设置圆角矩形每个角的半径？

Question

这是使表格圆角化的源代码，

但我怎样才能在每个角落设置自己的半径？

[DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
        private static extern IntPtr CreateRoundRectRgn
        (
            int nLeftRect, // x-coordinate of upper-left corner
            int nTopRect, // y-coordinate of upper-left corner
            int nRightRect, // x-coordinate of lower-right corner
            int nBottomRect, // y-coordinate of lower-right corner
            int nWidthEllipse, // height of ellipse
            int nHeightEllipse // width of ellipse
         );

        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

Region = System.Drawing.Region.FromHrgn(CreateRoundRectRgn(0, 0, 405, 546, 20, 20));

我只想左上角四舍五入。

Answer 1

您可以自己创建。

使用GraphicsPath，然后使用constructor overload转换为Region，GraphicsPath

using (GraphicsPath gfxPath = new GraphicsPath())
{
    int d = CornerRadius * 2;
    gfxPath.AddArc(Bounds.Left, Bounds.Top, d, d, 180, 90);
    gfxPath.AddLine(Bounds.Right, Bounds.Top, Bounds.Right, Bounds.Bottom);
    gfxPath.AddLine(Bounds.Right, Bounds.Bottom, Bounds.Left, Bounds.Bottom);
    gfxPath.CloseAllFigures();
    region = new Region(gfxPath);
}