When clicked, the white box should change to a randomized color. It works if I put the mouse events (rollover+click) in the subclass display method, but not when I put it in the superclass. I need it to be in the superclass because I will be extending several subclasses that will use this (boxes with images; box with patterns, etc,).


RandomColorPalette myRandomColorPalette;

void setup() {  // call the setup function to define initial enviroment properties

  size(900, 700);  // set the canvas size at 800 pixels by 800 pixels
  background(230); // set background color to light gray

  myRandomColorPalette=new RandomColorPalette (color(227, 208, 140), 100, 400, 0);
}  // end the setup function

void draw () {  // call the draw function

  background(230); // reset background color to light gray everytime the draw function is recalled

  myRandomColorPalette.display();
}  // end the draw function



abstract class Grid {

  boolean mouseClickEvent=false;
  boolean mouseClickOverBox=false;

  float sizeOfSquares;
  color gridClr;
  float boxPosX;
  float boxPosY;


  Grid(color tempgridClr, float tempsizeOfSquares, float tempBoxPosX, float tempBoxPosY) {

    gridClr=tempgridClr;
    sizeOfSquares=tempsizeOfSquares;
    boxPosX=tempBoxPosX;
    boxPosY=tempBoxPosY;
  }  // end of the constructor


  void display () {

    // initialization of quilt patterns (from Shiffman page 261)

    for (int i=0;i<width;i+=sizeOfSquares) {
      for (int j=0;j<height;j+=sizeOfSquares) {
        fill(gridClr);
        rect(i, j, sizeOfSquares, sizeOfSquares);
      }
    }
  }  // end of the display function


  boolean mouseClickEvent () {  

    if (mousePressed) {
      return true;
    }      
    else {     
      return false;
    }
  }

  boolean mouseClickOverBox () {

    if (mouseClickEvent && ((mouseX>boxPosX) && (mouseX<boxPosX+sizeOfSquares) && (mouseY>boxPosY) && (mouseY<boxPosY+sizeOfSquares))) {
      return true;
    }     
    else {      
      return false;
    }
  }
} 



class RandomColorPalette extends Grid {


  float redColorChangeVariable;
  float greenColorChangeVariable;
  float blueColorChangeVariable;

  RandomColorPalette(color tempgridClr, float tempsizeOfSquares, float tempBoxPosX, float tempBoxPosY) {

    super (tempgridClr, tempsizeOfSquares, tempBoxPosX, tempBoxPosY);

    gridClr=tempgridClr;
    sizeOfSquares=tempsizeOfSquares;
    boxPosX=tempBoxPosX;
    boxPosY=tempBoxPosY;

    redColorChangeVariable=255.0;
    greenColorChangeVariable=255.0;
    blueColorChangeVariable=255.0;
  } 


  void display () {

    fill (redColorChangeVariable, greenColorChangeVariable, blueColorChangeVariable);
    rect (boxPosX,  boxPosY, sizeOfSquares, sizeOfSquares);

    if (mouseClickOverBox) {
      redColorChangeVariable= random(1, 255);
      greenColorChangeVariable= random(1, 255);
      blueColorChangeVariable= random(1, 255);

      fill (redColorChangeVariable, greenColorChangeVariable, blueColorChangeVariable);
      rect (boxPosX,  boxPosY, sizeOfSquares, sizeOfSquares);
    }
  }
}