如何在 C# 中放大和缩小图像？
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How to zoom an image in&out in C#?
提问by Mehmet Ince
I want to implement zoom for an image. I don't want to resize the PictureBox, but the image itself.
我想对图像实现缩放。我不想调整PictureBox 的大小，而是调整图像本身。
How do I do this?
我该怎么做呢？
采纳答案by Thorsten Dittmar
One solution is:
一种解决方案是：
- Create new image of the desired size (for example 200% or 50% of original image size)
- Draw original image to new image using Graphics.DrawImage(Image, Rectangle);, which draws the given image to the new image at the given position with the given size
- Set new image as source for the
PictureBox
- 创建所需尺寸的新图像（例如原始图像尺寸的 200% 或 50%）
- 使用Graphics.DrawImage(Image, Rectangle) 将原始图像绘制为新图像；, 将给定的图像绘制到给定位置的给定大小的新图像上
- 将新图像设置为源
PictureBox
Another way is to simple create a new bitmap instance like that:
另一种方法是简单地创建一个新的位图实例，如下所示：
Size newSize = new Size((int)(originalBitmap.Width * zoomFactor), (int)(originalBitmap.Height * zoomFactor));
Bitmap bmp = new Bitmap(originalBitmap, newSize);
回答by Thorsten Dittmar
I used a web browser to achieve this.
我使用网络浏览器来实现这一点。
//loads the image
myWebBrowser.Navigate(@"C:\myimage.png");
From there I used SendKeys to zoom in and out
从那里我使用 SendKeys 来放大和缩小
myWebBrowser.Select(); //Selects browser.
SendKeys.Send("^{+}"); //Sends the control + key combo, causing the browser to zoom in. Replace the "+" with a "-" to zoom out.
It's a bit of a weird method, but it worked really well for me. I hope you find this helpful!
这是一个有点奇怪的方法，但它对我来说非常有效。我希望你觉得这有用！
