class Button {
  int x, y;
  int w, h;
  color basecolor, highlightcolor;
  color currentcolor;
  boolean over = false;
  boolean pressed = false;
  int data = 0;
  
  void pressed() {
    if(over && mousePressed) {
      pressed = true;
      action();
    } 
    else {
      pressed = false;
    }    
  }
  
  boolean overRect(int x, int y, int width, int height) {
    if (mouseX >= x && mouseX <= x+width && 
        mouseY >= y && mouseY <= y+height) {
      return true;
    } else {
      return false;
    }
  }
  
  void action(){}
}

class ImageButton extends Button {
  PImage base;
  PImage roll;
  PImage down;
  PImage currentimage;

  ImageButton (){}

  // Creates image button
  // e.g. btn = MakeButton("base.gif", "roll.gif", "down.gif", widht/2, height/2);
  ImageButton (String baseFile, String rollFile, String downFile, int x, int y, int onPressData ){
    PImage b = loadImage(baseFile);
    PImage r = loadImage(rollFile);
    PImage d = loadImage(downFile);
    data = onPressData;
    x = x - b.width/2;
    y = y - b.height/2;
    int w = b.width;
    int h = b.height;
    _ImageButton(x, y, w, h, b, r, d);
  }
  
  void _ImageButton(int ix, int iy, int iw, int ih, PImage ibase, PImage iroll, PImage idown) {
    x = ix;
    y = iy;
    w = iw;
    h = ih;
    base = ibase;
    roll = iroll;
    down = idown;
    currentimage = base;
  }
  
  void draw(){
    update();
    display();
  }
  
  void update() {
    over();
    pressed();
    if(pressed) {
      currentimage = down;
    } else if (over){
      currentimage = roll;
    } else {
      currentimage = base;
    }
  }
  
  void over() {
    if( overRect(x, y, w, h) ) {
      over = true;
    } else {
      over = false;
    }
  }
  
  void display() {
    image(currentimage, x, y);
  }
}