How to check unit type in a group?

fallenangel332 · May 14, 2024

Lets say in a unit group i have A B C and A
I only want to pick A B C and leaves A
For more detail, i want to upgrade my tower like in Gem TD
Thats mean i want destroy the component after i upgrade the tower but i ran into the issue of destroying unused or extra component i got left
Please help
Also i can only do it in GUI, i know nothing about Jass

Uncle · May 14, 2024

fallenangel332 said:
I only want to pick A B C and leaves A

Hello, you're looking for the If Then Else Action which let's you ask questions anywhere in your Actions:

So when you're looping over your Unit Group you would ask the question, what type of unit is this?

Actions
- Unit Group - Pick every unit in YOUR_UNIT_GROUP and do (Actions)
  - Loop - Actions
    - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      - If - Conditions
        
        (Unit-type of (Picked unit)) Equal to Guard Tower
      - Then - Actions
        
        Unit - Kill (Picked unit)
      - Else - Actions

^ That will kill all of the Guard Towers inside of the Unit Group.

This version will kill all of the Guard Towers and Cannon Towers by asking if it's one OR the other:

Actions
- Unit Group - Pick every unit in YOUR_UNIT_GROUP and do (Actions)
  - Loop - Actions
    - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      - If - Conditions
        
        Or - Any (Conditions) are true
        
        Conditions
        
        (Unit-type of (Picked unit)) Equal to Guard Tower
        
        (Unit-type of (Picked unit)) Equal to Cannon Tower
      - Then - Actions
        
        Unit - Kill (Picked unit)
      - Else - Actions

fallenangel332 · May 14, 2024

Uncle said:
Hello, you're looking for the If Then Else Action which let's you ask questions anywhere in your Actions:

View attachment 473047

So when you're looping over your Unit Group you would ask the question, what type of unit is this?

Actions

Unit Group - Pick every unit in YOUR_UNIT_GROUP and do (Actions)

Loop - Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

(Unit-type of (Picked unit)) Equal to Guard Tower

Then - Actions

Unit - Kill (Picked unit)

Else - Actions

^ That will kill all of the Guard Towers inside of the Unit Group.

This version will kill all of the Guard Towers and Cannon Towers by asking if it's one OR the other:

Actions

Unit Group - Pick every unit in YOUR_UNIT_GROUP and do (Actions)

Loop - Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

Or - Any (Conditions) are true

Conditions

(Unit-type of (Picked unit)) Equal to Guard Tower

(Unit-type of (Picked unit)) Equal to Cannon Tower

Then - Actions

Unit - Kill (Picked unit)

Else - Actions

View attachment 473048 View attachment 473049

Hi thanks for replying so fast

If i understand correctly
Your version of trigger unfortunately will kill all the extra tower i have
For Example:
If i have "2 Guard Tower" and "2 Cannon Tower" i will kill all of them by upgrade my tower "1 times" instead of i can upgrade "2 times"

Uncle · May 14, 2024

So how much of the trigger have you made already?

How To Post Your Trigger

TopHow To Post Your Triggers I've seen many and many members around the site who need help with their triggers but don't know how to post their triggers in a thread, especially the newcomers. Posting your triggers in a thread is very important when you're asking a help from other members to fix...

www.hiveworkshop.com

Or are you unsure of how to get started? Because I was under the impression that you already had the Unit Groups setup with the Units you needed.

Regardless, here's a trigger that COULD work:

Actions
- Set VariableSet Tower_Group_1 = (Units owned by (Triggering player) of type Guard Tower)
- Set VariableSet Tower_Group_2 = (Units owned by (Triggering player) of type Cannon Tower)
- Unit - Kill (Random unit from Tower_Group_1)
- Unit - Kill (Random unit from Tower_Group_2)

This will create two new Unit Groups, one containing all of your Guard Towers and another containing all of your Cannon Towers. It will then kill 1 from each group. Note that this assumes that the Player actually has at least 1 of each of these.

You can make sure that the groups aren't empty by doing this:

Actions
- Set VariableSet Tower_Group_1 = (Units owned by (Triggering player) of type Guard Tower)
- Set VariableSet Tower_Group_2 = (Units owned by (Triggering player) of type Cannon Tower)
- If (All Conditions are True) then do (Then Actions) else do (Else Actions)
  - If - Conditions
    - (Number of units in Tower_Group_1) Greater than 0
    - (Number of units in Tower_Group_2) Greater than 0
  - Then - Actions
    - Unit - Kill (Random unit from Tower_Group_1)
    - Unit - Kill (Random unit from Tower_Group_2)
    - -------- Do something special --------
  - Else - Actions

fallenangel332 · May 14, 2024

Uncle said:
So how much of the trigger have you made already?

How To Post Your Trigger

TopHow To Post Your Triggers I've seen many and many members around the site who need help with their triggers but don't know how to post their triggers in a thread, especially the newcomers. Posting your triggers in a thread is very important when you're asking a help from other members to fix...

www.hiveworkshop.com

Or are you unsure of how to get started? Because I was under the impression that you already had the Unit Groups setup with the Units you needed.

Regardless, here's a trigger that COULD work:

Actions

Set VariableSet Tower_Group_1 = (Units owned by (Triggering player) of type Guard Tower)

Set VariableSet Tower_Group_2 = (Units owned by (Triggering player) of type Cannon Tower)

Unit - Kill (Random unit from Tower_Group_1)

Unit - Kill (Random unit from Tower_Group_2)

This will create two new Unit Groups, one containing all of your Guard Towers and another containing all of your Cannon Towers. It will then kill 1 from each group. Note that this assumes that the Player actually has at least 1 of each of these.

Wow i think will work, i just want to find a way to kill each type of tower 1 times, thank you very much, you are so helpful
I will test it tonight

fallenangel332 · May 14, 2024

Watch Tower
- Events
  - Unit - A unit Starts the effect of an ability
- Conditions
  - (Ability being cast) Equal to Watch Tower
- Actions
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Unit-type of (Casting unit)) Equal to Guard Tower TRIGSTR_095
    - Then - Actions
      - Unit Group - Add (Casting unit) to GuardTower
      - Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
        
        Loop - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Picked unit)) Equal to Arcane Tower TRIGSTR_096
        
        Then - Actions
        
        Unit Group - Add (Picked unit) to ArcaneTower
        
        Else - Actions
        
        Do nothing
      - Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
        
        Loop - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Picked unit)) Equal to Death Tower TRIGSTR_098
        
        Then - Actions
        
        Unit Group - Add (Picked unit) to DeathTower
        
        Else - Actions
        
        Do nothing
      - Unit - Replace (Random unit from GuardTower) with a Watch Tower using The new unit's max life and mana
      - Unit - Replace (Random unit from ArcaneTower) with a Mazing Rock using The new unit's max life and mana
      - Unit - Replace (Random unit from DeathTower) with a Mazing Rock using The new unit's max life and mana
    - Else - Actions
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Unit-type of (Casting unit)) Equal to Arcane Tower TRIGSTR_096
    - Then - Actions
      - Unit Group - Add (Casting unit) to ArcaneTower
      - Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
        
        Loop - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Picked unit)) Equal to Guard Tower TRIGSTR_095
        
        Then - Actions
        
        Unit Group - Add (Picked unit) to GuardTower
        
        Else - Actions
        
        Do nothing
      - Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
        
        Loop - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Picked unit)) Equal to Death Tower TRIGSTR_098
        
        Then - Actions
        
        Unit Group - Add (Picked unit) to DeathTower
        
        Else - Actions
        
        Do nothing
      - Unit - Replace (Random unit from GuardTower) with a Mazing Rock using The new unit's max life and mana
      - Unit - Replace (Random unit from ArcaneTower) with a Watch Tower using The new unit's max life and mana
      - Unit - Replace (Random unit from DeathTower) with a Mazing Rock using The new unit's max life and mana
    - Else - Actions
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Unit-type of (Casting unit)) Equal to Death Tower TRIGSTR_098
    - Then - Actions
      - Unit Group - Add (Casting unit) to DeathTower
      - Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
        
        Loop - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Picked unit)) Equal to Guard Tower TRIGSTR_095
        
        Then - Actions
        
        Unit Group - Add (Picked unit) to GuardTower
        
        Else - Actions
        
        Do nothing
      - Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
        
        Loop - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Picked unit)) Equal to Arcane Tower TRIGSTR_096
        
        Then - Actions
        
        Unit Group - Add (Picked unit) to ArcaneTower
        
        Else - Actions
        
        Do nothing
      - Unit - Replace (Random unit from GuardTower) with a Mazing Rock using The new unit's max life and mana
      - Unit - Replace (Random unit from ArcaneTower) with a Mazing Rock using The new unit's max life and mana
      - Unit - Replace (Random unit from DeathTower) with a Watch Tower using The new unit's max life and mana
    - Else - Actions

Hi, this is my trigger at the moment, not having any bug so far

Uncle · May 14, 2024

Keep in mind that:
1) That will only work for one Player.
2) You're never removing units from the Unit Groups.
3) You're never checking if those groups actually have the units. (I edited my last post to account for this but I think you missed it)
4) This is extremely inefficient.

fallenangel332 · May 15, 2024

Uncle said:
Keep in mind that:
1) That will only work for one Player.
2) You're never removing units from the Unit Groups.
3) You're never checking if those groups actually have the units. (I edited my last post to account for this but I think you missed it)
4) This is extremely inefficient.

Hi again
There is no way im good enough to make a multiplayer map without a tons of bug so at the moment i need to work on single player map first
BTW, i redo my trigger into 3 different trigger, here is it

Filter
- Events
  - Time - Every 0.00 seconds of game time
- Conditions
- Actions
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Number of units in GuardTower) Less than 1
    - Then - Actions
      - Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
        
        Loop - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Picked unit)) Equal to Guard Tower
        
        Then - Actions
        
        Unit Group - Add (Picked unit) to GuardTower
        
        Else - Actions
        
        Do nothing
    - Else - Actions
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Number of units in ArcaneTower) Less than 1
    - Then - Actions
      - Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
        
        Loop - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Picked unit)) Equal to Arcane Tower
        
        Then - Actions
        
        Unit Group - Add (Picked unit) to ArcaneTower
        
        Else - Actions
        
        Do nothing
    - Else - Actions
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Number of units in DeathTower) Less than 1
    - Then - Actions
      - Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
        
        Loop - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Picked unit)) Equal to Death Tower
        
        Then - Actions
        
        Unit Group - Add (Picked unit) to DeathTower
        
        Else - Actions
        
        Do nothing
    - Else - Actions

Filter 2
- Events
  - Time - Every 0.00 seconds of game time
- Conditions
- Actions
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Number of units in GuardTower) Greater than 1
    - Then - Actions
      - Unit Group - Remove (Random unit from GuardTower) from GuardTower.
    - Else - Actions
      - Do nothing
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Number of units in ArcaneTower) Greater than 1
    - Then - Actions
      - Unit Group - Remove (Random unit from ArcaneTower) from ArcaneTower.
    - Else - Actions
      - Do nothing
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Number of units in DeathTower) Greater than 1
    - Then - Actions
      - Unit Group - Remove (Random unit from DeathTower) from DeathTower.
    - Else - Actions
      - Do nothing

Watch Tower
- Events
  - Unit - A unit Starts the effect of an ability
- Conditions
  - (Ability being cast) Equal to Watch Tower (Neutral Hostile)
  - (Number of units in GuardTower) Equal to 1
  - (Number of units in ArcaneTower) Equal to 1
  - (Number of units in DeathTower) Equal to 1
- Actions
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Unit-type of (Casting unit)) Equal to Guard Tower
    - Then - Actions
      - Unit - Replace (Casting unit) with a Watch Tower using The old unit's relative life and mana
      - Unit - Replace (Random unit from ArcaneTower) with a Mazing Rock using The old unit's relative life and mana
      - Unit - Replace (Random unit from DeathTower) with a Mazing Rock using The old unit's relative life and mana
    - Else - Actions
      - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Casting unit)) Equal to Arcane Tower
        
        Then - Actions
        
        Unit - Replace (Casting unit) with a Watch Tower using The old unit's relative life and mana
        
        Unit - Replace (Random unit from GuardTower) with a Mazing Rock using The old unit's relative life and mana
        
        Unit - Replace (Random unit from DeathTower) with a Mazing Rock using The old unit's relative life and mana
        
        Else - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Casting unit)) Equal to Death Tower
        
        Then - Actions
        
        Unit - Replace (Casting unit) with a Watch Tower using The old unit's relative life and mana
        
        Unit - Replace (Random unit from ArcaneTower) with a Mazing Rock using The old unit's relative life and mana
        
        Unit - Replace (Random unit from GuardTower) with a Mazing Rock using The old unit's relative life and mana
        
        Else - Actions
        
        Do nothing

Uncle · May 15, 2024

So relying on Periodic triggers to keep track of things is one of the big "noob traps". What you want to do instead is track something the EXACT moment it's created or becomes "trackable". For example, with your structures you can keep start tracking them the exact moment that they come into existence:

Events
- Unit - A unit Begins construction
Conditions
Actions
- If (All Conditions are True) then do (Then Actions) else do (Else Actions)
  - If - Conditions
    - (Unit-type of (Triggering unit)) Equal to Guard Tower
  - Then - Actions
    - Set Variable Guard_Tower_Count = (Guard_Tower_Count + 1)
    - Unit Group - Add (Triggering unit) to Guard_Tower_Group
  - Else - Actions
    - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      - If - Conditions
        
        (Unit-type of (Triggering unit)) Equal to Arcane Tower
      - Then - Actions
        
        Set Variable Arcane_Tower_Count = (Arcane_Tower_Count + 1)
        
        Unit Group - Add (Triggering unit) to Arcane_Tower_Group
      - Else - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Triggering unit)) Equal to Death Tower
        
        Then - Actions
        
        Set Variable Death_Tower_Count = (Death_Tower_Count + 1)
        
        Unit Group - Add (Triggering unit) to Death_Tower_Group
        
        Else - Actions

Then when a structure is destroyed you can stop tracking them:

Tower Dies
- Events
  - Unit - A unit Dies
- Conditions
  - ((Triggering unit) is A structure) Equal to True
- Actions
  - -------- Track the dying unit if it's not tracked already --------
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - Dying_Unit Equal to No unit
    - Then - Actions
      - Set Variable Dying_Unit = (Triggering unit)
    - Else - Actions
  - -------- Remove the dying unit from it's group --------
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Unit-type of Dying_Unit) Equal to Guard Tower
    - Then - Actions
      - Set Variable Guard_Tower_Count = (Guard_Tower_Count - 1)
      - Unit Group - Remove Dying_Unit from Guard_Tower_Group
    - Else - Actions
      - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of Dying_Unit) Equal to Arcane Tower
        
        Then - Actions
        
        Set Variable Arcane_Tower_Count = (Arcane_Tower_Count - 1)
        
        Unit Group - Remove Dying_Unit from Arcane_Tower_Group
        
        Else - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of Dying_Unit) Equal to Death Tower
        
        Then - Actions
        
        Set Variable Death_Tower_Count = (Death_Tower_Count - 1)
        
        Unit Group - Remove Dying_Unit from Death_Tower_Group
        
        Else - Actions
  - -------- Reset the variable to allow the trigger to work again --------
  - Set Variable Dying_Unit = No unit

Now when it comes time to cast your ability you have all of the information you need readily available and it's much more efficient:

Watch Tower
- Events
  - Unit - A unit Starts the effect of an ability
- Conditions
  - (Ability being cast) Equal to Watch Tower (Neutral Hostile)
- Actions
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Unit-type of (Casting unit)) Equal to Guard Tower
      - Arcane_Tower_Count Greater than 0
      - Death_Tower_Count Greater than 0
    - Then - Actions
      - -------- Replace the casting tower --------
      - Set Variable Dying_Tower = (Triggering unit)
      - Trigger - Run Tower Dies (ignoring conditions)
      - Unit - Replace Dying_Tower with a Watch Tower using The old unit's relative life and mana
      - -------- Replace the 1st of the other towers --------
      - Set Variable Dying_Tower = (Random unit from Arcane_Tower_Group)
      - Trigger - Run Tower Dies (ignoring conditions)
      - Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana
      - -------- Replace the 2nd of the other towers --------
      - Set Variable Dying_Tower = (Random unit from Death_Tower_Group)
      - Trigger - Run Tower Dies (ignoring conditions)
      - Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana
    - Else - Actions
      - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Casting unit)) Equal to Arcane Tower
        
        Guard_Tower_Count Greater than 0
        
        Death_Tower_Count Greater than 0
        
        Then - Actions
        
        -------- Replace the casting tower --------
        
        Set Variable Dying_Tower = (Triggering unit)
        
        Trigger - Run Tower Dies (ignoring conditions)
        
        Unit - Replace Dying_Tower with a Watch Tower using The old unit's relative life and mana
        
        -------- Replace the 1st of the other towers --------
        
        Set Variable Dying_Tower = (Random unit from Guard_Tower_Group)
        
        Trigger - Run Tower Dies (ignoring conditions)
        
        Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana
        
        -------- Replace the 2nd of the other towers --------
        
        Set Variable Dying_Tower = (Random unit from Death_Tower_Group)
        
        Trigger - Run Tower Dies (ignoring conditions)
        
        Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana
        
        Else - Actions
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Unit-type of (Casting unit)) Equal to Death Tower
        
        Arcane_Tower_Count Greater than 0
        
        Guard_Tower_Count Greater than 0
        
        Then - Actions
        
        -------- Replace the casting tower --------
        
        Set Variable Dying_Tower = (Triggering unit)
        
        Trigger - Run Tower Dies (ignoring conditions)
        
        Unit - Replace Dying_Tower with a Watch Tower using The old unit's relative life and mana
        
        -------- Replace the 1st of the other towers --------
        
        Set Variable Dying_Tower = (Random unit from Arcane_Tower_Group)
        
        Trigger - Run Tower Dies (ignoring conditions)
        
        Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana
        
        -------- Replace the 2nd of the other towers --------
        
        Set Variable Dying_Tower = (Random unit from Guard_Tower_Group)
        
        Trigger - Run Tower Dies (ignoring conditions)
        
        Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana
        
        Else - Actions

Notes:
1) I'm using Integer variables to keep track of the number of units in your Unit Groups. This is because it's more efficient than using the (Number of units in group) function, which has to Loop over the entire group to count all of them. This is an optional optimization.

2) I need that funky Set Dying_Tower + Run Tower Dies stuff because the Replace Unit action doesn't actually Kill units, it REMOVES them. Unfortunately, there's no Event like "A unit Is removed from the game" or this would be an easy fix.

In other words, our Tower Dies trigger doesn't run when a Tower gets replaced which is why I'm manually forcing the trigger to run. You could definitely optimize this setup so that you don't need to do any of that, you just need to find a way to detect when a unit is Removed from the game. Here's one system that offers a custom Event for detecting that: GUI Unit Event.

fallenangel332 · May 16, 2024

Uncle said:
So relying on Periodic triggers to keep track of things is one of the big "noob traps". What you want to do instead is track something the EXACT moment it's created or becomes "trackable". For example, with your structures you can keep start tracking them the exact moment that they come into existence:

Events

Unit - A unit Begins construction

Conditions

Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

(Unit-type of (Triggering unit)) Equal to Guard Tower

Then - Actions

Set Variable Guard_Tower_Count = (Guard_Tower_Count + 1)

Unit Group - Add (Triggering unit) to Guard_Tower_Group

Else - Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

(Unit-type of (Triggering unit)) Equal to Arcane Tower

Then - Actions

Set Variable Arcane_Tower_Count = (Arcane_Tower_Count + 1)

Unit Group - Add (Triggering unit) to Arcane_Tower_Group

Else - Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

(Unit-type of (Triggering unit)) Equal to Death Tower

Then - Actions

Set Variable Death_Tower_Count = (Death_Tower_Count + 1)

Unit Group - Add (Triggering unit) to Death_Tower_Group

Else - Actions

Then when a structure is destroyed you can stop tracking them:

Tower Dies

Events

Unit - A unit Dies

Conditions

((Triggering unit) is A structure) Equal to True

Actions

-------- Track the dying unit if it's not tracked already --------

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

Dying_Unit Equal to No unit

Then - Actions

Set Variable Dying_Unit = (Triggering unit)

Else - Actions

-------- Remove the dying unit from it's group --------

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

(Unit-type of Dying_Unit) Equal to Guard Tower

Then - Actions

Set Variable Guard_Tower_Count = (Guard_Tower_Count - 1)

Unit Group - Remove Dying_Unit from Guard_Tower_Group

Else - Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

(Unit-type of Dying_Unit) Equal to Arcane Tower

Then - Actions

Set Variable Arcane_Tower_Count = (Arcane_Tower_Count - 1)

Unit Group - Remove Dying_Unit from Arcane_Tower_Group

Else - Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

(Unit-type of Dying_Unit) Equal to Death Tower

Then - Actions

Set Variable Death_Tower_Count = (Death_Tower_Count - 1)

Unit Group - Remove Dying_Unit from Death_Tower_Group

Else - Actions

-------- Reset the variable to allow the trigger to work again --------

Set Variable Dying_Unit = No unit

Now when it comes time to cast your ability you have all of the information you need readily available and it's much more efficient:

Watch Tower

Events

Unit - A unit Starts the effect of an ability

Conditions

(Ability being cast) Equal to Watch Tower (Neutral Hostile)

Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

(Unit-type of (Casting unit)) Equal to Guard Tower

Arcane_Tower_Count Greater than 0

Death_Tower_Count Greater than 0

Then - Actions

-------- Replace the casting tower --------

Set Variable Dying_Tower = (Triggering unit)

Trigger - Run Tower Dies (ignoring conditions)

Unit - Replace Dying_Tower with a Watch Tower using The old unit's relative life and mana

-------- Replace the 1st of the other towers --------

Set Variable Dying_Tower = (Random unit from Arcane_Tower_Group)

Trigger - Run Tower Dies (ignoring conditions)

Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana

-------- Replace the 2nd of the other towers --------

Set Variable Dying_Tower = (Random unit from Death_Tower_Group)

Trigger - Run Tower Dies (ignoring conditions)

Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana

Else - Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

(Unit-type of (Casting unit)) Equal to Arcane Tower

Guard_Tower_Count Greater than 0

Death_Tower_Count Greater than 0

Then - Actions

-------- Replace the casting tower --------

Set Variable Dying_Tower = (Triggering unit)

Trigger - Run Tower Dies (ignoring conditions)

Unit - Replace Dying_Tower with a Watch Tower using The old unit's relative life and mana

-------- Replace the 1st of the other towers --------

Set Variable Dying_Tower = (Random unit from Guard_Tower_Group)

Trigger - Run Tower Dies (ignoring conditions)

Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana

-------- Replace the 2nd of the other towers --------

Set Variable Dying_Tower = (Random unit from Death_Tower_Group)

Trigger - Run Tower Dies (ignoring conditions)

Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana

Else - Actions

If (All Conditions are True) then do (Then Actions) else do (Else Actions)

If - Conditions

(Unit-type of (Casting unit)) Equal to Death Tower

Arcane_Tower_Count Greater than 0

Guard_Tower_Count Greater than 0

Then - Actions

-------- Replace the casting tower --------

Set Variable Dying_Tower = (Triggering unit)

Trigger - Run Tower Dies (ignoring conditions)

Unit - Replace Dying_Tower with a Watch Tower using The old unit's relative life and mana

-------- Replace the 1st of the other towers --------

Set Variable Dying_Tower = (Random unit from Arcane_Tower_Group)

Trigger - Run Tower Dies (ignoring conditions)

Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana

-------- Replace the 2nd of the other towers --------

Set Variable Dying_Tower = (Random unit from Guard_Tower_Group)

Trigger - Run Tower Dies (ignoring conditions)

Unit - Replace Dying_Tower with a Mazing Rock using The old unit's relative life and mana

Else - Actions

Notes:
1) I'm using Integer variables to keep track of the number of units in your Unit Groups. This is because it's more efficient than using the (Number of units in group) function, which has to Loop over the entire group to count all of them. This is an optional optimization.

2) I need that funky Set Dying_Tower + Run Tower Dies stuff because the Replace Unit action doesn't actually Kill units, it REMOVES them. Unfortunately, there's no Event like "A unit Is removed from the game" or this would be an easy fix.

In other words, our Tower Dies trigger doesn't run when a Tower gets replaced which is why I'm manually forcing the trigger to run. You could definitely optimize this setup so that you don't need to do any of that, you just need to find a way to detect when a unit is Removed from the game. Here's one system that offers a custom Event for detecting that: GUI Unit Event.

Hi again, here is my current map
i like GEM TD play style so i tried to make it look like it as much as possible

How to check unit type in a group?

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How To Post Your Trigger

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How To Post Your Trigger

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