Is this possible?

I'm fairly new to visual programming and began with Processing this week, and I'm already stuck on some code that was merely a learning experiment.

The idea is to have Lines drawn from the center point to the edges of the window and then for the colors to rotate around that center point. The program prints correct numbers, but the render doesn't change regardless of smooth or noSmooth (or if I let it sit for a long time, it sometimes changes once to a bit uglier).

So my question is, what am I doing wrong, and is there a way to test for the render running like the print() function does to make sure program is running? Is my hardware just terrible (though when I changed the j*speed to just a mouseX it renders just fine)?

Code:

void setup(){
  size (400,250);
}

void draw(){
  colorMode(HSB, 360,100,100);
  background(0,0,100);
  noSmooth();
  float x = 0;	  //end x of each line
  float y = 0;	  //end y of each line
  float s = 0;	  //color of each line
  float speed = 10;    //speed of color rotation
  for (float j = 0; j < 360; j++) {
    noStroke();
    fill(0,0,100);
    rect(0,0,width,height);
    for (float i = 0; i < 360; i++) {
	float iw1 = map(i, 0, 90, 0, width);
	float ih1 = map(i, 270, 360, height, 0);
	float iw2 = map(i, 180, 270, width, 0);
	float ih2 = map(i, 90, 180, 0, height);
	if (i<90) {
	  x = iw1;
	  y = 0;
	} 
	else if (i<180){
	  x = width;
	  y = ih2;
	} 
	else if (i<270){
	  x = iw2;
	  y = height;
	} 
	else {
	  x = 0;
	  y = ih1;
	}
	s = ((i+j*speed) % 360);
	stroke(s,70,80);
	line((width/2),(height/2),x,y);
    }
    println(s); //print these just to see if variable are changing.
    println(j); //If s is changing, final color rendered should.
  }
}

 

On Build 0148.