    001    package net.minecraft.entity.ai;
    002
    003    import net.minecraft.entity.Entity;
    004    import net.minecraft.entity.EntityLiving;
    005    import net.minecraft.util.MathHelper;
    006
    007    public class EntityLookHelper
    008    {
    009        private EntityLiving entity;
    010
    011        /**
    012         * The amount of change that is made each update for an entity facing a direction.
    013         */
    014        private float deltaLookYaw;
    015
    016        /**
    017         * The amount of change that is made each update for an entity facing a direction.
    018         */
    019        private float deltaLookPitch;
    020
    021        /** Whether or not the entity is trying to look at something. */
    022        private boolean isLooking = false;
    023        private double posX;
    024        private double posY;
    025        private double posZ;
    026
    027        public EntityLookHelper(EntityLiving par1EntityLiving)
    028        {
    029            this.entity = par1EntityLiving;
    030        }
    031
    032        /**
    033         * Sets position to look at using entity
    034         */
    035        public void setLookPositionWithEntity(Entity par1Entity, float par2, float par3)
    036        {
    037            this.posX = par1Entity.posX;
    038
    039            if (par1Entity instanceof EntityLiving)
    040            {
    041                this.posY = par1Entity.posY + (double)par1Entity.getEyeHeight();
    042            }
    043            else
    044            {
    045                this.posY = (par1Entity.boundingBox.minY + par1Entity.boundingBox.maxY) / 2.0D;
    046            }
    047
    048            this.posZ = par1Entity.posZ;
    049            this.deltaLookYaw = par2;
    050            this.deltaLookPitch = par3;
    051            this.isLooking = true;
    052        }
    053
    054        /**
    055         * Sets position to look at
    056         */
    057        public void setLookPosition(double par1, double par3, double par5, float par7, float par8)
    058        {
    059            this.posX = par1;
    060            this.posY = par3;
    061            this.posZ = par5;
    062            this.deltaLookYaw = par7;
    063            this.deltaLookPitch = par8;
    064            this.isLooking = true;
    065        }
    066
    067        /**
    068         * Updates look
    069         */
    070        public void onUpdateLook()
    071        {
    072            this.entity.rotationPitch = 0.0F;
    073
    074            if (this.isLooking)
    075            {
    076                this.isLooking = false;
    077                double var1 = this.posX - this.entity.posX;
    078                double var3 = this.posY - (this.entity.posY + (double)this.entity.getEyeHeight());
    079                double var5 = this.posZ - this.entity.posZ;
    080                double var7 = (double)MathHelper.sqrt_double(var1 * var1 + var5 * var5);
    081                float var9 = (float)(Math.atan2(var5, var1) * 180.0D / Math.PI) - 90.0F;
    082                float var10 = (float)(-(Math.atan2(var3, var7) * 180.0D / Math.PI));
    083                this.entity.rotationPitch = this.updateRotation(this.entity.rotationPitch, var10, this.deltaLookPitch);
    084                this.entity.rotationYawHead = this.updateRotation(this.entity.rotationYawHead, var9, this.deltaLookYaw);
    085            }
    086            else
    087            {
    088                this.entity.rotationYawHead = this.updateRotation(this.entity.rotationYawHead, this.entity.renderYawOffset, 10.0F);
    089            }
    090
    091            float var11 = MathHelper.wrapAngleTo180_float(this.entity.rotationYawHead - this.entity.renderYawOffset);
    092
    093            if (!this.entity.getNavigator().noPath())
    094            {
    095                if (var11 < -75.0F)
    096                {
    097                    this.entity.rotationYawHead = this.entity.renderYawOffset - 75.0F;
    098                }
    099
    100                if (var11 > 75.0F)
    101                {
    102                    this.entity.rotationYawHead = this.entity.renderYawOffset + 75.0F;
    103                }
    104            }
    105        }
    106
    107        private float updateRotation(float par1, float par2, float par3)
    108        {
    109            float var4 = MathHelper.wrapAngleTo180_float(par2 - par1);
    110
    111            if (var4 > par3)
    112            {
    113                var4 = par3;
    114            }
    115
    116            if (var4 < -par3)
    117            {
    118                var4 = -par3;
    119            }
    120
    121            return par1 + var4;
    122        }
    123    }