RandomPositionGenerator.java

package net.minecraft.entity.ai;

import java.util.Random;
import net.minecraft.entity.EntityCreature;
import net.minecraft.util.BlockPos;
import net.minecraft.util.MathHelper;
import net.minecraft.util.Vec3;

public class RandomPositionGenerator
{
    /**
     * used to store a driection when the user passes a point to move towards or away from. WARNING: NEVER THREAD SAFE.
     * MULTIPLE findTowards and findAway calls, will share this var
     */
    private static Vec3 staticVector = new Vec3(0.0D, 0.0D, 0.0D);
    private static final String __OBFID = "CL_00001629";

    /**
     * finds a random target within par1(x,z) and par2 (y) blocks
     */
    public static Vec3 findRandomTarget(EntityCreature p_75463_0_, int p_75463_1_, int p_75463_2_)
    {
        return findRandomTargetBlock(p_75463_0_, p_75463_1_, p_75463_2_, (Vec3)null);
    }

    /**
     * finds a random target within par1(x,z) and par2 (y) blocks in the direction of the point par3
     */
    public static Vec3 findRandomTargetBlockTowards(EntityCreature p_75464_0_, int p_75464_1_, int p_75464_2_, Vec3 p_75464_3_)
    {
        staticVector = p_75464_3_.subtract(p_75464_0_.posX, p_75464_0_.posY, p_75464_0_.posZ);
        return findRandomTargetBlock(p_75464_0_, p_75464_1_, p_75464_2_, staticVector);
    }

    /**
     * finds a random target within par1(x,z) and par2 (y) blocks in the reverse direction of the point par3
     */
    public static Vec3 findRandomTargetBlockAwayFrom(EntityCreature p_75461_0_, int p_75461_1_, int p_75461_2_, Vec3 p_75461_3_)
    {
        staticVector = (new Vec3(p_75461_0_.posX, p_75461_0_.posY, p_75461_0_.posZ)).subtract(p_75461_3_);
        return findRandomTargetBlock(p_75461_0_, p_75461_1_, p_75461_2_, staticVector);
    }

    /**
     * searches 10 blocks at random in a within par1(x,z) and par2 (y) distance, ignores those not in the direction of
     * par3Vec3, then points to the tile for which creature.getBlockPathWeight returns the highest number
     */
    private static Vec3 findRandomTargetBlock(EntityCreature p_75462_0_, int p_75462_1_, int p_75462_2_, Vec3 p_75462_3_)
    {
        Random var4 = p_75462_0_.getRNG();
        boolean var5 = false;
        int var6 = 0;
        int var7 = 0;
        int var8 = 0;
        float var9 = -99999.0F;
        boolean var10;

        if (p_75462_0_.hasHome())
        {
            double var11 = p_75462_0_.func_180486_cf().distanceSq((double)MathHelper.floor_double(p_75462_0_.posX), (double)MathHelper.floor_double(p_75462_0_.posY), (double)MathHelper.floor_double(p_75462_0_.posZ)) + 4.0D;
            double var13 = (double)(p_75462_0_.getMaximumHomeDistance() + (float)p_75462_1_);
            var10 = var11 < var13 * var13;
        }
        else
        {
            var10 = false;
        }

        for (int var17 = 0; var17 < 10; ++var17)
        {
            int var12 = var4.nextInt(2 * p_75462_1_ + 1) - p_75462_1_;
            int var18 = var4.nextInt(2 * p_75462_2_ + 1) - p_75462_2_;
            int var14 = var4.nextInt(2 * p_75462_1_ + 1) - p_75462_1_;

            if (p_75462_3_ == null || (double)var12 * p_75462_3_.xCoord + (double)var14 * p_75462_3_.zCoord >= 0.0D)
            {
                BlockPos var15;

                if (p_75462_0_.hasHome() && p_75462_1_ > 1)
                {
                    var15 = p_75462_0_.func_180486_cf();

                    if (p_75462_0_.posX > (double)var15.getX())
                    {
                        var12 -= var4.nextInt(p_75462_1_ / 2);
                    }
                    else
                    {
                        var12 += var4.nextInt(p_75462_1_ / 2);
                    }

                    if (p_75462_0_.posZ > (double)var15.getZ())
                    {
                        var14 -= var4.nextInt(p_75462_1_ / 2);
                    }
                    else
                    {
                        var14 += var4.nextInt(p_75462_1_ / 2);
                    }
                }

                var12 += MathHelper.floor_double(p_75462_0_.posX);
                var18 += MathHelper.floor_double(p_75462_0_.posY);
                var14 += MathHelper.floor_double(p_75462_0_.posZ);
                var15 = new BlockPos(var12, var18, var14);

                if (!var10 || p_75462_0_.func_180485_d(var15))
                {
                    float var16 = p_75462_0_.func_180484_a(var15);

                    if (var16 > var9)
                    {
                        var9 = var16;
                        var6 = var12;
                        var7 = var18;
                        var8 = var14;
                        var5 = true;
                    }
                }
            }
        }

        if (var5)
        {
            return new Vec3((double)var6, (double)var7, (double)var8);
        }
        else
        {
            return null;
        }
    }
}