GitUI.RevisionGrid.DrawHeadBackground C# (CSharp) Method

        private float DrawHeadBackground(bool isSelected, Graphics graphics, Color color,
            float x, float y, float width, float height, float radius, ArrowType arrowType, bool dashedLine, bool fill)
        {
            float additionalOffset = arrowType != ArrowType.None ? GetArrowSize(height) : 0;
            width += additionalOffset;
            var oldMode = graphics.SmoothingMode;
            graphics.SmoothingMode = SmoothingMode.AntiAlias;

            try
            {
                // shade
                if (fill)
                    using (var shadePath = CreateRoundRectPath(x + 1, y + 1, width, height, radius))
                    {
                        var shadeBrush = isSelected ? Brushes.Black : Brushes.Gray;
                        graphics.FillPath(shadeBrush, shadePath);
                    }

                using (var forePath = CreateRoundRectPath(x, y, width, height, radius))
                {
                    Color fillColor = Lerp(color, Color.White, 0.92F);

                    if (fill)
                        using (var fillBrush = new LinearGradientBrush(new RectangleF(x, y, width, height), fillColor, Lerp(fillColor, Color.White, 0.9F), 90))
                            graphics.FillPath(fillBrush, forePath);
                    else if (isSelected)
                        graphics.FillPath(Brushes.White, forePath);

                    // frame
                    using (var pen = new Pen(Lerp(color, Color.White, 0.83F)))
                    {
                        if (dashedLine)
                            pen.DashPattern = dashPattern;

                        graphics.DrawPath(pen, forePath);
                    }

                    // arrow if the head is the current branch
                    if (arrowType != ArrowType.None)
                        DrawArrow(graphics, x, y, height, color, arrowType == ArrowType.Filled);
                }
            }
            finally
            {
                graphics.SmoothingMode = oldMode;
            }

            return additionalOffset;
        }