// This BeanShell script demonstrates how to use the 
// ImageProcessor.applyMacro() method to do animation.

  imp = IJ.openImage("http://imagej.nih.gov/ij/images/boats.gif");
  div = 500;
  n = 30;
  delta = div/n;
  stack = new ImageStack(imp.getWidth(), imp.getHeight());
  ip = imp.getProcessor();
  for (i=0; i<n; i++) {
     IJ.showProgress(i, n-1);
     IJ.showStatus("Creating frame "+i+"/"+n);
     code = "a+=PI+d/"+div+";v=getPixel(d*cos(a)+w/2,d*sin(a)+h/2);";
     ip2 = ip.duplicate();
     ip2.applyMacro(code);
     stack.addSlice(ip2);
     div -= delta;
  }
  new ImagePlus("Rotational Animation", stack).show();
  IJ.run("Animation Options...", "speed=5 loop");
  IJ.doCommand("Start Animation [\\]");