jpayne@69: #!/usr/bin/env python3
jpayne@69: """       turtle-example-suite:
jpayne@69: 
jpayne@69:             tdemo_paint.py
jpayne@69: 
jpayne@69: A simple  event-driven paint program
jpayne@69: 
jpayne@69: - left mouse button moves turtle
jpayne@69: - middle mouse button changes color
jpayne@69: - right mouse button toggles between pen up
jpayne@69: (no line drawn when the turtle moves) and
jpayne@69: pen down (line is drawn). If pen up follows
jpayne@69: at least two pen-down moves, the polygon that
jpayne@69: includes the starting point is filled.
jpayne@69:  -------------------------------------------
jpayne@69:  Play around by clicking into the canvas
jpayne@69:  using all three mouse buttons.
jpayne@69:  -------------------------------------------
jpayne@69:           To exit press STOP button
jpayne@69:  -------------------------------------------
jpayne@69: """
jpayne@69: from turtle import *
jpayne@69: 
jpayne@69: def switchupdown(x=0, y=0):
jpayne@69:     if pen()["pendown"]:
jpayne@69:         end_fill()
jpayne@69:         up()
jpayne@69:     else:
jpayne@69:         down()
jpayne@69:         begin_fill()
jpayne@69: 
jpayne@69: def changecolor(x=0, y=0):
jpayne@69:     global colors
jpayne@69:     colors = colors[1:]+colors[:1]
jpayne@69:     color(colors[0])
jpayne@69: 
jpayne@69: def main():
jpayne@69:     global colors
jpayne@69:     shape("circle")
jpayne@69:     resizemode("user")
jpayne@69:     shapesize(.5)
jpayne@69:     width(3)
jpayne@69:     colors=["red", "green", "blue", "yellow"]
jpayne@69:     color(colors[0])
jpayne@69:     switchupdown()
jpayne@69:     onscreenclick(goto,1)
jpayne@69:     onscreenclick(changecolor,2)
jpayne@69:     onscreenclick(switchupdown,3)
jpayne@69:     return "EVENTLOOP"
jpayne@69: 
jpayne@69: if __name__ == "__main__":
jpayne@69:     msg = main()
jpayne@69:     print(msg)
jpayne@69:     mainloop()