"How do I ZScript?"

[Graf Zahl]

You can assign a string which gets converted according to the general color naming logic, any integer number and through color() either RGB or ARGB.
You can also access the single color channels with .a, .r, .g and .b.

[Major Cooke]

Aha. Found this in strife statusbar, and was ninja-chucked.

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		Color green1 = Color(255, 180, 228, 128);	// light green
		Color green2 = Color(255, 128, 180, 80);	// dark green

		Color blue1 = Color(255, 196, 204, 252);	// light blue
		Color blue2 = Color(255, 148, 152, 200);	// dark blue

		Color gold1 = Color(255, 224, 188, 0);	// light gold
		Color gold2 = Color(255, 208, 128, 0);	// dark gold

		Color red1 = Color(255, 216, 44,  44);	// light red
		Color red2 = Color(255, 172, 28,  28);	// dark red

Oh, so we can do this as well?

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 Color test = Color(128, 256, 92);

and that translates to using just RGB?

[Graf Zahl]

Yes. But keep in mind that some code needs a non-0 alpha to work, but the 3 value constructor must set alpha to 0 for historic reasons.

[Death Egg]

I'm trying to convert the code here to ZScript but I'm stuck on this bit:

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else xsp -= minimum(absolute(xsp), frc)*sign(xsp);

Here's my current converted version:

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else vx -= min(abs(vx), PLAYER_MOVE_SPEED)*sgn(vx);

What would the equivalent for sign be in ZScript? And did I convert minimum and absolute correctly? Only 'sgn' gives me an error so far.

[Graf Zahl]

In this case the best thing is to use clamp:

vx -= clamp(vx, -PLAYER_MOVE_SPEED, PLAYER_MOVE_SPEED);

[ZZYZX]

Sign is usually something like this: (v>=0?1:-1)
Sometimes 0 also returns 0. Not sure what's intended in this particular case.

And yes, clamp works best.

[Beed28]

I am trying to use an EventHandler to spawn an actor when a map is loaded. Like here, for example:

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class MyHandler : EventHandler
{
	override void WorldLoaded(WorldEvent e)
	{
		Spawn("ActorIwantToSpawn", pos, NO_REPLACE);
	}
}

I just cannot get it to work, at all. Every time I try to, GZDoom crashes with "Call to unknown function 'Spawn'". There's literally nothing on the wiki and there's literally no examples floating about that I could find.

[Ed the Bat]

viewtopic.php?f=3&t=55073&p=973738#p973738

[Beed28]

Got it to work. Here's what I used:

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Actor.Spawn("ActorIWantToSpawn", (0,0,0), NO_REPLACE);

Cheers.

[Matt]

How do you change an actor's decal?

EDIT: Better off using [wiki]A_SprayDecal[/wiki] instead...

[DenisBelmondo]

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class GibsHandler : EventHandler
{
	override void WorldThingDamaged(WorldEvent e) // WorldThingDamaged works but not WorldThingDied
	{
		if ( e.thing.bIsMonster && !e.thing.bNoBlood && e.thing.InStateSequence(e.thing.CurState, e.thing.ResolveState("XDeath")) ) {
			e.thing.A_SpawnItemEx("GibsHack");
		}
	}
}

With this code, actors like demons and cacodemons spawn the "GibsHack" actor which, as you probably could imagine, looks really bizarre.

I figured I should probably post this here for the benefit of myself and others. There is an extra parameter for e.thing.FindState which I used in place of e.thingResolveState in this context that makes the function search for the state label explicitly rather than approximating it when it can't be found. Here's lines 235 - 250 (at the time of writing) in p_states.cpp of the *zdoom source code:

---

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//===========================================================================
//
// FindState (multiple names version)
//
// Finds a state that matches as many of the supplied names as possible.
// A state with more names than those provided does not match.
// A state with fewer names can match if there are no states with the exact
// same number of names.
//
// The search proceeds like this. For the current class, keeping matching
// names until there are no more. If both the argument list and the state
// are out of names, it's an exact match, so return it. If the state still
// has names, ignore it. If the argument list still has names, remember it.
//
//===========================================================================
FState *PClassActor::FindState(int numnames, FName *names, bool exact) const

With this knowledge, my code now looks like:

---

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class GibsHandler : EventHandler
{
	override void WorldThingDamaged(WorldEvent e) // WorldThingDamaged works but not WorldThingDied
	{
		if
		(
			e.thing.bIsMonster &&
			!e.thing.bNoBlood && (
				e.thing.InStateSequence( e.thing.CurState, e.thing.FindState("XDeath", TRUE) )
			)
		) {
			e.thing.A_SpawnItemEx("GibsHack");
		}
	}
}

and everything works as intended. Non-XDeath'ing actors don't spawn the GibsHack actor.

[zrrion the insect]

Is there a way to change what happens when the player presses the move/jump/crouch keys instead of disabling everything and reimplementing it a different way?

[JPL]

I'm new to ZScript and would like something similar to what I asked the pre-ZScript world last July, trying to figure stuff out on the wiki/docs. To be more specific than I was in that post, here's what I'm after:

- Actor that runs an ACS script when player gets within a radius of it.
- Radius and two string properties are defined per-instance.
- Actor passes the two string properties on to ACS.
- Assume UDMF and zero compat requirements, ie this is a new level-centric mod.
- Doesn't have to work at all in multiplayer.

The (really neat) DECORATE thing that ZZYZX wrote for me in that post from last year used the trick of giving a CustomInventory, but it seems like those sorts of hacks are a thing of the past now. I'm happy to learn and R&D this myself, so if nothing else I'm looking for advice on general approaches.

[Nash]

JPL - can you summarize what exactly was it you were trying to achieve? It looks like a lot of those steps were just workaround-cruft that are unnecessary now and can be skipped, but I'd need a better idea first of what you actually want to make. Based on the limited understanding I have of it now (you just want something to activate when in proximity) I do know for a fact that it's quite simple to do with ZScript... just need more info.

[Matt]

> Radius and two string properties are defined per-instance.

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override void PostBeginPlay(){
 super.PostBeginPlay();
 A_SetSize(...)
 blahblahblah="Blah blah blah!";
}

> Actor that runs an ACS script when player gets within a radius of it.
Can you elaborate on this? Should it just play once, or every tic that the player is within, and are we talking about the actor's own hitbox radius or with an arbitrary (and perhaps circular) area?

> Actor passes the two string properties on to ACS.
I suspect the following would be applicable:

is it possible to access an actor-defined variable in ACS somehow?

No. The main problem being that ACS has no concept of actors. If you need interaction you should do the bulk of the work in ZScript and then use ScriptCall for interfacing.

(but yes what Nash said. It may be much simpler to re-think the desired end result and rewrite the whole thing.)

Is there a way to change what happens when the player presses the move/jump/crouch keys instead of disabling everything and reimplementing it a different way?

What kind of change are you trying for? I can't think of any meaningful qualitative change that would not have to be "reimplemented".