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/*
* Copyright (C) 2000-2001 The Exult Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef PATHFINDER_H
#define PATHFINDER_H
#include "tiles.h"
/*
* This class provides A* cost methods.
*/
class Pathfinder_client
{
private:
int move_flags;
public:
// Figure when to give up.
virtual int get_max_cost(int cost_to_goal);
// Figure cost for a single step.
virtual int get_step_cost(Tile_coord from, Tile_coord& to) = 0;
// Estimate cost between two points.
virtual int estimate_cost(Tile_coord& from, Tile_coord& to) = 0;
// Is tile at the goal?
virtual int at_goal(Tile_coord& tile, Tile_coord& goal);
int get_move_flags() { return move_flags; }
void set_move_flags(int m) { move_flags = m;}
};
/*
* Base class for all PathFinders.
*/
class PathFinder
{
protected:
Tile_coord src; // Source tile.
Tile_coord dest; // Destination.
public:
// Find a path from sx,sy,sz to dx,dy,dz
// Return 0 if no path can be traced.
// Return !0 if path found
PathFinder() : src(),dest()
{ }
virtual int NewPath(Tile_coord s, Tile_coord d,
Pathfinder_client *client)=0;
// Retrieve starting point (set by subclasses).
Tile_coord get_src()
{ return src; }
// Retrieve current destination (set by subclasses).
Tile_coord get_dest()
{ return dest; }
// Retrieve the coordinates of the next step on the path
virtual int GetNextStep(Tile_coord& n, bool& done)=0;
int GetNextStep(Tile_coord& n)
{ // If you don't care about last step.
bool d;
return GetNextStep(n, d);
}
// Set to retrieve in opposite order.
virtual int set_backwards()
{ return 0; } // Default: Can't do it.
virtual int following_smart_path() // Astar?
{ return 0; }
virtual int get_num_steps() = 0;// # of steps left to take.
virtual ~PathFinder();
};
#endif
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