How do I add Attack Range to Simple Grid EasyStar by Magistross ?

Hello,

Right now I'm using Easystar and Magistross code for a simple grid movement like Fire Emblem.

construct.net/en/forum/game-development/game-development-design-ideas-25/simple-grid-movement-128763

(Source here :

construct.net/out

I wanted to add another system to it, by automaticly add another boxe to the movements boxes, to represent the attack zone from the player.

Exemple here :

(Dots line are the zone where the player can attack.)

Saddly I didn't know how to do that by having an hundred of calculation, I'm sure they is a simple way, but I just can't get it.

Hope you will be able to help me.

Thanks!