package net.minecraft.pathfinding;
import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.entity.Entity;
import net.minecraft.util.IntHashMap;
import net.minecraft.util.MathHelper;
import net.minecraft.world.IBlockAccess;
public class PathFinder
{
/** Used to find obstacles */
private IBlockAccess worldMap;
/** The path being generated */
private Path path = new Path();
/** The points in the path */
private IntHashMap pointMap = new IntHashMap();
/** Selection of path points to add to the path */
private PathPoint[] pathOptions = new PathPoint[32];
/** should the PathFinder go through wodden door blocks */
private boolean isWoddenDoorAllowed;
/**
* should the PathFinder disregard BlockMovement type materials in its path
*/
private boolean isMovementBlockAllowed;
private boolean isPathingInWater;
/** tells the FathFinder to not stop pathing underwater */
private boolean canEntityDrown;
public PathFinder(IBlockAccess par1IBlockAccess, boolean par2, boolean par3, boolean par4, boolean par5)
{
this.worldMap = par1IBlockAccess;
this.isWoddenDoorAllowed = par2;
this.isMovementBlockAllowed = par3;
this.isPathingInWater = par4;
this.canEntityDrown = par5;
}
/**
* Creates a path from one entity to another within a minimum distance
*/
public PathEntity createEntityPathTo(Entity par1Entity, Entity par2Entity, float par3)
{
return this.createEntityPathTo(par1Entity, par2Entity.posX, par2Entity.boundingBox.minY, par2Entity.posZ, par3);
}
/**
* Creates a path from an entity to a specified location within a minimum distance
*/
public PathEntity createEntityPathTo(Entity par1Entity, int par2, int par3, int par4, float par5)
{
return this.createEntityPathTo(par1Entity, (double)((float)par2 + 0.5F), (double)((float)par3 + 0.5F), (double)((float)par4 + 0.5F), par5);
}
/**
* Internal implementation of creating a path from an entity to a point
*/
private PathEntity createEntityPathTo(Entity par1Entity, double par2, double par4, double par6, float par8)
{
this.path.clearPath();
this.pointMap.clearMap();
boolean var9 = this.isPathingInWater;
int var10 = MathHelper.floor_double(par1Entity.boundingBox.minY + 0.5D);
if (this.canEntityDrown && par1Entity.isInWater())
{
var10 = (int)par1Entity.boundingBox.minY;
for (int var11 = this.worldMap.getBlockId(MathHelper.floor_double(par1Entity.posX), var10, MathHelper.floor_double(par1Entity.posZ)); var11 == Block.waterMoving.blockID || var11 == Block.waterStill.blockID; var11 = this.worldMap.getBlockId(MathHelper.floor_double(par1Entity.posX), var10, MathHelper.floor_double(par1Entity.posZ)))
{
++var10;
}
var9 = this.isPathingInWater;
this.isPathingInWater = false;
}
else
{
var10 = MathHelper.floor_double(par1Entity.boundingBox.minY + 0.5D);
}
PathPoint var15 = this.openPoint(MathHelper.floor_double(par1Entity.boundingBox.minX), var10, MathHelper.floor_double(par1Entity.boundingBox.minZ));
PathPoint var12 = this.openPoint(MathHelper.floor_double(par2 - (double)(par1Entity.width / 2.0F)), MathHelper.floor_double(par4), MathHelper.floor_double(par6 - (double)(par1Entity.width / 2.0F)));
PathPoint var13 = new PathPoint(MathHelper.floor_float(par1Entity.width + 1.0F), MathHelper.floor_float(par1Entity.height + 1.0F), MathHelper.floor_float(par1Entity.width + 1.0F));
PathEntity var14 = this.addToPath(par1Entity, var15, var12, var13, par8);
this.isPathingInWater = var9;
return var14;
}
/**
* Adds a path from start to end and returns the whole path (args: unused, start, end, unused, maxDistance)
*/
private PathEntity addToPath(Entity par1Entity, PathPoint par2PathPoint, PathPoint par3PathPoint, PathPoint par4PathPoint, float par5)
{
par2PathPoint.totalPathDistance = 0.0F;
par2PathPoint.distanceToNext = par2PathPoint.func_75832_b(par3PathPoint);
par2PathPoint.distanceToTarget = par2PathPoint.distanceToNext;
this.path.clearPath();
this.path.addPoint(par2PathPoint);
PathPoint var6 = par2PathPoint;
while (!this.path.isPathEmpty())
{
PathPoint var7 = this.path.dequeue();
if (var7.equals(par3PathPoint))
{
return this.createEntityPath(par2PathPoint, par3PathPoint);
}
if (var7.func_75832_b(par3PathPoint) < var6.func_75832_b(par3PathPoint))
{
var6 = var7;
}
var7.isFirst = true;
int var8 = this.findPathOptions(par1Entity, var7, par4PathPoint, par3PathPoint, par5);
for (int var9 = 0; var9 < var8; ++var9)
{
PathPoint var10 = this.pathOptions[var9];
float var11 = var7.totalPathDistance + var7.func_75832_b(var10);
if (!var10.isAssigned() || var11 < var10.totalPathDistance)
{
var10.previous = var7;
var10.totalPathDistance = var11;
var10.distanceToNext = var10.func_75832_b(par3PathPoint);
if (var10.isAssigned())
{
this.path.changeDistance(var10, var10.totalPathDistance + var10.distanceToNext);
}
else
{
var10.distanceToTarget = var10.totalPathDistance + var10.distanceToNext;
this.path.addPoint(var10);
}
}
}
}
if (var6 == par2PathPoint)
{
return null;
}
else
{
return this.createEntityPath(par2PathPoint, var6);
}
}
/**
* populates pathOptions with available points and returns the number of options found (args: unused1, currentPoint,
* unused2, targetPoint, maxDistance)
*/
private int findPathOptions(Entity par1Entity, PathPoint par2PathPoint, PathPoint par3PathPoint, PathPoint par4PathPoint, float par5)
{
int var6 = 0;
byte var7 = 0;
if (this.getVerticalOffset(par1Entity, par2PathPoint.xCoord, par2PathPoint.yCoord + 1, par2PathPoint.zCoord, par3PathPoint) == 1)
{
var7 = 1;
}
PathPoint var8 = this.getSafePoint(par1Entity, par2PathPoint.xCoord, par2PathPoint.yCoord, par2PathPoint.zCoord + 1, par3PathPoint, var7);
PathPoint var9 = this.getSafePoint(par1Entity, par2PathPoint.xCoord - 1, par2PathPoint.yCoord, par2PathPoint.zCoord, par3PathPoint, var7);
PathPoint var10 = this.getSafePoint(par1Entity, par2PathPoint.xCoord + 1, par2PathPoint.yCoord, par2PathPoint.zCoord, par3PathPoint, var7);
PathPoint var11 = this.getSafePoint(par1Entity, par2PathPoint.xCoord, par2PathPoint.yCoord, par2PathPoint.zCoord - 1, par3PathPoint, var7);
if (var8 != null && !var8.isFirst && var8.distanceTo(par4PathPoint) < par5)
{
this.pathOptions[var6++] = var8;
}
if (var9 != null && !var9.isFirst && var9.distanceTo(par4PathPoint) < par5)
{
this.pathOptions[var6++] = var9;
}
if (var10 != null && !var10.isFirst && var10.distanceTo(par4PathPoint) < par5)
{
this.pathOptions[var6++] = var10;
}
if (var11 != null && !var11.isFirst && var11.distanceTo(par4PathPoint) < par5)
{
this.pathOptions[var6++] = var11;
}
return var6;
}
/**
* Returns a point that the entity can safely move to
*/
private PathPoint getSafePoint(Entity par1Entity, int par2, int par3, int par4, PathPoint par5PathPoint, int par6)
{
PathPoint var7 = null;
int var8 = this.getVerticalOffset(par1Entity, par2, par3, par4, par5PathPoint);
if (var8 == 2)
{
return this.openPoint(par2, par3, par4);
}
else
{
if (var8 == 1)
{
var7 = this.openPoint(par2, par3, par4);
}
if (var7 == null && par6 > 0 && var8 != -3 && var8 != -4 && this.getVerticalOffset(par1Entity, par2, par3 + par6, par4, par5PathPoint) == 1)
{
var7 = this.openPoint(par2, par3 + par6, par4);
par3 += par6;
}
if (var7 != null)
{
int var9 = 0;
int var10 = 0;
while (par3 > 0)
{
var10 = this.getVerticalOffset(par1Entity, par2, par3 - 1, par4, par5PathPoint);
if (this.isPathingInWater && var10 == -1)
{
return null;
}
if (var10 != 1)
{
break;
}
if (var9++ >= par1Entity.func_82143_as())
{
return null;
}
--par3;
if (par3 > 0)
{
var7 = this.openPoint(par2, par3, par4);
}
}
if (var10 == -2)
{
return null;
}
}
return var7;
}
}
/**
* Returns a mapped point or creates and adds one
*/
private final PathPoint openPoint(int par1, int par2, int par3)
{
int var4 = PathPoint.makeHash(par1, par2, par3);
PathPoint var5 = (PathPoint)this.pointMap.lookup(var4);
if (var5 == null)
{
var5 = new PathPoint(par1, par2, par3);
this.pointMap.addKey(var4, var5);
}
return var5;
}
/**
* Checks if an entity collides with blocks at a position. Returns 1 if clear, 0 for colliding with any solid block,
* -1 for water(if avoiding water) but otherwise clear, -2 for lava, -3 for fence, -4 for closed trapdoor, 2 if
* otherwise clear except for open trapdoor or water(if not avoiding)
*/
public int getVerticalOffset(Entity par1Entity, int par2, int par3, int par4, PathPoint par5PathPoint)
{
return func_82565_a(par1Entity, par2, par3, par4, par5PathPoint, this.isPathingInWater, this.isMovementBlockAllowed, this.isWoddenDoorAllowed);
}
public static int func_82565_a(Entity par0Entity, int par1, int par2, int par3, PathPoint par4PathPoint, boolean par5, boolean par6, boolean par7)
{
boolean var8 = false;
for (int var9 = par1; var9 < par1 + par4PathPoint.xCoord; ++var9)
{
for (int var10 = par2; var10 < par2 + par4PathPoint.yCoord; ++var10)
{
for (int var11 = par3; var11 < par3 + par4PathPoint.zCoord; ++var11)
{
int var12 = par0Entity.worldObj.getBlockId(var9, var10, var11);
if (var12 > 0)
{
if (var12 == Block.trapdoor.blockID)
{
var8 = true;
}
else if (var12 != Block.waterMoving.blockID && var12 != Block.waterStill.blockID)
{
if (!par7 && var12 == Block.doorWood.blockID)
{
return 0;
}
}
else
{
if (par5)
{
return -1;
}
var8 = true;
}
Block var13 = Block.blocksList[var12];
if (!var13.getBlocksMovement(par0Entity.worldObj, var9, var10, var11) && (!par6 || var12 != Block.doorWood.blockID))
{
int var14 = var13.getRenderType();
if (var14 == 11 || var12 == Block.fenceGate.blockID || var14 == 32)
{
return -3;
}
if (var12 == Block.trapdoor.blockID)
{
return -4;
}
Material var15 = var13.blockMaterial;
if (var15 != Material.lava)
{
return 0;
}
if (!par0Entity.handleLavaMovement())
{
return -2;
}
}
}
}
}
}
return var8 ? 2 : 1;
}
/**
* Returns a new PathEntity for a given start and end point
*/
private PathEntity createEntityPath(PathPoint par1PathPoint, PathPoint par2PathPoint)
{
int var3 = 1;
PathPoint var4;
for (var4 = par2PathPoint; var4.previous != null; var4 = var4.previous)
{
++var3;
}
PathPoint[] var5 = new PathPoint[var3];
var4 = par2PathPoint;
--var3;
for (var5[var3] = par2PathPoint; var4.previous != null; var5[var3] = var4)
{
var4 = var4.previous;
--var3;
}
return new PathEntity(var5);
}
}