Demo/turtle/tdemo_paint.py

   1 #!/usr/bin/env python
   2 """       turtle-example-suite:
   3
   4             tdemo_paint.py
   5
   6 A 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 """
  18 from turtle import *
  19
  20 def switchupdown(x=0, y=0):
  21     if pen()["pendown"]:
  22         end_fill()
  23         up()
  24     else:
  25         down()
  26         begin_fill()
  27
  28 def changecolor(x=0, y=0):
  29     global colors
  30     colors = colors[1:]+colors[:1]
  31     color(colors[0])
  32
  33 def 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
  47 if __name__ == "__main__":
  48     msg = main()
  49     print msg
  50     mainloop()