绘制低透明度一个填充矩形 [英] Draw a Fill Rectangle with low opacity

问题描述

我有一个在C＃中language.I Windows窗体应用程序的图片一个PictureBox想picturebox.but的某个位置我还需要看到图像的图像box.how可我画这个矩形的低透明度，看图片框

I a have a PictureBox with a picture in a Windows Form application in C# language.I want draw a FillRectangle in some location of picturebox.but i also need to see picture of picture box.how can i draw this rectangle with low opacity to see image of picturebox?

推荐答案

你的意思的形象：

using (Graphics g = Graphics.FromImage(pb.Image))
{
    using(Brush brush = new SolidBrush(your_color))
    {
        g.FillRectangle(brush , x, y, width, height);
    }
}

也可以使用

or you can use

Brush brush = new SolidBrush(Color.FromArgb(alpha, red, green, blue))

其中的字母的从0到255，所以128的阿尔法值会给你50％
opactity。

where alpha goes from 0 to 255, so a value of 128 for your alpha will give you 50% opactity.

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