https://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.lineargradientbrush(vvs.110).aspx 横向渐变 LinearGradientBrush linGrBrush new LinearGradientBrush(new Point(0, 10),new Point(200, 10),Color.FromArgb(255, 255, 0, 0), // Opaque redColor.Fr…