Chapter 13: Example 13-4: Perlin Noise

// Learning Processing
// Daniel Shiffman
// http://www.learningprocessing.com

// Example 13-4: Perlin noise

float time = 0.0;
float increment = 0.01;

void setup() {
  size(200,200);
  smooth(); 
}

void draw() {
  background(255);
  
   // Get a noise value at "time" and scale it according to the window's width.
  float n = noise(time)*width;
  
  // With each cycle, increment the " time "
  time += increment;
  
  // Draw the ellipse with size determined by Perlin noise
  fill(0);
  ellipse(width/2,height/2,n,n);
}