docs: public void fillRoundRect(double x, double y, double width, double height, double arcWidth, double arcHeight) {
  		this.gc.fillRoundRect(
  				doc2fxX(x), doc2fxY(y),
  				doc2fxSize(width), doc2fxSize(height),
  				doc2fxSize(arcWidth), doc2fxSize(arcHeight));
  	}