// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 3-4: Drawing a continuous line
  void setup() {
    size(200, 200);
    background(255);
    smooth();
  }
  
  void draw() {
    stroke(0);
    // Draw a line from previous mouse location to current mouse location.
    line(pmouseX, pmouseY, mouseX, mouseY);
  }