quickie2

float theta, var, th, sw, max;

void setup() {
  size(500, 500);
  strokeCap(SQUARE);
}

void draw() {
  background(#202020);
  noStroke();
  fill(#777777);
  max = 90;
  sw = map(sin(theta), -1, 1, 30, max);
  arc(width/2, height/2, 200+max, 200+max, PI*1, PI*3);
  stroke(#FCD300);
  strokeWeight(sw);
  noFill();
  arc(width/2, height/2, 200+(max-sw), 200+(max-sw), PI*var, PI*(var+th));
  th = map(sin(theta), -1, 1, 0.1, 0.3);
  var = map(sin(theta), -1, 1, -0.1, 1);
  theta += 0.0523;

  if (frameCount%2==0 && frameCount<121) saveFrame("image-###.gif");
}