Need help creating trigger for checking number of alive units

[Foxace]

I need trigger for boss checking number of alive units when enemies enter region.

Boss should summon 8 units, I have custom summon skeleton item. The number of summoned units should drop by 2 for each destroyed "towers". There are 4 towers in total.

 

[Nichilus]

One way is to do it like this:

• Untitled Trigger 001
  • Events
    • Unit - Scout Tower 0000 <gen> Dies
    • Unit - Scout Tower 0001 <gen> Dies
    • Unit - Scout Tower 0002 <gen> Dies
    • Unit - Scout Tower 0003 <gen> Dies
  • Conditions
  • Actions
    • Set Alive_Towers = (Alive_Towers - 1)

with "Alive_Towers" being an integer variable that starts with value 4.
Then you just check the number in there.

Other options is to count all alive towers using unit group

• Untitled Trigger 001
  • Events
    • Unit - A unit enters Region 000 <gen>
  • Conditions
  • Actions
    • Set group = (Units in (Playable map area) matching (((Unit-type of (Matching unit)) Equal to Scout Tower) and (((Matching unit) is alive) Equal to True)))
    • Set Alive_Towers = (Number of units in group)
    • Custom script: call DestroyGroup(udg_group)

Alive_Towers is integer variable, "group" is unit group variable.
You don't even need "Alive_Towers" variable in this trigger, I just used it to show how to get number of units in group.

 

[Foxace]

How to set variable to equal (alive_towers - 1)

 

[Maker]

Arithmetic operation.

 

[Foxace]

Boss still summons 8 units even though only 3/4 towers are alive. It shouldnt use the 8 unit item but instead 6 unit item which is separate item.

 

[deathismyfriend]

Show us your triggers for spawning the units...

 

[Foxace]

• Unit - A unit enters region
• Triggering unit belongs to an enemy of player 1
• alive towers equal to 4
• hero - summon treant and give it to boss
• hero - order boss to use last created item

That trigger still activates even if 3/4 towers are alive

 

[Nichilus]

It seems you incorrectly decrease "alive towers" value when one of them dies.

 

[Foxace]

Trigger is identical to one in this topic

 

[Nichilus]

Yes, but you need another trigger, for example the first one I posted in post #2, where when specific unit dies, an action "Set alive towers = alive towers -1" is used.

Else if you don't decrease the value "alive towers", it will still be 4, no matter how many towers are destroyed.

 

[Foxace]

They are in separate triggers

 

[Nichilus]

yes, and I guess the error is in that other trigger, because from the trigger you posted in post #7, there is simply nothing that could go wrong.

 

[Foxace]

The trigger is 100% identical to trigger in this thread

I managed to get it work with number of living units owned by player

But how to stop trigger looping? it continues to give the item as long as unit is in the region.

 

[Nichilus]

• Trigger - Turn off (This trigger)

 

[Foxace]

Trigger needs to activate again after summoned units expire

 

[Nichilus]

• Trigger - Turn on *Your trigger*

You can use a timer and when that timer expires, you turn on that trigger via the action above.