/Demo/turtle/tdemo_paint.py

 1#!/usr/bin/python
 2"""       turtle-example-suite:
 3
 4            tdemo_paint.py
 5
 6A simple  eventdriven paint program
 7
 8- use left mouse button to move turtle
 9- middle mouse button to change color
10- right mouse button do turn filling on/off
11 -------------------------------------------
12 Play around by clicking into the canvas
13 using all three mouse buttons.
14 -------------------------------------------
15          To exit press STOP button
16 -------------------------------------------
17"""
18from turtle import *
19
20def switchupdown(x=0, y=0):
21    if pen()["pendown"]:
22        end_fill()
23        up()
24    else:
25        down()
26        begin_fill()
27
28def changecolor(x=0, y=0):
29    global colors
30    colors = colors[1:]+colors[:1]
31    color(colors[0])
32
33def main():
34    global colors
35    shape("circle")
36    resizemode("user")
37    shapesize(.5)
38    width(3)
39    colors=["red", "green", "blue", "yellow"]
40    color(colors[0])
41    switchupdown()
42    onscreenclick(goto,1)
43    onscreenclick(changecolor,2)
44    onscreenclick(switchupdown,3)
45    return "EVENTLOOP"
46
47if __name__ == "__main__":
48    msg = main()
49    print msg
50    mainloop()