"How do I ZScript?"

[Major Cooke]

Okay, dynamic arrays are on the wiki now.

[hideousdestructor]

Does ShrinkToFit delete entries that are zero, or do they have to be totally empty?

What would be the best way to preserve a dynamic array between maps?

[Graf Zahl]

ShrinkToFit reallocates the memory buffer to hold the exact amount of entries used. To avoid fequent reallocation the array class reallocates in larger chunks, this is for freeing that unused space once you know the array won't grow any further.

[ZZYZX]

When you want to declare an array field, do you write "type[arraylen] field" or "type field[arraylen]"? Or both are ok? Because usually it's written like the latter, but Gutawer wrote this:

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string[2] stringArray;

And it broke in GZDB, while didn't break in GZDoom.

[Graf Zahl]

Both are valid syntax. This also works:

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String[2] messages[5];

[krokots]

How to change the damage of projectiles from a variable that is stored inside a monster?

Let me explain. For instance, i got two imps. Both have "user_damage" int (3) and in A_CustomComboAttack the damage is calculated: random(1,8)*user_damage. But it will only work for melee. I want this variable to apply to projectiles that this imps fire. How to do this?

[Graf Zahl]

In DECORATE it's not possible, but in ZScript you can define a damage function that accesses the variables of the projectile's shooter.

[Gutawer]

So dynamic arrays are in now, is it possible to pass one to a function? I still get the "Invalid type Type for function parameter" error when using one as a function argument.

[Major Cooke]

No, not yet. But you can pass in a pointer to the function, have it get the actor cast and, if the array's local (not inside the states) you can perform Copy from within the function.

[krokots]

In DECORATE it's not possible, but in ZScript you can define a damage function that accesses the variables of the projectile's shooter.

Something like this:
Imp:

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class DoomImp : Actor
{
int user_damage
...

Imp Ball:

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...
DamageFunction (random(1,8)*target.user_damage);
...

gives error (Unknown identifier)
It must be a property or something?

[Major Cooke]

That's not what he meant.

Assuming you have a unique class and not trying to inject it on DoomImp... He meant, you can make your own type of damage function, not the property.

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void MyBallExplode()
{
    int dmg = damage;
    let dimp = MyDoomImp(target);
    if (dimp) dmg = dimp.user_damage;
    if (tracer) tracer.DamageMobj(self, target, dmg);
}

Give the projectile +HITTRACER flag, then upon entering the death state, have it do this:

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TNT1 A 0 MyBallExplode();

[ZZYZX]

Both are valid syntax. This also works:

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String[2] messages[5];

What does it do? Is it a string messages[5][2] or 5 overrides the 2?
Also can there be multiple indices as in multiple dimensions?

[Nash]

Help, if I know the TID of the thing, can I do anything useful to the thing with the TID? And yes this is a ZScript question. I want to make a thing that - when you shoot at it - it finds out the Vector3 position of something with a specific TID.

[Graf Zahl]

No, not yet. But you can pass in a pointer to the function, have it get the actor cast and, if the array's local (not inside the states) you can perform Copy from within the function.

For now, if you absolutely have to, wrap the array into a struct and pass that around. Struct references can be passed to functions, even if they contain data that otherwise can not.

[Graf Zahl]

Both are valid syntax. This also works:

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String[2] messages[5];

What does it do? Is it a string messages[5][2] or 5 overrides the 2?
Also can there be multiple indices as in multiple dimensions?

That's the same as String[2][5] messages or String messages[2][5];