001    package net.minecraft.entity.ai;
002    
003    import net.minecraft.entity.Entity;
004    import net.minecraft.entity.EntityLiving;
005    import net.minecraft.entity.player.EntityPlayer;
006    
007    public class EntityAIWatchClosest extends EntityAIBase
008    {
009        private EntityLiving theWatcher;
010    
011        /** The closest entity which is being watched by this one. */
012        protected Entity closestEntity;
013        private float field_75333_c;
014        private int lookTime;
015        private float field_75331_e;
016        private Class watchedClass;
017    
018        public EntityAIWatchClosest(EntityLiving par1EntityLiving, Class par2Class, float par3)
019        {
020            this.theWatcher = par1EntityLiving;
021            this.watchedClass = par2Class;
022            this.field_75333_c = par3;
023            this.field_75331_e = 0.02F;
024            this.setMutexBits(2);
025        }
026    
027        public EntityAIWatchClosest(EntityLiving par1EntityLiving, Class par2Class, float par3, float par4)
028        {
029            this.theWatcher = par1EntityLiving;
030            this.watchedClass = par2Class;
031            this.field_75333_c = par3;
032            this.field_75331_e = par4;
033            this.setMutexBits(2);
034        }
035    
036        /**
037         * Returns whether the EntityAIBase should begin execution.
038         */
039        public boolean shouldExecute()
040        {
041            if (this.theWatcher.getRNG().nextFloat() >= this.field_75331_e)
042            {
043                return false;
044            }
045            else
046            {
047                if (this.watchedClass == EntityPlayer.class)
048                {
049                    this.closestEntity = this.theWatcher.worldObj.getClosestPlayerToEntity(this.theWatcher, (double)this.field_75333_c);
050                }
051                else
052                {
053                    this.closestEntity = this.theWatcher.worldObj.findNearestEntityWithinAABB(this.watchedClass, this.theWatcher.boundingBox.expand((double)this.field_75333_c, 3.0D, (double)this.field_75333_c), this.theWatcher);
054                }
055    
056                return this.closestEntity != null;
057            }
058        }
059    
060        /**
061         * Returns whether an in-progress EntityAIBase should continue executing
062         */
063        public boolean continueExecuting()
064        {
065            return !this.closestEntity.isEntityAlive() ? false : (this.theWatcher.getDistanceSqToEntity(this.closestEntity) > (double)(this.field_75333_c * this.field_75333_c) ? false : this.lookTime > 0);
066        }
067    
068        /**
069         * Execute a one shot task or start executing a continuous task
070         */
071        public void startExecuting()
072        {
073            this.lookTime = 40 + this.theWatcher.getRNG().nextInt(40);
074        }
075    
076        /**
077         * Resets the task
078         */
079        public void resetTask()
080        {
081            this.closestEntity = null;
082        }
083    
084        /**
085         * Updates the task
086         */
087        public void updateTask()
088        {
089            this.theWatcher.getLookHelper().setLookPosition(this.closestEntity.posX, this.closestEntity.posY + (double)this.closestEntity.getEyeHeight(), this.closestEntity.posZ, 10.0F, (float)this.theWatcher.getVerticalFaceSpeed());
090            --this.lookTime;
091        }
092    }