// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 13-7: Wave
  
  // Starting angle
  float theta = 0.0;
  
  void setup() {
    size(200,200);
    smooth();
  }
  
  void draw() {
    background(255);
    
    // Increment theta (try different values for " angular velocity " here)
    theta += 0.02;
    noStroke();
    fill(0);
    float x = theta;
    
     // A for loop is used to draw all the points along a sine wave (scaled to the pixel dimension of the window).
    for (int i = 0; i <= 20; i++) {
      // Calculate y value based off of sine function
      float y = sin(x)*height/2;
      // Draw an ellipse
      ellipse(i*10,y + height/2,16,16);
      // Move along x-axis
      x += 0.2;
    }
  }