int xspacing = 8;   // How far apart should each horizontal location be spaced
  int w;              // Width of entire wave
  
  float theta = 0.0;  // Start angle at 0
  float amplitude = 75.0;  // Height of wave
  float period = 500.0;  // How many pixels before the wave repeats
  float dx;  // Value for incrementing X, a function of period and xspacing
  float[] yvalues;  // Using an array to store height values for the wave
  
  void setup() {
    size(200,200);
    frameRate(30);
    colorMode(RGB,255,255,255,100);
    smooth();
    w = width+16;
    dx = (TWO_PI / period) * xspacing;
    yvalues = new float[w/xspacing];
  }
  
  void draw() {
    background(0);
    calcWave();
    renderWave();
  
  }
  
  void calcWave() {
    // Increment theta (try different values for 'angular velocity' here
    theta += 0.02;
  
    // For every x value, calculate a y value with sine function
    float x = theta;
    for (int i = 0; i < yvalues.length; i++) {
      yvalues[i] = sin(x)*amplitude;
      x+=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);
    }
  }