如何在C#中放大和缩小图像? [英] How to zoom an image in&out in C#?

问题描述

我想对图像进行缩放.我不想调整 PictureBox ，但图像本身.

I want to implement zoom for an image. I don't want to resize the PictureBox, but the image itself.

我该怎么做?

推荐答案

一种解决方案是:

1. 创建所需尺寸的新图像(例如原始图像尺寸的200％或50％)
2. 使用 Graphics.DrawImage(Image，Rectangle)将原始图像绘制为新图像. ，它将给定图像以给定大小绘制到给定位置的新图像上
3. 将新图像设置为PictureBox
的源

1. Create new image of the desired size (for example 200% or 50% of original image size)
2. 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
3. Set new image as source for the PictureBox

另一种方法是像这样简单地创建一个新的位图实例:

Another way is to simple create a new bitmap instance like that:

Size newSize = new Size((int)(originalBitmap.Width * zoomFactor), (int)(originalBitmap.Height * zoomFactor));
Bitmap bmp = new Bitmap(originalBitmap, newSize);

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