[Edu-sig] onClick(goto)

[Gregor Lingl]

Hi all of you!

In a previous post I used
 >>> onClick(goto).
No reaction. Hmmm... (perhaps nobody clicked)

For those of you, who didn't have the opportunity to look
into the xturtle.py  package, here is a typical untypical
example for the use of xturtle, 25 lines of code,
say painter.py:

""" A tiny paint program.

    After startup use mouse-buttons:
    left   - to move pen
    right  - to switch penstate from up to down and
             vice versa. switching to up begins filling,
             to down ends (and performs) filling
    middle - to switch color (you may use different colors
             for drawing lines and filling)

    draw and have fun!
"""

from xturtle import *

def switchupdown(x, y):
    if pen()["pendown"]:
        end_fill()
        up()
    else:
        down()
        begin_fill()

def changecolor(x, y):
    colors.append(colors.pop(0))
    color(colors[0])

shape("circle")
resizemode("user")
turtlesize(0.5)
width(3)
colors=["red", "green", "blue", "yellow"]
color(colors[0])
up()
onClick(goto,1)
onClick(changecolor,2)
onClick(switchupdown,3)
mainloop()  ## comment out if used from within IDLE with -n switch

### end of program

I think, this example shows, that fairly simple use
of fairly advanced concepts can lead to a fairly
funny result.

Try it out.
Have a nice weekend.

Gregor