int i;
int j;
int d;

void setup(){
  size(300,200);
  background(255,255,255);

  d=1;
  j=1;
}

void loop(){

  if (mousePressed == true) {
    //strokeWeight(j/15);
    stroke(j,255-j,255+d);

    rect(pmouseX,pmouseY,j*10,i);

    i += d;
    j += d;

  }

}

void keyPressed() {

  if(key == 's'){
    save("t.tif");
  }
}