Working with custom tools with special abilities

BHGgaming · December 12, 2015

im kind of new to forge modding, does anyone know how to get blocks to drop a specific drop when mined with a specific tool, for example say I have a pickaxe named "Smelting Pick" and drops stone when mining stone, iron when mining iron ore, ect. any help is appreciated

Ernio · December 12, 2015

Read aboud Forge Events.

Use @SubscribeEvent to setup HarvestDropsEvent.

Modify droplist (event.drops) depending on miner's tool (event.harvester).

To get the tool you need to access inventory (held item):

event.harvester.inventory.getCurrentItem();

Comparing item should be made on Item.class with "==" (items are singletons),e.g:

ItemStack#getItem() == MyMod.mySuperPickaxeInstance

Finally, post your code (what you tried) to get more help/tips.

BHGgaming · December 12, 2015

So i understand is, but i am unable to pull the block being mined from the event.

here is my code for the Event Handler:

package com.biohazard.gems;

import com.biohazard.gems.items.GemItems;

import net.minecraft.block.Block;

import net.minecraft.entity.player.EntityPlayer;

import net.minecraft.item.Item;

import net.minecraft.item.ItemStack;

import net.minecraftforge.event.world.BlockEvent;

import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

public class GemEventHandler {

@SubscribeEvent

public void infusedPick(BlockEvent.HarvestDropsEvent event){

EntityPlayer player = event.harvester;

ItemStack heldItem = player.inventory.getCurrentItem();

if(heldItem == null){

return;

}

if(heldItem == new ItemStack(GemItems.redPoweredPick)) {

/*psuedo if block being mined is an ore, remove ore block from event.drops

*add smelted item to event.drops

*/

}

ovikk · December 12, 2015

Every event that is an instance of BlockEvent has a BlockPos which stores the coordinates. BlockEvent also has tha IBlockState. You can get the block from an IBlockState by adding .getBlock().

BHGgaming · December 12, 2015

Every event that is an instance of BlockEvent has a BlockPos which stores the coordinates. BlockEvent also has tha IBlockState. You can get the block from an IBlockState by adding .getBlock().

i was about to see if i could just get the blocks pos., then see what block was in that pos. Thank you very much

Ernio · December 12, 2015

Comparing item should be made on Item.class with "==" (items are singletons),e.g:

ItemStack#getItem() == MyMod.mySuperPickaxeInstance

It is bad practice to make new ItemStack just to compate items.

Only case in which you could justify it would be compating whole Stacks (their NBT and size/damage).

Also, in any case, that (what you did) won't work. "==" is instance comparing. Currently held item will be only ever equal to itself. If you want to compare it to other ItemStack instance you need to use .equals (note: idk if ItemStack uses equals ).

BHGgaming · December 12, 2015

okay.. so i have my event in a spoiler below, and when mining stone, it still drops cobblestone, and when mining iron ore, it produces the following crash report

any help is greatly appreiciated

Crash Report:

---- Minecraft Crash Report ----

// On the bright side, I bought you a teddy bear!

Time: 12/12/15 4:00 PM

Description: Exception ticking world

java.lang.NullPointerException: Exception ticking world

at com.biohazard.gems.GemEventHandler.infusedPick(GemEventHandler.java:18)

at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_6_GemEventHandler_infusedPick_HarvestDropsEvent.invoke(.dynamic)

at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:55)

at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:140)

at net.minecraftforge.event.ForgeEventFactory.fireBlockHarvesting(ForgeEventFactory.java:190)

at net.minecraft.block.Block.dropBlockAsItemWithChance(Block.java:611)

at net.minecraft.block.Block.dropBlockAsItem(Block.java:597)

at net.minecraft.block.BlockDoublePlant.checkAndDropBlock(BlockDoublePlant.java:95)

at net.minecraft.block.BlockBush.updateTick(BlockBush.java:57)

at net.minecraft.block.Block.randomTick(Block.java:528)

at net.minecraft.world.WorldServer.updateBlocks(WorldServer.java:467)

at net.minecraft.world.WorldServer.tick(WorldServer.java:228)

at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:764)

at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:669)

at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:171)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:540)

at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:

---------------------------------------------------------------------------------------

-- Head --

Stacktrace: