//See Mickey!
//Author: Alex Rector
//October 27, 2009
//This program uncovers Mickey Mouse when you drag the cursor 
//over the picture. (If you want to see the whole picture press "s")


PImage mouse;
PImage grey;

void setup () {
  size(312,400);
  background (0);
  noStroke();
  colorMode (HSB,360,100,100);
  smooth();
  mouse = loadImage("mouse.jpg"); //load mickey mouse background
  grey = loadImage("grey.jpg");//load grey cover up
  image(grey,0,0);
  mouse.loadPixels();
}

void draw(){
}

void mousePressed() {
  //loads the pixels from the display
  mouse.loadPixels();
}
void mouseDragged(){
  int h, s, b, j, i, currentIndex = mouseX-1 + (mouseY-1)*mouse.width;
  color currentPixelColor;
  //mouse.loadPixels();
  //sums the nine pixels h,s,b centered at the mouse
  for (h=0, s=0,b=0,j = 0; j<3; j++) {
    for (i = 0; i<3; i++) {
      h += hue(mouse.pixels[currentIndex+i]);
      s += saturation(mouse.pixels[currentIndex+i]);
      b += brightness(mouse.pixels[currentIndex+i]);
    }
    currentIndex += mouse.width;

  }
  //sets fill to be the average of the 10 pixels
  fill(color(h/10, s/10, constrain(b/10+20,0,100), 50));
  //draws a circle wth the averaged fill at the location
  ellipse(mouseX, mouseY, 30,30);


}

//shows the picture
void keyPressed() {
  if (key=='s') {
    image(mouse,0,0); 
  }
}

// covers back up the picture
void keyReleased() {
  image(grey,0,0);
}