Processing/Java Loop Issuse

Ziycon

I have the below code, the loop goes on forever, i want its just to run 100 times but it goes onto infinity! Can't seem to see why!?

float x;
float y;

void setup()
{
  size(800,600);
  background(0,0,0);
}

void draw()
{
  translate(width/2, height/2);
  stars();
}

void stars()
{
   fill(255,255,255);
   stroke(100);
   x = random(-800, 800);
   y = random(-600, 600);
   for(int i=0;i<100;i++)
   {
     line(x,y,x,y);
   }
}

Mutant_Fruit

At a guess, i'd say calling: line(x,y,x,y); ends up calling "Draw" which in turn calls "Star" which in turn calls line(x,y,x,y); again. Thus an infinite loop.

Of course, there's nowhere near enough code to see the problem. Also, you're drawing the same line with the same XY coordinates 100 times in that loop.

DoesNotCompute

Yeah, shouldn't the lines:

x = random(-800, 800);
y = random(-600, 600);

be in the for loop?

Ziycon

Mutant_Fruit wrote:

Of course, there's nowhere near enough code to see the problem. Also, you're drawing the same line with the same XY coordinates 100 times in that loop.

Thats all the code there is in the prog. so far! Also they xy cords are ment to be the same.

Yeah, shouldn't the lines:

x = random(-800, 800);
y = random(-600, 600);

be in the for loop?

Does'nt make any diff!

henbane

If that's all the code there is, I don't think the for loop is the problem. What are you trying to achieve and is there a standard package of some kind that you're using with this code?

seamus

This is where you get to learn the wonderful art of debugging. Before each line in the stars() method, tell it to output what it is doing, so you can keep track.

E.g.

void stars()
{
   System.out.println("Doing fill....");
   fill(255,255,255);
   System.out.println("Doing stroke...");
   stroke(100);
   System.out.println("Setting X & Y Vars....");
   x = random(-800, 800);
   y = random(-600, 600);
   System.out.println("Entering loop....");
   for(int i=0;i<100;i++)
   {
       System.out.println("Iteration " + i + " ....");
     line(x,y,x,y);
   }
}

Mutant_Fruit

So if that's *all* the code, how the hell are you running it?

Ziycon

Mutant_Fruit wrote:

So if that's *all* the code, how the hell are you running it?

Application called 'Processing', http://www.processing.org its a java based development enviroment for animation.