我怎样才能在图像上引入一个覆盖

问题描述

如何处理图像添加半透明的1x1检查覆盖像C＃中的第二个图像。

How can I manipulate images to add a semi-transparent 1x1 checked overlay like the second image in C#?

推荐答案

我可以修改答案，我发布了一段时间了，在代码中创建覆盖。创建覆盖图像之后，我使用了一个的TextureBrush 来填补原始图像的区域。下面代码中的设置创建下面的图像;你可以改变大小和颜色，以满足您的需求。

I was able to modify an answer I posted a while ago and create the overlay in code. After the overlay image is created, I use a TextureBrush to fill the area of the original image. The settings in the code below created the following image; you can change the size and colors to suit your needs.

// set the light and dark overlay colors
Color c1 = Color.FromArgb(80, Color.Silver);
Color c2 = Color.FromArgb(80, Color.DarkGray);

// set up the tile size - this will be 8x8 pixels, with each light/dark square being 4x4 pixels
int length = 8;
int halfLength = length / 2;

using (Bitmap overlay = new Bitmap(length, length, PixelFormat.Format32bppArgb))
{
    // draw the overlay - this will be a 2 x 2 grid of squares,
    // alternating between colors c1 and c2
    for (int x = 0; x < length; x++)
    {
        for (int y = 0; y < length; y++)
        {
            if ((x < halfLength && y < halfLength) || (x >= halfLength && y >= halfLength))
                overlay.SetPixel(x, y, c1);
            else
                overlay.SetPixel(x, y, c2);
        }
    }

    // open the source image
    using (Image image = Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\homers_brain.jpg"))
    using (Graphics graphics = Graphics.FromImage(image))
    {
        // create a brush from the overlay image, draw over the source image and save to a new image
        using (Brush overlayBrush = new TextureBrush(overlay))
        {
            graphics.FillRectangle(overlayBrush, new Rectangle(new Point(0, 0), image.Size));
            image.Save(@"C:\Users\Public\Pictures\Sample Pictures\homers_brain_overlay.jpg");
        }
    }
}

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