TileEntityEnchantmentTable.java

package net.minecraft.tileentity;

import java.util.Random;
import net.minecraft.entity.player.EntityPlayer;

public class TileEntityEnchantmentTable extends TileEntity
{
    /** Used by the render to make the book 'bounce' */
    public int tickCount;

    /** Value used for determining how the page flip should look. */
    public float pageFlip;

    /** The last tick's pageFlip value. */
    public float pageFlipPrev;
    public float field_70373_d;
    public float field_70374_e;

    /** The amount that the book is open. */
    public float bookSpread;

    /** The amount that the book is open. */
    public float bookSpreadPrev;
    public float bookRotation2;
    public float bookRotationPrev;
    public float bookRotation;
    private static Random rand = new Random();

    /**
     * Allows the entity to update its state. Overridden in most subclasses, e.g. the mob spawner uses this to count
     * ticks and creates a new spawn inside its implementation.
     */
    public void updateEntity()
    {
        super.updateEntity();
        this.bookSpreadPrev = this.bookSpread;
        this.bookRotationPrev = this.bookRotation2;
        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);

        if (var1 != null)
        {
            double var2 = var1.posX - (double)((float)this.xCoord + 0.5F);
            double var4 = var1.posZ - (double)((float)this.zCoord + 0.5F);
            this.bookRotation = (float)Math.atan2(var4, var2);
            this.bookSpread += 0.1F;

            if (this.bookSpread < 0.5F || rand.nextInt(40) == 0)
            {
                float var6 = this.field_70373_d;

                do
                {
                    this.field_70373_d += (float)(rand.nextInt(4) - rand.nextInt(4));
                }
                while (var6 == this.field_70373_d);
            }
        }
        else
        {
            this.bookRotation += 0.02F;
            this.bookSpread -= 0.1F;
        }

        while (this.bookRotation2 >= (float)Math.PI)
        {
            this.bookRotation2 -= ((float)Math.PI * 2F);
        }

        while (this.bookRotation2 < -(float)Math.PI)
        {
            this.bookRotation2 += ((float)Math.PI * 2F);
        }

        while (this.bookRotation >= (float)Math.PI)
        {
            this.bookRotation -= ((float)Math.PI * 2F);
        }

        while (this.bookRotation < -(float)Math.PI)
        {
            this.bookRotation += ((float)Math.PI * 2F);
        }

        float var7;

        for (var7 = this.bookRotation - this.bookRotation2; var7 >= (float)Math.PI; var7 -= ((float)Math.PI * 2F))
        {
            ;
        }

        while (var7 < -(float)Math.PI)
        {
            var7 += ((float)Math.PI * 2F);
        }

        this.bookRotation2 += var7 * 0.4F;

        if (this.bookSpread < 0.0F)
        {
            this.bookSpread = 0.0F;
        }

        if (this.bookSpread > 1.0F)
        {
            this.bookSpread = 1.0F;
        }

        ++this.tickCount;
        this.pageFlipPrev = this.pageFlip;
        float var3 = (this.field_70373_d - this.pageFlip) * 0.4F;
        float var8 = 0.2F;

        if (var3 < -var8)
        {
            var3 = -var8;
        }

        if (var3 > var8)
        {
            var3 = var8;
        }

        this.field_70374_e += (var3 - this.field_70374_e) * 0.9F;
        this.pageFlip += this.field_70374_e;
    }
}