在位图周围绘制边框 [英] Draw border around bitmap

问题描述

我的代码中有一个System.Drawing.Bitmap.

宽度是固定的，高度是变化的.

The width is fix, the height varies.

我想做的是在位图周围的所有4个边缘上添加一个白色边框，大约20个像素.

What I want to do, is to add a white border around the bitmap, with about 20 pixel, to all 4 edges.

这将如何工作?

推荐答案

您可以在位图后面绘制一个矩形.矩形的宽度为(Bitmap.Width + BorderWidth * 2)，位置为(Bitmap.Position-new Point(BorderWidth，BorderWidth)).或者至少这就是我要解决的方法.

You could draw a rectangle behind the bitmap. The width of the rectangle would be (Bitmap.Width + BorderWidth * 2), and the position would be (Bitmap.Position - new Point(BorderWidth, BorderWidth)). Or at least that's the way I'd go about it.

这是一些实际的源代码，说明了如何实现它(如果您要使用专用的方法来绘制图像):

Here is some actual source code explaining how to implement it (if you were to have a dedicated method to draw an image):

private void DrawBitmapWithBorder(Bitmap bmp, Point pos, Graphics g) {
    const int borderSize = 20;

    using (Brush border = new SolidBrush(Color.White /* Change it to whichever color you want. */)) {
        g.FillRectangle(border, pos.X - borderSize, pos.Y - borderSize, 
            bmp.Width + borderSize, bmp.Height + borderSize);
    }

    g.DrawImage(bmp, pos);
}

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