jpayne@68: #!/usr/bin/env python3
jpayne@68: """       turtle-example-suite:
jpayne@68: 
jpayne@68:             tdemo_paint.py
jpayne@68: 
jpayne@68: A simple  event-driven paint program
jpayne@68: 
jpayne@68: - left mouse button moves turtle
jpayne@68: - middle mouse button changes color
jpayne@68: - right mouse button toggles between pen up
jpayne@68: (no line drawn when the turtle moves) and
jpayne@68: pen down (line is drawn). If pen up follows
jpayne@68: at least two pen-down moves, the polygon that
jpayne@68: includes the starting point is filled.
jpayne@68:  -------------------------------------------
jpayne@68:  Play around by clicking into the canvas
jpayne@68:  using all three mouse buttons.
jpayne@68:  -------------------------------------------
jpayne@68:           To exit press STOP button
jpayne@68:  -------------------------------------------
jpayne@68: """
jpayne@68: from turtle import *
jpayne@68: 
jpayne@68: def switchupdown(x=0, y=0):
jpayne@68:     if pen()["pendown"]:
jpayne@68:         end_fill()
jpayne@68:         up()
jpayne@68:     else:
jpayne@68:         down()
jpayne@68:         begin_fill()
jpayne@68: 
jpayne@68: def changecolor(x=0, y=0):
jpayne@68:     global colors
jpayne@68:     colors = colors[1:]+colors[:1]
jpayne@68:     color(colors[0])
jpayne@68: 
jpayne@68: def main():
jpayne@68:     global colors
jpayne@68:     shape("circle")
jpayne@68:     resizemode("user")
jpayne@68:     shapesize(.5)
jpayne@68:     width(3)
jpayne@68:     colors=["red", "green", "blue", "yellow"]
jpayne@68:     color(colors[0])
jpayne@68:     switchupdown()
jpayne@68:     onscreenclick(goto,1)
jpayne@68:     onscreenclick(changecolor,2)
jpayne@68:     onscreenclick(switchupdown,3)
jpayne@68:     return "EVENTLOOP"
jpayne@68: 
jpayne@68: if __name__ == "__main__":
jpayne@68:     msg = main()
jpayne@68:     print(msg)
jpayne@68:     mainloop()