class Button {
    
    int buttonx, buttony;
    int Size;
    PImage baseimage,overimage,pressimage,currentimage;
    boolean over = false;
    boolean press = false;
    
    Button(int xpos, int ypos, int s, PImage b, PImage o, PImage p) {
      buttonx = xpos;
      buttony = ypos;
      Size = s;
      baseimage = b;
      overimage = o;
      pressimage = p;
      currentimage=baseimage;
    }
    
    //updates "over"
    void update() {
      if ((mouseX >= buttonx) && (mouseX<= buttonx+Size) &&
         (mouseY >= buttony) && (mouseY<= buttony+Size)) {
           over = true;
             } else {
           over = false;
         }
    }
    
    //updates "press" when mouse pressed
    boolean press() {
      if (over == true) {
        press = true;
        return true;
      } else {
       return false;
      }
    }
  //set "press" to false when mouse released
  void release() {
  press = false;
  }

 //draws the button
 void display() {
  if (press == true) {
    currentimage=pressimage;
  } else if (over == true) {
   currentimage=overimage;
  } else {
  currentimage=baseimage;
  }
 image(currentimage,buttonx,buttony);
 }
}