chunk allocation and utility functions More...

#include "angband.h"
#include "cave.h"
#include "cmds.h"
#include "cmd-core.h"
#include "game-event.h"
#include "game-world.h"
#include "init.h"
#include "monster.h"
#include "obj-ignore.h"
#include "obj-pile.h"
#include "obj-tval.h"
#include "obj-util.h"
#include "object.h"
#include "player-timed.h"
#include "trap.h"

Functions
int	lookup_feat (const char *name)
	Find a terrain feature index by name. More...

void	set_terrain (void)
	Set terrain constants to the indices from terrain.txt. More...

struct chunk *	cave_new (int height, int width)
	Allocate a new chunk of the world. More...

void	cave_free (struct chunk *c)
	Free a chunk. More...

void	list_object (struct chunk c, struct object obj)
	Enter an object in the list of objects for the current level/chunk. More...

void	delist_object (struct chunk c, struct object obj)
	Remove an object from the list of objects for the current level/chunk. More...

void	object_lists_check_integrity (struct chunk c, struct chunk c_k)
	Check that a pair of object lists are consistent and relate to locations of objects correctly. More...

void	scatter (struct chunk c, int yp, int *xp, int y, int x, int d, bool need_los)
	Standard "find me a location" function, now with all legal outputs! More...

struct monster *	cave_monster (struct chunk *c, int idx)
	Get a monster on the current level by its index. More...

int	cave_monster_max (struct chunk *c)
	The maximum number of monsters allowed in the level. More...

int	cave_monster_count (struct chunk *c)
	The current number of monsters present on the level. More...

int	count_feats (int y, int x, bool(test)(struct chunk c, int y, int x), bool under)
	Return the number of doors/traps around (or under) the character. More...

Variables
struct feature *	f_info

struct chunk *	cave = NULL

int	FEAT_NONE

int	FEAT_FLOOR

int	FEAT_CLOSED

int	FEAT_OPEN

int	FEAT_BROKEN

int	FEAT_LESS

int	FEAT_MORE

int	FEAT_SECRET

int	FEAT_RUBBLE

int	FEAT_PASS_RUBBLE

int	FEAT_MAGMA

int	FEAT_QUARTZ

int	FEAT_MAGMA_K

int	FEAT_QUARTZ_K

int	FEAT_GRANITE

int	FEAT_PERM

int	FEAT_LAVA

const s16b	ddd [9]
	Global array for looping through the "keypad directions". More...

const s16b	ddx [10]
	Global arrays for converting "keypad direction" into "offsets". More...

const s16b	ddy [10]

const s16b	ddx_ddd [9]
	Global arrays for optimizing "ddx[ddd[i]]" and "ddy[ddd[i]]". More...

const s16b	ddy_ddd [9]

static const int	d_off_y_0 []
	Hack – Precompute a bunch of calls to distance(). More...

static const int	d_off_x_0 []

static const int	d_off_y_1 []

static const int	d_off_x_1 []

static const int	d_off_y_2 []

static const int	d_off_x_2 []

static const int	d_off_y_3 []

static const int	d_off_x_3 []

static const int	d_off_y_4 []

static const int	d_off_x_4 []

static const int	d_off_y_5 []

static const int	d_off_x_5 []

static const int	d_off_y_6 []

static const int	d_off_x_6 []

static const int	d_off_y_7 []

static const int	d_off_x_7 []

static const int	d_off_y_8 []

static const int	d_off_x_8 []

static const int	d_off_y_9 []

static const int	d_off_x_9 []

const int *	dist_offsets_y [10]

const int *	dist_offsets_x [10]

const byte	side_dirs [20][8]
	Given a central direction at position [dir #][0], return a series of directions radiating out on both sides from the central direction all the way back to its rear. More...

Detailed Description

chunk allocation and utility functions

This work is free software; you can redistribute it and/or modify it under the terms of either:

a) the GNU General Public License as published by the Free Software Foundation, version 2, or

b) the "Angband licence": This software may be copied and distributed for educational, research, and not for profit purposes provided that this copyright and statement are included in all such copies. Other copyrights may also apply.

Function Documentation

void cave_free ( struct chunk * c )

Free a chunk.

References chunk::feat_count, heatmap::grids, chunk::height, square::info, mem_free(), chunk::monsters, chunk::name, chunk::noise, square::obj, object_pile_free(), chunk::objects, chunk::scent, square_free_trap(), chunk::squares, string_free(), square::trap, and chunk::width.

Referenced by cave_clear(), cave_generate(), cavern_chunk(), cleanup_angband(), cleanup_player(), gauntlet_gen(), hard_centre_gen(), and lair_gen().

struct monster* cave_monster	(	struct chunk *	c,
		int	idx
	)

Get a monster on the current level by its index.

References chunk::monsters, and NULL.

Referenced by add_monster_lights(), call_monster(), chunk_copy(), chunk_write(), compact_monsters(), compact_monsters_aux(), delete_monster_idx(), do_animation(), do_cmd_walk_test(), do_cmd_wiz_zap(), effect_handler_BALL(), effect_handler_BANISH(), effect_handler_BREATH(), effect_handler_DAMAGE(), effect_handler_DETECT_EVIL(), effect_handler_DETECT_INVISIBLE_MONSTERS(), effect_handler_DETECT_VISIBLE_MONSTERS(), effect_handler_DRAIN_MANA(), effect_handler_MASS_BANISH(), effect_handler_MON_HEAL_HP(), effect_handler_MON_HEAL_KIN(), effect_handler_MON_TIMED_INC(), effect_handler_PROBE(), effect_handler_PROJECT_LOS(), effect_handler_PROJECT_LOS_AWARE(), effect_handler_SUMMON(), effect_handler_TELEPORT(), effect_handler_TELEPORT_TO(), effect_handler_WAKE(), find_artifact(), get_target(), grid_data_as_text(), look_mon_desc(), map_info(), mon_pop(), monster_list_collect(), monster_list_show_subwindow(), monster_swap(), move_player(), origin_get_loc(), place_monster(), player_inc_check(), process_monsters(), process_player_cleanup(), project_m(), project_o(), project_p(), project_player_handler_NEXUS(), reset_monsters(), spell_value_base_spell_power(), square_monster(), update_monsters(), wipe_mon_list(), and wr_monsters_aux().

int cave_monster_count ( struct chunk * c )

The current number of monsters present on the level.

References chunk::mon_cnt.

Referenced by process_world().

int cave_monster_max ( struct chunk * c )

struct chunk* cave_new	(	int	height,
		int	width
	)

Allocate a new chunk of the world.

References chunk::created_at, angband_constants::f_max, chunk::feat_count, heatmap::grids, chunk::height, height, square::info, angband_constants::level_monster_max, mem_zalloc(), chunk::mon_current, chunk::mon_max, chunk::monsters, chunk::noise, chunk::obj_max, OBJECT_LIST_SIZE, chunk::objects, chunk::scent, SQUARE_SIZE, chunk::squares, turn, chunk::width, width, and z_info.

Referenced by cave_generate(), cavern_chunk(), chunk_write(), classic_gen(), gauntlet_gen(), hard_centre_gen(), labyrinth_chunk(), lair_gen(), modified_chunk(), moria_chunk(), rd_dungeon_aux(), town_gen(), and vault_chunk().

int count_feats	(	int *	y,
		int *	x,
		bool()(struct chunk c, int y, int x)	test,
		bool	under
	)

Return the number of doors/traps around (or under) the character.

References ddx_ddd, ddy_ddd, player::px, player::py, square_in_bounds_fully(), and square_isknown().

Referenced by do_cmd_close(), do_cmd_disarm(), do_cmd_open(), and effect_handler_RUBBLE().

void delist_object	(	struct chunk *	c,
		struct object *	obj
	)

Remove an object from the list of objects for the current level/chunk.

This function is robust against delisting of unlisted objects.

References player::cave, NULL, chunk::objects, and object::oidx.

Referenced by become_aware(), delete_monster_idx(), floor_carry(), floor_carry_fail(), floor_object_for_use(), player_pickup_aux(), player_pickup_gold(), process_monster_grab_objects(), project_o(), square_know_pile(), and uncurse_object().

void list_object	(	struct chunk *	c,
		struct object *	obj
	)

Enter an object in the list of objects for the current level/chunk.

This function is robust against listing of duplicates or non-objects

References player::cave, i, mem_realloc(), NULL, chunk::obj_max, OBJECT_LIST_INCR, chunk::objects, and object::oidx.

Referenced by floor_carry(), monster_carry(), place_gold(), place_monster(), and place_object().

int lookup_feat ( const char * name )

Find a terrain feature index by name.

References angband_constants::f_max, i, feature::name, quit_fmt(), streq, and z_info.

Referenced by map_info(), parse_prefs_feat(), set_terrain(), and square_apparent_name().

void object_lists_check_integrity	(	struct chunk *	c,
		struct chunk *	c_k
	)

Check that a pair of object lists are consistent and relate to locations of objects correctly.

References i, object::ix, object::iy, object::known, square::obj, chunk::obj_max, chunk::objects, object::oidx, pile_contains(), and chunk::squares.

Referenced by square_know_pile().

void scatter	(	struct chunk *	c,
		int *	yp,
		int *	xp,
		int	y,
		int	x,
		int	d,
		bool	need_los
	)

Standard "find me a location" function, now with all legal outputs!

Obtains a legal location within the given distance of the initial location, and with "los()" from the source to destination location.

This function is often called from inside a loop which searches for locations while increasing the "d" distance.

need_los determines whether line of sight is needed

References distance(), los(), rand_spread, and square_in_bounds_fully().

Referenced by build_quest_stairs(), do_cmd_wiz_named(), multiply_monster(), place_friends(), summon_specific(), and vault_monsters().

void set_terrain ( void )

Set terrain constants to the indices from terrain.txt.

References FEAT_BROKEN, FEAT_CLOSED, FEAT_FLOOR, FEAT_GRANITE, FEAT_LAVA, FEAT_LESS, FEAT_MAGMA, FEAT_MAGMA_K, FEAT_MORE, FEAT_NONE, FEAT_OPEN, FEAT_PASS_RUBBLE, FEAT_PERM, FEAT_QUARTZ, FEAT_QUARTZ_K, FEAT_RUBBLE, FEAT_SECRET, and lookup_feat().

Referenced by finish_parse_feat().

Variable Documentation

struct chunk* cave = NULL

const int d_off_x_0[]

static

Initial value:

=

{ 0 }

const int d_off_x_1[]

static

Initial value:

=

{ -1, 0, 1, -1, 1, -1, 0, 1, 0 }

const int d_off_x_2[]

static

Initial value:

=

{ -2, 2, -1, 0, 1, -2, 2, -2, 2, -1, 0, 1, 0 }

const int d_off_x_3[]

static

Initial value:

=
{ -3, 3, -2, 2, -1, 0, 1, -3, 3, -3, 3, -2, 2,
  -1, 0, 1, 0 }

const int d_off_x_4[]

static

Initial value:

=
{ -4, 4, -3, 3, -2, -3, 2, 3, -1, 0, 1, -4, 4,
  -4, 4, -3, 3, -2, -3, 2, 3, -1, 0, 1, 0 }

const int d_off_x_5[]

static

Initial value:

=
{ -5, 5, -4, 4, -4, 4, -2, -3, 2, 3, -1, 0, 1,
  -5, 5, -5, 5, -4, 4, -4, 4, -2, -3, 2, 3, -1,
  0, 1, 0 }

const int d_off_x_6[]

static

Initial value:

=
{ -6, 6, -5, 5, -5, 5, -4, 4, -2, -3, 2, 3, -1,
  0, 1, -6, 6, -6, 6, -5, 5, -5, 5, -4, 4, -2,
  -3, 2, 3, -1, 0, 1, 0 }

const int d_off_x_7[]

static

Initial value:

=
{ -7, 7, -6, 6, -6, 6, -5, 5, -4, -5, 4, 5, -2,
  -3, 2, 3, -1, 0, 1, -7, 7, -7, 7, -6, 6, -6,
  6, -5, 5, -4, -5, 4, 5, -2, -3, 2, 3, -1, 0,
  1, 0 }

const int d_off_x_8[]

static

Initial value:

=
{ -8, 8, -7, 7, -7, 7, -6, 6, -6, 6, -4, -5, 4,
  5, -2, -3, 2, 3, -1, 0, 1, -8, 8, -8, 8, -7,
  7, -7, 7, -6, 6, -6, 6, -4, -5, 4, 5, -2, -3,
  2, 3, -1, 0, 1, 0 }

const int d_off_x_9[]

static

Initial value:

=
{ -9, 9, -8, 8, -8, 8, -7, 7, -7, 7, -6, 6, -4,
  -5, 4, 5, -2, -3, 2, 3, -1, 0, 1, -9, 9, -9,
  9, -8, 8, -8, 8, -7, 7, -7, 7, -6, 6, -4, -5,
  4, 5, -2, -3, 2, 3, -1, 0, 1, 0 }

const int d_off_y_0[]

static

Initial value:

=

{ 0 }

Hack – Precompute a bunch of calls to distance().

The pair of arrays dist_offsets_y[n] and dist_offsets_x[n] contain the offsets of all the locations with a distance of n from a central point, with an offset of (0,0) indicating no more offsets at this distance.

This is, of course, fairly unreadable, but it eliminates multiple loops from the previous version.

It is probably better to replace these arrays with code to compute the relevant arrays, even if the storage is pre-allocated in hard coded sizes. At the very least, code should be included which is able to generate and dump these arrays (ala "los()"). XXX XXX XXX

const int d_off_y_1[]

static

Initial value:

=

{ -1, -1, -1, 0, 0, 1, 1, 1, 0 }

const int d_off_y_2[]

static

Initial value:

=

{ -1, -1, -2, -2, -2, 0, 0, 1, 1, 2, 2, 2, 0 }

const int d_off_y_3[]

static

Initial value:

=
{ -1, -1, -2, -2, -3, -3, -3, 0, 0, 1, 1, 2, 2,
  3, 3, 3, 0 }

const int d_off_y_4[]

static

Initial value:

=
{ -1, -1, -2, -2, -3, -3, -3, -3, -4, -4, -4, 0,
  0, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 0 }

const int d_off_y_5[]

static

Initial value:

=
{ -1, -1, -2, -2, -3, -3, -4, -4, -4, -4, -5, -5,
  -5, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 4, 4, 5, 5,
  5, 0 }

const int d_off_y_6[]

static

Initial value:

=
{ -1, -1, -2, -2, -3, -3, -4, -4, -5, -5, -5, -5,
  -6, -6, -6, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5,
  5, 5, 6, 6, 6, 0 }

const int d_off_y_7[]

static

Initial value:

=
{ -1, -1, -2, -2, -3, -3, -4, -4, -5, -5, -5, -5,
  -6, -6, -6, -6, -7, -7, -7, 0, 0, 1, 1, 2, 2, 3,
  3, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 0 }

const int d_off_y_8[]

static

Initial value:

=
{ -1, -1, -2, -2, -3, -3, -4, -4, -5, -5, -6, -6,
  -6, -6, -7, -7, -7, -7, -8, -8, -8, 0, 0, 1, 1,
  2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,
  8, 8, 8, 0 }

const int d_off_y_9[]

static

Initial value:

=
{ -1, -1, -2, -2, -3, -3, -4, -4, -5, -5, -6, -6,
  -7, -7, -7, -7, -8, -8, -8, -8, -9, -9, -9, 0,
  0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 7,
  7, 8, 8, 8, 8, 9, 9, 9, 0 }

const s16b ddd[9]

Initial value:

=

{ 2, 8, 6, 4, 3, 1, 9, 7, 5 }

Global array for looping through the "keypad directions".

Referenced by build_streamer(), player_confuse_dir(), and process_monster().

const s16b ddx[10]

Initial value:

=

{ 0, -1, 0, 1, -1, 0, 1, -1, 0, 1 }

Global arrays for converting "keypad direction" into "offsets".

Referenced by build_streamer(), change_panel(), column_process_direction(), do_cmd_alter_aux(), do_cmd_close(), do_cmd_disarm(), do_cmd_jump(), do_cmd_open(), do_cmd_options_win(), do_cmd_run(), do_cmd_tunnel(), do_cmd_walk(), effect_handler_BALL(), effect_handler_BIZARRE(), effect_handler_BREATH(), effect_handler_SWARM(), findpath(), get_target(), glyph_command(), move_player(), object_skin_process_direction(), process_monster(), ranged_helper(), run_init(), run_step(), run_test(), scroll_process_direction(), see_wall(), target_set_interactive(), and tile_picker_command().

const s16b ddx_ddd[9]

Initial value:

=

{ 0, 0, 1, -1, 1, -1, 1, -1, 0 }

Global arrays for optimizing "ddx[ddd[i]]" and "ddy[ddd[i]]".

This means that each entry in this array corresponds to the direction with the same array index in ddd[].

Referenced by build_room_of_chambers(), cave_illuminate(), cave_known(), count_chests(), count_feats(), effect_handler_EARTHQUAKE(), effect_handler_MAP_AREA(), effect_handler_RUBBLE(), effect_handler_STAR(), effect_handler_STAR_BALL(), effect_handler_THRUST_AWAY(), generate_starburst_room(), get_moves(), get_moves_advance(), get_moves_fear(), hollow_out_room(), make_chamber(), make_noise(), next_to_corr(), place_new_monster_group(), project(), rand_dir(), update_scent(), update_view_one(), and wiz_light().

const s16b ddy[10]

Initial value:

=

{ 0, 1, 1, 1, 0, 0, 0, -1, -1, -1 }

Referenced by build_streamer(), change_panel(), column_process_direction(), do_cmd_alter_aux(), do_cmd_close(), do_cmd_disarm(), do_cmd_jump(), do_cmd_open(), do_cmd_options_win(), do_cmd_run(), do_cmd_tunnel(), do_cmd_walk(), effect_handler_BALL(), effect_handler_BIZARRE(), effect_handler_BREATH(), effect_handler_SWARM(), findpath(), get_target(), glyph_command(), menu_handle_keypress(), move_player(), object_skin_process_direction(), process_monster(), ranged_helper(), run_init(), run_step(), run_test(), scroll_process_direction(), see_wall(), target_set_interactive(), and tile_picker_command().

const s16b ddy_ddd[9]

Initial value:

=

{ 1, -1, 0, 0, 1, 1, -1, -1, 0 }

Referenced by build_room_of_chambers(), cave_illuminate(), cave_known(), count_chests(), count_feats(), effect_handler_EARTHQUAKE(), effect_handler_MAP_AREA(), effect_handler_RUBBLE(), effect_handler_STAR(), effect_handler_STAR_BALL(), effect_handler_THRUST_AWAY(), generate_starburst_room(), get_moves(), get_moves_advance(), get_moves_fear(), hollow_out_room(), make_chamber(), make_noise(), next_to_corr(), place_new_monster_group(), project(), rand_dir(), update_scent(), update_view_one(), and wiz_light().

const int* dist_offsets_x[10]

Initial value:

=
{
    d_off_x_0, d_off_x_1, d_off_x_2, d_off_x_3, d_off_x_4,
    d_off_x_5, d_off_x_6, d_off_x_7, d_off_x_8, d_off_x_9
}

Referenced by find_hiding(), and find_safety().

const int* dist_offsets_y[10]

Initial value:

=
{
    d_off_y_0, d_off_y_1, d_off_y_2, d_off_y_3, d_off_y_4,
    d_off_y_5, d_off_y_6, d_off_y_7, d_off_y_8, d_off_y_9
}

Referenced by find_hiding(), and find_safety().

struct feature* f_info

Referenced by build_store(), cleanup_feat(), display_feature(), display_map(), do_cmd_knowledge_features(), dump_features(), f_cmp_fkind(), feat_is_bright(), feat_is_fiery(), feat_is_floor(), feat_is_granite(), feat_is_magma(), feat_is_monster_walkable(), feat_is_no_flow(), feat_is_no_scent(), feat_is_object_holding(), feat_is_passable(), feat_is_projectable(), feat_is_quartz(), feat_is_shop(), feat_is_smooth(), feat_is_torch(), feat_is_trap_holding(), feat_is_treasure(), feat_is_wall(), feat_lore(), feat_order(), finish_parse_feat(), grid_data_as_text(), lookup_symbol(), map_info(), reset_visuals(), square_apparent_name(), square_digging(), square_feat(), square_hasgoldvein(), square_isbrokendoor(), square_iscloseddoor(), square_isdoor(), square_isdownstairs(), square_isinteresting(), square_isopendoor(), square_isperm(), square_isrock(), square_isrubble(), square_issecretdoor(), square_isstairs(), square_isupstairs(), square_seemslikewall(), and square_shopnum().

int FEAT_BROKEN

Referenced by build_room_of_chambers(), do_cmd_wiz_features(), hollow_out_room(), place_random_door(), set_terrain(), and square_smash_door().

int FEAT_CLOSED

Referenced by build_crossed(), build_large(), build_nest(), build_pit(), do_cmd_wiz_features(), place_closed_door(), set_terrain(), square_add_door(), and square_close_door().

int FEAT_LAVA

Referenced by build_vault(), project_feature_handler_FIRE(), project_feature_handler_PLASMA(), set_terrain(), and town_gen_layout().

int FEAT_LESS

Referenced by build_vault(), cavern_gen(), classic_gen(), do_cmd_wiz_features(), gauntlet_gen(), hard_centre_gen(), labyrinth_gen(), lair_gen(), modified_gen(), moria_gen(), new_player_spot(), place_random_stairs(), place_stairs(), set_terrain(), and square_add_stairs().

int FEAT_MAGMA

Referenced by build_room_of_chambers(), classic_gen(), do_cmd_wiz_features(), hollow_out_room(), lair_gen(), make_chamber(), make_inner_chamber_wall(), modified_gen(), moria_gen(), set_terrain(), square_destroy(), square_earthquake(), and square_upgrade_mineral().

int FEAT_MAGMA_K

Referenced by build_vault(), do_cmd_wiz_features(), set_terrain(), and square_upgrade_mineral().

int FEAT_MORE

Referenced by build_quest_stairs(), build_vault(), cavern_gen(), classic_gen(), do_cmd_wiz_features(), gauntlet_gen(), hard_centre_gen(), labyrinth_gen(), lair_gen(), modified_gen(), moria_gen(), new_player_spot(), place_random_stairs(), place_stairs(), set_terrain(), square_add_stairs(), town_gen(), and town_gen_layout().

int FEAT_NONE

Referenced by map_info(), set_terrain(), square_forget(), and square_isknown().

int FEAT_OPEN

Referenced by build_room_of_chambers(), do_cmd_wiz_features(), hollow_out_room(), make_chamber(), place_random_door(), set_terrain(), square_add_door(), and square_open_door().

int FEAT_PASS_RUBBLE

Referenced by build_huge(), build_moria(), build_vault(), do_cmd_wiz_features(), effect_handler_RUBBLE(), map_info(), place_rubble(), project_feature_handler_COLD(), project_feature_handler_ICE(), set_terrain(), and town_gen_layout().

int FEAT_PERM

Referenced by build_store(), build_vault(), cavern_gen(), classic_gen(), do_cmd_wiz_features(), gauntlet_gen(), hard_centre_gen(), labyrinth_chunk(), lair_gen(), map_info(), modified_chunk(), modified_gen(), moria_chunk(), moria_gen(), set_terrain(), and town_gen_layout().

int FEAT_QUARTZ

Referenced by classic_gen(), do_cmd_wiz_features(), lair_gen(), modified_gen(), moria_gen(), set_terrain(), square_destroy(), square_earthquake(), and square_upgrade_mineral().

int FEAT_QUARTZ_K

Referenced by build_vault(), do_cmd_wiz_features(), set_terrain(), and square_upgrade_mineral().

int FEAT_RUBBLE

Referenced by build_vault(), do_cmd_wiz_features(), effect_handler_RUBBLE(), place_rubble(), project_feature_handler_COLD(), project_feature_handler_ICE(), and set_terrain().

int FEAT_SECRET

Referenced by build_crossed(), do_cmd_wiz_features(), place_secret_door(), and set_terrain().

const byte side_dirs[20][8]

Initial value:

= {
    {0, 0, 0, 0, 0, 0, 0, 0},   
    {1, 4, 2, 7, 3, 8, 6, 9},
    {2, 1, 3, 4, 6, 7, 9, 8},
    {3, 2, 6, 1, 9, 4, 8, 7},
    {4, 7, 1, 8, 2, 9, 3, 6},
    {5, 5, 5, 5, 5, 5, 5, 5},
    {6, 3, 9, 2, 8, 1, 7, 4},
    {7, 8, 4, 9, 1, 6, 2, 3},
    {8, 9, 7, 6, 4, 3, 1, 2},
    {9, 6, 8, 3, 7, 2, 4, 1},
    {0, 0, 0, 0, 0, 0, 0, 0},   
    {1, 2, 4, 3, 7, 6, 8, 9},
    {2, 3, 1, 6, 4, 9, 7, 8},
    {3, 6, 2, 9, 1, 8, 4, 7},
    {4, 1, 7, 2, 8, 3, 9, 6},
    {5, 5, 5, 5, 5, 5, 5, 5},
    {6, 9, 3, 8, 2, 7, 1, 4},
    {7, 4, 8, 1, 9, 2, 6, 3},
    {8, 7, 9, 4, 6, 1, 3, 2},
    {9, 8, 6, 7, 3, 4, 2, 1}
}

Given a central direction at position [dir #][0], return a series of directions radiating out on both sides from the central direction all the way back to its rear.

Side directions come in pairs; for example, directions '1' and '3' flank direction '2'. The code should know which side to consider first. If the left, it must add 10 to the central direction to access the second part of the table.

Referenced by process_monster().

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