Show/Move Picture Command Visualizer

[zimberzimber]

Is your feature request related to a problem? Please describe.
Getting the right coordinates for an image you want to display can be a pain in the ass, especially when movement and zoom are involved.

Describe the solution you'd like
The show/move picture command window could have an expandable section where you can select a rectangle on the image itself instead of inputting raw numbers, so that the program will do the calculations for the user.

Describe alternatives you've considered
Opening an image editor and a calculator to do the calculations yourself.