'宣言 Public Property GradientOrigin As System.Drawing.PointF
public System.Drawing.PointF GradientOrigin {get; set;}
(0,0) is the top-left corner, (1,1) is the bottom-right corner. The default is (0.5f, 0.5f).
It is recommended that the CenterOfStartCircle property is used instead.
'宣言 Public Property GradientOrigin As System.Drawing.PointF
public System.Drawing.PointF GradientOrigin {get; set;}