ForgeEventHandler.java

package com.brandon3055.townbuilder;

import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.text.TextComponentString;
import net.minecraftforge.event.entity.player.PlayerInteractEvent;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;

/**
 * Created by Brandon on 22/01/2015.
 */
public class ForgeEventHandler {

	@SubscribeEvent
	public void playerInteract(PlayerInteractEvent event)
	{
		if (!(event instanceof PlayerInteractEvent.LeftClickBlock || event instanceof PlayerInteractEvent.RightClickBlock) || event.getEntityPlayer().getHeldItemMainhand() == null || event.getEntityPlayer().getHeldItemMainhand().getItem() != TBFeatures.schematicTool) {
			return;
		}

		ItemStack tool = event.getEntityPlayer().getHeldItemMainhand();

		if (event instanceof PlayerInteractEvent.LeftClickBlock)
		{
			if (!tool.hasTagCompound()) tool.setTagCompound(new NBTTagCompound());
			if (tool.getTagCompound().getInteger("Pos1Y") == -1)
			{
				tool.getTagCompound().setInteger("Pos2X", event.getPos().getX());
				tool.getTagCompound().setInteger("Pos2Y", event.getPos().getY());
				tool.getTagCompound().setInteger("Pos2Z", event.getPos().getZ());
			}
			tool.getTagCompound().setInteger("Pos1X", event.getPos().getX());
			tool.getTagCompound().setInteger("Pos1Y", event.getPos().getY());
			tool.getTagCompound().setInteger("Pos1Z", event.getPos().getZ());
			event.getEntityPlayer().addChatComponentMessage(new TextComponentString("Pos1 Set"));
			event.setCanceled(true);
		}
		else if (event instanceof PlayerInteractEvent.RightClickBlock)
		{
			if (!tool.hasTagCompound()) tool.setTagCompound(new NBTTagCompound());
			if (tool.getTagCompound().getInteger("Pos1Y") == -1)
			{
				tool.getTagCompound().setInteger("Pos1X", event.getPos().getX());
				tool.getTagCompound().setInteger("Pos1Y", event.getPos().getY());
				tool.getTagCompound().setInteger("Pos1Z", event.getPos().getZ());
			}

			tool.getTagCompound().setInteger("Pos2X", event.getPos().getX());
			tool.getTagCompound().setInteger("Pos2Y", event.getPos().getY());
			tool.getTagCompound().setInteger("Pos2Z", event.getPos().getZ());
			if (event.getEntityPlayer().worldObj.isRemote)event.getEntityPlayer().addChatComponentMessage(new TextComponentString("Pos2 Set"));
			else event.setCanceled(true);
		}
	}
}