content: package net.minecraft.entity.item;
  
  import net.minecraft.entity.Entity;
  import net.minecraft.init.Items;
  import net.minecraft.item.ItemStack;
  import net.minecraft.nbt.NBTTagCompound;
  import net.minecraft.util.BlockPos;
  import net.minecraft.util.EnumParticleTypes;
  import net.minecraft.util.MathHelper;
  import net.minecraft.world.World;
  
  public class EntityEnderEye extends Entity {
      private double targetX;
      private double targetY;
      private double targetZ;
      private int despawnTimer;
      private boolean shatterOrDrop;
  
      public EntityEnderEye(World worldIn) {
          super(worldIn);
          this.setSize(0.25F, 0.25F);
      }
  
      protected void entityInit() {
      }
  
      public boolean isInRangeToRenderDist(double distance) {
          double d0 = this.getEntityBoundingBox().getAverageEdgeLength() * 4.0D;
  
          if (Double.isNaN(d0)) {
              d0 = 4.0D;
          }
  
          d0 = d0 * 64.0D;
          return distance < d0 * d0;
      }
  
      public EntityEnderEye(World worldIn, double x, double y, double z) {
          super(worldIn);
          this.despawnTimer = 0;
          this.setSize(0.25F, 0.25F);
          this.setPosition(x, y, z);
      }
  
      public void moveTowards(BlockPos p_180465_1_) {
          double d0 = p_180465_1_.getX();
          int i = p_180465_1_.getY();
          double d1 = p_180465_1_.getZ();
          double d2 = d0 - this.posX;
          double d3 = d1 - this.posZ;
          float f = MathHelper.sqrt_double(d2 * d2 + d3 * d3);
  
          if (f > 12.0F) {
              this.targetX = this.posX + d2 / (double) f * 12.0D;
              this.targetZ = this.posZ + d3 / (double) f * 12.0D;
              this.targetY = this.posY + 8.0D;
          } else {
              this.targetX = d0;
              this.targetY = i;
              this.targetZ = d1;
          }
  
          this.despawnTimer = 0;
          this.shatterOrDrop = this.rand.nextInt(5) > 0;
      }
  
      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);
          }
      }
  
      public void onUpdate() {
          this.lastTickPosX = this.posX;
          this.lastTickPosY = this.posY;
          this.lastTickPosZ = this.posZ;
          super.onUpdate();
          this.posX += this.motionX;
          this.posY += this.motionY;
          this.posZ += this.motionZ;
          float f = 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, f) * 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;
  
          if (!this.worldObj.isRemote) {
              double d0 = this.targetX - this.posX;
              double d1 = this.targetZ - this.posZ;
              float f1 = (float) Math.sqrt(d0 * d0 + d1 * d1);
              float f2 = (float) MathHelper.atan2(d1, d0);
              double d2 = (double) f + (double) (f1 - f) * 0.0025D;
  
              if (f1 < 1.0F) {
                  d2 *= 0.8D;
                  this.motionY *= 0.8D;
              }
  
              this.motionX = Math.cos(f2) * d2;
              this.motionZ = Math.sin(f2) * d2;
  
              if (this.posY < this.targetY) {
                  this.motionY += (1.0D - this.motionY) * 0.014999999664723873D;
              } else {
                  this.motionY += (-1.0D - this.motionY) * 0.014999999664723873D;
              }
          }
  
          float f3 = 0.25F;
  
          if (this.isInWater()) {
              for (int i = 0; i < 4; ++i) {
                  this.worldObj.spawnParticle(EnumParticleTypes.WATER_BUBBLE, this.posX - this.motionX * (double) f3, this.posY - this.motionY * (double) f3, this.posZ - this.motionZ * (double) f3, this.motionX, this.motionY, this.motionZ);
              }
          } else {
              this.worldObj.spawnParticle(EnumParticleTypes.PORTAL, this.posX - this.motionX * (double) f3 + this.rand.nextDouble() * 0.6D - 0.3D, this.posY - this.motionY * (double) f3 - 0.5D, this.posZ - this.motionZ * (double) f3 + this.rand.nextDouble() * 0.6D - 0.3D, this.motionX, this.motionY, this.motionZ);
          }
  
          if (!this.worldObj.isRemote) {
              this.setPosition(this.posX, this.posY, this.posZ);
              ++this.despawnTimer;
  
              if (this.despawnTimer > 80 && !this.worldObj.isRemote) {
                  this.setDead();
  
                  if (this.shatterOrDrop) {
                      this.worldObj.spawnEntityInWorld(new EntityItem(this.worldObj, this.posX, this.posY, this.posZ, new ItemStack(Items.ender_eye)));
                  } else {
                      this.worldObj.playAuxSFX(2003, new BlockPos(this), 0);
                  }
              }
          }
      }
  
      public void writeEntityToNBT(NBTTagCompound tagCompound) {
      }
  
      public void readEntityFromNBT(NBTTagCompound tagCompund) {
      }
  
      public float getBrightness(float partialTicks) {
          return 1.0F;
      }
  
      public int getBrightnessForRender(float partialTicks) {
          return 15728880;
      }
  
      public boolean canAttackWithItem() {
          return false;
      }
  }
  