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Set Gradient Origin for RadialGradientBrush

using System; using System.Windows; using System.Windows.Input; using System.Windows.Media;     class MainClass : Window     {         RadialGradientBrush brush;         [STAThread]         public static void Main()         {             Application app = new Application();             app.Run(new MainClass());         }         public MainClass()         {             Title = "title";             brush = new RadialGradientBrush(Colors.White, Colors.Red);             brush.RadiusX = brush.RadiusY = 0.10;             brush.SpreadMethod = GradientSpreadMethod.Repeat;             Background = brush;         }         protected override void OnMouseDown(MouseButtonEventArgs args)         {             double width = 300;             double height = 300;             Point ptMouse = args.GetPosition(this);             ptMouse.X /= width;             ptMouse.Y /= height;             brush.Center = ptMouse;             brush.GradientOrigin = ptMouse;         }     }