the HYPE Framework / Joshua Davis

import hype.*;
import hype.extended.behavior.HRotate;
import hype.extended.behavior.HFollow;

HRect boundingBox, r;

void setup() {
 size(640,640);
 H.init(this).background(#242424);

 H.add(r = new HRect(100).rounding(10))
  .noStroke()
  .fill(#0095a8)
  .anchorAt(H.CENTER)
  .locAt(H.CENTER)
 ;

 H.add(boundingBox = new HRect().rounding(10))
  .strokeWeight(2)
  .stroke(#FF3300)
  .noFill()
 ;

 new HRotate().target(r).speed(1);
 new HFollow().target(r);
}

void draw() {
 // r.bounds() will set the x & y fields of loc and size
 PVector loc = new PVector(), size = new PVector();
 r.bounds(loc,size);
 boundingBox.size(size.x,size.y).loc(loc.x,loc.y);

 H.drawStage();
}