C＃：调整图像大小时缩放图形的问题

Question

I'd have a program that will allow you to draw lines over an image which will eventually be used for calculating distance .

To make things simple, my current image (which is in a PictureBox) is an image of a ruler. When you left click, a path is created and drawn.

Originally, to zoom in, I had it so that a new bitmap would be created with the images new size and I was able to use Graphics.ScaleTransform and it worked fine but it would just crop the image.

I needed the image to actually change width and height so now what I'm doing is just adding/subtracting a constant zoom amount to the width & height when zooming in/out.

With this approach, I can't seem to scale the graphics and the paths are skewed into different directions and not the right size when the image is zoomed in. I completely understand why this is happening, because the image is getting larger and the graphics are staying the same, I just need whatever math is required to scale the graphics.

I've tried using Graphics.ScaleTransform as well as moving the graphics x & y to their current position + the current zoom amount (offset)

Answer 1

按照@TaW的指示，我更改了缩放功能，以根据所应用的任何缩放来计算新的宽度和高度，然后创建一个新的位图，其中包含具有新宽度和高度的原始图像。