code: public void setRadius(float radius) {
  		if (getOriginalLocation() != null) {
  			Bbox oldBounds = (Bbox) getOriginalLocation();
  			Bbox newBounds = (Bbox) oldBounds.clone();
  			newBounds.setWidth(2 * radius);
  			newBounds.setHeight(2 * radius);
  			newBounds.setCenterPoint(oldBounds.getCenterPoint());
  			setOriginalLocation(newBounds);
  		} else {
  			setOriginalLocation(new Bbox(0, 0, 2 * radius, 2 * radius));
  		}
  	}
docs: Set circle radius in world coordinates.
  
  @param radius circle radius in world units