I'm new to Minecraft modding but have experience in Java.  

I used some tutorials in order to add an item, so now I want to give this item a purpose.  

There are 2 main things I'm trying to solve:  

1. If the player right clicks on the ground while holding my item, I need to save the coordinates, in order to spawn blocks at that location
2. I somehow need to write commands in the in game chat to spawn the blocks, I was thinking something like "/setblock <COORDINATES_FROM_RIGHT_CLICK> <BLOCK_TYPE>. (maybe there is a better way?)

 I probably need some kind of EventHandler for both, but I have no idea where to start.  

Maybe someone can give me some tips and help me go in the right direction, I would be very thankful.  

In the following I will post the code I have so far.  

 

Main mod class:

Spoiler

package com.opkekz.imagespawner;

import com.opkekz.imagespawner.configuration.ConfigurationHandler;
import com.opkekz.imagespawner.init.ModItems;
import com.opkekz.imagespawner.item.ImageSpawnerItem;
import com.opkekz.imagespawner.proxy.IProxy;
import com.opkekz.imagespawner.reference.Reference;

import net.minecraft.item.Item;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.SidedProxy;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPostInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import net.minecraftforge.fml.common.registry.GameRegistry;

@Mod(modid=Reference.MOD_ID, name=Reference.MOD_NAME, version=Reference.VERSION)
public class ImageSpawner {
    
    @Mod.Instance(Reference.MOD_ID)
    public static ImageSpawner instance;
    
    @SidedProxy(clientSide=Reference.CLIENT_PROXY, serverSide=Reference.SERVER_PROXY)
    public static IProxy proxy;

    @Mod.EventHandler
    public void preInit(FMLPreInitializationEvent event) {
        ConfigurationHandler.init(event.getSuggestedConfigurationFile());
        ModItems.init();
        
    }
    
    @Mod.EventHandler
    public void init(FMLInitializationEvent event) {
        proxy.init();
    }
    
    @Mod.EventHandler
    public void postInit(FMLPostInitializationEvent event) {
        
    }
    
}

 

Reference class:  

Spoiler

package com.opkekz.imagespawner.reference;

public class Reference {
    
    public static final String MOD_ID = "imagespawner";
    public static final String MOD_NAME = "ImageSpawner";
    public static final String VERSION = "1.12.2-1.0";
    public static final String CLIENT_PROXY = "com.opkekz.imagespawner.proxy.ClientProxy";
    public static final String SERVER_PROXY = "com.opkekz.imagespawner.proxy.ServerProxy";
    
    public static enum ImageSpawnerEnum {
        IMAGESPAWNER("spawner", "imagespawner");
        
        private String unlocalizedName;
        private String registryName;
        
        ImageSpawnerEnum(String unlocalizedName, String registryName) {
            this.unlocalizedName = unlocalizedName;
            this.registryName = registryName;
        }
        
        public String getRegistryName() {
            return registryName;
        }
        
        public String getUnlocalizedName() {
            return unlocalizedName;
        }
    }

}

 

ModItems class:  

Spoiler

package com.opkekz.imagespawner.init;

import java.util.HashSet;
import java.util.Set;

import com.opkekz.imagespawner.item.ImageSpawnerItem;
import com.opkekz.imagespawner.reference.Reference;

import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.block.model.ModelResourceLocation;
import net.minecraft.item.Item;
import net.minecraftforge.event.RegistryEvent;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.common.registry.ForgeRegistries;
import net.minecraftforge.registries.IForgeRegistry;

@Mod.EventBusSubscriber(modid=Reference.MOD_ID)
public class ModItems {
    
    public static final ImageSpawnerItem spawner = new ImageSpawnerItem();
    
    public static void init() {
        
        //spawner.setRegistryName("imageSpawner");
        ForgeRegistries.ITEMS.register(spawner);
        
    }
    
    public static void registerRenders() {
        registerRender(spawner);
    }
    
    public static void registerRender(Item item) {
        Minecraft.getMinecraft().getRenderItem().getItemModelMesher().register(item, 0, new ModelResourceLocation(item.getRegistryName(), "inventory"));  // I read on this forum that this is not the ideal approach, but it's working for me
    }
    
}

 

Item class:  

Spoiler

package com.opkekz.imagespawner.item;

import com.google.common.eventbus.Subscribe;
import com.opkekz.imagespawner.reference.Reference;

import net.minecraft.client.Minecraft;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.network.play.client.CPacketChatMessage;
import net.minecraft.server.MinecraftServer;
import net.minecraft.world.World;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

public class ImageSpawnerItem extends Item{
    
    public ImageSpawnerItem() {
        
        super();
        this.setCreativeTab(CreativeTabs.TOOLS);
        setUnlocalizedName(Reference.ImageSpawnerEnum.IMAGESPAWNER.getUnlocalizedName());
        setRegistryName(Reference.ImageSpawnerEnum.IMAGESPAWNER.getRegistryName());
        
    }
    
    
    @Override
    public String getUnlocalizedName() {
        
        return String.format("item.%s%s", Reference.MOD_ID.toLowerCase() + ":", getUnwrappedUnlocalizedName(super.getUnlocalizedName()));
        
    }
    
    @Override
    public String getUnlocalizedName(ItemStack itemStack) {
        return String.format("item.%s%s", Reference.MOD_ID.toLowerCase() + ":", getUnwrappedUnlocalizedName(super.getUnlocalizedName()));
    }
    
    protected String getUnwrappedUnlocalizedName(String unlocalizedName) {
        return unlocalizedName.substring(unlocalizedName.indexOf(".") + 1);
    }

}

 If there are more information I can give, please let me know.

6 minutes ago, diesieben07 said:

• It is not "not ideal", it is fundamentally broken and causes problems. Your way of doing it will additionally completely crash a dedicated server.

• Your code does not even contain any kind of attempt at the problems you are describing. What have you tried?

I don't plan on releasing the mod, it's just a project I'm doing and I wanted to try to implement it in Minecraft.  

 

I tried some methods that I found on other posts with similar questions, but none worked:  

For example:

@Subscribe
	public ItemStack onItemRightClick(ItemStack par1ItemStack, World par2World, EntityPlayer par3EntityPlayer)
	{
		String command = "Hello, Test!";
		Minecraft.getMinecraft().getConnection().sendPacket((new CPacketChatMessage("/help")));
		return par1ItemStack;
	}

I couldn't figure out how to use the "@Subscribe" annotation properly

Edited April 26, 20196 yr by Kekz

4 minutes ago, diesieben07 said:

I am not even sure what that code is supposed to achieve.

• Item#onItemUse will be called when your item is used (right-clicked) on a block.
• "Spawning" blocks can be done via World#setBlockState on the server. There is no need to send packets or chat messages.

Thanks, I will look into those methods.  

For clarification: I wrote some code that takes an image and transforms each pixel into a String, like "yellow".  

I thought I could make a mod out of this, where you can instantly spawn an image. (May already exist)

Edited April 26, 20196 yr by Kekz

7 minutes ago, Kekz said:

For clarification: I wrote some code that takes an image and transforms each pixel into a String, like "yellow".  

I thought I could make a mod out of this, where you can instantly spawn an image. (May already exist)

Sorry, but your clarification is slightly ambiguous.

What do you mean by "spawn an image"?

Edited April 26, 20196 yr by DavidM

1 minute ago, DavidM said:

Sorry, but your clarification is slightly ambiguous.

What do you mean by "spawn an image"?

Each pixel of the image will be mapped to a String, in this case a Minecraftblock. Then these blocks will be spawned in order to create the image.

12 minutes ago, Kekz said:

Each pixel of the image will be mapped to a String, in this case a Minecraftblock. Then these blocks will be spawned in order to create the image.

In this case you should just map each color to a block; there is no need for strings.

Something like Map<Color, Block> should suffice.

1 minute ago, DavidM said:

In this case you should just map each color to a block; there is no need for strings.

Something like Map<Color, Block> should suffice.

Thanks, but that's not the part of the mod I'm having issues with ^^

36 minutes ago, diesieben07 said:

Item#onItemUse will be called when your item is used (right-clicked) on a block.

Is there an event for that? I tried the example from the Forge Doc with the EntityItemPickUpEvent, and that works.  

Couldn't find any Events that are called on Item use.

At least now I have somewhere to start.

The player interact event has a few subclasses that do what you want.

 

Also: http://wiki.c2.com/?StringlyTyped

2 minutes ago, Cadiboo said:

The player interact event has a few subclasses that do what you want.

Thanks.  

 

2 minutes ago, Cadiboo said:

Also: http://wiki.c2.com/?StringlyTyped

The String thing is only the way I currently have it implemented, without Minecraft modding in mind.... 

45 minutes ago, Kekz said:

Thanks, but that's not the part of the mod I'm having issues with ^^

I thought your main problem was fixed...

If you want to implement the behavior on a custom item, just override Item#onItemUse.

22 minutes ago, DavidM said:

If you want to implement the behavior on a custom item, just override Item#onItemUse.

That seems the best solution, it already works for small 10 x 10 matrices.

Is there a way to spawn colored wool with 

worldIn.setBlockState(pos, state);

I use 

Blocks.CLAY.getDefaultState();

to spawn a clay block, but I can only find  

Blocks.WOOL;

with no option for colored wool.

I don't know exactly what you need to do but I think it needs to be something along the lines of

Blocks.WOOL.getDefaultState().withProperty();

Thing is I have not messed with wool so I don't know what properties it has or what you need to put inside the withProperty() part

On 4/26/2019 at 7:21 PM, Blue_Atlas said:

I don't know exactly what you need to do but I think it needs to be something along the lines of

Blocks.WOOL.getDefaultState().withProperty();

Thing is I have not messed with wool so I don't know what properties it has or what you need to put inside the withProperty() part

Figured it out btw:  

Create a PropertyEnum constant for the EnumDyeColor "COLOR":

public static final PropertyEnum<EnumDyeColor> COLOR = PropertyEnum.<EnumDyeColor>create("color", EnumDyeColor.class);

Select a color for wool (should also work for clay):  

Blocks.WOOL.getDefaultState().withProperty(COLOR, EnumDyeColor.WHITE);

 

4 hours ago, Kekz said:

Create a PropertyEnum constant for the EnumDyeColor "COLOR":

public static final PropertyEnum<EnumDyeColor> COLOR = PropertyEnum.<EnumDyeColor>create("color", EnumDyeColor.class);

Select a color for wool (should also work for clay):  

Blocks.WOOL.getDefaultState().withProperty(COLOR, EnumDyeColor.WHITE);

 

No. Use BlockWool.COLOR or whatever it’s called