class BUTTONS {
  int x;
  int y;
  int xOrginal;
  int yOrginal;
  String string;
  color mouseOut;
  color mouseOver;
  int buttonHeight;
  int buttonLength;
  int returnValue;
  boolean buttonMoved = false;
  
  BUTTONS (int xTEMP, int yTEMP, String stringTEMP, color mouseOutTEMP, color mouseOverTEMP, int buttonHeightTEMP, int buttonLengthTEMP, int returnValueTEMP) {
    xOrginal = xTEMP;
    x = xOrginal;
    yOrginal = yTEMP;
    y = yOrginal;
    string = stringTEMP;
    mouseOut = mouseOutTEMP;
    mouseOver = mouseOverTEMP;
    buttonHeight = buttonHeightTEMP;
    buttonLength = buttonLengthTEMP;
    returnValue = returnValueTEMP;
  }
  
  void position(){
     if (((mouseX>=x)&&(mouseX<=x+buttonLength))&&((mouseY>=y)&&(mouseY<=y+buttonHeight))){
       if (buttonMoved == false){
         x+=3;
         y+=3;
         buttonMoved = true;
       }
     }
     else{
       x=xOrginal;
       y=yOrginal;
       buttonMoved = false;
     }
  }
  
  void returnPosition(){
    x=xOrginal;
    y=yOrginal;
    buttonMoved = false;
  }
  
  void function(){
   if (((clickedMouseX>=x)&&(clickedMouseX<=x+buttonLength)&&(clickedMouseY>=y)&&(clickedMouseY<=y+buttonHeight)&&(mouseX>=x)&&(mouseX<=x+buttonLength)&&(mouseY>=y)&&(mouseY<=y+buttonHeight))){
     backgroundPointer = returnValue;
   }
  }
  
  void display(){
    if (((mouseX>=x)&&(mouseX<=x+buttonLength))&&((mouseY>=y)&&(mouseY<=y+buttonHeight))){
      fill(mouseOver);
    }
    else {
      fill(mouseOut);
    }
    stroke(0);
    rect(x,y,buttonLength,buttonHeight);
  }
}

color [] colours;
BUTTONS [] buttons;
int backgroundPointer;
int clickedMouseX;
int clickedMouseY;

void setup(){
  size (800,200);
  
  colours = new color [4];
  colours [0] = color(122,0,0);
  colours [1] = color(0,122,0);
  colours [2] = color(0,0,122);
  colours [3] = color(122,122,0);
  float randomPointer;
  randomPointer = random(4);
  backgroundPointer = int(randomPointer);
  
  buttons = new BUTTONS [4];
  buttons [0] = new BUTTONS(0,0,"hello", color (200,0,0), color (255,0,0), 50, 100, 0);
  buttons [1] = new BUTTONS(110,0,"hello", color (0,200,0), color (0,255,0), 50, 100, 1);
  buttons [2] = new BUTTONS(220,0,"hello", color (0,0,200), color (0,0,255), 50, 100, 2);
  buttons [3] = new BUTTONS(330,0,"hello", color (200,200,0), color (255,255,0), 50, 100, 3);
}

void draw(){
  background(colours[backgroundPointer]);
  for (int i=0; i<4; i++){
    buttons [i].display();
  }
}

void mousePressed(){
  clickedMouseX = mouseX;
  clickedMouseY = mouseY;
  for (int i=0; i<4; i++){
    buttons[i].position();
  }
}

void mouseReleased(){
  for (int i=0; i<4; i++){
    buttons [i].function();
    buttons[i].returnPosition();
  }
}
  
void mouseClicked(){
  clickedMouseX = mouseX;
  clickedMouseY = mouseY;
  for (int i=0; i<4; i++){
    buttons [i].function();
    buttons [i].returnPosition();
  }
}