我如何绘制一个矩形到图像具有透明度和文字 [英] How do I draw a rectangle onto an image with transparency and text

问题描述

这是我的第一个基于图形项目，并开始与我需要能够绘制一个矩形到具有透明度和文本的位图。

This is my first graphics based project and to begin with I need to be able to draw a rectangle onto a bitmap with transparency and text.

我不知道从哪里开始与此有关。我已经做了一些研究，但似乎无法找到一篇文章，让我到一个半透明的矩形添加到图像。

I'm not sure where to begin with this. I've done a little research but can't seem to find an article that will allow me to add a semi transparent rectangle to an image.

我将是我需要能够操纵的图像流。

What I will have is an image stream that I need to be able to manipulate.

可有人请点我在这个正确的方向？

Can someone please point me in the right direction for this?

与源站点将是巨大的，因为我从来没有做过任何GDI的工作。

A site with source would be great as I have never done any GDI work before.

推荐答案

您可以尝试这样的事情：

You can try something like this:

// Load the image (probably from your stream)
Image image = Image.FromFile( imagePath );

using (Graphics g = Graphics.FromImage(image))
{
   // Modify the image using g here... 
   // Create a brush with an alpha value and use the g.FillRectangle function
}

image.Save( imageNewPath );

编辑：代码创建一个半透明度灰刷

the code to create a semi transparency gray brush

Color customColor = Color.FromArgb(50, Color.Gray);
SolidBrush shadowBrush = new SolidBrush(customColor);
g.FillRectangles(shadowBrush, new RectangleF[]{rectFToFill});

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