gistfile1.txt

// when 'recording' is false mouseX controls time
// when it's set to true, frames are saved in sketch folder

void setup() {
  size(500, 500);
  colorMode(HSB, 1);
  noStroke();
}

float time, xpos;
int numFrames = 100, numDots = 16;
float diam = 15;
boolean recording = false;

void draw() {
  if (recording)
    time = frameCount*1.0/numFrames;
  else
    time = mouseX*1.0/width;

  pushMatrix();
  translate(width/2, height/2);
  background(0);
  for (int i=0; i<numDots; i++) {
    fill(i*1.0/numDots, 1, 1);
    xpos = 120 + 80*cos(TWO_PI*time + 3*TWO_PI*i/numDots);
    pushMatrix();
    rotate(TWO_PI*i/numDots);
    ellipse(xpos, 0, diam, diam);
    popMatrix();
  }
  popMatrix();

  if (recording) {
    saveFrame("f###.gif");
    if (frameCount == numFrames)
      exit();
  }
}