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1"""Draw on top of an image"""
2
3from Tkinter import *
4import sys
5
6def main():
7    filename = sys.argv[1]
8    root = Tk()
9    img = PhotoImage(file=filename)
10    w, h = img.width(), img.height()
11    canv = Canvas(root, width=w, height=h)
12    canv.create_image(0, 0, anchor=NW, image=img)
13    canv.pack()
14    canv.bind('<Button-1>', blob)
15    root.mainloop()
16
17def blob(event):
18    x, y = event.x, event.y
19    canv = event.widget
20    r = 5
21    canv.create_oval(x-r, y-r, x+r, y+r, fill='red', outline="")
22
23main()
24