Rolling

// TITLE: Rolling
// Adam Tindale 2010

int count = 0;
import gifAnimation.*;

GifMaker gifExport;
void setup(){

  gifExport = new GifMaker(this, "blackorwhite.gif");
  gifExport.setRepeat(0);

 frameRate(5);
 noStroke();
}

void draw(){
  background(0);

  rect(((count-10)/10.0) * width,0, width, height);

 gifExport.setDelay(5);
 gifExport.addFrame();

 if (count == 19){
  gifExport.finish();
  exit();
 }

  count = ++count % 20;
}