content: package net.minecraft.entity.projectile;
  
  import net.minecraft.block.Block;
  import net.minecraft.block.material.Material;
  import net.minecraft.block.state.IBlockState;
  import net.minecraft.enchantment.EnchantmentHelper;
  import net.minecraft.entity.Entity;
  import net.minecraft.entity.EntityLivingBase;
  import net.minecraft.entity.IProjectile;
  import net.minecraft.entity.monster.EntityEnderman;
  import net.minecraft.entity.player.EntityPlayer;
  import net.minecraft.entity.player.EntityPlayerMP;
  import net.minecraft.init.Items;
  import net.minecraft.item.ItemStack;
  import net.minecraft.nbt.NBTTagCompound;
  import net.minecraft.network.play.server.S2BPacketChangeGameState;
  import net.minecraft.util.*;
  import net.minecraft.world.World;
  
  import java.util.List;
  
  public class EntityArrow extends Entity implements IProjectile {
      private int xTile = -1;
      private int yTile = -1;
      private int zTile = -1;
      private Block inTile;
      private int inData;
      public boolean inGround;
      public int canBePickedUp;
      public int arrowShake;
      public Entity shootingEntity;
      private int ticksInGround;
      private int ticksInAir;
      private double damage = 2.0D;
      private int knockbackStrength;
  
      public EntityArrow(World worldIn) {
          super(worldIn);
          this.renderDistanceWeight = 10.0D;
          this.setSize(0.5F, 0.5F);
      }
  
      public EntityArrow(World worldIn, double x, double y, double z) {
          super(worldIn);
          this.renderDistanceWeight = 10.0D;
          this.setSize(0.5F, 0.5F);
          this.setPosition(x, y, z);
      }
  
      public EntityArrow(World worldIn, EntityLivingBase shooter, EntityLivingBase target, float velocity, float innacuracy) {
          super(worldIn);
          this.renderDistanceWeight = 10.0D;
          this.shootingEntity = shooter;
  
          if (shooter instanceof EntityPlayer) {
              this.canBePickedUp = 1;
          }
  
          this.posY = shooter.posY + (double) shooter.getEyeHeight() - 0.10000000149011612D;
          double d0 = target.posX - shooter.posX;
          double d1 = target.getEntityBoundingBox().minY + (double) (target.height / 3.0F) - this.posY;
          double d2 = target.posZ - shooter.posZ;
          double d3 = MathHelper.sqrt_double(d0 * d0 + d2 * d2);
  
          if (d3 >= 1.0E-7D) {
              float f = (float) (MathHelper.atan2(d2, d0) * 180.0D / Math.PI) - 90.0F;
              float f1 = (float) (-(MathHelper.atan2(d1, d3) * 180.0D / Math.PI));
              double d4 = d0 / d3;
              double d5 = d2 / d3;
              this.setLocationAndAngles(shooter.posX + d4, this.posY, shooter.posZ + d5, f, f1);
              float f2 = (float) (d3 * 0.20000000298023224D);
              this.setThrowableHeading(d0, d1 + (double) f2, d2, velocity, innacuracy);
          }
      }
  
      public EntityArrow(World worldIn, EntityLivingBase shooter, float velocity) {
          super(worldIn);
          this.renderDistanceWeight = 10.0D;
          this.shootingEntity = shooter;
  
          if (shooter instanceof EntityPlayer) {
              this.canBePickedUp = 1;
          }
  
          this.setSize(0.5F, 0.5F);
          this.setLocationAndAngles(shooter.posX, shooter.posY + (double) shooter.getEyeHeight(), shooter.posZ, shooter.rotationYaw, shooter.rotationPitch);
          this.posX -= MathHelper.cos(this.rotationYaw / 180.0F * (float) Math.PI) * 0.16F;
          this.posY -= 0.10000000149011612D;
          this.posZ -= MathHelper.sin(this.rotationYaw / 180.0F * (float) Math.PI) * 0.16F;
          this.setPosition(this.posX, this.posY, this.posZ);
          this.motionX = -MathHelper.sin(this.rotationYaw / 180.0F * (float) Math.PI) * MathHelper.cos(this.rotationPitch / 180.0F * (float) Math.PI);
          this.motionZ = MathHelper.cos(this.rotationYaw / 180.0F * (float) Math.PI) * MathHelper.cos(this.rotationPitch / 180.0F * (float) Math.PI);
          this.motionY = -MathHelper.sin(this.rotationPitch / 180.0F * (float) Math.PI);
          this.setThrowableHeading(this.motionX, this.motionY, this.motionZ, velocity * 1.5F, 1.0F);
      }
  
      protected void entityInit() {
          this.dataWatcher.addObject(16, Byte.valueOf((byte) 0));
      }
  
      public void setThrowableHeading(double x, double y, double z, float velocity, float inaccuracy) {
          float f = MathHelper.sqrt_double(x * x + y * y + z * z);
          x = x / (double) f;
          y = y / (double) f;
          z = z / (double) f;
          x = x + this.rand.nextGaussian() * (double) (this.rand.nextBoolean() ? -1 : 1) * 0.007499999832361937D * (double) inaccuracy;
          y = y + this.rand.nextGaussian() * (double) (this.rand.nextBoolean() ? -1 : 1) * 0.007499999832361937D * (double) inaccuracy;
          z = z + this.rand.nextGaussian() * (double) (this.rand.nextBoolean() ? -1 : 1) * 0.007499999832361937D * (double) inaccuracy;
          x = x * (double) velocity;
          y = y * (double) velocity;
          z = z * (double) velocity;
          this.motionX = x;
          this.motionY = y;
          this.motionZ = z;
          float f1 = MathHelper.sqrt_double(x * x + z * z);
          this.prevRotationYaw = this.rotationYaw = (float) (MathHelper.atan2(x, z) * 180.0D / Math.PI);
          this.prevRotationPitch = this.rotationPitch = (float) (MathHelper.atan2(y, f1) * 180.0D / Math.PI);
          this.ticksInGround = 0;
      }
  
      public void setPositionAndRotation2(double x, double y, double z, float yaw, float pitch, int posRotationIncrements, boolean p_180426_10_) {
          this.setPosition(x, y, z);
          this.setRotation(yaw, pitch);
      }
  
      public void setVelocity(double x, double y, double z) {
          this.motionX = x;
          this.motionY = y;
          this.motionZ = z;
  
          if (this.prevRotationPitch == 0.0F && this.prevRotationYaw == 0.0F) {
              float f = MathHelper.sqrt_double(x * x + z * z);
              this.prevRotationYaw = this.rotationYaw = (float) (MathHelper.atan2(x, z) * 180.0D / Math.PI);
              this.prevRotationPitch = this.rotationPitch = (float) (MathHelper.atan2(y, f) * 180.0D / Math.PI);
              this.prevRotationPitch = this.rotationPitch;
              this.prevRotationYaw = this.rotationYaw;
              this.setLocationAndAngles(this.posX, this.posY, this.posZ, this.rotationYaw, this.rotationPitch);
              this.ticksInGround = 0;
          }
      }
  
      public void onUpdate() {
          super.onUpdate();
  
          if (this.prevRotationPitch == 0.0F && this.prevRotationYaw == 0.0F) {
              float f = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionZ * this.motionZ);
              this.prevRotationYaw = this.rotationYaw = (float) (MathHelper.atan2(this.motionX, this.motionZ) * 180.0D / Math.PI);
              this.prevRotationPitch = this.rotationPitch = (float) (MathHelper.atan2(this.motionY, f) * 180.0D / Math.PI);
          }
  
          BlockPos blockpos = new BlockPos(this.xTile, this.yTile, this.zTile);
          IBlockState iblockstate = this.worldObj.getBlockState(blockpos);
          Block block = iblockstate.getBlock();
  
          if (block.getMaterial() != Material.air) {
              block.setBlockBoundsBasedOnState(this.worldObj, blockpos);
              AxisAlignedBB axisalignedbb = block.getCollisionBoundingBox(this.worldObj, blockpos, iblockstate);
  
              if (axisalignedbb != null && axisalignedbb.isVecInside(new Vec3(this.posX, this.posY, this.posZ))) {
                  this.inGround = true;
              }
          }
  
          if (this.arrowShake > 0) {
              --this.arrowShake;
          }
  
          if (this.inGround) {
              int j = block.getMetaFromState(iblockstate);
  
              if (block == this.inTile && j == this.inData) {
                  ++this.ticksInGround;
  
                  if (this.ticksInGround >= 1200) {
                      this.setDead();
                  }
              } else {
                  this.inGround = false;
                  this.motionX *= this.rand.nextFloat() * 0.2F;
                  this.motionY *= this.rand.nextFloat() * 0.2F;
                  this.motionZ *= this.rand.nextFloat() * 0.2F;
                  this.ticksInGround = 0;
                  this.ticksInAir = 0;
              }
          } else {
              ++this.ticksInAir;
              Vec3 vec31 = new Vec3(this.posX, this.posY, this.posZ);
              Vec3 vec3 = new Vec3(this.posX + this.motionX, this.posY + this.motionY, this.posZ + this.motionZ);
              MovingObjectPosition movingobjectposition = this.worldObj.rayTraceBlocks(vec31, vec3, false, true, false);
              vec31 = new Vec3(this.posX, this.posY, this.posZ);
              vec3 = new Vec3(this.posX + this.motionX, this.posY + this.motionY, this.posZ + this.motionZ);
  
              if (movingobjectposition != null) {
                  vec3 = new Vec3(movingobjectposition.hitVec.xCoord, movingobjectposition.hitVec.yCoord, movingobjectposition.hitVec.zCoord);
              }
  
              Entity entity = null;
              List<Entity> list = this.worldObj.getEntitiesWithinAABBExcludingEntity(this, this.getEntityBoundingBox().addCoord(this.motionX, this.motionY, this.motionZ).expand(1.0D, 1.0D, 1.0D));
              double d0 = 0.0D;
  
              for (int i = 0; i < list.size(); ++i) {
                  Entity entity1 = list.get(i);
  
                  if (entity1.canBeCollidedWith() && (entity1 != this.shootingEntity || this.ticksInAir >= 5)) {
                      float f1 = 0.3F;
                      AxisAlignedBB axisalignedbb1 = entity1.getEntityBoundingBox().expand(f1, f1, f1);
                      MovingObjectPosition movingobjectposition1 = axisalignedbb1.calculateIntercept(vec31, vec3);
  
                      if (movingobjectposition1 != null) {
                          double d1 = vec31.squareDistanceTo(movingobjectposition1.hitVec);
  
                          if (d1 < d0 || d0 == 0.0D) {
                              entity = entity1;
                              d0 = d1;
                          }
                      }
                  }
              }
  
              if (entity != null) {
                  movingobjectposition = new MovingObjectPosition(entity);
              }
  
              if (movingobjectposition != null && movingobjectposition.entityHit != null && movingobjectposition.entityHit instanceof EntityPlayer) {
                  EntityPlayer entityplayer = (EntityPlayer) movingobjectposition.entityHit;
  
                  if (entityplayer.capabilities.disableDamage || this.shootingEntity instanceof EntityPlayer && !((EntityPlayer) this.shootingEntity).canAttackPlayer(entityplayer)) {
                      movingobjectposition = null;
                  }
              }
  
              if (movingobjectposition != null) {
                  if (movingobjectposition.entityHit != null) {
                      float f2 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionY * this.motionY + this.motionZ * this.motionZ);
                      int l = MathHelper.ceiling_double_int((double) f2 * this.damage);
  
                      if (this.getIsCritical()) {
                          l += this.rand.nextInt(l / 2 + 2);
                      }
  
                      DamageSource damagesource;
  
                      if (this.shootingEntity == null) {
                          damagesource = DamageSource.causeArrowDamage(this, this);
                      } else {
                          damagesource = DamageSource.causeArrowDamage(this, this.shootingEntity);
                      }
  
                      if (this.isBurning() && !(movingobjectposition.entityHit instanceof EntityEnderman)) {
                          movingobjectposition.entityHit.setFire(5);
                      }
  
                      if (movingobjectposition.entityHit.attackEntityFrom(damagesource, (float) l)) {
                          if (movingobjectposition.entityHit instanceof EntityLivingBase) {
                              EntityLivingBase entitylivingbase = (EntityLivingBase) movingobjectposition.entityHit;
  
                              if (!this.worldObj.isRemote) {
                                  entitylivingbase.setArrowCountInEntity(entitylivingbase.getArrowCountInEntity() + 1);
                              }
  
                              if (this.knockbackStrength > 0) {
                                  float f7 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionZ * this.motionZ);
  
                                  if (f7 > 0.0F) {
                                      movingobjectposition.entityHit.addVelocity(this.motionX * (double) this.knockbackStrength * 0.6000000238418579D / (double) f7, 0.1D, this.motionZ * (double) this.knockbackStrength * 0.6000000238418579D / (double) f7);
                                  }
                              }
  
                              if (this.shootingEntity instanceof EntityLivingBase) {
                                  EnchantmentHelper.applyThornEnchantments(entitylivingbase, this.shootingEntity);
                                  EnchantmentHelper.applyArthropodEnchantments((EntityLivingBase) this.shootingEntity, entitylivingbase);
                              }
  
                              if (this.shootingEntity != null && movingobjectposition.entityHit != this.shootingEntity && movingobjectposition.entityHit instanceof EntityPlayer && this.shootingEntity instanceof EntityPlayerMP) {
                                  ((EntityPlayerMP) this.shootingEntity).playerNetServerHandler.sendPacket(new S2BPacketChangeGameState(6, 0.0F));
                              }
                          }
  
                          this.playSound("random.bowhit", 1.0F, 1.2F / (this.rand.nextFloat() * 0.2F + 0.9F));
  
                          if (!(movingobjectposition.entityHit instanceof EntityEnderman)) {
                              this.setDead();
                          }
                      } else {
                          this.motionX *= -0.10000000149011612D;
                          this.motionY *= -0.10000000149011612D;
                          this.motionZ *= -0.10000000149011612D;
                          this.rotationYaw += 180.0F;
                          this.prevRotationYaw += 180.0F;
                          this.ticksInAir = 0;
                      }
                  } else {
                      BlockPos blockpos1 = movingobjectposition.getBlockPos();
                      this.xTile = blockpos1.getX();
                      this.yTile = blockpos1.getY();
                      this.zTile = blockpos1.getZ();
                      IBlockState iblockstate1 = this.worldObj.getBlockState(blockpos1);
                      this.inTile = iblockstate1.getBlock();
                      this.inData = this.inTile.getMetaFromState(iblockstate1);
                      this.motionX = (float) (movingobjectposition.hitVec.xCoord - this.posX);
                      this.motionY = (float) (movingobjectposition.hitVec.yCoord - this.posY);
                      this.motionZ = (float) (movingobjectposition.hitVec.zCoord - this.posZ);
                      float f5 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionY * this.motionY + this.motionZ * this.motionZ);
                      this.posX -= this.motionX / (double) f5 * 0.05000000074505806D;
                      this.posY -= this.motionY / (double) f5 * 0.05000000074505806D;
                      this.posZ -= this.motionZ / (double) f5 * 0.05000000074505806D;
                      this.playSound("random.bowhit", 1.0F, 1.2F / (this.rand.nextFloat() * 0.2F + 0.9F));
                      this.inGround = true;
                      this.arrowShake = 7;
                      this.setIsCritical(false);
  
                      if (this.inTile.getMaterial() != Material.air) {
                          this.inTile.onEntityCollidedWithBlock(this.worldObj, blockpos1, iblockstate1, this);
                      }
                  }
              }
  
              if (this.getIsCritical()) {
                  for (int k = 0; k < 4; ++k) {
                      this.worldObj.spawnParticle(EnumParticleTypes.CRIT, this.posX + this.motionX * (double) k / 4.0D, this.posY + this.motionY * (double) k / 4.0D, this.posZ + this.motionZ * (double) k / 4.0D, -this.motionX, -this.motionY + 0.2D, -this.motionZ);
                  }
              }
  
              this.posX += this.motionX;
              this.posY += this.motionY;
              this.posZ += this.motionZ;
              float f3 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionZ * this.motionZ);
              this.rotationYaw = (float) (MathHelper.atan2(this.motionX, this.motionZ) * 180.0D / Math.PI);
  
              for (this.rotationPitch = (float) (MathHelper.atan2(this.motionY, f3) * 180.0D / Math.PI); this.rotationPitch - this.prevRotationPitch < -180.0F; this.prevRotationPitch -= 360.0F) {
              }
  
              while (this.rotationPitch - this.prevRotationPitch >= 180.0F) {
                  this.prevRotationPitch += 360.0F;
              }
  
              while (this.rotationYaw - this.prevRotationYaw < -180.0F) {
                  this.prevRotationYaw -= 360.0F;
              }
  
              while (this.rotationYaw - this.prevRotationYaw >= 180.0F) {
                  this.prevRotationYaw += 360.0F;
              }
  
              this.rotationPitch = this.prevRotationPitch + (this.rotationPitch - this.prevRotationPitch) * 0.2F;
              this.rotationYaw = this.prevRotationYaw + (this.rotationYaw - this.prevRotationYaw) * 0.2F;
              float f4 = 0.99F;
              float f6 = 0.05F;
  
              if (this.isInWater()) {
                  for (int i1 = 0; i1 < 4; ++i1) {
                      float f8 = 0.25F;
                      this.worldObj.spawnParticle(EnumParticleTypes.WATER_BUBBLE, this.posX - this.motionX * (double) f8, this.posY - this.motionY * (double) f8, this.posZ - this.motionZ * (double) f8, this.motionX, this.motionY, this.motionZ);
                  }
  
                  f4 = 0.6F;
              }
  
              if (this.isWet()) {
                  this.extinguish();
              }
  
              this.motionX *= f4;
              this.motionY *= f4;
              this.motionZ *= f4;
              this.motionY -= f6;
              this.setPosition(this.posX, this.posY, this.posZ);
              this.doBlockCollisions();
          }
      }
  
      public void writeEntityToNBT(NBTTagCompound tagCompound) {
          tagCompound.setShort("xTile", (short) this.xTile);
          tagCompound.setShort("yTile", (short) this.yTile);
          tagCompound.setShort("zTile", (short) this.zTile);
          tagCompound.setShort("life", (short) this.ticksInGround);
          ResourceLocation resourcelocation = Block.blockRegistry.getNameForObject(this.inTile);
          tagCompound.setString("inTile", resourcelocation == null ? "" : resourcelocation.toString());
          tagCompound.setByte("inData", (byte) this.inData);
          tagCompound.setByte("shake", (byte) this.arrowShake);
          tagCompound.setByte("inGround", (byte) (this.inGround ? 1 : 0));
          tagCompound.setByte("pickup", (byte) this.canBePickedUp);
          tagCompound.setDouble("damage", this.damage);
      }
  
      public void readEntityFromNBT(NBTTagCompound tagCompund) {
          this.xTile = tagCompund.getShort("xTile");
          this.yTile = tagCompund.getShort("yTile");
          this.zTile = tagCompund.getShort("zTile");
          this.ticksInGround = tagCompund.getShort("life");
  
          if (tagCompund.hasKey("inTile", 8)) {
              this.inTile = Block.getBlockFromName(tagCompund.getString("inTile"));
          } else {
              this.inTile = Block.getBlockById(tagCompund.getByte("inTile") & 255);
          }
  
          this.inData = tagCompund.getByte("inData") & 255;
          this.arrowShake = tagCompund.getByte("shake") & 255;
          this.inGround = tagCompund.getByte("inGround") == 1;
  
          if (tagCompund.hasKey("damage", 99)) {
              this.damage = tagCompund.getDouble("damage");
          }
  
          if (tagCompund.hasKey("pickup", 99)) {
              this.canBePickedUp = tagCompund.getByte("pickup");
          } else if (tagCompund.hasKey("player", 99)) {
              this.canBePickedUp = tagCompund.getBoolean("player") ? 1 : 0;
          }
      }
  
      public void onCollideWithPlayer(EntityPlayer entityIn) {
          if (!this.worldObj.isRemote && this.inGround && this.arrowShake <= 0) {
              boolean flag = this.canBePickedUp == 1 || this.canBePickedUp == 2 && entityIn.capabilities.isCreativeMode;
  
              if (this.canBePickedUp == 1 && !entityIn.inventory.addItemStackToInventory(new ItemStack(Items.arrow, 1))) {
                  flag = false;
              }
  
              if (flag) {
                  this.playSound("random.pop", 0.2F, ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.7F + 1.0F) * 2.0F);
                  entityIn.onItemPickup(this, 1);
                  this.setDead();
              }
          }
      }
  
      protected boolean canTriggerWalking() {
          return false;
      }
  
      public void setDamage(double damageIn) {
          this.damage = damageIn;
      }
  
      public double getDamage() {
          return this.damage;
      }
  
      public void setKnockbackStrength(int knockbackStrengthIn) {
          this.knockbackStrength = knockbackStrengthIn;
      }
  
      public boolean canAttackWithItem() {
          return false;
      }
  
      public float getEyeHeight() {
          return 0.0F;
      }
  
      public void setIsCritical(boolean critical) {
          byte b0 = this.dataWatcher.getWatchableObjectByte(16);
  
          if (critical) {
              this.dataWatcher.updateObject(16, Byte.valueOf((byte) (b0 | 1)));
          } else {
              this.dataWatcher.updateObject(16, Byte.valueOf((byte) (b0 & -2)));
          }
      }
  
      public boolean getIsCritical() {
          byte b0 = this.dataWatcher.getWatchableObjectByte(16);
          return (b0 & 1) != 0;
      }
  }
  