check.pde

boolean recording = false;
int frame = 1;
float time = -PI/2;
float c = 10;

void setup(){
  size(720, 720, P2D);
}

void draw(){
  if (time < TWO_PI-PI/2 || !recording){
    background(200);
    fill(28);
    noStroke();
    rectMode(CENTER);
    for (int i = (int)(-width/c); i <= width; i += (int)(width/c)){
      for (int j = (int)(-height/c); j <= height; j += (int)(height/c)){
        pushMatrix();
        if (sin(time) < 0){
          translate(map(sin(time), -1, 1, i, i+width/c),j);
          rotate(map(sin(time), -1, 1, 0, PI));
        } else {
          translate(i-width/c/2, map(sin(time), -1, 1, j, j+height/c)-height/c/2);
          rotate(map(sin(time), -1, 1, 0, PI));
        }
        float s = sqrt(sq(width/c)/2);
        rect(0, 0, s, s);
        popMatrix();
      }
    }
    time += 0.01;
    if (recording) save(frame+".gif");
    frame++;
  }
}