GML Rts box select units

[Warspite2]

I believe I seen a thread on this years ago, it may have been in the legacy forums because im not finding it here. I am working on a rts title and want to be able to select multiple units at once using a box select. Anyone have tips on how I can get this working?

 

[Nidoking]

I expect you'd create a rectangular instance that resizes as you drag the cursor, then use instance_place_list to get the list of units that the rectangle touches when you release the button.

 

[Alexx]

@YellowAfterlife did a great example a few years back:
https://yal.cc/gamemaker-strategy-unit-selection/

I have an example for GMS2, I can upload it if you need it.