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