// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 18-4: Loading and saving data to text file
  
  // An array of Bubble objects
  Bubble[] bubbles;
  
  void setup() {
    size(200,200);
    smooth();
    
    // Load text file as an array of Strings
    String[] data = loadStrings("data.txt");
    
    // The size of the array of Bubble objects is determined by the total number of lines in the text file.
    bubbles = new Bubble[data.length]; 
    for (int i = 0; i < bubbles.length; i ++ ) {
      // Each line is split into an array of floating point numbers.
      float[] values = float(split(data[i], "," )); 
      // The values in the array are passed into the Bubble class constructor.
      bubbles[i] = new Bubble(values[0],values[1],values[2]); 
    }
  }
  void draw() {
    background(255);
    
    // Display and move all bubbles
    for (int i = 0; i < bubbles.length; i ++ ) {
      bubbles[i].display();
      bubbles[i].drift();
      
      // Change bubbles if mouse rolls over
      if (bubbles[i].rollover(mouseX,mouseY)) {
        bubbles[i].change();
      }
    }
  }
  
  // Save new Bubble data when mouse is pressed
  void mousePressed() {
    saveData();
  }
  
  void saveData() {
    
    // For each Bubble make one String to be saved
    String[] data = new String[bubbles.length];
    
    for (int i = 0; i < bubbles.length; i ++ ) {
      // Concatenate bubble variables
      data[i] = bubbles[i].r + " , " + bubbles[i].g + " , " + bubbles[i].diameter;
    }
    
    // Save to File
    // The same file is overwritten by adding the data folder path to saveStrings().
    saveStrings("data/data.txt", data); 
  
  }