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Index › Programming Questions & Help › Syntax Questions › Event dispatching, listening and the draw function
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Event dispatching, listening and the draw function (Read 549 times)
basti
Event dispatching, listening and the draw function
Dec 2nd, 2007, 7:28pm  
Hi,
is there a way in processing to dispatch events inside an object and having other objects listening to it. I've found the broadcaster library, but unfortunately it is not documented. Does anyone know how this library works, or how to realise event communication in processing?

And another beginner question... sorry i'm new to processing. I don't really understand the frame/loop draw() concept. If I create an object in the setup, is there a way that it runs its own timed loop. Let's say I have an object that is changing some values every 50 milliseconds, but the framerate of the applet is 10 fps. Could I broadcast something like an update event in the draw() function and having my object listening to it, so that it redraws itself with the values it has at this time?

Maybe a weird concept, does it make sense at all?

many thanks
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mflux
Re: Event dispatching, listening and the draw func
Reply #1 - Dec 3rd, 2007, 8:04am  
You can do something like

[code]

class TimedClass extends Thread{
 float delay;
 TimedClass( float d ){
   delay = d;
   start();
 }

 void run(){
   while(true){
     commands();
     try{
       sleep(delay);
     } catch(Exception e){}
   }
 }

 void commands(){
   // your stuff here
 }
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fluxhavoc  
basti
Re: Event dispatching, listening and the draw func
Reply #2 - Dec 3rd, 2007, 7:32pm  
Thanks soo much!
It works. Just had to change "float delay" into "long delay" because sleep() seems to need a long as argument.

Where can i find a documentation of classes like "Thread" that can be extended within a sketch? Which classes or libraries of the Java language can actually be used within a sketch?

Maybe there is an easy way to realise some sort of event communication between objects, with a broadcaster class or so. So all objects get that broadcast object while construction and look/listen to it every frame/loop. But then every object has to be a thread?!... Would that be CPU hungry?

Thanks a lot for any input/ideas and especially help!
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