Waiting until a condition is true

ailurophile · May 2016

I’m trying to make a function that will pause the program until a condition is true. Here’s what I thought would work:

def wait_until( x ):
    while not x():
        pass

I’ve tried it with something like wait_until( lambda: keyPressed ) or wait_until( lambda: mouseX > 250 ) but neither of those works — the functions I input never seem to return True. Can you help me figure out why?

I don’t think it’s a problem with wait_until — I’ve found that it doesn’t work even if I just say something like this:

def setup():
    size( 200, 200 )
    while not keyPressed:
        pass
    background( 255 )

GoToLoop · May 2016

# forum.processing.org/two/discussion/16450/
# waiting-until-a-condition-is-true

# GoToLoop 2016-May-05

paused = False

def setup():
    size(800, 600)
    frameRate(1)


def draw():
    background(int(random(0x1000000)))
    frame.setTitle('Frame: ' + `frameCount`)


def keyPressed():
    global paused
    k = chr(keyCode) if key != CODED else keyCode

    if k == 'P':
        paused ^= True
        noLoop() if paused else loop()

    paused and frame.setTitle('Sketch is paused...')

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