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"""Draw on top of an image"""
from Tkinter import *
import sys
def main():
filename = sys.argv[1]
root = Tk()
img = PhotoImage(file=filename)
w, h = img.width(), img.height()
canv = Canvas(root, width=w, height=h)
canv.create_image(0, 0, anchor=NW, image=img)
canv.pack()
canv.bind('<Button-1>', blob)
root.mainloop()
def blob(event):
x, y = event.x, event.y
canv = event.widget
r = 5
canv.create_oval(x-r, y-r, x+r, y+r, fill='red', outline="")
main()
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