@SubscribeEvent
    public static void crimsonIngotCraft(EntityJoinWorldEvent event){
        Entity entity = event.getEntity();
        if(entity instanceof ItemEntity){
            ItemEntity itemEntity = (ItemEntity) event.getEntity();
            if(itemEntity.getItem().getItem() == itemInit.RED_PEARL.get()){
                System.out.println("Working!!");
                if(itemEntity.isInWater()){
                    System.out.println("Not working :(");
                    itemEntity.remove();
                  	//FIXME Continue.
                }
            }
        }
    }

Everything is working except the

if(itemEntity.isInWater()){
                    System.out.println("Not working :(");
                    itemEntity.remove();
                }

this part. I wanna create a recipe that you throw an item into water and water transforms into another block.

Well of course. That would only be true if the entity spawned already in the water.

(Try throwing your item while under water).

 

If you want to check for it being in water some time later you need to replace the entity with a custom entity and override the relevant method (there should already be one for when an entity is in water, or enters water, but Update would also work).

Edited January 3, 20214 yr by Draco18s

    @SubscribeEvent
    public static void crimsonIngotCraft(EntityJoinWorldEvent event){
        Entity entity = event.getEntity();
        World world = entity.world;
        double posX = entity.getPosX();
        double posY = entity.getPosY();
        double posZ = entity.getPosZ();
        if(entity instanceof ItemEntity && !(entity instanceof SpecialItemEntity)){
            ItemEntity itemEntity = (ItemEntity) event.getEntity();
            if(itemEntity.getItem().getItem() == itemInit.RED_PEARL.get()){
                SpecialItemEntity ie = new SpecialItemEntity(entity.world,entity.getPosX(),entity.getPosY(),entity.getPosZ(),((ItemEntity) entity).getItem());
                event.setCanceled(true);
                SpecialItemEntity specialItemEntity = new SpecialItemEntity(world,posX,posY,posZ,((ItemEntity) entity).getItem().getStack());
            }
        }
    }

I changed code into this and SpecialItemEntity clas is:

package com.azizd.thunderbird.entities;

import com.azizd.thunderbird.init.blockInit;
import net.minecraft.entity.item.ItemEntity;
import net.minecraft.item.ItemStack;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;

public class SpecialItemEntity extends ItemEntity {
    public SpecialItemEntity(World worldIn, double x, double y, double z, ItemStack stack) {
        super(worldIn, x, y, z, stack);
    }

    @Override
    public void tick() {
        BlockPos pos= new BlockPos(getPosX(),getPosY(),getPosZ());
        if(inWater){
            this.setDead();
            this.world.setBlockState(pos,blockInit.BLOCK_OF_RED_PEARL.get().getDefaultState());
        }
    }
}

The item deletes when i press the q button.

You are canceling the event but you are not spawning your custom entity in the world. Also if you just need to change your item into something else when that item touches water i think you could just override the onEntityItemUpdate method inside your item class

It is kinda working right now.

This is EventHandler part

public static void crimsonIngotCraft(EntityJoinWorldEvent event){
        Entity entity = event.getEntity();
        World world = entity.world;
        double posX = entity.getPosX();
        double posY = entity.getPosY();
        double posZ = entity.getPosZ();
        if(entity instanceof ItemEntity && !(entity instanceof SpecialItemEntity)){
            ItemEntity itemEntity = (ItemEntity) event.getEntity();
            if(itemEntity.getItem().getItem() == itemInit.RED_PEARL.get()){
                event.setCanceled(true);
                SpecialItemEntity specialItemEntity = new SpecialItemEntity(world,posX,posY,posZ);
                specialItemEntity.setItem(itemEntity.getItem());
                world.addEntity(specialItemEntity);
            }
        }
    }

 

and this is the special item entity class
 

package com.azizd.thunderbird.entities;

import com.azizd.thunderbird.init.itemInit;
import net.minecraft.entity.item.ItemEntity;
import net.minecraft.item.ItemStack;
import net.minecraft.world.World;
import net.minecraftforge.common.extensions.IForgeEntity;

public class SpecialItemEntity extends ItemEntity implements IForgeEntity {
    public SpecialItemEntity(World worldIn, double x, double y, double z) {
        super(worldIn, x, y, z);
    }

    @Override
    public void tick() {
        ItemEntity entity = new ItemEntity(getEntityWorld(),this.getPosX(),this.getPosY(),this.getPosZ());
        if(this.inWater){
            this.setDead();
            entity.setItem(new ItemStack(itemInit.CRIMSON_INGOT.get()));
            this.world.addEntity(entity);
        }
        ItemStack stack = this.getItem();

        if (stack != null && stack.getItem() != null && stack.getItem().onEntityItemUpdate(this.getItem(),entity)) return;
        if(entity == null) this.setDead();
        else{
            super.tick();
            this.setDefaultPickupDelay();
            this.prevPosX = this.getPosX();
            this.prevPosY = this.getPosY();
            this.prevPosZ = this.getPosZ();
            this.setMotion(0,-0.098,0);
        }
    }
}

 

The item converting part is complete but i can't pickup the item i threw and motion part is bad. When i  throw a whole stack it gives 1 single item rather than giving a stack.

3 hours ago, AzizD said:

ItemEntity entity = new ItemEntity(getEntityWorld(),this.getPosX(),this.getPosY(),this.getPosZ());

Why are you creating a new ItemEntity every tick?

  

3 hours ago, AzizD said:

if (stack != null && stack.getItem() != null

Neither of these will ever be true.

Edited January 5, 20214 yr by Draco18s

I am settting the pickup delay to default every tick. This is why i cant pick up the item. The motion part is incomplete so item drop part is bad.

No, you're creating a new entity, diddling some of its values, and then throwing it in the garbage when the method returns.

On 1/4/2021 at 4:21 PM, AzizD said:

if(entity == null)

This is also never false because you set entity = new ItemEntity already.

I solved the pickup bug. The only problem is SpecialItemEntity motion.

Finally i fixed all the problems. Now it works exactly what i want.

 

This is my EventHandler Method 

@SubscribeEvent
    public static void crimsonIngotCraft(EntityJoinWorldEvent event){
        Entity entity = event.getEntity();
        World world = entity.world;
        double posX = entity.getPosX();
        double posY = entity.getPosY();
        double posZ = entity.getPosZ();
        if(entity instanceof ItemEntity && !(entity instanceof SpecialItemEntity)){
            ItemEntity itemEntity = (ItemEntity) event.getEntity();
            if(itemEntity.getItem().getItem() == itemInit.RED_PEARL.get()){
                event.setCanceled(true);
                SpecialItemEntity specialItemEntity = new SpecialItemEntity(world,posX,posY,posZ);
                specialItemEntity.setItem(itemEntity.getItem().getStack());
                specialItemEntity.setPickupDelay(50);
                specialItemEntity.setMotion(itemEntity.getMotion());
                world.addEntity(specialItemEntity);
            }
        }
    }

 

And this is my SpecialItemEntity class

package com.azizd.thunderbird.entities;

import com.azizd.thunderbird.init.itemInit;
import net.minecraft.entity.item.ItemEntity;
import net.minecraft.item.ItemStack;
import net.minecraft.world.World;
import net.minecraftforge.common.extensions.IForgeEntity;

public class SpecialItemEntity extends ItemEntity implements IForgeEntity {
    public SpecialItemEntity(World worldIn, double x, double y, double z) {
        super(worldIn, x, y, z);
    }
    ItemEntity entity = new ItemEntity(getEntityWorld(),this.getPosX(),this.getPosY(),this.getPosZ());

    @Override
    public void tick() {
        if(this.inWater){
            this.setDead();
            int count = this.getItem().getCount();
            entity.setPosition(this.getPosX(),this.getPosY(),this.getPosZ());
            entity.setItem(new ItemStack(itemInit.CRIMSON_INGOT.get()));
            entity.getItem().setCount(count);
            this.world.addEntity(entity);
        }
        else{
            super.tick();
        }
    }
}

Thanks for the helps.

But i still have a bug. If specialItemEntity is in the world. I can't join that world.

Why do you keep adding the same entity to the world every tick?

Edit: my bad, misread the code.

 

 

Edited January 13, 20214 yr by poopoodice

3 hours ago, AzizD said:

ItemEntity entity = new ItemEntity(getEntityWorld(),this.getPosX(),this.getPosY(),this.getPosZ());

Why is this a class property and not a local variable?

53 minutes ago, Draco18s said:

Why is this a class property and not a local variable?

This is not the issue.

17 minutes ago, AzizD said:

This is not the issue.

I didn't say it was. I was asking why you did it because its stupid.

Finally i fixed the all problems. I added this condition and thats all.

world.chunkExists(specialItemEntity.chunkCoordX,specialItemEntity.chunkCoordZ)

 

Final code is :

 

EventHandler class

package com.azizd.thunderbird.events;

import com.azizd.thunderbird.Thunderbird;
import com.azizd.thunderbird.entities.SpecialItemEntity;
import com.azizd.thunderbird.init.itemInit;
import net.minecraft.entity.Entity;
import net.minecraft.entity.item.ItemEntity;
import net.minecraft.item.ItemStack;
import net.minecraft.world.World;
import net.minecraftforge.event.entity.EntityJoinWorldEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;

@Mod.EventBusSubscriber(modid = Thunderbird.MOD_ID, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class EventHandler {
    public static void register(){}

    @SubscribeEvent
    public static void crimsonIngotCraft(EntityJoinWorldEvent event){
        Entity entity = event.getEntity();
        World world = entity.world;
        double posX = entity.getPosX();
        double posY = entity.getPosY();
        double posZ = entity.getPosZ();
        SpecialItemEntity specialItemEntity = new SpecialItemEntity(world, posX, posY, posZ);

        if(entity instanceof ItemEntity && !(entity instanceof SpecialItemEntity)){
            ItemEntity itemEntity = (ItemEntity) event.getEntity();
            ItemStack item = itemEntity.getItem();
            if(item.getItem() == itemInit.RED_PEARL.get()){
                if(world.chunkExists(specialItemEntity.chunkCoordX,specialItemEntity.chunkCoordZ)) {
                    event.setCanceled(true);
                    specialItemEntity.setItem(itemEntity.getItem().getStack());
                    specialItemEntity.setPickupDelay(30);
                    specialItemEntity.setMotion(itemEntity.getMotion());
                    world.addEntity(specialItemEntity);
                }
            }
        }
    }
}

 

SpecialItemEntity class

package com.azizd.thunderbird.entities;

import com.azizd.thunderbird.init.itemInit;
import net.minecraft.entity.item.ItemEntity;
import net.minecraft.item.ItemStack;
import net.minecraft.world.World;

public class SpecialItemEntity extends ItemEntity {
    private ItemEntity entity = new ItemEntity(this.world,this.getPosX(),this.getPosY(),this.getPosZ());

    public SpecialItemEntity(World worldIn, double x, double y, double z) {
        super(worldIn, x, y, z);
    }

    @Override
    public void tick() {
        if(this.inWater && !this.world.isRemote){
            this.setDead();
            int count = this.getItem().getCount();
            entity.setPosition(this.getPosX(),this.getPosY(),this.getPosZ());
            entity.setItem(new ItemStack(itemInit.CRIMSON_INGOT.get()));
            entity.getItem().setCount(count);
            this.world.addEntity(entity);
        }
        else{
            super.tick();
        }
    }
}

 

https://github.com/MinecraftForge/MinecraftForge/blob/1.16.x/src/main/java/net/minecraftforge/common/extensions/IForgeItem.java#L290-L305