[Need Info] Restrict movement to circular region

[Zhall]

What would be the easiest way to limit a unit's movement to a circular region?

I believe I can achieve this by checking that the point the unit is being sent to is withing a, say, 256 circular region from where the unit is located...

I also need a way to graphically show this, something around the range indicator for an ability would work, or some splat borrowed from a AOE image may work.

I am considering also making a circle from special effects, as was done in warcraft 3.

I'm new to sc2 modding, so I'm sure theres some easy way to do this.

Thanks

 

[Dr Super Good]

Use a circular region. When your unit moves outside it pull it back in. Enter and leave events work as usual.

256 circular region

That is the size of the entire map... SC2 maps are only 256*256 units in size at most with each tile being exactly 1 unit in width and height.

You should be able to make the region visible in-game so it appears as a map overlay. Or maybe that is just for points.

 

[Zhall]

Actually I found an overlay that the point defense drone uses, that would look nice, just unsure of how to implement it.

And.. I'm used to the point system in wc3, didn't know it wasn't counter intutive in sc2 aswell lol

 

[Dr Super Good]

And.. I'm used to the point system in wc3, didn't know it wasn't counter intutive in sc2 aswell lol

It is pretty intuitive. I mean unlike WC3 where each tile was 128 units, in SC2 each tile is 1!

If you want to use an overlay you will need an actor for it. Actors are asynchronous objects that are used by the graphics system of SC2. All ability overlays and things are actors. This can be trigger created using appropriate actor actions. Locally controlled trigger actors is more difficult last I checked with the only way being some kind of hacky workaround using flyer circles (the circles used to help show users where a flying unit is physically).