code: @Override
      protected boolean prepare(final Context2D context, final Attributes attr, final double alpha)
      {
          final double w = attr.getWidth();
  
          final double h = attr.getHeight();
  
          if ((w > 0) && (h > 0))
          {
              context.beginPath();
  
              context.ellipse(0, 0, w / 2, h / 2, 0, 0, Math.PI * 2, true);
  
              context.closePath();
  
              return true;
          }
          return false;
      }
docs: Draws this ellipse.
  
  @param context the {@link Context2D} used to draw this ellipse.