Animation Threads...

[Anthony Yulo]

I have a main thread running the animation loop that increment timers and draw all sprites...
I also have the sprite threads...

in the sprite thread...

  
void run() {
  while(true){
     //wake up when the timer has incremented..
     //  timer is in the mainthread
     //updateposition();
     //suspend
  }
}

and then in the main thread...
[CODE]
void run{
while(true)
{
//increment timer()
//notify sprite threads of timer increment so they can udpate position
//wait until all sprite threads have updated their positions
//draw the sprite locations
delay(timerdelay);
}
}
So thats what i want to do..HOw do i implement this?
Where do i put the synchronized keyword? what object do i put it against?
DO i use Object.notifyAll() and Object.wait()?

[Abdul Narayan D'souza TP]

Anthony,
You could try this. I have assumed that each sprite thread has
a reference to a sprite object. i mean one to one mapping of sprite objects
and sprite threads
class YourTimer{
incrementTimer(){
//increment code goes here
}
}
class Sprite{
//Keeps track of how many sprite intances are created /
//threads are running
static int spriteCount;
updatePosition(){
//
}

drawSprite(Graphics g){
//drawing code goes here
}
}
volatile boolean timerIncremented=false;
volatile int drawingComplete=0;
Main Thread
void run{
while(true)
{
synchronized(yourTimer){
//increment timer()
yourTimer.incrementTimer();
timerIncremented=true;
//notify sprite threads of timer increment so
//they can udpate position
yourTimer.notifyAll();
}
drawingComplete=Sprite.spriteCount;
while(drawingComplete!=0){
//wait until all sprite threads have updated their
//positions
sleep(delay);//surround with try catch
}
//draw the sprite locations
//call the drawSprite method of each sprite object
delay(timerdelay);
}
}
Sprite Thread
void run()
{
while(true){
synchronized(yourTimer){
if(!timerIncremented)
{
yourTimer.wait();//surround with try catch
}
}
//wake up when the timer has incremented..
// timer is in the mainthread
sprite.updateposition();
//decrement drawingComplete
drawingComplete--;
}
}
I am pretty sure this will work.
-