millis() Processing timer example

int x, xVelocity, y, yVelocity;

void setup(){
  size(640,480);
  x = width/2;
  y = height/2;
  xVelocity = 0;
  yVelocity = 0;
}

void draw(){
  background(0);
  ellipse(x, y, 20, 20);
  if( millis() <= 2000 ) xVelocity = 2;
  else if( millis() <= 4000 ){
    xVelocity = 0;
    yVelocity = 2;
  }
  else if( millis() <= 6000 ){
    xVelocity = -2;
    yVelocity = 0;
  }
  else if( millis() <= 8000 ){
    xVelocity = 0;
    yVelocity = -2;
  }
  else noLoop();
  x += xVelocity;
  y += yVelocity;
}