code: @Override
      protected boolean prepare(final Context2D context, final Attributes attr, final double alpha)
      {
          final Point2DArray points = attr.getControlPoints();
  
          if ((points != null) && (points.size() == 3))
          {
              context.beginPath();
  
              final Point2D p0 = points.get(0);
  
              final Point2D p1 = points.get(1);
  
              final Point2D p2 = points.get(2);
  
              context.moveTo(p0.getX(), p0.getY());
  
              context.quadraticCurveTo(p1.getX(), p1.getY(), p2.getX(), p2.getY());
  
              return true;
          }
          return false;
      }
docs: Draws this quadratic curve
  
  @param context