ZScript question: Change projectile speed dynamically

[willkuer]

I'm working on a V.A.T.S. kinda thing for my Fallout mashup mod. To work with Doom gameplay, V.A.T.S. in this case being simply a TimeFreezer powerup given to and taken from the player inventory by pressing altfire.

I use the User1 button as a hotkey to throw a frag granade from the players inventory - works fine and dandy BUT:
I'd like to have it that when CountInv says I have the TimeFreeze powerup, and I throw a grenade it slows to a crawl and the gravity on the projectile changes (changing gravity not being a problem here), and when I turn off TimeFreeze, it speeds up again to its default speed. So, I could be throwing a nade in realtime, but on it's way I switch on TimeFreeze and it should slow down and vice versa.

I'm a noob in ZScript but I have this set up so far:

Code: Select all

class FRAG : Grenade
{
	Default
	{
	Speed 20;
	Damage 1;
	DeathSound "weapons/exp1";
	BounceType "Hexen";
	BounceFactor 0.5;
	WallBounceFactor 0.3;
	BounceCount 4;
	Scale 0.75;
	Gravity 1.0;
	Decal "Scorch";
	+EXTREMEDEATH;
	+NOTIMEFREEZE;
	-GRENADETRAIL;
	+ALLOWBOUNCEONACTORS;
	+BOUNCEONACTORS;
	}
	
	States
	{
	Spawn:
	SGRN A 1
		{ if (CountInv("PowerTimeFreezerSound", AAPTR_TARGET)>0)
			{
			Gravity = Default.Gravity*0.25;
			Speed = Default.Speed*0.25;
			}
		  else
			{
			Gravity = Default.Gravity;
			Speed = Default.Speed;
			}
		}
	Loop;
	Death:
[...]

But I'm pretty sure "speed" is only taken into account when spawning. So how could I solve this?

Big thanks in advance to anybody bothering with this

EDIT: What I probably mean is "velocity". But I can't wrap my head around vector calculation...

[Apeirogon]

Use speed and gravity variable directly, like

Code: Select all

class bootleg : non_officially_release
{
default
{
speed 10;
gravity 1;
}
states
{
spawn:
tnt1 q 1 { self./*just to make sure that actor change itself speed*/speed *= 0.1/*means speed = speed * 0.1*/; self.gravity *= 7; /*Gravity From Jupiter*/}
}

}

Also, you still can use "decorate" A_ScaleVelocity to change projectile speed, you know!? It works in zscript too.

[Graf Zahl]

You have to alter 'vel' which is the velocity vector. Speed is indeed only used for spawning and in a few special projectiles for later adjustments.

[Apeirogon]

AAAAAAAAA, my knowledge fails me(

[willkuer]

Thanks the two of you! Got it

@Graf Zahl, Danke, habs mir eh gedacht Gibts eigentlich wo fertige Tutorials zu ZScript Basics (für Noobs, allerdings muss ich mir Objektorientierung nicht mehr geben, das kapier ich zum Glück )? Oder soll ich mir lieber gleich C reinziehen?