I have implemented a custom recipe class that adds NBT data to the crafting output's ItemStack. It's just an integer that I want to use to increase the player's attack damage when using the tool. In my custom tool class, I have overridden Forge's ItemStack-sensitive version of getAttributeModifiers to look at the ItemStack's NBT data. I've also created a custom tool tip for the item, and I can see in my custom tool tip that the NBT data is there. But the player's attack damage is not changing when holding the item. What am I missing?

 

Code for the custom tool:

Spoiler

public class PrimalToolAxe extends ItemTool
{
	protected String registryName;
	private static final Set<Block> EFFECTIVE_ON = Sets.newHashSet(new Block[] { Blocks.PLANKS, Blocks.BOOKSHELF, Blocks.LOG, Blocks.LOG2, Blocks.CHEST, Blocks.PUMPKIN, Blocks.LIT_PUMPKIN,
			Blocks.MELON_BLOCK, Blocks.LADDER, Blocks.WOODEN_BUTTON, Blocks.WOODEN_PRESSURE_PLATE });

	public PrimalToolAxe(String registryName, ToolMaterial material)
	{
		super(material, EFFECTIVE_ON);
		this.registryName = registryName;
		this.setRegistryName(registryName);
		this.setUnlocalizedName(getRegistryName().toString());
		this.setCreativeTab(PrimalCreativeTabs.tabPrimalcraft);
		this.damageVsEntity = 1.0F + material.getDamageVsEntity();
	}

	@Override
	@SideOnly(Side.CLIENT)
	public void addInformation(ItemStack stack, EntityPlayer player, List tooltip, boolean isAdvanced)
	{
		String s = "Damage: +" + getActualDamage(stack);
		tooltip.add(s);
	}

	@Override
	public Multimap<String, AttributeModifier> getAttributeModifiers(EntityEquipmentSlot equipmentSlot, ItemStack stack)
	{
		Multimap<String, AttributeModifier> multimap = super.getItemAttributeModifiers(equipmentSlot);

		if (equipmentSlot == EntityEquipmentSlot.MAINHAND)
		{
			multimap.put(SharedMonsterAttributes.ATTACK_DAMAGE.getName(), new AttributeModifier(ATTACK_DAMAGE_MODIFIER, "Weapon modifier", (double) getActualDamage(stack), 0));
			multimap.put(SharedMonsterAttributes.ATTACK_SPEED.getName(), new AttributeModifier(ATTACK_SPEED_MODIFIER, "Weapon modifier", -2.4000000953674316D, 0));
		}

		return multimap;
	}

	private int getActualDamage(ItemStack stack)
	{
		int damage = (int) this.damageVsEntity;

		if (stack.hasTagCompound() && stack.getTagCompound().hasKey("damageIncrease"))
		{
			damage += stack.getTagCompound().getInteger("damageIncrease");
		}

		return damage;
	}

}

 

 

Edited September 27, 20178 yr by Daeruin
Marking solved

I must have read in a dozen different places that you should override Item#getAttributeModifiers (particularly Forge's ItemStack-sensitive version of it) in order to set a custom attack modifier on a tool, similar to how ItemSword does it. Yet it isn't working for me. getAttributeModifers gets called when displaying the tool tip, but not when it comes to actually applying damage.

 

I finally found this nice method from Choonster that does work, however it results in this big nasty tool tip (see attachment) that I think comes from ItemStack#getToolTip. My item is a weapon that has to be held in your main hand to attack with, so this tool tip doesn't make sense. I was hoping someone would have a quick answer for how I control this tool tip.

On 23/09/2017 at 4:40 PM, Daeruin said:

I have implemented a custom recipe class that adds NBT data to the crafting output's ItemStack. It's just an integer that I want to use to increase the player's attack damage when using the tool. In my custom tool class, I have overridden Forge's ItemStack-sensitive version of getAttributeModifiers to look at the ItemStack's NBT data. I've also created a custom tool tip for the item, and I can see in my custom tool tip that the NBT data is there. But the player's attack damage is not changing when holding the item. What am I missing?

 

 

If you set a breakpoint in the method, is it called when you equip/unequip the tool?

 

By calling super.getItemAttributeModifiers, you're creating a Multimap that already has AttributeModifiers with the ATTACK_DAMAGE_MODIFIER/ATTACK_SPEED_MODIFIER UUIDs. You then add your own AttributeModifiers with these UUIDs, which could be the cause of your issue.

 

Try creating an empty Multimap instead.

 

 

5 hours ago, Daeruin said:

I finally found this nice method from Choonster that does work, however it results in this big nasty tool tip (see attachment) that I think comes from ItemStack#getToolTip. My item is a weapon that has to be held in your main hand to attack with, so this tool tip doesn't make sense. I was hoping someone would have a quick answer for how I control this tool tip.

 

That code is from 1.8, before dual-wielding was added along with slot-specific AttributeModifiers and the attack speed attribute. You can see the 1.12.2 version of that code here.

Edited September 26, 20178 yr by Choonster

15 hours ago, Choonster said:

By calling super.getItemAttributeModifiers, you're creating a Multimap that already has AttributeModifiers with the ATTACK_DAMAGE_MODIFIER/ATTACK_SPEED_MODIFIER UUIDs. You then add your own AttributeModifiers with these UUIDs, which could be the cause of your issue.

 

Try creating an empty Multimap instead.

 

That was it. I really appreciate your help, especially since nobody else seemed inclined to reply.

 

Updated getAttributeModifiers method:

Spoiler

@Override
public Multimap<String, AttributeModifier> getAttributeModifiers(EntityEquipmentSlot equipmentSlot, ItemStack stack)
{
	Multimap<String, AttributeModifier> multimap = HashMultimap.<String, AttributeModifier>create();

	if (equipmentSlot == EntityEquipmentSlot.MAINHAND)
	{
		multimap.put(SharedMonsterAttributes.ATTACK_DAMAGE.getName(), new AttributeModifier(ATTACK_DAMAGE_MODIFIER, "Weapon modifier", (double) getActualDamage(stack), 0));
		multimap.put(SharedMonsterAttributes.ATTACK_SPEED.getName(), new AttributeModifier(ATTACK_SPEED_MODIFIER, "Weapon modifier", -2.4000000953674316D, 0));
	}

	return multimap;
}