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// Copyright (c) Hercules Dev Team, licensed under GNU GPL.
// See the LICENSE file
// Portions Copyright (c) Athena Dev Teams
#ifndef _PATH_H_
#define _PATH_H_
#include "map.h" // enum cell_chk
#define MOVE_COST 10
#define MOVE_DIAGONAL_COST 14
#define MAX_WALKPATH 32
struct walkpath_data {
unsigned char path_len,path_pos;
unsigned char path[MAX_WALKPATH];
};
struct shootpath_data {
int rx,ry,len;
int x[MAX_WALKPATH];
int y[MAX_WALKPATH];
};
#define check_distance_bl(bl1, bl2, distance) (path->check_distance((bl1)->x - (bl2)->x, (bl1)->y - (bl2)->y, distance))
#define check_distance_blxy(bl, x1, y1, distance) (path->check_distance((bl)->x - (x1), (bl)->y - (y1), distance))
#define check_distance_xy(x0, y0, x1, y1, distance) (path->check_distance((x0) - (x1), (y0) - (y1), distance))
#define distance_bl(bl1, bl2) (path->distance((bl1)->x - (bl2)->x, (bl1)->y - (bl2)->y))
#define distance_blxy(bl, x1, y1) (path->distance((bl)->x - (x1), (bl)->y - (y1)))
#define distance_xy(x0, y0, x1, y1) (path->distance((x0) - (x1), (y0) - (y1)))
struct path_interface {
// calculates destination cell for knockback
int (*blownpos) (int16 m, int16 x0, int16 y0, int16 dx, int16 dy, int count);
// tries to find a walkable path
bool (*search) (struct walkpath_data *wpd, int16 m, int16 x0, int16 y0, int16 x1, int16 y1, int flag, cell_chk cell);
// tries to find a shootable path
bool (*search_long) (struct shootpath_data *spd, int16 m, int16 x0, int16 y0, int16 x1, int16 y1, cell_chk cell);
int (*check_distance) (int dx, int dy, int distance);
unsigned int (*distance) (int dx, int dy);
};
struct path_interface *path;
void path_defaults(void);
#endif /* _PATH_H_ */
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