Processing w1_01_a

void setup() {
  size(500, 500);
 background(255);
 rectMode(RADIUS);
 colorMode(HSB,width,100,100);
}

void draw() {
  if (mousePressed) {
    int xdiff = abs(pmouseX-mouseX);
    int ydiff = abs(pmouseY-mouseY);
    if ( xdiff < 6 ) { xdiff = 6; }
    if ( ydiff < 6 ) { ydiff = 6; }
    stroke(height-mouseY); // set the stroke colour
    fill(mouseX, (height*100)/(abs(mouseY)+1), ((height-mouseY)*100)/(abs(mouseY)+1), random(255));
    line(pmouseX, pmouseY, mouseX, mouseY);
    rect(mouseX, mouseY, random(xdiff), random(ydiff));
  }

  // save your drawing when you press keyboard 's'
  if (keyPressed == true && key=='s') {
    saveFrame("Giles"+String.valueOf(year())+"-"+String.valueOf(month())+"-"+String.valueOf(day())+"-"+String.valueOf(hour())+"-"+String.valueOf(minute())+"-"+String.valueOf(second())+".jpg");
  }

  // erase your drawing when you press keyboard 'r'
  if (keyPressed == true && key == 'r') {
    background(width);
  }
}