// by dave @ beesandbombs.tumblr.com
////////////////////////////////////

int[][] result;
float time;

void setup() {
  setup_();
  result = new int[width*height][3];
}

void draw() {
  for (int i=0; i<width*height; i++)
    for (int a=0; a<3; a++)
      result[i][a] = 0;

  for (int sa=0; sa<samplesPerFrame; sa++) {
    time = map(frameCount-1 + sa*shutterAngle/samplesPerFrame, 0, numFrames, 0, 1);
    draw_();
    loadPixels();
    for (int i=0; i<pixels.length; i++) {
      result[i][0] += pixels[i] >> 16 & 0xff;
      result[i][1] += pixels[i] >> 8 & 0xff;
      result[i][2] += pixels[i] & 0xff;
    }
  }

  loadPixels();
  for (int i=0; i<pixels.length; i++)
    pixels[i] = 0xff << 24 | (result[i][0]/samplesPerFrame) << 16 | 
      (result[i][1]/samplesPerFrame) << 8 | (result[i][2]/samplesPerFrame);
  updatePixels();
  
  filter(INVERT);

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

//////////////////////////////////////////////////////////////////////////////

int samplesPerFrame = 8;
int numFrames = 40;        
float shutterAngle = .67;

void setup_() {
  size(500, 500, P2D);
  smooth(8);
  blendMode(ADD);
  noStroke();
}


float x, y, t, d = 30, sp = 2.3*d;
int N = 12;

void draw_() {
  t = (2*time)%1;
  t = 3*t*t - 2*t*t*t;
  t = 3*t*t - 2*t*t*t;
  t = .5*t;
  if(time >= .5)
    t += .5;
  background(0);
  pushMatrix();
  translate(width/2, height/2);
  fill(0,20,255);
  for (int i=-N; i<=N; i++) {
    for (int j=-N; j<=N; j++) {
      x = -sp*(i+t); y = sp*.866*j;
      if(j%2 != 0){
        x += .5*sp;
        x *= -1;
      }
      ellipse(x,y,d,d);
    }
  } 
  fill(20,255,0);
  pushMatrix();
  rotate(TWO_PI/3);
  for (int i=-N; i<=N; i++) {
    for (int j=-N; j<=N; j++) {
      x = -sp*(i+t); y = sp*.866*j;
      if(j%2 != 0){
        x += .5*sp;
        x *= -1;
      }
      ellipse(x,y,d,d);
    }
  } 
  popMatrix();
  fill(255,10,35);
  pushMatrix();
  rotate(TWO_PI*2/3);
  for (int i=-N; i<=N; i++) {
    for (int j=-N; j<=N; j++) {
      x = -sp*(i+t); y = sp*.866*j;
      if(j%2 != 0){
        x += .5*sp;
        x *= -1;
      }
      ellipse(x,y,d,d);
    }
  } 
  popMatrix();
  popMatrix(); 
}