How can/should I do this?

[cowmenace]

I need an item that a hero can buy, and when the hero uses the item, it places something on the ground, then 10 seconds later runs some actions in a trigger that use the position of the thing on the ground. I need it to be MPI. The effect I'm trying to get is a hero buys an artillery strike, places a marker on the ground, then in 10 seconds the artillery strike comes in on the marker

 

[SarChasm]

Make your item based off the Tiny Farm item. Then give the building it produces, let's call it a "Beacon," an ability based off Channel. Let's call this ability "Call Airstrike."

Give Call Airstrike an "Instant (No Target)" Target Type, and a cast time of 10 seconds.

Then make a trigger that goes something like:
Event: A unit finishes constructing
Condition: The unit is a Beacon
Actions: Order unit to use Call Airstrike

Then another trigger:
Event: A unit casts an ability
Condition: The ability is Call Airstrike
Actions: Put your airstrike actions here. If this is what you needed help with as well, just say so.

 

[Ayanami]

You can use this. This basically deals damage after 10 seconds in an AoE of 500. I based the spell on Channel with point target. Then I gave it to an item.

Variables
Caster - Unit Array (10)
CustomValue - Integer
Dummy - Unit Array (10)
DummyGroup - Unit Group
RealTimer - Real Array (10)
TargetPoint - Point Array (10)
TempInt - Integer
TempPoint - Point
UnitGroup - Unit Group Array (10)

• Marker
  • Events
    • Unit - A unit Starts the effect of an ability
  • Conditions
    • (Ability being cast) Equal to Marker
  • Actions
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • CustomValue Less than 10
      • Then - Actions
        • Set CustomValue = (CustomValue + 1)
      • Else - Actions
        • Set CustomValue = 1
    • Set Caster[CustomValue] = (Triggering unit)
    • Set TargetPoint[CustomValue] = (Target point of ability being cast)
    • Set RealTimer[CustomValue] = 10.00
    • Unit - Create 1 Marker Dummy for (Owner of Caster[CustomValue]) at TargetPoint[CustomValue] facing Default building facing degrees
    • Set Dummy[CustomValue] = (Last created unit)
    • Set TempPoint = (Center of (Playable map area))
    • Unit - Create 1 Hidden Dummy for (Owner of Caster[CustomValue]) at TempPoint facing Default building facing degrees
    • Unit - Set the custom value of (Last created unit) to CustomValue
    • Unit Group - Add (Last created unit) to DummyGroup
    • Custom script: call RemoveLocation(udg_TempPoint)

• Marker Periodic
  • Events
    • Time - Every 0.10 seconds of game time
  • Conditions
    • (DummyGroup is empty) Equal to False
  • Actions
    • Unit Group - Pick every unit in DummyGroup and do (Actions)
      • Loop - Actions
        • Set TempInt = (Custom value of (Picked unit))
        • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
          • If - Conditions
            • RealTimer[TempInt] Less than or equal to 0.00
          • Then - Actions
            • Set UnitGroup[TempInt] = (Units within 500.00 of TargetPoint[TempInt] matching ((((Matching unit) is Magic Immune) Equal to False) and ((((Matching unit) is alive) Equal to True) and (((Matching unit) belongs to an enemy of (Owner of Caster[TempInt])) Equal to True))))
            • Unit Group - Pick every unit in UnitGroup[TempInt] and do (Actions)
              • Loop - Actions
                • Unit - Cause Dummy[TempInt] to damage (Picked unit), dealing 500.00 damage of attack type Spells and damage type Normal
            • Special Effect - Create a special effect at TargetPoint[TempInt] using Objects\Spawnmodels\Other\NeutralBuildingExplosion\NeutralBuildingExplosion.mdl
            • Special Effect - Destroy (Last created special effect)
            • Unit - Remove Dummy[TempInt] from the game
            • Unit - Remove (Picked unit) from the game
            • Custom script: call RemoveLocation(udg_TargetPoint[udg_TempInt])
            • Custom script: call DestroyGroup(udg_UnitGroup[udg_TempInt])
          • Else - Actions
            • Set RealTimer[TempInt] = (RealTimer[TempInt] - 0.10)

Hope this helps

 

[Squirel]

Why not just make the item summon a ward with a timed life and a trigger to damage area when that unit dies with a special effect to get the animation?

 

[cowmenace]

Thank you so much SarChasm and Glenphir!!!
I'm awful with the object editor so I don't know how to do that last idea... Appreciate your guys' help =)

 

[SarChasm]

Y'know, actually, the last idea might be the most efficient. Funny how people tend to over complicate things when they start learning more.