Question

I need to find a control on screenshot. I have its screen coordinates. How can I convert them to coordinates on screenshot?

Answer 1

It all depends on the size of the screenshot and the size of your current resolution.

Let’s say the screenshot is 800×600, but your current screen resolution is 1280×720. In order to find out the X,Y position on a 800×600 image, you need to normalize the values you have of X,Y on a 1280×720 screen.

normalized_x = (x * 800) / 1280;
normalized_y = (y * 600) / 720;

Note that the object you are looking for is also smaller on a 800×600 image. So:

// w and h represents the size of the object at 1280x720
normalized_w = (w * 800) / 1280; 
normalized_h = (h * 600) / 720;