void setup(){
  size (600,600);
  background(240);
  //frameRate(120);
}

void draw(){
  //background(220,220,220,1);

  noStroke();
  if (mouseY<200) {
    fill(random(255));
    plus(mouseX+random(-50,50),mouseY+random(-50,50),random(4));
  }
  else if (mouseY>200 && mouseY<400) {
    fill(random(255),0,0);
    plus(mouseX+random(-50,50),mouseY+random(-50,50),random(10));
  }
  else if (mouseY>400 && mouseY<height) {
    fill(random(255));
    plus(mouseX+random(-50,50),mouseY+random(-50,50),random(4));
  }
}    

void plus (float bx, float by, float c) { // bx=x position of the rect; by=y position of the rect; c=thickness of the rect;
  rect (bx+c,by,c,c*3);
  rect (bx,by+c,c*3,c);
}

void mousePressed() {
  if( mouseButton == LEFT){
    background(240);
  }
}

void keyPressed(){
 // save frame
  if(keyPressed) {
    if (key == 's' || key == 'S') {
      saveFrame("image-####.png");
    }
  }
}