// Noise Wave 
// Daniel Shiffman <http://www.shiffman.net> 

int xspacing = 8;   // How far apart should each horizontal location be spaced 
int w;              // Width of entire wave 
 
float yoff = 0.0f;        // 2nd dimension of perlin noise 
float[] yvalues;          // Using an array to store height values for the wave (not entirely necessary) 
 
void setup() { 
  size(200,200); 
  framerate(30); 
  colorMode(RGB,255,255,255,100); 
  smooth(); 
  w = width+16; 
  yvalues = new float[w/xspacing]; 
} 
 
void draw() { 
  background(0); 
  calcWave(); 
  renderWave(); 
 
} 
 
void calcWave() { 
  float dx = 0.05f; 
  float dy = 0.01f; 
  float amplitude = 100.0f; 
 
  // Increment y ('time') 
  yoff += dy; 
 
  //float xoff = 0.0;  // Option #1 
  float xoff = yoff; // Option #2 
 
  for (int i = 0; i < yvalues.length; i++) { 
    // Using 2D noise function 
    //yvalues[i] = (2*noise(xoff,yoff)-1)*amplitude; // Option #1 
    // Using 1D noise function 
    yvalues[i] = (2*noise(xoff)-1)*amplitude;    // Option #2 
    xoff+=dx; 
  } 
 
} 
 
void renderWave() { 
  // A simple way to draw the wave with an ellipse at each location 
  for (int x = 0; x < yvalues.length; x++) { 
    noStroke(); 
    fill(255,50); 
    ellipseMode(CENTER); 
    ellipse(x*xspacing,width/2+yvalues[x],16,16); 
  } 
}