    001package net.minecraft.tileentity;
    002
    003import java.util.Random;
    004import net.minecraft.entity.player.EntityPlayer;
    005
    006public class TileEntityEnchantmentTable extends TileEntity
    007{
    008    /** Used by the render to make the book 'bounce' */
    009    public int tickCount;
    010
    011    /** Value used for determining how the page flip should look. */
    012    public float pageFlip;
    013
    014    /** The last tick's pageFlip value. */
    015    public float pageFlipPrev;
    016    public float field_70373_d;
    017    public float field_70374_e;
    018
    019    /** The amount that the book is open. */
    020    public float bookSpread;
    021
    022    /** The amount that the book is open. */
    023    public float bookSpreadPrev;
    024    public float bookRotation2;
    025    public float bookRotationPrev;
    026    public float bookRotation;
    027    private static Random rand = new Random();
    028
    029    /**
    030     * Allows the entity to update its state. Overridden in most subclasses, e.g. the mob spawner uses this to count
    031     * ticks and creates a new spawn inside its implementation.
    032     */
    033    public void updateEntity()
    034    {
    035        super.updateEntity();
    036        this.bookSpreadPrev = this.bookSpread;
    037        this.bookRotationPrev = this.bookRotation2;
    038        EntityPlayer var1 = this.worldObj.getClosestPlayer((double)((float)this.xCoord + 0.5F), (double)((float)this.yCoord + 0.5F), (double)((float)this.zCoord + 0.5F), 3.0D);
    039
    040        if (var1 != null)
    041        {
    042            double var2 = var1.posX - (double)((float)this.xCoord + 0.5F);
    043            double var4 = var1.posZ - (double)((float)this.zCoord + 0.5F);
    044            this.bookRotation = (float)Math.atan2(var4, var2);
    045            this.bookSpread += 0.1F;
    046
    047            if (this.bookSpread < 0.5F || rand.nextInt(40) == 0)
    048            {
    049                float var6 = this.field_70373_d;
    050
    051                do
    052                {
    053                    this.field_70373_d += (float)(rand.nextInt(4) - rand.nextInt(4));
    054                }
    055                while (var6 == this.field_70373_d);
    056            }
    057        }
    058        else
    059        {
    060            this.bookRotation += 0.02F;
    061            this.bookSpread -= 0.1F;
    062        }
    063
    064        while (this.bookRotation2 >= (float)Math.PI)
    065        {
    066            this.bookRotation2 -= ((float)Math.PI * 2F);
    067        }
    068
    069        while (this.bookRotation2 < -(float)Math.PI)
    070        {
    071            this.bookRotation2 += ((float)Math.PI * 2F);
    072        }
    073
    074        while (this.bookRotation >= (float)Math.PI)
    075        {
    076            this.bookRotation -= ((float)Math.PI * 2F);
    077        }
    078
    079        while (this.bookRotation < -(float)Math.PI)
    080        {
    081            this.bookRotation += ((float)Math.PI * 2F);
    082        }
    083
    084        float var7;
    085
    086        for (var7 = this.bookRotation - this.bookRotation2; var7 >= (float)Math.PI; var7 -= ((float)Math.PI * 2F))
    087        {
    088            ;
    089        }
    090
    091        while (var7 < -(float)Math.PI)
    092        {
    093            var7 += ((float)Math.PI * 2F);
    094        }
    095
    096        this.bookRotation2 += var7 * 0.4F;
    097
    098        if (this.bookSpread < 0.0F)
    099        {
    100            this.bookSpread = 0.0F;
    101        }
    102
    103        if (this.bookSpread > 1.0F)
    104        {
    105            this.bookSpread = 1.0F;
    106        }
    107
    108        ++this.tickCount;
    109        this.pageFlipPrev = this.pageFlip;
    110        float var3 = (this.field_70373_d - this.pageFlip) * 0.4F;
    111        float var8 = 0.2F;
    112
    113        if (var3 < -var8)
    114        {
    115            var3 = -var8;
    116        }
    117
    118        if (var3 > var8)
    119        {
    120            var3 = var8;
    121        }
    122
    123        this.field_70374_e += (var3 - this.field_70374_e) * 0.9F;
    124        this.pageFlip += this.field_70374_e;
    125    }
    126}