"How do I ZScript?"

[Pink Baron]

Hi all!

I'm looking for the usage of map stats from LevelLocals global variable, but I don't figure out how to use them.
For istance, I looked both on Wiki and GZdoom itself (base.txt), and compiled this sample code on a PlayerPawn's tick function. It won't log. Ever. Why?

Code: Select all

Virtual void MyMapStatsManager ()
{
	LevelLocals p;
	
	If (p)
	{
		Int TotalMonsters = p.total_monsters;
		A_LogInt (TotalMonsters);   // Desidered result
	}
	Else {A_Log ("You suck!");}	 // Actual result .-.
}

[AFADoomer]

I think you want to reference 'level' (declared here) instead of declaring 'LevelLocals p'.

What you are doing, instead of using the actual level info, is declaring a new object 'p' that is of struct type LevelLocals. When you check 'if (p)', it's declared and is present, despite every value being uninitialized, so that logic succeeds, but since p.total_monsters has no value, you are most likely logging an empty line.

Just referencing 'level.total_monsters' as a variable should work... Something like this should print the value:

Code: Select all

Virtual void MyMapStatsManager ()
{
      console.printf("%d", level.total_monsters);
}

[Jekyll Grim Payne]

Guys, I don't want to go for the lamest quesitons, but seriously, where do I start from if I don't understand Zscript structure and logic at all, and DECORATE is the only scripting language I've ever mastered while everything else, including C, is completely beyond me? 'Cause at the moment I'm honestly feeling like Doom modding is coming to an end for me.

[Pink Baron]

I think you want to reference 'level' (declared here) instead of declaring 'LevelLocals p'.

What you are doing, instead of using the actual level info, is declaring a new object 'p' that is of struct type LevelLocals. When you check 'if (p)', it's declared and is present, despite every value being uninitialized, so that logic succeeds, but since p.total_monsters has no value, you are most likely logging an empty line.

Just referencing 'level.total_monsters' as a variable should work... Something like this should print the value:

Code: Select all

Virtual void MyMapStatsManager ()
{
      console.printf("%d", level.total_monsters);
}

It worked, thanks!

P.S. Thus, I simply had to access "levels" direcly without resorting to "let", aliases, auto or anything else shown either on Wiki or Gzdoom internal files (I even tried with "levels p", but it gave me obiously an error). Seriously, it's like finding the secret door in Milon's Secret Castle...how was I supposed to know that?!?!
Mini rant aside, thank you for the info: whenever I use that code for a mod, I'll comment it so that other users won't get stuck as much as I did.

@ Jekyll Grim Payne: As I'm currently in process to convert my mod to ZScript, I'm pretty much on the same boat. It's really, really hard to understand, but not impossible and gives several dividends. Start by studying other ZScript based mods, such as D4D, and/or converting your DECORATE files as/is for an headstart. Then, read some C+ programming tutorials as it's very similar to ZScript. After that, if you still get halted, ask here for some answers.

[Nash]

Seriously, it's like finding the secret door in Milon's Secret Castle...how was I supposed to know that?!?!

It's listed under the global variables section of the wiki. https://zdoom.org/wiki/ZScript_global_variables

[Ghost Prototype]

Is there a way to change where the pickupmessage is shown on the hud and what kind of font it uses?

[Jimmy]

Changing to a specific map with ZScript.

How do?

[Graf Zahl]

Teleport_NewMap - just like ACS.

[Accensus]

Code: Select all

let PowerItem = Powerup(CPlayer.mo.FindInventory("PowerQuadDamage"));
PowerupTime = PowerItem.EffectTics;
MaxPowerupTime = ???; //What to put here?

DrawBar("PWRBRON", "PWRBROFF", PowerupTime, 1000, (-94, 28), 0, 0, TOP_RIGHT_MODULE); //Ignore flag, it's custom.

So I have this ZScript HUD code, and my question is this: how to determine what the maximum time for the powerup is upon picking it up? I'm looking for a way to mimic poweruptime from SBARINFO, but so far I've only worked out half of the puzzle.

[Blue Shadow]

There is a PlayerPawn method which is called GetEffectTicsForItem. It returns the current and max (default) effect tics.

[Matt]

Teleport_NewMap - just like ACS.

So just level numbers only then, no names? (and no way to get, say, level.nextmap?)

EDIT: Next map, of course, could just use Exit_Normal.

Which combined with levellocals manipulation means this can be used to replay a map:

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level.nextmap=level.mapname;
Exit_Normal(0);

[Accensus]

There is a PlayerPawn method which is called GetEffectTicsForItem. It returns the current and max (default) effect tics.

Works perfectly. Thank you, Blue Shadow.

[Rip and Tear]

What is the correct way to return and jump from an anonymous function in ZScript?

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TNT1 A 0 {
  if(foo) {
    return ResolveState("Spawn");
  }
}

Script error, Return type mismatch

[Gutawer]

You're doing it correctly, problem is, you need to return something outside of the if block in case foo is false - if you want no jump, you should use return ResolveState(null);. Otherwise it returns void which is not a State - by putting return ResolveState(<whatever>); anywhere in an anonymous function, it treats it as if it returns a State.

[Major Cooke]

1. How do I set up an inventory item that does not inherit from Weapon or Ammo (or a key) so that it would be given with ID(K)FA?


2. Is there a way to override or somehow get around an Ammo item's get-parent function so that you can have something like:

MyAmmo0:Ammo
MyAmmo1:MyAmmo0
MyAmmo2:MyAmmo0

in which MyAmmo1 and MyAmmo2 are distinct items?

1. You will need to override the player's give cheat virtual.

2. I don't follow... Can you elaborate?

Also, there's currently no way to rotate sprites on the screen when dealing with hud elements. Gotta wait for Graf on that one.