C# 用GDI+勾勒出一条路径；在.Net中

如何使用GDI+勾勒graphicspath？例如，我将两个相交的矩形添加到GraphicsPath。我只想画出这个图形的轮廓

请注意，我不想填充该区域，我只想绘制轮廓

例如：

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我自己无法尝试，但我认为您应该使用图形的交点创建一个区域对象，然后使用API。
这是它的：

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附言：如果这有效，请发布你的解决方案，我很好奇：）

没有管理好的方法来做大纲。然而，GDI+确实有一个名为GdipWindingModeOutline的函数，可以完全做到这一点。 此代码实现以下功能：

// Declaration required for interop
[DllImport(@"gdiplus.dll")]
public static extern int GdipWindingModeOutline( HandleRef path, IntPtr matrix, float flatness );

void someControl_Paint(object sender, PaintEventArgs e)
{
    // Create a path and add some rectangles to it
    GraphicsPath path = new GraphicsPath();
    path.AddRectangles(rectangles.ToArray());

    // Create a handle that the unmanaged code requires. nativePath private unfortunately
    HandleRef handle = new HandleRef(path, (IntPtr)path.GetType().GetField("nativePath", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(path));
    // Change path so it only contains the outline
    GdipWindingModeOutline(handle, IntPtr.Zero, 0.25F);
    using (Pen outlinePen = new Pen(Color.FromArgb(255, Color.Red), 2))
    {
        g.DrawPath(outlinePen, path);
    }
}

// Declaration required for interop
[DllImport(@"gdiplus.dll")]
public static extern int GdipWindingModeOutline( HandleRef path, IntPtr matrix, float flatness );

void someControl_Paint(object sender, PaintEventArgs e)
{
    // Create a path and add some rectangles to it
    GraphicsPath path = new GraphicsPath();
    path.AddRectangles(rectangles.ToArray());

    // Create a handle that the unmanaged code requires. nativePath private unfortunately
    HandleRef handle = new HandleRef(path, (IntPtr)path.GetType().GetField("nativePath", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(path));
    // Change path so it only contains the outline
    GdipWindingModeOutline(handle, IntPtr.Zero, 0.25F);
    using (Pen outlinePen = new Pen(Color.FromArgb(255, Color.Red), 2))
    {
        g.DrawPath(outlinePen, path);
    }
}