protected override object CreateGradientBackend (GradientBackendHandler handler) { return handler.CreateLinear (xStart, yStart, xEnd, yEnd); }
protected abstract object CreateGradientBackend (GradientBackendHandler handler);
protected override object CreateGradientBackend (GradientBackendHandler handler) { return handler.CreateRadial (cx0, cy0, radius0, cx1, cy1, radius1); }