https://learn.microsoft.com/en-us/windows/win32/api/d2d1/nf-d2d1-id2d1rendertarget-createradialgradientbrush(constd2d1_radial_gradient_brush_properties__constd2d1_brush_properties__id2d1gradientstopcollection_id2d1radialgradientbrush)
ID2D1RenderTarget::CreateRadialGradientBrush(const D2D1_RADIAL_GRADIENT_BRUSH_PROPERTIES &,const...
Creates an ID2D1RadialGradientBrush that contains the specified gradient stops and has the specified transform and base opacity.
radial gradientconstbrushproperties