Specifies how to draw the gradient outside a gradient brush's gradient vector or space.
The following illustration shows the available spread methods and their effect on LinearGradientBrush and RadialGradientBrush. The red line indicates the gradient space. A LinearGradientBrush defines its gradient space with its StartPoint (LinearGradientBrush) and EndPoint (LinearGradientBrush) properties. A RadialGradientBrush defines its gradient space with its Center (RadialGradientBrush), RadiusX (RadialGradientBrush), and RadiusY (RadialGradientBrush) properties.