ICM HW3 Change to Chengchao's Code - Color change when circle hits wall

colorMode(HSL);
fill(h, s, l);
ellipse(a, b, 30, 30);
if (a >= width - 15 || a <= x + 30) {
  directiona = -directiona;
  h += random(20, 200);
}
if (b >= height - 15 || b <= 15) {
  directionb = -directionb;
  h -= random(20,70);
}
a += speeda * directiona;
b += speedb * directionb;
//reset color
if (h > 360){
  h = 0;
}