Making a powerup that draws power & how to change inv icon

[ramon.dexter]

Hello everybody, how are you doin?

I have two questions regarding some advanced topics of zscript:
1) How do I make a item (lets say, an flashlight), that draws power (for ease some kind of ther inv item, like batteries). How do I make it? I poked around the DoEffect() in gzdoom.pk3, but since my coding knowledge is belowe this level of coding, its barely understandable for me. So, how do I make an item, that draws (simple TakeInventory() ) power every one second (35 tics)?
I made an item with decorate and ACS, but I would like to get rid of the ACS part and let zscript do the job.

2) Is it possible to change the inventory icon of item? If so, how?

Many thanks

[Apeirogon]

For inventory item, as example

Code: Select all

class test_item : inventory
{
int tick_amount; //store integer variable with name tick_amount in this actor

overide void attachtoowner(actor user)//call every time item become part of actor inventory
{
tick_amount = 0;//define value of tick_amount, because compiler use value which left in memory in place where it left place for this integer value
super.attachtoowner(user);//call super function
}


override void doeffect()
{
if(owner.countinv("cell") == 0) {return;}//break funtion if owner of this item dont have cell in inventory

tick_amount++;//AKA tick_amount + 1

if(tick_amount == 35)
{
owner.takeinventory("cell", 1);
tick_amount = 0;}

owner.a_spawnprojectile("plasmaball");
}
}

This item spawn in direction where player look, in crosshair, one plasma ball every tick, and every second pick from player inventory one cell. Next yourself.

Basicaly, all you need to do its place word "owner" before any action with holder of this item. This tell engine do something using actor as centher of the universe for this functions, like spawn/check inventory/proximity/health/etc. not item. Because simple a_defaulfunction(first, second, third variable) force engine do something with inventory item itself, which not always makes sense, like check health of inventory item.

[ramon.dexter]

Thank you Apeirogon, that's the example I wanted!

[Blue Shadow]

2) Is it possible to change the inventory icon of item? If so, how?

Assuming the calling object is the item itself:

Code: Select all

Icon = TexMan.CheckForTexture(<newicon>, TexMan.Type_MiscPatch);

[ramon.dexter]

Assuming the calling object is the item itself:

Well, the mechanic is following: Playere uses the item, the item starts the script (so I assume the item IS the activator, but I'm not fully sure).