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[1.10.2] Item attribute


gabrielbl
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Manage to find a way out but isn't perfect since if i get the item from creative menu it wont came with the Attribute Modifier.

 

ItemStack swordStack = new ItemStack(TutorialItems.super_cheaty_sword);
swordStack.setStackDisplayName("Not a cheaty sword");
final UUID ATTACK_DAMAGE_MODIFIER = UUID.fromString("CB3F55D3-645C-4F38-A497-9C13A33DB5CF");
final UUID ATTACK_SPEED_MODIFIER = UUID.fromString("FA233E1C-4180-4865-B01B-BCCE9785ACA3");
swordStack.addAttributeModifier(SharedMonsterAttributes.ATTACK_DAMAGE.getAttributeUnlocalizedName(),
        new AttributeModifier(ATTACK_DAMAGE_MODIFIER, "Weapon modifier", (double)40, 0),
        EntityEquipmentSlot.MAINHAND);
swordStack.addAttributeModifier(SharedMonsterAttributes.ATTACK_SPEED.getAttributeUnlocalizedName(),
        new AttributeModifier(ATTACK_SPEED_MODIFIER, "Weapon modifier", (double)10, 0),
        EntityEquipmentSlot.MAINHAND);
String[] cheatySwordCraft = {"CCC", "CDC", "CCC"};
GameRegistry.addShapedRecipe(swordStack, cheatySwordCraft[0],
        cheatySwordCraft[1], cheatySwordCraft[2], 'C', TutorialItems.custom_item, 'D', Items.DIAMOND_SWORD);

 

Can someone help me with the creative tab issue?

 

Source:

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Override

Item#getAttributeModifiers

to do the following:

  • Call the super method.
  • Check that the
    EntityEquipmentSlot

    argument is

    EntityEquipmentSlot.MAINHAND

    .

  • If it is, replace the modifiers with the IDs
    Item.ATTACK_DAMAGE_MODIFIER

    and

    Item.ATTACK_SPEED_MODIFIER

    (use the existing fields rather than calling

    UUID.fromString

    ) in the

    Multimap

    with your own modifiers.

  • Return the
    Multimap

    .

 

I have an example of this here.

Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.

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Thank you, it worked here but i had to reimplemented like this since i was recieving errors from the java lambda expression not being supported.

 

private void replaceModifier(Multimap<String, AttributeModifier> modifierMultimap,
                             IAttribute attribute, UUID id, double multiplier) {
    // Get the modifiers for the specified attribute
    final Collection<AttributeModifier> modifiers = modifierMultimap.get(attribute.getAttributeUnlocalizedName());
    AttributeModifier selectedModifier = null;
    for (AttributeModifier modifier: modifiers) {
        if (modifier.getID().equals(id)) {
            selectedModifier = modifier;
            break;
        }
    }
    if (selectedModifier != null) {
        modifiers.remove(selectedModifier);
        modifiers.add(new AttributeModifier(selectedModifier.getID(), selectedModifier.getName(),
                selectedModifier.getAmount() * multiplier, selectedModifier.getOperation()));
    }
}

Previous error: “lambda expressions not supported at this language level”

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Just a quick question about other AttributeModifier. I'm able to add Knockack resistance to an armor like this:

@Override
public Multimap<String, AttributeModifier> getAttributeModifiers(EntityEquipmentSlot slot, ItemStack stack) {
    final Multimap<String, AttributeModifier> modifiers = super.getAttributeModifiers(slot, stack);
    if (slot == EQUIPMENT_SLOT) {
        modifiers.put(SharedMonsterAttributes.KNOCKBACK_RESISTANCE.getAttributeUnlocalizedName(),
                new AttributeModifier(SharedMonsterAttributes.KNOCKBACK_RESISTANCE.getAttributeUnlocalizedName(), (double)20, 0));
    }
    return modifiers;
}

Is this the best way to do it? I couldn't find the UUID either know what modifiers are those at ItemArmor

private static final UUID[] ARMOR_MODIFIERS = new UUID[] {UUID.fromString("845DB27C-C624-495F-8C9F-6020A9A58B6B"), UUID.fromString("D8499B04-0E66-4726-AB29-64469D734E0D"), UUID.fromString("9F3D476D-C118-4544-8365-64846904B48E"), UUID.fromString("2AD3F246-FEE1-4E67-B886-69FD380BB150")};

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You should use the existing

ItemArmor#armorType

field to get the

EntityEquipmentSlot

of an

ItemArmor

instance rather than creating your own field.

 

The

ItemArmor.ARMOR_MODIFIERS

array contains the

UUID

s used for the

SharedMonsterAttributes.ARMOR

and

SharedMonsterAttributes.ARMOR_TOUGHNESS

modifiers provided by each piece of armour (see

ItemArmor#getItemAttributeModifiers

). It uses the return of

EntityEquipmentSlot#getIndex

as the index.

 

You should create your own UUID for your modifier. Call

UUID.randomUUID

once at startup to generate a random UUID, then write it to the log. Create a

private static final

field of type

UUID

in your armour class and initialise it by calling

UUID.fromString

with the UUID that was printed to the log. Use this field as the ID of your modifier.

 

Side note: You don't need to cast from

int

to

double

, Java will automatically convert numeric types to "wider" types. You only see these casts in vanilla code because the compiler automatically generates them.

Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.

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