Making a Trap

[Spelos]

From what it looks like I think something like this should work: (With Mudbill's if tip and some corrections)

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void OnStart()
{
    AddEntityCollideCallback("Player", "spike_trap", "SpikeTrapAltar", false, 0);
}

void SpikeTrapAltar(string &in asParent, string &in asChild, int alState)
{ 
    PlaySoundAtEntity("swomp", "L01_pierce01", "spike_trap", 0.0, false);
    PlaySoundAtEntity("swomp2", "L01_pierce02", "spike_trap", 0.0, false);

    for (int x = 0; x <= 11; x += 1)
    {
        RotatePropToSpeed("roof_wheel_"+x, 1, 3, 0, 0, -1, false, "");
    }
    for (int i = 0; i <= 6; i += 1)
    {
        SetMoveObjectStateExt("roof_pole_"+i, -0.4f, 2.0f, 5.0f, 1.0f, true);
    }
    
    if (alState == 1)
        AddTimer("dead", 0.7f, "YourDeadBoy");
    else
        AddTimer("pierce1", 0.3f, "TimerStopPierce"); 
}

void YourDeadBoy ( string &in asTimer )
{
    PlaySoundAtEntity("", "stab_impact.snt", "Player", 1.0f, false);
    PlaySoundAtEntity("", "spiketrap_death", "Player", 1.0f, false);
    SetPlayerHealth(0);
}
void TimerStopPierce ( string &in asTimer )
{
    RemoveTimer("dead");
} 


alStates don't refresh once their called, but if the callback's bool abDeleteOnCollide is set to false, it will fire again when alState condition is fulfilled again.

Take a note of the last two parameters in these examples.
This will trigger every time Player Enters or Leaves the area.

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AddEntityCollideCallback("Player", "spike_trap", "SpikeTrapAltar", false, 0); 


This will trigger Only once when Player Enters or Leaves the area for the first time.

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AddEntityCollideCallback("Player", "spike_trap", "SpikeTrapAltar", true, 0); 


More examples:

Spoiler below!

This will trigger every time Player Enters the area.

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AddEntityCollideCallback("Player", "spike_trap", "SpikeTrapAltar", false, 1); 


This will trigger every time Player Leaves the area.

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AddEntityCollideCallback("Player", "spike_trap", "SpikeTrapAltar", false, -1); 


This will trigger Only once Player Enters the area.

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AddEntityCollideCallback("Player", "spike_trap", "SpikeTrapAltar", true, 1); 


This will trigger Only once Player Leaves the area.

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AddEntityCollideCallback("Player", "spike_trap", "SpikeTrapAltar", true, -1); 


Useful note:

I can't remember if using 0 and "true" can trigger exiting if the player starts the map within the area. It might not count spawning as entering, and thus trigger exit first.

Also you Check for alState 0, which never happens.

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(alState == 0)
{
 //Never happens
 //alState is 1 or -1 inside the function you called
} 


Because once the Callback is decided it can't be 0 (both) at once, it will be either -1 (leave) or 1 (enter).