PeachDrawing.Core
PeachDrawing.Core.RadialGradientBrush
RadialGradientBrush.FocusRadius Property
The radius of the circle around Focus the gradient’s first stop fills, in the units of RadiusX (0, the default, is a point). Meaningful for a circular gradient; with a nonzero value the gradient is the two-circle (conical) gradient from this circle to the outer one.
public double FocusRadius { get; init; }