ComponentFactory.Krypton.Toolkit.KryptonOffice2007Renderer.DrawGradientBack C# (CSharp) Method

        private static void DrawGradientBack(Graphics g,
                                             Rectangle backRect,
                                             GradientItemColors colors)
        {
            // Reduce rect draw drawing inside the border
            backRect.Inflate(-1, -1);

            int y2 = backRect.Height / 2;
            Rectangle backRect1 = new Rectangle(backRect.X, backRect.Y, backRect.Width, y2);
            Rectangle backRect2 = new Rectangle(backRect.X, backRect.Y + y2, backRect.Width, backRect.Height - y2);
            Rectangle backRect1I = backRect1;
            Rectangle backRect2I = backRect2;
            backRect1I.Inflate(1, 1);
            backRect2I.Inflate(1, 1);

            using (LinearGradientBrush insideBrush1 = new LinearGradientBrush(backRect1I, colors.InsideTop1, colors.InsideTop2, 90f),
                                       insideBrush2 = new LinearGradientBrush(backRect2I, colors.InsideBottom1, colors.InsideBottom2, 90f))
            {
                g.FillRectangle(insideBrush1, backRect1);
                g.FillRectangle(insideBrush2, backRect2);
            }

            y2 = backRect.Height / 2;
            backRect1 = new Rectangle(backRect.X, backRect.Y, backRect.Width, y2);
            backRect2 = new Rectangle(backRect.X, backRect.Y + y2, backRect.Width, backRect.Height - y2);
            backRect1I = backRect1;
            backRect2I = backRect2;
            backRect1I.Inflate(1, 1);
            backRect2I.Inflate(1, 1);

            using (LinearGradientBrush fillBrush1 = new LinearGradientBrush(backRect1I, colors.FillTop1, colors.FillTop2, 90f),
                                       fillBrush2 = new LinearGradientBrush(backRect2I, colors.FillBottom1, colors.FillBottom2, 90f))
            {
                // Reduce rect one more time for the innermost drawing
                backRect.Inflate(-1, -1);

                y2 = backRect.Height / 2;
                backRect1 = new Rectangle(backRect.X, backRect.Y, backRect.Width, y2);
                backRect2 = new Rectangle(backRect.X, backRect.Y + y2, backRect.Width, backRect.Height - y2);

                g.FillRectangle(fillBrush1, backRect1);
                g.FillRectangle(fillBrush2, backRect2);
            }
        }