package net.minecraft.entity.ai;
import java.util.Random;
import net.minecraft.entity.EntityCreature;
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 = Vec3.createVectorHelper(0.0D, 0.0D, 0.0D);
/**
* finds a random target within par1(x,z) and par2 (y) blocks
*/
public static Vec3 findRandomTarget(EntityCreature par0EntityCreature, int par1, int par2)
{
return findRandomTargetBlock(par0EntityCreature, par1, par2, (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 par0EntityCreature, int par1, int par2, Vec3 par3Vec3)
{
staticVector.xCoord = par3Vec3.xCoord - par0EntityCreature.posX;
staticVector.yCoord = par3Vec3.yCoord - par0EntityCreature.posY;
staticVector.zCoord = par3Vec3.zCoord - par0EntityCreature.posZ;
return findRandomTargetBlock(par0EntityCreature, par1, par2, 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 par0EntityCreature, int par1, int par2, Vec3 par3Vec3)
{
staticVector.xCoord = par0EntityCreature.posX - par3Vec3.xCoord;
staticVector.yCoord = par0EntityCreature.posY - par3Vec3.yCoord;
staticVector.zCoord = par0EntityCreature.posZ - par3Vec3.zCoord;
return findRandomTargetBlock(par0EntityCreature, par1, par2, 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 par0EntityCreature, int par1, int par2, Vec3 par3Vec3)
{
Random var4 = par0EntityCreature.getRNG();
boolean var5 = false;
int var6 = 0;
int var7 = 0;
int var8 = 0;
float var9 = -99999.0F;
boolean var10;
if (par0EntityCreature.hasHome())
{
double var11 = (double)(par0EntityCreature.getHomePosition().getDistanceSquared(MathHelper.floor_double(par0EntityCreature.posX), MathHelper.floor_double(par0EntityCreature.posY), MathHelper.floor_double(par0EntityCreature.posZ)) + 4.0F);
double var13 = (double)(par0EntityCreature.getMaximumHomeDistance() + (float)par1);
var10 = var11 < var13 * var13;
}
else
{
var10 = false;
}
for (int var16 = 0; var16 < 10; ++var16)
{
int var12 = var4.nextInt(2 * par1) - par1;
int var17 = var4.nextInt(2 * par2) - par2;
int var14 = var4.nextInt(2 * par1) - par1;
if (par3Vec3 == null || (double)var12 * par3Vec3.xCoord + (double)var14 * par3Vec3.zCoord >= 0.0D)
{
var12 += MathHelper.floor_double(par0EntityCreature.posX);
var17 += MathHelper.floor_double(par0EntityCreature.posY);
var14 += MathHelper.floor_double(par0EntityCreature.posZ);
if (!var10 || par0EntityCreature.isWithinHomeDistance(var12, var17, var14))
{
float var15 = par0EntityCreature.getBlockPathWeight(var12, var17, var14);
if (var15 > var9)
{
var9 = var15;
var6 = var12;
var7 = var17;
var8 = var14;
var5 = true;
}
}
}
}
if (var5)
{
return par0EntityCreature.worldObj.getWorldVec3Pool().getVecFromPool((double)var6, (double)var7, (double)var8);
}
else
{
return null;
}
}
}