[1.8][SOLVED] Custom Attribute/Attribute Modifier Help

NovaViper · February 23, 2015

Hey, I'm trying to make a new attribute that makes an entity that has it more resistant to explosions from creepers and TNT. This is my first time attempting this and I have no idea where to start off with it. I already created the attribute itself but I don't know how to create the events to activate it/utilize it. My code is on Github and here is attribute:

    public static final IAttribute blastResist = (new RangedAttribute((IAttribute)null, "generic.blastResist", 30.0D, 0.0D, Double.MAX_VALUE)).setDescription("Explosion Resistance").setShouldWatch(true);

Ernio · February 23, 2015

Anything realted to dealing damage requires you to subscribe to LivingHurtEvent. There you will need to check DamageSource and if it's an explosion, do check for value of this attribute (example on how to get attribute are in vanilla) and compare values (do math) and then apply new damage (cancel old one).

Registering attribute should be done in EntityConstructing (instanceof EntityLivingBase). I mean - I THINK so.

To register it you use something like entity.registerBaseAttribute (I don't remember exact name)

NovaViper · February 23, 2015

Ok, here's what I started to do but I'm not sure how get the damage the entity has taken

	@SubscribeEvent
public void blastResist(LivingHurtEvent event){
	if(event.entity instanceof EntityMetalZertum){
		if(event.source.isExplosion()){

		}
	}

}

Failender · February 23, 2015

check out event.ammount

NovaViper · February 23, 2015

How do I get the explosion damage type? I'm not exactly sure if I'm doing this correctly, here is what I have

	@SubscribeEvent
public void blastResist(LivingHurtEvent event){
	if(event.entity instanceof EntityMetalZertum){

		EntityMetalZertum entity;

		if(event.source.isExplosion()){
			event.ammount = event.source / entity.blastResist;
		}
	}

}

Failender · February 24, 2015

I'm not sure what you are asking for you? You already got the solution. If you aren't just test it.

NovaViper · February 24, 2015

What I mean is isn't there suppose to be some kind of interger or double I'm suppose to get? Because right now, it says error about the souce nor convertable to double on Eclipse

Failender · February 24, 2015

You got to check if the damage type is an explosion. Which is done. After you found that out you might want to access the value of the damage taken, which is event.ammount. This variable is the ammount of damage the player would take.

NovaViper · February 24, 2015

I can't use the same thing again, it'll glitch it up. What I'm trying to do is take the damage and divide it.

Like this

	@SubscribeEvent
public void blastResist(LivingHurtEvent event){
	if(event.entity instanceof EntityMetalZertum){

		EntityMetalZertum entity;

		if(event.source.isExplosion()){
			event.ammount = event.ammount / entity.getEntityAttribute(entity.blastResist).getAttributeValue();
		}
	}

}

Also the ammount is a float, not a double

Failender · February 24, 2015

1. You need to initialize the entity (In this case EntityMetalZertum) before using it or youll get a nullpointerexception

2. You can cast a float to a double if needed

NovaViper · February 24, 2015

I'm getting a crash saying

[19:40:59] [Client thread/ERROR] [FML]: Caught exception from zero_quest

java.lang.IllegalArgumentException: Method public void common.zeroquest.events.LivingEvents.blastResist(net.minecraftforge.event.entity.living.LivingHurtEvent,common.zeroquest.entity.EntityMetalZertum) has @SubscribeEvent annotation, but requires 2 arguments. Event handler methods must require a single argument.

at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:72) ~[forgeSrc-1.8-11.14.1.1325.jar:?]

at common.zeroquest.ZeroQuest.load(ZeroQuest.java:98) ~[bin/:?]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_25]

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_25]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_25]

at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_25]

at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:518) ~[forgeSrc-1.8-11.14.1.1325.jar:?]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_25]

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_25]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_25]

at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_25]

at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?]

at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?]

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?]

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?]

at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?]

at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:208) ~[forgeSrc-1.8-11.14.1.1325.jar:?]

at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:187) ~[forgeSrc-1.8-11.14.1.1325.jar:?]