Expanding ellipses

expanding-ellipses.pde

int count;
int maxradius = 40;
float growth = 0.6;

// perlin noise incrementer
float xoff;

void setup() {
 size(400, 400);
 
 // initialize parameters
 count = 0;
 xoff = 0.0;
}

void draw() {
  background(0);
  
  // set drawing parameters
  noFill();
  stroke(255);
  
  // expand circle until a certain point, then stop
  if (count < maxradius) {
    ellipse(width/2, height/4, count*growth, count*growth);
  }
  
  // expand circle until a certain point, then repeat
  float rad = count % maxradius;
  ellipse(width/2, height/2, rad*growth, rad*growth);
  
  // expand circle radius randomly
  float randomrad = (count % maxradius) * noise(xoff);
  //ellipse(width/2, 300, randomrad, randomrad);
  ellipse(width/2, 300, randomrad, randomrad);
  xoff += 0.03;
  
  count++;
}