系统绘制反转区域超出路径构建 [英] System Drawing Invert Region build out of Path

问题描述

我有一个面板，我在那个面板上画了一颗心。.
但是我没有想画心我想画除了心的所有东西，所以心是透明的。
我可以反转从 Path 路径中选择的 Region 吗？

Ive got a panel and im drawing a heart on that panel.. But i dont want to draw the heart i want to draw everything except the heart so the heart is transparent. Can i invert the Region selected out of the Path?

System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
            path.AddArc(0, 0, (this.Width / 2), (this.Height / 2), 135, 195);
            path.AddArc((this.Width / 2), 0, (this.Width / 2), (this.Height / 2), 210, 195);
            path.AddLine((this.Width / 2), this.Height, (this.Width / 2), this.Height);
            this.Region = new Region(path);
            this.BackColor = Color.Black;

看起来像什么（白色=透明）：

What it looks like(white = transparent):

我希望它看起来像什么（白色=透明）：

What i want it to look like(white = transparent):

推荐答案

我认为您可以将两个图形路径加在一起。

I think you can just add 2 graphics paths together.

您可以尝试以下代码：

private void panel1_Paint(object sender, PaintEventArgs e)
{
    GraphicsPath path = new GraphicsPath();
    path.AddArc(0, 0, (this.Width / 2), (this.Height / 2), 135, 195);
    path.AddArc((this.Width / 2), 0, (this.Width / 2), (this.Height / 2), 210, 195);
    path.AddLine((this.Width / 2), this.Height, (this.Width / 2), this.Height);

    GraphicsPath path2 = new GraphicsPath();
    path2.AddRectangle(new Rectangle(new Point(0, 0), panel1.Size));

    path2.AddPath(path, false);

    e.Graphics.FillPath(Brushes.Black, path2);
}

结果是：

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