我正在尝试在 GDI+ (C#) 中绘制自定义阴影。我一直有这种尴尬的表情：
我想我可以通过在弧的宽度上添加一个像素来解决它，但是形状会重叠。 预览 http://puu.sh/2sv2N
我完全不知道是什么导致了这小块白色。
这是我的代码：
Rectangle drawRect = new Rectangle(10, 10, 400, 400);
radius = 10;
// TOP //
Rectangle topRect = new Rectangle(drawRect.X + radius, drawRect.Y, drawRect.Width - 2 * radius, radius);
LinearGradientBrush topBrush = new LinearGradientBrush(new Rectangle(topRect.X, topRect.Y - 1, topRect.Width,topRect.Height + 2), firstColor, secondColor, 270f);
g.FillRectangle(topBrush, topRect);
topBrush.Dispose();
// LEFT //
Rectangle leftRect = new Rectangle(drawRect.X, drawRect.Y + radius, radius, drawRect.Height - 2 * radius);
LinearGradientBrush leftBrush = new LinearGradientBrush(new Rectangle(leftRect.X - 1, leftRect.Y, leftRect.Width + 2, leftRect.Height), firstColor, secondColor, 180f);
g.FillRectangle(leftBrush, leftRect);
leftBrush.Dispose();
// TOP LEFT //
GraphicsPath topLeftPath = new GraphicsPath();
topLeftPath.StartFigure();
topLeftPath.AddArc(new Rectangle(drawRect.X, drawRect.Y, 2 * radius, 2 * radius), 180, 90);
topLeftPath.AddLine(new Point(drawRect.X + radius, drawRect.Y), new Point(drawRect.X + radius, drawRect.Y + radius));
topLeftPath.AddLine(new Point(drawRect.X + radius, drawRect.Y + radius), new Point(drawRect.X, drawRect.Y + radius + 1));
topLeftPath.CloseFigure();
PathGradientBrush topLeftBrush = new PathGradientBrush(topLeftPath);
topLeftBrush.CenterPoint = new PointF(drawRect.X + radius, drawRect.Y + radius);
topLeftBrush.CenterColor = firstColor;
topLeftBrush.SurroundColors = new Color[] { secondColor };
g.FillPath(topLeftBrush, topLeftPath);
topLeftBrush.Dispose();
topLeftPath.Dispose();
提前致谢