processing.js example 1

int X, Y;
int rectloc = 100;
int elliloc = 300;

void setup() {
   size(500, 500);
   background(#000000);
   //frameRate(10);
  //noStroke();
}

void draw() {

   background(#000000); // "redraws" the screen.
         text("Meow", 1, height-(height-11));
   // rect(X, Y, 55, 55);
   rect(rectloc, rectloc, 55, 55);
   if(X > rectloc && X < rectloc+55 && Y > rectloc && Y < rectloc+55) {
      int i = 10;
      while(i--) rect(random(500), random(500), 55, 55);
   }

   ellipse(elliloc, elliloc, 55, 55);
   if(X > elliloc && X < elliloc+55 && Y > elliloc && Y < elliloc+55) {
      int i = 10;
      while(i--) ellipse(random(500), random(500), 55, 55);
   }

}

void mouseMoved( ) {
   X = mouseX;
   Y = mouseY;
}