Minimal clock

float angleHour,angleMinute,angleSecond;

void setup() {

  size(400,400);

  noStroke();

}

​

void draw() {

  angleHour = TWO_PI*hour()/12-HALF_PI;

  angleMinute = TWO_PI*minute()/60-HALF_PI;

  angleSecond = TWO_PI*second()/60-HALF_PI;

  background(0);

  fill(255);

  ellipse(width/2,height/2,360,360);

  translate(width/2,height/2);

fill(180);  

  pushMatrix();

  rotate(angleHour);

  rect(100,-6,80,12);

  popMatrix();

  pushMatrix();

  rotate(angleMinute);

  rect(60,-3,120,6);

  popMatrix();

  pushMatrix();

  fill(255,200,0);

  rotate(angleSecond);

  translate(165,0);

  ellipse(0,0,10,10);

  popMatrix();

}