Unit comes within range question

[Flux]

What if I have a trigger with this event

• Unit - A unit comes within 256.00 of Unit1
• Unit - A unit comes within 256.00 of Unit2
• Unit - A unit comes within 256.00 of Unit3

and the trigger runs,
how can I detect the unit (unit1, unit2, or unit3) that causes the trigger to run?

 

[IcemanBo]

Sadly you can't directly check it with this event.
There is need to do a work-around for this.

For example, you can pick all units in range
by yourself each 0.1 seconds for unit1/2/3.

 

[Arad MNK]

Triggers

• Untitled Trigger 001
  • Events
    • Unit - A unit comes within 256.00 of Unit1
    • Unit - A unit comes within 256.00 of Unit2
    • Unit - A unit comes within 256.00 of Unit3
  • Conditions
  • Actions
    • Set Tiggering_Unit = (Triggering unit)
    • Set Temp_Point = (Position of Unit1)
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • (Tiggering_Unit is in (Units within 256.00 of Temp_Point)) Equal to True
      • Then - Actions
        • -------- Whatever actions --------
        • Set Temp_Point = (Position of Unit2)
        • Custom script: call RemoveLocation (udg_Temp_Point)
      • Else - Actions
        • Custom script: call RemoveLocation (udg_Temp_Point)
        • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
          • If - Conditions
            • (Tiggering_Unit is in (Units within 256.00 of Temp_Point)) Equal to True
          • Then - Actions
            • -------- Whatever actions --------
            • Set Temp_Point = (Position of Peasant Unit3)
          • Else - Actions
            • Custom script: call RemoveLocation (udg_Temp_Point)
            • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
              • If - Conditions
                • (Tiggering_Unit is in (Units within 256.00 of Temp_Point)) Equal to True
              • Then - Actions
                • -------- Whatever actions --------
              • Else - Actions
    • Custom script: set udg_Triggering_Unit = null

This however might not work when Triggering_Unit Enters The Exact Collide point between Units. This can be Avoided by setting the units far from eachother.

 

[Zwiebelchen]

If you enumerate the units again after the event fired, just to find the unit triggering it, why even use the event in the first place?

You can just enumerate periodically then and be done with it.

Also remember that "Unit comes within range of Unit" event is:
1) not instant
2) internally works by periodically enumerating all units in range anyway (at a timeout roughly between 0.05 and 0.1 seconds).


Conclusion: Don't use this event. Enumerate periodically.

 

[Flux]

1) not instant
2) internally works by periodically enumerating all units in range anyway (at a timeout roughly between 0.05 and 0.1 seconds).

How did you know that?

 

[Zwiebelchen]

How did you know that?

You can easily measure the delay by instantly moving the unit in range and starting a timer at the same time, then check the remaining timer duration as soon as the event fires.

Also, using this event on many units noticably slows the map down, which is a giveaway for periodic calculations.

I expect it to be a little bit faster than periodic enumeration, simply because it operates at a lower level (not on the JASS layer, but on the native layer), but considering you can not get the entering unit easily, it's not worth using it unless you don't care about the entering unit at all.

 

[Wietlol]

I think it might be better to create a new trigger for unit1, unit2 and unit3 and store the unit1, unit2 and unit3 on the trigger which fires for those units in a hashtable.
In that case, you can make that new trigger run this trigger and you save the unit in a global variable.

The creation of these triggers has to be done in JASS though.

Also, do you only need this for unit1, unit2 and unit3 or will there be more units?

 

[Flux]

Also, do you only need this for unit1, unit2 and unit3 or will there be more units?

There will be more units. I just did a periodic check and decided to not use the event.

 

[Wietlol]

Yea, that would work...
My idea about one trigger for each unit would have been quite amazing though.
However, you do require JASS knowledge to make the filter... pretty much nothing more