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-   -   Simplest script not working (https://forum.worldviz.com/showthread.php?t=3972)

vasiliys 10-21-2011 06:46 PM

Simplest script not working
 
I'm a bit dumbfounded by a tiny script not working the way I would expect:

This simple script should:
1. Turn the screen white on a 'w' press.
2. Turn the screen black on a 'b' press.
3. Turn the screen white, wait half a seconds and turn it black on a 's' press.

For some reason it will not turn it white on the 's' , though it does call the appropriate functions. I have no more ideas on what the issue could be. I hope someone here knows.

I have commented out all code irrelevant to the problem and it persists.

Code:

#import sys
import viz
#import vizparallel

viz.go()

def whiteScreen():
        print('White')
        viz.clearcolor(256, 256, 256)

vizact.onkeydown('w', whiteScreen)

def blackScreen():
        print('Black')
        viz.clearcolor(0, 0, 0)

vizact.onkeydown('b', blackScreen)

def sendSignal():
        whiteScreen()
        sendParallel()
        blackScreen()

vizact.onkeydown('s', sendSignal)

def sendParallel(signalCode = 24, delay = 0.5, port = 0x0378):
#        print('Sending code ' + str(signalCode) + ' for ' + str(delay) + ' seconds on port ' + str(port) + ' at tick ' + str(viz.tick()))
#        vizparallel.write( signalCode, port )
        sleep(delay)
#        print('Clearing with a zero at tick ' + str(viz.tick()))
#        vizparallel.write( 0, port )

def sleep(delay):
        start = viz.tick()
        while viz.tick() - start < delay: pass
        return viz.tick() - start


Jeff 10-24-2011 06:20 PM

Try using a task function to control the program flow. In the following code the screen will turn white for 0.5 seconds after the 's' key is pressed:
Code:

import viz
import viztask

viz.go()

def whiteScreen():
        print('White')
        viz.clearcolor(256, 256, 256)

vizact.onkeydown('w', whiteScreen)

def blackScreen():
        print('Black')
        viz.clearcolor(0, 0, 0)

vizact.onkeydown('b', blackScreen)

def signalTask():
        while True:
                yield viztask.waitKeyDown('s')
                whiteScreen()
                yield viztask.waitTime(0.5)
                blackScreen()

viztask.schedule(signalTask())


vasiliys 10-25-2011 10:24 AM

Quote:

Originally Posted by Jeff (Post 13128)
Try using a task function to control the program flow....

Thanks Jeff, I figured it out yesterday and made a solution similar to yours (though your method looks neater than mine so I will use it instead).

So from what I understand, though the clearcolor function was executing Vizard was only noting what color to change to. The color would actually change only once control flow was returned to Vizard - which is why it would appear as if only the final color was used.

Thanks for your help!


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