Re: Event-driven / callback programming of mouse or keyboard

I too thought of a way to introduce a callback, by using threads (this
is based on the scheme used in the graphing module, vis/graph.py, to
enable the feature that dragging the mouse shows crosshairs on a
graph).

from visual import *
import time
from threading import Thread, RLock

lock = RLock()

run = True

class timer(Thread): # This timer thread watches for mouse events.
    def run(self):
        global run
        while True:
            time.sleep(0.05)
            lock.acquire()
            if scene.mouse.clicked:
                scene.mouse.getclick()
                run = not run
            lock.release()

b = box()

thr = timer()
thr.start()

while True:
    rate(100)
    if run: b.rotate(angle=.01, axis=(0,1,0))

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