// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 18-9: Using Processing's XML library
  
  import processing.xml.*;
  
  // An array of Bubble objects
  Bubble[] bubbles;
  
  void setup() {
    size(200,200);
    smooth();
    // Load an XML document
    XMLElement xml = new XMLElement(this, "bubbles.xml" );
    
    // Getting the total number of Bubble objects with getChildCount().  
    int totalBubbles = xml.getChildCount(); 
    
    // Make an array the same size
    bubbles = new Bubble[totalBubbles];
    
    // Get all the child elements
    XMLElement[] children = xml.getChildren();
    
    for (int i = 0; i < children.length; i ++ ) {
      
      // The diameter is child 0
      XMLElement diameterElement = children[i].getChild(0);
      
      // The diameter is the content of the first element while red and green are attributes of the second.
      int diameter = int(diameterElement.getContent());
      
      // Color is child 1
      XMLElement colorElement = children[i].getChild(1);
      int r = colorElement.getIntAttribute("red");
      int g = colorElement.getIntAttribute("green");
      
      // Make a new Bubble object with values from XML document
      bubbles[i] = new Bubble(r,g,diameter);
    }
    
  }
  
  void draw() {
    background(255);
    
    // Display and move all bubbles
    for (int i = 0; i < bubbles.length; i++ ) {
      bubbles[i].display();
      bubbles[i].drift();
    }
  }