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

[NovaViper]

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]

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]

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]

check out event.ammount

[NovaViper]

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]

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

[NovaViper]

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]

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]

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]

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]

I'm getting a crash saying

 

 

  Reveal hidden contents

[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:?]

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.distributeStateMessage(LoadController.java:118) [LoadController.class:?]

at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:692) [Loader.class:?]

at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:291) [FMLClientHandler.class:?]

at net.minecraft.client.Minecraft.startGame(Minecraft.java:521) [Minecraft.class:?]

at net.minecraft.client.Minecraft.run(Minecraft.java:356) [Minecraft.class:?]

at net.minecraft.client.main.Main.main(Main.java:117) [Main.class:?]

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.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.11.jar:?]

at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]

at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:85) [start/:?]

at GradleStart.main(GradleStart.java:45) [start/:?]

[19:40:59] [Client thread/INFO] [sTDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:660]: ---- Minecraft Crash Report ----

 

 

Here is my code now

	@SubscribeEvent
public void blastResist(LivingHurtEvent event, EntityMetalZertum entity){
	if(event.entity instanceof EntityMetalZertum){
		this.entity = entity;

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

	System.out.println(event.ammount);
}

[Failender]

You cant just add another variable to the method.

I would highly recommend you to learn more about java and how it works.

For now.

 

I guess you want to reduce the damage taken from an explosion if the affected entity is an EntityMetalZertum.

 

The event got the event.entity .

You can check if the entity is an instance of EntityMetalZertum and if it is an EntityMetalZertum you can cast it to one and then get the blastResist from it.

 

[NovaViper]

Ok, I can't tell if it's working exactly but I do notice that it takes alot more grenades to kill it than with normal Zertums, also here is some debug numbers I got

 

[20:12:54] [server thread/INFO] [sTDOUT]: [common.zeroquest.command.CommandZeroQuest$TameModifier:modify:231]: Tamed! //Taming Metal Zertum
2.0
2.0
0.0
4.6

With a normal Zertum, it takes 2 grenades to kill it, but with this on the Metal Zertums, it takes like, 8 or 9 grenades.

[NovaViper]

It seems to work, because if the attribute is set to 0, it instantly kills the entity (also in the debug, it says "Infinity" instead of a number). When I hit the grenade with a regular Zertum, it says like 5.0 - 19.0, for Metal Zertums though (when the attribute is set to 5.0), it says 0.0 - 3.0.

 

===EDIT===

Yeah, it's working. Thanks!