// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 18-3: Creating objects from a text file
  
  // A Class to describe a "Bubble"
  
  class Bubble {
    float x,y;
    float diameter;
    float speed;
    float r,g;
    
    // The constructor initializes color and size
    // Location is filled randomly
    Bubble(float r_, float g_, float diameter_) {
      x = random(width);
      y = height;
      r = r_;
      g = g_;
      diameter = diameter_;
    }
    
    // Display the Bubble
    void display() {
      stroke(0);
      fill(r,g,255,150);
      ellipse(x,y,diameter,diameter);
    }
    
    // Move the bubble
    void drift() {
      y += random(-3,-0.1);
      x += random(-1,1);
      if (y < -diameter*2) {
        y = height + diameter*2;
      }
    }
  
  }