001    package net.minecraft.entity.ai;
002    
003    import net.minecraft.entity.EntityLiving;
004    import net.minecraft.util.MathHelper;
005    
006    public class EntityMoveHelper
007    {
008        /** The EntityLiving that is being moved */
009        private EntityLiving entity;
010        private double posX;
011        private double posY;
012        private double posZ;
013    
014        /** The speed at which the entity should move */
015        private float speed;
016        private boolean field_75643_f = false;
017    
018        public EntityMoveHelper(EntityLiving par1EntityLiving)
019        {
020            this.entity = par1EntityLiving;
021            this.posX = par1EntityLiving.posX;
022            this.posY = par1EntityLiving.posY;
023            this.posZ = par1EntityLiving.posZ;
024        }
025    
026        public boolean func_75640_a()
027        {
028            return this.field_75643_f;
029        }
030    
031        public float getSpeed()
032        {
033            return this.speed;
034        }
035    
036        /**
037         * Sets the speed and location to move to
038         */
039        public void setMoveTo(double par1, double par3, double par5, float par7)
040        {
041            this.posX = par1;
042            this.posY = par3;
043            this.posZ = par5;
044            this.speed = par7;
045            this.field_75643_f = true;
046        }
047    
048        public void onUpdateMoveHelper()
049        {
050            this.entity.setMoveForward(0.0F);
051    
052            if (this.field_75643_f)
053            {
054                this.field_75643_f = false;
055                int var1 = MathHelper.floor_double(this.entity.boundingBox.minY + 0.5D);
056                double var2 = this.posX - this.entity.posX;
057                double var4 = this.posZ - this.entity.posZ;
058                double var6 = this.posY - (double)var1;
059                double var8 = var2 * var2 + var6 * var6 + var4 * var4;
060    
061                if (var8 >= 2.500000277905201E-7D)
062                {
063                    float var10 = (float)(Math.atan2(var4, var2) * 180.0D / Math.PI) - 90.0F;
064                    this.entity.rotationYaw = this.func_75639_a(this.entity.rotationYaw, var10, 30.0F);
065                    this.entity.setAIMoveSpeed(this.speed * this.entity.getSpeedModifier());
066    
067                    if (var6 > 0.0D && var2 * var2 + var4 * var4 < 1.0D)
068                    {
069                        this.entity.getJumpHelper().setJumping();
070                    }
071                }
072            }
073        }
074    
075        private float func_75639_a(float par1, float par2, float par3)
076        {
077            float var4 = MathHelper.wrapAngleTo180_float(par2 - par1);
078    
079            if (var4 > par3)
080            {
081                var4 = par3;
082            }
083    
084            if (var4 < -par3)
085            {
086                var4 = -par3;
087            }
088    
089            return par1 + var4;
090        }
091    }