How to damage units in a line through trigger(GUI)?

[elm0]

What's the most efficient way? I need to trigger the damage because it depends on the unit's attribute

 

[rulerofiron99]

The most efficient way would be to pick units in a rectangle coming from the hero, but this will make the damage instant which you might not want if you're using a projectile.

A simpler method would be to spawn a dummy unit for the projectile, and use a looping trigger to move it forwards and damage units around it. After a unit has been damaged, add it to a unit group so that it won't be damaged again by this instance.

 

[elm0]

Ohh I also thought of doing the simpler method you mentioned. But wont it cause lag because it uses 2 unit groups and it loops every x seconds?


Just out of curiosity, how do you do the rectangle method?

 

[Ceday]

That method is fine, you can also create a dummy unit, order dummy unit to cast a carrion swarm, when a unit takes damage and if damager unit is carrion dummy also deal your damage based on attribute.

 

[rulerofiron99]

^ Another neat method.

The dummy method I mentioned won't be very laggy. Easily 100+ instances without significant frame rate loss.

To check the rectangle, here are some cool methods: http://math.stackexchange.com/questions/190111/how-to-check-if-a-point-is-inside-a-rectangle
And more: http://stackoverflow.com/questions/2752725/finding-whether-a-point-lies-inside-a-rectangle-or-not

 

[elm0]

Nice! Thanks for he help! + REP