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gistfile1.pde

int[][] result;
float t;

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

void draw() {

  if (!recording) {
    t = mouseX*1.0/width;
    draw_();
  } else {
    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++) {
      t = 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 | 
        int(result[i][0]*1.0/samplesPerFrame) << 16 | 
        int(result[i][1]*1.0/samplesPerFrame) << 8 | 
        int(result[i][2]*1.0/samplesPerFrame);
    updatePixels();

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

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

int samplesPerFrame = 16;
int numFrames = 108;        
float shutterAngle = .6;

boolean recording = true;
  
void setup_() {
  size(500, 500);
  //  smooth(8);
  rectMode(CENTER);
  noStroke();
}

float ease(float q) {
  return 3*q*q - 2*q*q*q;
}

float l = 30, lf;
int N = 10;
float x, y;
float th, tt;
color c1 = color(40), c2 = color(248);

void draw_() {
  pushMatrix();
  translate(width/2, height/2);
  scale(pow(2, .5*t));
  rotate(QUARTER_PI*t);
  background(c1); 
  for (int i=-N; i<=N; i++) {
    for (int j=-N; j<=N; j++) {
      x = i*l;
      y = j*l;
      tt = constrain(3*(t-.0025*dist(x, y, 0, 0)), 0, 1);
      th = QUARTER_PI*ease(tt);
      lf = 1/(sin(th)+cos(th));
      pushMatrix();
      translate(x, y);
      fill(c1);
      rect(0, 0, l, l);
      fill(c2);
      if ((i+j)%2 != 0){
        scale(tt);
        rotate(th);
      }
      else
        rotate(-th);
      rect(0, 0, l*lf, l*lf);
      popMatrix();
    }
  }

  popMatrix();
}