    001    package net.minecraft.entity.projectile;
    002
    003    import cpw.mods.fml.relauncher.Side;
    004    import cpw.mods.fml.relauncher.SideOnly;
    005    import java.util.List;
    006    import net.minecraft.block.Block;
    007    import net.minecraft.enchantment.EnchantmentThorns;
    008    import net.minecraft.entity.Entity;
    009    import net.minecraft.entity.EntityLiving;
    010    import net.minecraft.entity.IProjectile;
    011    import net.minecraft.entity.monster.EntityEnderman;
    012    import net.minecraft.entity.player.EntityPlayer;
    013    import net.minecraft.entity.player.EntityPlayerMP;
    014    import net.minecraft.item.Item;
    015    import net.minecraft.item.ItemStack;
    016    import net.minecraft.nbt.NBTTagCompound;
    017    import net.minecraft.network.packet.Packet70GameEvent;
    018    import net.minecraft.util.AxisAlignedBB;
    019    import net.minecraft.util.DamageSource;
    020    import net.minecraft.util.MathHelper;
    021    import net.minecraft.util.MovingObjectPosition;
    022    import net.minecraft.util.Vec3;
    023    import net.minecraft.world.World;
    024
    025    public class EntityArrow extends Entity implements IProjectile
    026    {
    027        private int xTile = -1;
    028        private int yTile = -1;
    029        private int zTile = -1;
    030        private int inTile = 0;
    031        private int inData = 0;
    032        private boolean inGround = false;
    033
    034        /** 1 if the player can pick up the arrow */
    035        public int canBePickedUp = 0;
    036
    037        /** Seems to be some sort of timer for animating an arrow. */
    038        public int arrowShake = 0;
    039
    040        /** The owner of this arrow. */
    041        public Entity shootingEntity;
    042        private int ticksInGround;
    043        private int ticksInAir = 0;
    044        private double damage = 2.0D;
    045
    046        /** The amount of knockback an arrow applies when it hits a mob. */
    047        private int knockbackStrength;
    048
    049        public EntityArrow(World par1World)
    050        {
    051            super(par1World);
    052            this.renderDistanceWeight = 10.0D;
    053            this.setSize(0.5F, 0.5F);
    054        }
    055
    056        public EntityArrow(World par1World, double par2, double par4, double par6)
    057        {
    058            super(par1World);
    059            this.renderDistanceWeight = 10.0D;
    060            this.setSize(0.5F, 0.5F);
    061            this.setPosition(par2, par4, par6);
    062            this.yOffset = 0.0F;
    063        }
    064
    065        public EntityArrow(World par1World, EntityLiving par2EntityLiving, EntityLiving par3EntityLiving, float par4, float par5)
    066        {
    067            super(par1World);
    068            this.renderDistanceWeight = 10.0D;
    069            this.shootingEntity = par2EntityLiving;
    070
    071            if (par2EntityLiving instanceof EntityPlayer)
    072            {
    073                this.canBePickedUp = 1;
    074            }
    075
    076            this.posY = par2EntityLiving.posY + (double)par2EntityLiving.getEyeHeight() - 0.10000000149011612D;
    077            double var6 = par3EntityLiving.posX - par2EntityLiving.posX;
    078            double var8 = par3EntityLiving.posY + (double)par3EntityLiving.getEyeHeight() - 0.699999988079071D - this.posY;
    079            double var10 = par3EntityLiving.posZ - par2EntityLiving.posZ;
    080            double var12 = (double)MathHelper.sqrt_double(var6 * var6 + var10 * var10);
    081
    082            if (var12 >= 1.0E-7D)
    083            {
    084                float var14 = (float)(Math.atan2(var10, var6) * 180.0D / Math.PI) - 90.0F;
    085                float var15 = (float)(-(Math.atan2(var8, var12) * 180.0D / Math.PI));
    086                double var16 = var6 / var12;
    087                double var18 = var10 / var12;
    088                this.setLocationAndAngles(par2EntityLiving.posX + var16, this.posY, par2EntityLiving.posZ + var18, var14, var15);
    089                this.yOffset = 0.0F;
    090                float var20 = (float)var12 * 0.2F;
    091                this.setThrowableHeading(var6, var8 + (double)var20, var10, par4, par5);
    092            }
    093        }
    094
    095        public EntityArrow(World par1World, EntityLiving par2EntityLiving, float par3)
    096        {
    097            super(par1World);
    098            this.renderDistanceWeight = 10.0D;
    099            this.shootingEntity = par2EntityLiving;
    100
    101            if (par2EntityLiving instanceof EntityPlayer)
    102            {
    103                this.canBePickedUp = 1;
    104            }
    105
    106            this.setSize(0.5F, 0.5F);
    107            this.setLocationAndAngles(par2EntityLiving.posX, par2EntityLiving.posY + (double)par2EntityLiving.getEyeHeight(), par2EntityLiving.posZ, par2EntityLiving.rotationYaw, par2EntityLiving.rotationPitch);
    108            this.posX -= (double)(MathHelper.cos(this.rotationYaw / 180.0F * (float)Math.PI) * 0.16F);
    109            this.posY -= 0.10000000149011612D;
    110            this.posZ -= (double)(MathHelper.sin(this.rotationYaw / 180.0F * (float)Math.PI) * 0.16F);
    111            this.setPosition(this.posX, this.posY, this.posZ);
    112            this.yOffset = 0.0F;
    113            this.motionX = (double)(-MathHelper.sin(this.rotationYaw / 180.0F * (float)Math.PI) * MathHelper.cos(this.rotationPitch / 180.0F * (float)Math.PI));
    114            this.motionZ = (double)(MathHelper.cos(this.rotationYaw / 180.0F * (float)Math.PI) * MathHelper.cos(this.rotationPitch / 180.0F * (float)Math.PI));
    115            this.motionY = (double)(-MathHelper.sin(this.rotationPitch / 180.0F * (float)Math.PI));
    116            this.setThrowableHeading(this.motionX, this.motionY, this.motionZ, par3 * 1.5F, 1.0F);
    117        }
    118
    119        protected void entityInit()
    120        {
    121            this.dataWatcher.addObject(16, Byte.valueOf((byte)0));
    122        }
    123
    124        /**
    125         * Similar to setArrowHeading, it's point the throwable entity to a x, y, z direction.
    126         */
    127        public void setThrowableHeading(double par1, double par3, double par5, float par7, float par8)
    128        {
    129            float var9 = MathHelper.sqrt_double(par1 * par1 + par3 * par3 + par5 * par5);
    130            par1 /= (double)var9;
    131            par3 /= (double)var9;
    132            par5 /= (double)var9;
    133            par1 += this.rand.nextGaussian() * 0.007499999832361937D * (double)par8;
    134            par3 += this.rand.nextGaussian() * 0.007499999832361937D * (double)par8;
    135            par5 += this.rand.nextGaussian() * 0.007499999832361937D * (double)par8;
    136            par1 *= (double)par7;
    137            par3 *= (double)par7;
    138            par5 *= (double)par7;
    139            this.motionX = par1;
    140            this.motionY = par3;
    141            this.motionZ = par5;
    142            float var10 = MathHelper.sqrt_double(par1 * par1 + par5 * par5);
    143            this.prevRotationYaw = this.rotationYaw = (float)(Math.atan2(par1, par5) * 180.0D / Math.PI);
    144            this.prevRotationPitch = this.rotationPitch = (float)(Math.atan2(par3, (double)var10) * 180.0D / Math.PI);
    145            this.ticksInGround = 0;
    146        }
    147
    148        @SideOnly(Side.CLIENT)
    149
    150        /**
    151         * Sets the position and rotation. Only difference from the other one is no bounding on the rotation. Args: posX,
    152         * posY, posZ, yaw, pitch
    153         */
    154        public void setPositionAndRotation2(double par1, double par3, double par5, float par7, float par8, int par9)
    155        {
    156            this.setPosition(par1, par3, par5);
    157            this.setRotation(par7, par8);
    158        }
    159
    160        @SideOnly(Side.CLIENT)
    161
    162        /**
    163         * Sets the velocity to the args. Args: x, y, z
    164         */
    165        public void setVelocity(double par1, double par3, double par5)
    166        {
    167            this.motionX = par1;
    168            this.motionY = par3;
    169            this.motionZ = par5;
    170
    171            if (this.prevRotationPitch == 0.0F && this.prevRotationYaw == 0.0F)
    172            {
    173                float var7 = MathHelper.sqrt_double(par1 * par1 + par5 * par5);
    174                this.prevRotationYaw = this.rotationYaw = (float)(Math.atan2(par1, par5) * 180.0D / Math.PI);
    175                this.prevRotationPitch = this.rotationPitch = (float)(Math.atan2(par3, (double)var7) * 180.0D / Math.PI);
    176                this.prevRotationPitch = this.rotationPitch;
    177                this.prevRotationYaw = this.rotationYaw;
    178                this.setLocationAndAngles(this.posX, this.posY, this.posZ, this.rotationYaw, this.rotationPitch);
    179                this.ticksInGround = 0;
    180            }
    181        }
    182
    183        /**
    184         * Called to update the entity's position/logic.
    185         */
    186        public void onUpdate()
    187        {
    188            super.onUpdate();
    189
    190            if (this.prevRotationPitch == 0.0F && this.prevRotationYaw == 0.0F)
    191            {
    192                float var1 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionZ * this.motionZ);
    193                this.prevRotationYaw = this.rotationYaw = (float)(Math.atan2(this.motionX, this.motionZ) * 180.0D / Math.PI);
    194                this.prevRotationPitch = this.rotationPitch = (float)(Math.atan2(this.motionY, (double)var1) * 180.0D / Math.PI);
    195            }
    196
    197            int var16 = this.worldObj.getBlockId(this.xTile, this.yTile, this.zTile);
    198
    199            if (var16 > 0)
    200            {
    201                Block.blocksList[var16].setBlockBoundsBasedOnState(this.worldObj, this.xTile, this.yTile, this.zTile);
    202                AxisAlignedBB var2 = Block.blocksList[var16].getCollisionBoundingBoxFromPool(this.worldObj, this.xTile, this.yTile, this.zTile);
    203
    204                if (var2 != null && var2.isVecInside(this.worldObj.getWorldVec3Pool().getVecFromPool(this.posX, this.posY, this.posZ)))
    205                {
    206                    this.inGround = true;
    207                }
    208            }
    209
    210            if (this.arrowShake > 0)
    211            {
    212                --this.arrowShake;
    213            }
    214
    215            if (this.inGround)
    216            {
    217                int var18 = this.worldObj.getBlockId(this.xTile, this.yTile, this.zTile);
    218                int var19 = this.worldObj.getBlockMetadata(this.xTile, this.yTile, this.zTile);
    219
    220                if (var18 == this.inTile && var19 == this.inData)
    221                {
    222                    ++this.ticksInGround;
    223
    224                    if (this.ticksInGround == 1200)
    225                    {
    226                        this.setDead();
    227                    }
    228                }
    229                else
    230                {
    231                    this.inGround = false;
    232                    this.motionX *= (double)(this.rand.nextFloat() * 0.2F);
    233                    this.motionY *= (double)(this.rand.nextFloat() * 0.2F);
    234                    this.motionZ *= (double)(this.rand.nextFloat() * 0.2F);
    235                    this.ticksInGround = 0;
    236                    this.ticksInAir = 0;
    237                }
    238            }
    239            else
    240            {
    241                ++this.ticksInAir;
    242                Vec3 var17 = this.worldObj.getWorldVec3Pool().getVecFromPool(this.posX, this.posY, this.posZ);
    243                Vec3 var3 = this.worldObj.getWorldVec3Pool().getVecFromPool(this.posX + this.motionX, this.posY + this.motionY, this.posZ + this.motionZ);
    244                MovingObjectPosition var4 = this.worldObj.rayTraceBlocks_do_do(var17, var3, false, true);
    245                var17 = this.worldObj.getWorldVec3Pool().getVecFromPool(this.posX, this.posY, this.posZ);
    246                var3 = this.worldObj.getWorldVec3Pool().getVecFromPool(this.posX + this.motionX, this.posY + this.motionY, this.posZ + this.motionZ);
    247
    248                if (var4 != null)
    249                {
    250                    var3 = this.worldObj.getWorldVec3Pool().getVecFromPool(var4.hitVec.xCoord, var4.hitVec.yCoord, var4.hitVec.zCoord);
    251                }
    252
    253                Entity var5 = null;
    254                List var6 = this.worldObj.getEntitiesWithinAABBExcludingEntity(this, this.boundingBox.addCoord(this.motionX, this.motionY, this.motionZ).expand(1.0D, 1.0D, 1.0D));
    255                double var7 = 0.0D;
    256                int var9;
    257                float var11;
    258
    259                for (var9 = 0; var9 < var6.size(); ++var9)
    260                {
    261                    Entity var10 = (Entity)var6.get(var9);
    262
    263                    if (var10.canBeCollidedWith() && (var10 != this.shootingEntity || this.ticksInAir >= 5))
    264                    {
    265                        var11 = 0.3F;
    266                        AxisAlignedBB var12 = var10.boundingBox.expand((double)var11, (double)var11, (double)var11);
    267                        MovingObjectPosition var13 = var12.calculateIntercept(var17, var3);
    268
    269                        if (var13 != null)
    270                        {
    271                            double var14 = var17.distanceTo(var13.hitVec);
    272
    273                            if (var14 < var7 || var7 == 0.0D)
    274                            {
    275                                var5 = var10;
    276                                var7 = var14;
    277                            }
    278                        }
    279                    }
    280                }
    281
    282                if (var5 != null)
    283                {
    284                    var4 = new MovingObjectPosition(var5);
    285                }
    286
    287                float var20;
    288                float var26;
    289
    290                if (var4 != null)
    291                {
    292                    if (var4.entityHit != null)
    293                    {
    294                        var20 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionY * this.motionY + this.motionZ * this.motionZ);
    295                        int var23 = MathHelper.ceiling_double_int((double)var20 * this.damage);
    296
    297                        if (this.getIsCritical())
    298                        {
    299                            var23 += this.rand.nextInt(var23 / 2 + 2);
    300                        }
    301
    302                        DamageSource var21 = null;
    303
    304                        if (this.shootingEntity == null)
    305                        {
    306                            var21 = DamageSource.causeArrowDamage(this, this);
    307                        }
    308                        else
    309                        {
    310                            var21 = DamageSource.causeArrowDamage(this, this.shootingEntity);
    311                        }
    312
    313                        if (this.isBurning() && !(var4.entityHit instanceof EntityEnderman))
    314                        {
    315                            var4.entityHit.setFire(5);
    316                        }
    317
    318                        if (var4.entityHit.attackEntityFrom(var21, var23))
    319                        {
    320                            if (var4.entityHit instanceof EntityLiving)
    321                            {
    322                                EntityLiving var24 = (EntityLiving)var4.entityHit;
    323
    324                                if (!this.worldObj.isRemote)
    325                                {
    326                                    var24.setArrowCountInEntity(var24.getArrowCountInEntity() + 1);
    327                                }
    328
    329                                if (this.knockbackStrength > 0)
    330                                {
    331                                    var26 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionZ * this.motionZ);
    332
    333                                    if (var26 > 0.0F)
    334                                    {
    335                                        var4.entityHit.addVelocity(this.motionX * (double)this.knockbackStrength * 0.6000000238418579D / (double)var26, 0.1D, this.motionZ * (double)this.knockbackStrength * 0.6000000238418579D / (double)var26);
    336                                    }
    337                                }
    338
    339                                EnchantmentThorns.func_92044_a(this.shootingEntity, var24, this.rand);
    340
    341                                if (this.shootingEntity != null && var4.entityHit != this.shootingEntity && var4.entityHit instanceof EntityPlayer && this.shootingEntity instanceof EntityPlayerMP)
    342                                {
    343                                    ((EntityPlayerMP)this.shootingEntity).playerNetServerHandler.sendPacketToPlayer(new Packet70GameEvent(6, 0));
    344                                }
    345                            }
    346
    347                            this.func_85030_a("random.bowhit", 1.0F, 1.2F / (this.rand.nextFloat() * 0.2F + 0.9F));
    348
    349                            if (!(var4.entityHit instanceof EntityEnderman))
    350                            {
    351                                this.setDead();
    352                            }
    353                        }
    354                        else
    355                        {
    356                            this.motionX *= -0.10000000149011612D;
    357                            this.motionY *= -0.10000000149011612D;
    358                            this.motionZ *= -0.10000000149011612D;
    359                            this.rotationYaw += 180.0F;
    360                            this.prevRotationYaw += 180.0F;
    361                            this.ticksInAir = 0;
    362                        }
    363                    }
    364                    else
    365                    {
    366                        this.xTile = var4.blockX;
    367                        this.yTile = var4.blockY;
    368                        this.zTile = var4.blockZ;
    369                        this.inTile = this.worldObj.getBlockId(this.xTile, this.yTile, this.zTile);
    370                        this.inData = this.worldObj.getBlockMetadata(this.xTile, this.yTile, this.zTile);
    371                        this.motionX = (double)((float)(var4.hitVec.xCoord - this.posX));
    372                        this.motionY = (double)((float)(var4.hitVec.yCoord - this.posY));
    373                        this.motionZ = (double)((float)(var4.hitVec.zCoord - this.posZ));
    374                        var20 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionY * this.motionY + this.motionZ * this.motionZ);
    375                        this.posX -= this.motionX / (double)var20 * 0.05000000074505806D;
    376                        this.posY -= this.motionY / (double)var20 * 0.05000000074505806D;
    377                        this.posZ -= this.motionZ / (double)var20 * 0.05000000074505806D;
    378                        this.func_85030_a("random.bowhit", 1.0F, 1.2F / (this.rand.nextFloat() * 0.2F + 0.9F));
    379                        this.inGround = true;
    380                        this.arrowShake = 7;
    381                        this.setIsCritical(false);
    382
    383                        if (this.inTile != 0)
    384                        {
    385                            Block.blocksList[this.inTile].onEntityCollidedWithBlock(this.worldObj, this.xTile, this.yTile, this.zTile, this);
    386                        }
    387                    }
    388                }
    389
    390                if (this.getIsCritical())
    391                {
    392                    for (var9 = 0; var9 < 4; ++var9)
    393                    {
    394                        this.worldObj.spawnParticle("crit", this.posX + this.motionX * (double)var9 / 4.0D, this.posY + this.motionY * (double)var9 / 4.0D, this.posZ + this.motionZ * (double)var9 / 4.0D, -this.motionX, -this.motionY + 0.2D, -this.motionZ);
    395                    }
    396                }
    397
    398                this.posX += this.motionX;
    399                this.posY += this.motionY;
    400                this.posZ += this.motionZ;
    401                var20 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionZ * this.motionZ);
    402                this.rotationYaw = (float)(Math.atan2(this.motionX, this.motionZ) * 180.0D / Math.PI);
    403
    404                for (this.rotationPitch = (float)(Math.atan2(this.motionY, (double)var20) * 180.0D / Math.PI); this.rotationPitch - this.prevRotationPitch < -180.0F; this.prevRotationPitch -= 360.0F)
    405                {
    406                    ;
    407                }
    408
    409                while (this.rotationPitch - this.prevRotationPitch >= 180.0F)
    410                {
    411                    this.prevRotationPitch += 360.0F;
    412                }
    413
    414                while (this.rotationYaw - this.prevRotationYaw < -180.0F)
    415                {
    416                    this.prevRotationYaw -= 360.0F;
    417                }
    418
    419                while (this.rotationYaw - this.prevRotationYaw >= 180.0F)
    420                {
    421                    this.prevRotationYaw += 360.0F;
    422                }
    423
    424                this.rotationPitch = this.prevRotationPitch + (this.rotationPitch - this.prevRotationPitch) * 0.2F;
    425                this.rotationYaw = this.prevRotationYaw + (this.rotationYaw - this.prevRotationYaw) * 0.2F;
    426                float var22 = 0.99F;
    427                var11 = 0.05F;
    428
    429                if (this.isInWater())
    430                {
    431                    for (int var25 = 0; var25 < 4; ++var25)
    432                    {
    433                        var26 = 0.25F;
    434                        this.worldObj.spawnParticle("bubble", this.posX - this.motionX * (double)var26, this.posY - this.motionY * (double)var26, this.posZ - this.motionZ * (double)var26, this.motionX, this.motionY, this.motionZ);
    435                    }
    436
    437                    var22 = 0.8F;
    438                }
    439
    440                this.motionX *= (double)var22;
    441                this.motionY *= (double)var22;
    442                this.motionZ *= (double)var22;
    443                this.motionY -= (double)var11;
    444                this.setPosition(this.posX, this.posY, this.posZ);
    445                this.doBlockCollisions();
    446            }
    447        }
    448
    449        /**
    450         * (abstract) Protected helper method to write subclass entity data to NBT.
    451         */
    452        public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
    453        {
    454            par1NBTTagCompound.setShort("xTile", (short)this.xTile);
    455            par1NBTTagCompound.setShort("yTile", (short)this.yTile);
    456            par1NBTTagCompound.setShort("zTile", (short)this.zTile);
    457            par1NBTTagCompound.setByte("inTile", (byte)this.inTile);
    458            par1NBTTagCompound.setByte("inData", (byte)this.inData);
    459            par1NBTTagCompound.setByte("shake", (byte)this.arrowShake);
    460            par1NBTTagCompound.setByte("inGround", (byte)(this.inGround ? 1 : 0));
    461            par1NBTTagCompound.setByte("pickup", (byte)this.canBePickedUp);
    462            par1NBTTagCompound.setDouble("damage", this.damage);
    463        }
    464
    465        /**
    466         * (abstract) Protected helper method to read subclass entity data from NBT.
    467         */
    468        public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
    469        {
    470            this.xTile = par1NBTTagCompound.getShort("xTile");
    471            this.yTile = par1NBTTagCompound.getShort("yTile");
    472            this.zTile = par1NBTTagCompound.getShort("zTile");
    473            this.inTile = par1NBTTagCompound.getByte("inTile") & 255;
    474            this.inData = par1NBTTagCompound.getByte("inData") & 255;
    475            this.arrowShake = par1NBTTagCompound.getByte("shake") & 255;
    476            this.inGround = par1NBTTagCompound.getByte("inGround") == 1;
    477
    478            if (par1NBTTagCompound.hasKey("damage"))
    479            {
    480                this.damage = par1NBTTagCompound.getDouble("damage");
    481            }
    482
    483            if (par1NBTTagCompound.hasKey("pickup"))
    484            {
    485                this.canBePickedUp = par1NBTTagCompound.getByte("pickup");
    486            }
    487            else if (par1NBTTagCompound.hasKey("player"))
    488            {
    489                this.canBePickedUp = par1NBTTagCompound.getBoolean("player") ? 1 : 0;
    490            }
    491        }
    492
    493        /**
    494         * Called by a player entity when they collide with an entity
    495         */
    496        public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
    497        {
    498            if (!this.worldObj.isRemote && this.inGround && this.arrowShake <= 0)
    499            {
    500                boolean var2 = this.canBePickedUp == 1 || this.canBePickedUp == 2 && par1EntityPlayer.capabilities.isCreativeMode;
    501
    502                if (this.canBePickedUp == 1 && !par1EntityPlayer.inventory.addItemStackToInventory(new ItemStack(Item.arrow, 1)))
    503                {
    504                    var2 = false;
    505                }
    506
    507                if (var2)
    508                {
    509                    this.func_85030_a("random.pop", 0.2F, ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.7F + 1.0F) * 2.0F);
    510                    par1EntityPlayer.onItemPickup(this, 1);
    511                    this.setDead();
    512                }
    513            }
    514        }
    515
    516        /**
    517         * returns if this entity triggers Block.onEntityWalking on the blocks they walk on. used for spiders and wolves to
    518         * prevent them from trampling crops
    519         */
    520        protected boolean canTriggerWalking()
    521        {
    522            return false;
    523        }
    524
    525        @SideOnly(Side.CLIENT)
    526        public float getShadowSize()
    527        {
    528            return 0.0F;
    529        }
    530
    531        public void setDamage(double par1)
    532        {
    533            this.damage = par1;
    534        }
    535
    536        public double getDamage()
    537        {
    538            return this.damage;
    539        }
    540
    541        /**
    542         * Sets the amount of knockback the arrow applies when it hits a mob.
    543         */
    544        public void setKnockbackStrength(int par1)
    545        {
    546            this.knockbackStrength = par1;
    547        }
    548
    549        /**
    550         * If returns false, the item will not inflict any damage against entities.
    551         */
    552        public boolean canAttackWithItem()
    553        {
    554            return false;
    555        }
    556
    557        /**
    558         * Whether the arrow has a stream of critical hit particles flying behind it.
    559         */
    560        public void setIsCritical(boolean par1)
    561        {
    562            byte var2 = this.dataWatcher.getWatchableObjectByte(16);
    563
    564            if (par1)
    565            {
    566                this.dataWatcher.updateObject(16, Byte.valueOf((byte)(var2 | 1)));
    567            }
    568            else
    569            {
    570                this.dataWatcher.updateObject(16, Byte.valueOf((byte)(var2 & -2)));
    571            }
    572        }
    573
    574        /**
    575         * Whether the arrow has a stream of critical hit particles flying behind it.
    576         */
    577        public boolean getIsCritical()
    578        {
    579            byte var1 = this.dataWatcher.getWatchableObjectByte(16);
    580            return (var1 & 1) != 0;
    581        }
    582    }