ItemBallista.java

package com.arkcraft.module.weapon.common.item;

import com.arkcraft.module.weapon.common.entity.EntityBallista;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Blocks;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.BlockPos;
import net.minecraft.util.MathHelper;
import net.minecraft.util.MovingObjectPosition;
import net.minecraft.util.MovingObjectPosition.MovingObjectType;
import net.minecraft.util.Vec3;
import net.minecraft.world.World;

public class ItemBallista extends Item
{

    public ItemBallista()
    {
        super();
        maxStackSize = 1;
    }

    @Override
    public int getItemEnchantability()
    {
        return 10;
    }

    @Override
    public ItemStack onItemRightClick(ItemStack itemstack, World world, EntityPlayer entityplayer)
    {
        float f = 1.0F;
        float f1 = entityplayer.prevRotationPitch + (entityplayer.rotationPitch - entityplayer.prevRotationPitch) * f;
        float f2 = entityplayer.prevRotationYaw + (entityplayer.rotationYaw - entityplayer.prevRotationYaw) * f;
        double d = entityplayer.prevPosX + (entityplayer.posX - entityplayer.prevPosX) * f;
        double d1 = (entityplayer.prevPosY + (entityplayer.posY - entityplayer.prevPosY) * f + 1.6200000000000001D);
        double d2 = entityplayer.prevPosZ + (entityplayer.posZ - entityplayer.prevPosZ) * f;
        Vec3 vec3d = new Vec3(d, d1, d2);
        float f3 = MathHelper.cos(-f2 * 0.01745329F - 3.141593F);
        float f4 = MathHelper.sin(-f2 * 0.01745329F - 3.141593F);
        float f5 = -MathHelper.cos(-f1 * 0.01745329F);
        float f6 = MathHelper.sin(-f1 * 0.01745329F);
        float f7 = f4 * f5;
        float f8 = f6;
        float f9 = f3 * f5;
        double d3 = 5D;
        Vec3 vec3d1 = vec3d.addVector(f7 * d3, f8 * d3, f9 * d3);
        MovingObjectPosition movingobjectposition = world.rayTraceBlocks(vec3d, vec3d1, true);
        BlockPos blockpos = movingobjectposition.getBlockPos();

        if (movingobjectposition != null)
        {
            if (movingobjectposition.typeOfHit == MovingObjectType.BLOCK)
            {
                int i = blockpos.getX();
                int j = blockpos.getY();
                int k = blockpos.getZ();
                if (!world.isRemote)
                {
                    if (world.getBlockState(blockpos) == Blocks.snow)
                    {
                        j--;
                    }
                    world.spawnEntityInWorld(new EntityBallista(world, i + 0.5F, j + 1.0F, k + 0.5F));
                }
                if (!entityplayer.capabilities.isCreativeMode || !world.isRemote)
                {
                    itemstack.stackSize--;
                }
            }
        }
        return itemstack;
    }
}