1 #!/usr/bin/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()