library
# $Id: painter.py 2134 2004-10-06 08:55:20Z fredrik $
#
# this demo script illustrates pasting into an already displayed
# photoimage. note that the current version of Tk updates the whole
# image everytime we paste, so to get decent performance, we split
# the image into a set of tiles.
#
from Tkinter import *
import Image, ImageTk
import sys
#
# painter widget
class PaintCanvas(Canvas):
def __init__(self, master, image):
Canvas.__init__(self, master, width=image.size[0], height=image.size[1])
# fill the canvas
self.tile = {}
self.tilesize = tilesize = 32
xsize, ysize = image.size
for x in range(0, xsize, tilesize):
for y in range(0, ysize, tilesize):
box = x, y, min(xsize, x+tilesize), min(ysize, y+tilesize)
tile = ImageTk.PhotoImage(image.crop(box))
self.create_image(x, y, image=tile, anchor=NW)
self.tile[(x,y)] = box, tile
self.image = image
self.bind("<B1-Motion>", self.paint)
def paint(self, event):
xy = event.x - 10, event.y - 10, event.x + 10, event.y + 10
im = self.image.crop(xy)
# process the image in some fashion
im = im.convert("L")
self.image.paste(im, xy)
self.repair(xy)
def repair(self, box):
# update canvas
dx = box[0] % self.tilesize
dy = box[1] % self.tilesize
for x in range(box[0]-dx, box[2]+1, self.tilesize):
for y in range(box[1]-dy, box[3]+1, self.tilesize):
try:
xy, tile = self.tile[(x, y)]
tile.paste(self.image.crop(xy))
except KeyError:
pass # outside the image
self.update_idletasks()
#
# main
root = Tk()
im = Image.open(sys.argv[1])
if im.mode != "RGB":
im = im.convert("RGB")
PaintCanvas(root, im).pack()
root.mainloop()
|
