TinkersConstruct/test/XinBuilder.java

package test;

import net.minecraft.block.Block;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.Icon;
import net.minecraft.util.MathHelper;
import net.minecraft.util.MovingObjectPosition;
import net.minecraft.util.Vec3;
import net.minecraft.world.World;
import net.minecraftforge.common.ForgeDirection;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

/*
 * mDiyo's development building item
 * Builds everything on right-click!
 */

public class XinBuilder extends Item
{
    public XinBuilder(int id)
    {
        super(id);
        setCreativeTab(CreativeTabs.tabMisc);
    }

    public Icon getIconFromDamage (int damage)
    {
        return Item.hoeStone.getIconFromDamage(damage);
    }
    
    public ItemStack onItemRightClick(ItemStack stack, World world, EntityPlayer player)
    {
        placeBlock(player);
        return stack;
    }

    /*public boolean onItemUse (ItemStack stack, EntityPlayer player, World world, int x, int y, int z, int side, float clickX, float clickY, float clickZ)
    {
        System.out.println("Rawr!");
        return true;
    }*/

    @SideOnly(Side.CLIENT)
    public void onUpdate (ItemStack stack, World world, Entity entity, int par4, boolean par5)
    {

    }

    @Override
    public boolean onEntitySwing (EntityLivingBase entityLiving, ItemStack stack)
    {
        if (entityLiving instanceof EntityPlayer && !mod_Test.leftClick)
        {
            EntityPlayer player = (EntityPlayer) entityLiving;
            placeBlock(player);
            mod_Test.leftClick = true;
        }
        return true;
    }
    
    public void placeBlock(EntityPlayer player)
    {
        MovingObjectPosition mop = this.raytraceFromPlayer(player.worldObj, player, false);

        if (mop != null)
        {
            int xPos = mop.blockX;
            int yPos = mop.blockY;
            int zPos = mop.blockZ;
            ForgeDirection sideHit = ForgeDirection.getOrientation(mop.sideHit);
            switch (sideHit)
            {
            case UP:
            {
                yPos += 1;
                break;
            }
            case DOWN:
            {
                yPos -= 1;
                break;
            }
            case NORTH:
            {
                zPos -= 1;
                break;
            }
            case SOUTH:
            {
                zPos += 1;
                break;
            }
            case EAST:
            {
                xPos += 1;
                break;
            }
            case WEST:
            {
                xPos -= 1;
                break;
            }
            default:
                break;
            }
            player.worldObj.setBlock(xPos, yPos, zPos, Block.stone.blockID);
        }
    }

    public MovingObjectPosition raytraceFromPlayer (World par1World, EntityPlayer par2EntityPlayer, boolean par3)
    {
        float f = 1.0F;
        float f1 = par2EntityPlayer.prevRotationPitch + (par2EntityPlayer.rotationPitch - par2EntityPlayer.prevRotationPitch) * f;
        float f2 = par2EntityPlayer.prevRotationYaw + (par2EntityPlayer.rotationYaw - par2EntityPlayer.prevRotationYaw) * f;
        double d0 = par2EntityPlayer.prevPosX + (par2EntityPlayer.posX - par2EntityPlayer.prevPosX) * (double) f;
        double d1 = par2EntityPlayer.prevPosY + (par2EntityPlayer.posY - par2EntityPlayer.prevPosY) * (double) f + 1.62D - (double) par2EntityPlayer.yOffset;
        double d2 = par2EntityPlayer.prevPosZ + (par2EntityPlayer.posZ - par2EntityPlayer.prevPosZ) * (double) f;
        Vec3 vec3 = par1World.getWorldVec3Pool().getVecFromPool(d0, d1, d2);
        float f3 = MathHelper.cos(-f2 * 0.017453292F - (float) Math.PI);
        float f4 = MathHelper.sin(-f2 * 0.017453292F - (float) Math.PI);
        float f5 = -MathHelper.cos(-f1 * 0.017453292F);
        float f6 = MathHelper.sin(-f1 * 0.017453292F);
        float f7 = f4 * f5;
        float f8 = f3 * f5;
        double d3 = 500.0D; //Max range
        Vec3 vec31 = vec3.addVector((double) f7 * d3, (double) f6 * d3, (double) f8 * d3);
        return par1World.rayTraceBlocks_do_do(vec3, vec31, par3, !par3);
    }
}