progress.pde

boolean recording = false;
float time = 0;
int frame = 1;

void setup(){
  size(600, 600, P2D);
}

void draw(){
  if (time<=TWO_PI || !recording){
    background(28);
    noFill();
    strokeWeight(5);
    rectMode(CENTER);
    float off = 0;
    for (int i = 100; i<=width-100; i+=width/20){
      for (int j = 100; j<=height-100; j+=height/20){
        stroke(map(i,100,width-100,200,255),200,map(i,100,width-100,255,200));
        pushMatrix();
        translate(i,j);
        rotate(off);
        rect(0, 0, 20, 20);
        popMatrix();
        off+=sin(time)/15;
      }
    }
    time+=0.01;
    if (recording && frame%2==0) save(frame+".gif");
    frame++;
  }
}