[1.14.4] Applying Energy Capability to Tools

[Zorochase]

Hello,

I am currently working on a mod similar to TeamCofH's Redstone Arsenal mod (but without being able to empower tools).

I am somewhat new to modding; I've created small, simple mods for personal use in the past, but I wanted to try to branch out with this one.

So far, I have a basic sword that cannot break or be damaged on use. I've taken the implementation of the IEnergyStorage

interface from the sample EnergyStorage class, but every ItemStack of my sword item retains the same amount of energy

and depletes even if it wasn't the specific stack used to damage an entity. (I.E. If one stack starts with 320,000 FE and loses 400 FE

when damaging an entity, every other stack will also lose 400 FE and contain 319,600 FE).  The amount of energy stored in each stack isn't even saved

when I close the game and launch it again. This behavior leads me to a few questions:

 

• How do I tell Forge that I'm trying to make use of the Energy capability?
• How do I properly store the amount of energy for any given ItemStack of the sword/axe/pickaxe etc.. (with NBT?), and access it or modify it with the implemented methods (I.E. extractEnergy, getEnergyStored)
  • (I am aware that in order to display the stored energy in the tooltip, I'd have to @Override the addInformation method. I just need to know how to access the energy stored/max capacity to display it for each ItemStack)
• What else am I missing or not understanding? What should I do to improve my code?

 

I'm sorry if this is a lot to ask, but my modding experience is limited and I've really never dealt with more complicated concepts like this. I tried looking around both

these forums and Google to find answers, but as I expected I could find nothing for Minecraft 1.14.4 in particular, or anything in general dealing

with both tools and the energy capability. I've also looked through Forge's documentation, but either it was too vague to help me figure out what

to do, or I just didn't understand it well enough. I'm not sure where else I should look to start learning more, especially for newer Minecraft versions (1.13+).

I would really appreciate any help.

 

Here's my code:

public class ChromiumSwordItem extends SwordItem implements IEnergyStorage {
    protected int energy;
    protected int capacity;
    protected int maxReceive;
    protected int maxExtract;

    public ChromiumSwordItem() {
        super(
                new ChromiumTier(), 0, 6.0f,
                new Item.Properties()
                .group(ChromiumArsenal.CREATIVE_TAB)
                .maxDamage(0)
                .defaultMaxDamage(0)
                .setNoRepair()
                .rarity(Rarity.UNCOMMON)
        );
        setRegistryName("chromium_sword");

        capacity = 320000;
        maxReceive = 400;
        maxExtract = 320;
      	// energy = Math.max(0 , Math.min(capacity, energy));
      	// Start all Chromium Swords with maximum energy for testing
        energy = capacity;
    }

    @Override
    public int receiveEnergy(int maxReceive, boolean simulate)
    {
        if (!canReceive())
            return 0;

        int energyReceived = Math.min(capacity - energy, Math.min(this.maxReceive, maxReceive));
        if (!simulate)
            energy += energyReceived;
        return energyReceived;
    }

    @Override
    public int extractEnergy(int maxExtract, boolean simulate)
    {
        if (!canExtract())
            return 0;

        int energyExtracted = Math.min(energy, Math.min(this.maxExtract, maxExtract));
        if (!simulate)
            energy -= energyExtracted;
        return energyExtracted;
    }

    @Override
    public int getEnergyStored()
    {
        return energy;
    }

    @Override
    public int getMaxEnergyStored()
    {
        return capacity;
    }

    @Override
    public boolean canExtract()
    {
        return this.maxExtract > 0;
    }

    @Override
    public boolean canReceive()
    {
        return this.maxReceive > 0;
    }
    
  	// TODO: Override addInformation, hitEntity, durability bar stuff
}

 

[Draco18s]

They're all the same because you're storing data in the (singleton) item class.

You need to use capabilities. Override Item#initCapabilities and init a capability for the item stack given to you there.

 

https://mcforge.readthedocs.io/en/1.13.x/datastorage/capabilities/

Edited November 6, 2019 by Draco18s

[Zorochase]

2 hours ago, Draco18s said:

They're all the same because you're storing data in the (singleton) item class.

You need to use capabilities. Override Item#initCapabilities and init a capability for the item stack given to you there.

 

https://mcforge.readthedocs.io/en/1.13.x/datastorage/capabilities/

Thank you for your response.

After reading through the docs (again) I'm still not sure how to actually initialize a capability when overriding initCapabilities.

 

This is what I tried:

    @Nullable
    @Override
    public ICapabilityProvider initCapabilities(ItemStack stack, @Nullable CompoundNBT nbt) {
        return new ICapabilityProvider() {
            @Nonnull
            @Override
            public <T> LazyOptional<T> getCapability(@Nonnull Capability<T> cap, @Nullable Direction side) {
                if (cap == CapabilityEnergy.ENERGY) {
              		// If not new ChromiumSwordItem(), what should I put here? (If that's causing the issue...)
                    return LazyOptional.of(() -> new ChromiumSwordItem()).cast();
                }
                return LazyOptional.empty();
            }
        };
    }

 

This is how I displayed the energy inside the tooltip:

    @Override
    public void addInformation(ItemStack stack, @Nullable World worldIn, List<ITextComponent> tooltip, ITooltipFlag flagIn) {
        super.addInformation(stack, worldIn, tooltip, flagIn);
        stack.getCapability(CapabilityEnergy.ENERGY).ifPresent(e -> tooltip.add(new TranslationTextComponent(String.valueOf(e.getEnergyStored()))));
    }

 

This is how I extracted energy:

    @Override
    public boolean hitEntity(ItemStack stack, LivingEntity target, LivingEntity attacker) {
		// Instead of false, check if the player is in creative
        stack.getCapability(CapabilityEnergy.ENERGY).ifPresent(e -> e.extractEnergy(maxExtract, false));
        return super.hitEntity(stack, target, attacker);
    }

 

I'm not sure if I'm doing all of this wrong or only parts of it are incorrect, but now instead of extracting energy, when I hit an entity, no energy is extracted.

I can't tell if that's because I extracted the energy wrong, I'm displaying it wrong in the tooltip, incorrectly initialized the energy capability, or any mixture

of the three.

Edited November 6, 2019 by Zorochase