HRESULT ID2D1RenderTarget::CreateRadialGradientBrush([In] const D2D1_RADIAL_GRADIENT_BRUSH_PROPERTIES* radialGradientBrushProperties,[In, Optional] const D2D1_BRUSH_PROPERTIES* brushProperties,[In] ID2D1GradientStopCollection* gradientStopCollection,[Out, Fast] ID2D1RadialGradientBrush** radialGradientBrush)

'宣言
 
Public Function CreateRadialGradientBrush( _
   ByRef radialGradientBrushProperties As RadialGradientBrushProperties, _
   ByVal brushProperties As System.Nullable(Of BrushProperties), _
   ByVal gradientStopCollection As GradientStopCollection _
) As RadialGradientBrush

public RadialGradientBrush CreateRadialGradientBrush( 
   ref RadialGradientBrushProperties radialGradientBrushProperties,
   System.Nullable<BrushProperties> brushProperties,
   GradientStopCollection gradientStopCollection
)