server/server/move.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team
 * Copyright (©) 1992,2007 Frank Tore Johansen
 * 
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero GNU General Public License as published by the
 * Free Software Foundation, either version 3 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 Affero GNU General Public License
 * and the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 * 
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

#include <global.h>
#ifndef __CEXTRACT__
# include <sproto.h>
#endif

/*
 * move_object() tries to move object op in the direction "dir".
 * If it fails (something blocks the passage), it returns 0,
 * otherwise 1.
 * This is an improvement from the previous move_ob(), which
 * removed and inserted objects even if they were unable to move.
 */
int
move_object (object *op, int dir)
{
  return op->move (dir);
}

/* object op is trying to move in direction dir.
 * originator is typically the same as op, but
 * can be different if originator is causing op to
 * move (originator is pushing op)
 * returns 0 if the object is not able to move to the
 * desired space, 1 otherwise (in which case we also 
 * move the object accordingly.  This function is
 * very similiar to move_object.
  */
int
move_ob (object *op, int dir, object *originator)
{
  return op->move (dir, originator);
}

int
object::move (int dir, object *originator)
{
  sint16 newx = x + freearr_x[dir];
  sint16 newy = y + freearr_y[dir];

  mapxy pos (this);
  pos.move (dir);

  /* If the space the object is moving to is out of the map,
   * bail now - we know it can't work.
   */
  if (!pos.normalise ())
    return 0;

  /* Is this space blocked?  Players with wizpass are immune to
   * this condition.
   */
  if (blocked_link (this, pos.m, pos.x, pos.y) && !flag [FLAG_WIZPASS])
    return 0;

  // check tail movability
  if (more && !more->move (dir, more->head))
    return 0;

  /* we need to set the direction for the new animation code.
   * it uses it to figure out face to use - I can't see it
   * breaking anything, but it might.
   */
  direction = dir;

  if (will_apply & 4)
    check_earthwalls (this, pos.m, pos.x, pos.y);

  if (will_apply & 8)
    check_doors (this, pos.m, pos.x, pos.y);

  /* If this is a tail portion, just want to tell caller that move is
   * ok - the caller will deal with actual object removal/insertion
   */
  if (head)
    return 1;

  if (pos.m != map && contr)
    {
      if (INVOKE_MAP (LEAVE, map, ARG_PLAYER (contr)))
        return 0;

      remove ();

      if (INVOKE_PLAYER (MAP_CHANGE, contr, ARG_MAP (pos.m), ARG_INT (pos.x), ARG_INT (pos.y)))
        return 0;

      if (INVOKE_MAP (ENTER, pos.m, ARG_PLAYER (contr), ARG_INT (pos.x), ARG_INT (pos.y)))
        return 0;
    }

  /* insert_ob_in_map will deal with any tiling issues */
  pos.insert (this, originator);

  return 1;
}

/*
 * transfer_ob(): Move an object (even linked objects) to another spot
 * on the same map.
 *
 * Does nothing if there is no free spot.
 *
 * randomly: If true, use find_free_spot() to find the destination, otherwise
 * use find_first_free_spot().
 *
 * Return value: 1 if object was destroyed, 0 otherwise.
 */

int
transfer_ob (object *op, int x, int y, int randomly, object *originator)
{
  int i;
  object *tmp;

  if (randomly)
    i = find_free_spot (op, op->map, x, y, 0, SIZEOFFREE);
  else
    i = find_first_free_spot (op, op->map, x, y);

  if (i == -1)
    return 0;                   /* No free spot */

  op = op->head_ ();
  op->remove ();

  for (object *tmp = op; tmp; tmp = tmp->more)
    {
      tmp->x = x + freearr_x[i] + tmp->arch->x;
      tmp->y = y + freearr_y[i] + tmp->arch->y;
    }

  op = insert_ob_in_map (op, op->map, originator, 0);

  return !op;
}

/*
 * Return value: 1 if object was destroyed, 0 otherwise.
 * Modified so that instead of passing the 'originator' that had no
 * real use, instead we pass the 'user' of the teleporter.  All the
 * callers know what they wanted to teleporter (move_teleporter or
 * shop map code)
 * tele_type is the type of teleporter we want to match against -
 * currently, this is either set to SHOP_MAT or TELEPORTER.
 * It is basically used so that shop_mats and normal teleporters can
 * be used close to each other and not have the player put to the
 * one of another type.
 */
int
teleport (object *teleporter, uint8 tele_type, object *user)
{
  if (!user)
    return 0;

  object *other_teleporter = 0;
  int nrofalt = 0;

  user = user->head_ ();

  /* Find all other teleporters within range.  This range
   * should really be setable by some object attribute instead of
   * using hard coded values.
   */
  unordered_mapwalk (teleporter, -5, -5, 5, 5)
    {
      mapspace &ms = m->at (nx, ny);

      for (object *tmp = ms.top; tmp; tmp = tmp->below)
        if (tmp->type == tele_type)
          {
            if ((dx || dy) && !rndm (++nrofalt))
              other_teleporter = tmp;

            break;
          }
      }

  if (!nrofalt)
    {
      LOG (llevError, "%s: no alternative teleporters around (user %s).\n",
           teleporter->debug_desc (), user->debug_desc ());
      return 0;
    }

  int k = find_free_spot (user, other_teleporter->map, other_teleporter->x, other_teleporter->y, 1, 9);

  /* if k==-1, unable to find a free spot.  If this is shop
   * mat that the player is using, find someplace to move
   * the player - otherwise, player can get trapped in the shops
   * that appear in random dungeons.  We basically just make
   * sure the space isn't no pass (eg wall), and don't care
   * about is alive.
   */
  if (k == -1)
    {
      if (tele_type == SHOP_MAT && user->is_player ())
        {
          for (k = 1; k < 9; k++)
            {
              maptile *m;
              sint16 sx, sy;

              if (get_map_flags (other_teleporter->map, &m,
                                 other_teleporter->x + freearr_x[k], other_teleporter->y + freearr_y[k], &sx, &sy) & P_OUT_OF_MAP)
                continue;

              if (!OB_TYPE_MOVE_BLOCK (user, GET_MAP_MOVE_BLOCK (m, sx, sy)))
                break;
            }

          if (k == 9)
            {
              LOG (llevError, "Shop mat %s (%d, %d) is in solid rock?\n",
                   &other_teleporter->name, other_teleporter->x, other_teleporter->y);
              return 0;
            }
        }
      else
        return 0;
    }

  return !other_teleporter->map->insert (
            user, other_teleporter->x + freearr_x[k], other_teleporter->y + freearr_y[k]
         );
}

/*
 * This is a new version of blocked, this one handles objects
 * that can be passed through by monsters with the CAN_PASS_THRU defined.
 *
 * very new version handles also multipart objects
 * This is currently only used for the boulder roll code.
 * Returns 1 if object does not fit, 0 if it does.
 */
static int
try_fit (object *op, maptile *m, int x, int y)
{
  object *tmp, *more;
  sint16 tx, ty;
  int mflags;
  maptile *m2;

  if (op->head)
    op = op->head;

  for (more = op; more; more = more->more)
    {
      tx = x + more->x - op->x;
      ty = y + more->y - op->y;

      mflags = get_map_flags (m, &m2, tx, ty, &tx, &ty);

      if (mflags & P_OUT_OF_MAP)
        return 1;

      for (tmp = GET_MAP_OB (m2, tx, ty); tmp; tmp = tmp->above)
        {
          if (tmp->head == op || tmp == op)
            continue;

          if ((QUERY_FLAG (tmp, FLAG_ALIVE) && tmp->type != DOOR))
            return 1;

          if (OB_MOVE_BLOCK (op, tmp))
            return 1;

        }
    }
  return 0;
}

/*
 * this is not perfect yet. 
 * it does not roll objects behind multipart objects properly.
 * Support for rolling multipart objects is questionable.
 */
static int
roll_ob (object *op, int dir, object *pusher)
{
  sint16 x, y;
  int flags;
  maptile *m;
  MoveType move_block;

  if (op->head)
    op = op->head;

  x = op->x + freearr_x[dir];
  y = op->y + freearr_y[dir];

  if (!QUERY_FLAG (op, FLAG_CAN_ROLL)
      || (op->weight && random_roll (0, op->weight / 50000 - 1, pusher, PREFER_LOW)
          > pusher->stats.Str))
    return 0;

  m = op->map;
  flags = get_map_flags (m, &m, x, y, &x, &y);

  if (flags & (P_OUT_OF_MAP | P_IS_ALIVE))
    return 0;

  move_block = GET_MAP_MOVE_BLOCK (m, x, y);

  /* If the target space is not blocked, no need to look at the objects on it */
  if ((op->move_type & move_block) == op->move_type)
    {
      for (object *tmp = GET_MAP_OB (m, x, y); tmp; tmp = tmp->above)
        {
          if (tmp->head == op)
            continue;

          if (OB_MOVE_BLOCK (op, tmp) && !roll_ob (tmp, dir, pusher))
            return 0;
        }
    }

  if (try_fit (op, m, x, y))
    return 0;

  op->move (dir);

  return 1;
}

void
recursive_roll (object *op, int dir, object *pusher)
{
  if (!roll_ob (op, dir, pusher))
    {
      new_draw_info_format (NDI_UNIQUE, 0, pusher, "You fail to push the %s.", query_name (op));
      return;
    }

  move_ob (pusher, dir, pusher);
  new_draw_info_format (NDI_BLACK, 0, pusher, "You move the %s.", query_name (op));
  return;
}

/* returns 1 if pushing invokes a attack, 0 when not */
int
push_ob (object *who, int dir, object *pusher)
{
  int str1, str2;
  object *owner;

  if (who->head != NULL)
    who = who->head;
  owner = who->owner;

  /* Wake up sleeping monsters that may be pushed */
  CLEAR_FLAG (who, FLAG_SLEEP);

  /* player change place with his pets or summoned creature */
  /* TODO: allow multi arch pushing. Can't be very difficult */
  if (who->more == NULL
      && ((owner && owner->contr && pusher->contr && same_party (owner->contr->party, pusher->contr->party))
          || owner == pusher)
    )
    {
      int temp;
      maptile *m;

      who->remove ();
      pusher->remove ();
      temp = pusher->x;
      pusher->x = who->x;
      who->x = temp;

      temp = pusher->y;
      pusher->y = who->y;
      who->y = temp;

      m = pusher->map;
      pusher->map = who->map;
      who->map = m;

      insert_ob_in_map (who, who->map, pusher, 0);
      insert_ob_in_map (pusher, pusher->map, pusher, 0);

      return 0;
    }

  /* We want ONLY become enemy of evil, unaggressive monster. We must RUN in them */
  /* In original we have here a unaggressive check only - that was the reason why */
  /* we so often become an enemy of friendly monsters... */
  /* funny: was they set to unaggressive 0 (= not so nice) they don't attack */
  if (owner != pusher && pusher->type == PLAYER && who->type != PLAYER &&
      !QUERY_FLAG (who, FLAG_FRIENDLY) && !QUERY_FLAG (who, FLAG_NEUTRAL))
    {
      if (pusher->contr->run_on)        /* only when we run */
        {
          new_draw_info_format (NDI_UNIQUE, 0, pusher, "You start to attack %s!!", &who->name);
          CLEAR_FLAG (who, FLAG_UNAGGRESSIVE);  /* the sucker don't like you anymore */
          who->enemy = pusher;
          return 1;
        }
      else
        new_draw_info_format (NDI_UNIQUE, 0, pusher, "You avoid attacking %s. H<You have to run if you wish to attack unnagressive NPCs.>", &who->name);
    }

  /* now, let's test stand still. we NEVER can push stand_still monsters. */
  if (QUERY_FLAG (who, FLAG_STAND_STILL))
    {
      new_draw_info_format (NDI_UNIQUE, 0, pusher, "You can't push %s. H<You simply can't.>", &who->name);
      return 0;
    }

  /* This block is basically if you are pushing friendly but
   * non pet creaturs.
   * It basically does a random strength comparision to
   * determine if you can push someone around.  Note that
   * this pushes the other person away - its not a swap.
   */

  str1 = (who->stats.Str > 0 ? who->stats.Str : who->level);
  str2 = (pusher->stats.Str > 0 ? pusher->stats.Str : pusher->level);
  if (QUERY_FLAG (who, FLAG_WIZ) ||
      random_roll (str1, str1 * 5 / 2, who, PREFER_HIGH) >=
      random_roll (str2, str2 * 5 / 2, pusher, PREFER_HIGH) || !move_object (who, dir))
    {
      if (who->type == PLAYER)
        new_draw_info_format (NDI_UNIQUE, 0, who, "%s tried to push you.", &pusher->name);

      return 0;
    }

  /* If we get here, the push succeeded.
   * Let everyone know the status.
   */
  if (who->type == PLAYER)
    new_draw_info_format (NDI_UNIQUE, 0, who, "%s pushed you.", &pusher->name);

  if (pusher->type == PLAYER)
    new_draw_info_format (NDI_UNIQUE, 0, pusher, "You pushed %s back.", &who->name);

  return 1;
}
Revision:	1.35
Committed:	Sun Nov 15 19:13:10 2009 UTC (14 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-2_92
Changes since 1.34:	+3 -6 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	*
4	* Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	* Copyright (©) 2002,2007 Mark Wedel & Crossfire Development Team
6	* Copyright (©) 1992,2007 Frank Tore Johansen
7	*
8	* Deliantra is free software: you can redistribute it and/or modify it under
9	* the terms of the Affero GNU General Public License as published by the
10	* Free Software Foundation, either version 3 of the License, or (at your
11	* option) any later version.
12	*
13	* This program is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	* GNU General Public License for more details.
17	*
18	* You should have received a copy of the Affero GNU General Public License
19	* and the GNU General Public License along with this program. If not, see
20	* <http://www.gnu.org/licenses/>.
21	*
22	* The authors can be reached via e-mail to <support@deliantra.net>
23	*/
24
25	#include <global.h>
26	#ifndef __CEXTRACT__
27	# include <sproto.h>
28	#endif
29
30	/*
31	* move_object() tries to move object op in the direction "dir".
32	* If it fails (something blocks the passage), it returns 0,
33	* otherwise 1.
34	* This is an improvement from the previous move_ob(), which
35	* removed and inserted objects even if they were unable to move.
36	*/
37	int
38	move_object (object *op, int dir)
39	{
40	return op->move (dir);
41	}
42
43	/* object op is trying to move in direction dir.
44	* originator is typically the same as op, but
45	* can be different if originator is causing op to
46	* move (originator is pushing op)
47	* returns 0 if the object is not able to move to the
48	* desired space, 1 otherwise (in which case we also
49	* move the object accordingly. This function is
50	* very similiar to move_object.
51	*/
52	int
53	move_ob (object op, int dir, object originator)
54	{
55	return op->move (dir, originator);
56	}
57
58	int
59	object::move (int dir, object *originator)
60	{
61	sint16 newx = x + freearr_x[dir];
62	sint16 newy = y + freearr_y[dir];
63
64	mapxy pos (this);
65	pos.move (dir);
66
67	/* If the space the object is moving to is out of the map,
68	* bail now - we know it can't work.
69	*/
70	if (!pos.normalise ())
71	return 0;
72
73	/* Is this space blocked? Players with wizpass are immune to
74	* this condition.
75	*/
76	if (blocked_link (this, pos.m, pos.x, pos.y) && !flag [FLAG_WIZPASS])
77	return 0;
78
79	// check tail movability
80	if (more && !more->move (dir, more->head))
81	return 0;
82
83	/* we need to set the direction for the new animation code.
84	* it uses it to figure out face to use - I can't see it
85	* breaking anything, but it might.
86	*/
87	direction = dir;
88
89	if (will_apply & 4)
90	check_earthwalls (this, pos.m, pos.x, pos.y);
91
92	if (will_apply & 8)
93	check_doors (this, pos.m, pos.x, pos.y);
94
95	/* If this is a tail portion, just want to tell caller that move is
96	* ok - the caller will deal with actual object removal/insertion
97	*/
98	if (head)
99	return 1;
100
101	if (pos.m != map && contr)
102	{
103	if (INVOKE_MAP (LEAVE, map, ARG_PLAYER (contr)))
104	return 0;
105
106	remove ();
107
108	if (INVOKE_PLAYER (MAP_CHANGE, contr, ARG_MAP (pos.m), ARG_INT (pos.x), ARG_INT (pos.y)))
109	return 0;
110
111	if (INVOKE_MAP (ENTER, pos.m, ARG_PLAYER (contr), ARG_INT (pos.x), ARG_INT (pos.y)))
112	return 0;
113	}
114
115	/* insert_ob_in_map will deal with any tiling issues */
116	pos.insert (this, originator);
117
118	return 1;
119	}
120
121	/*
122	* transfer_ob(): Move an object (even linked objects) to another spot
123	* on the same map.
124	*
125	* Does nothing if there is no free spot.
126	*
127	* randomly: If true, use find_free_spot() to find the destination, otherwise
128	* use find_first_free_spot().
129	*
130	* Return value: 1 if object was destroyed, 0 otherwise.
131	*/
132
133	int
134	transfer_ob (object op, int x, int y, int randomly, object originator)
135	{
136	int i;
137	object *tmp;
138
139	if (randomly)
140	i = find_free_spot (op, op->map, x, y, 0, SIZEOFFREE);
141	else
142	i = find_first_free_spot (op, op->map, x, y);
143
144	if (i == -1)
145	return 0; /* No free spot */
146
147	op = op->head_ ();
148	op->remove ();
149
150	for (object *tmp = op; tmp; tmp = tmp->more)
151	{
152	tmp->x = x + freearr_x[i] + tmp->arch->x;
153	tmp->y = y + freearr_y[i] + tmp->arch->y;
154	}
155
156	op = insert_ob_in_map (op, op->map, originator, 0);
157
158	return !op;
159	}
160
161	/*
162	* Return value: 1 if object was destroyed, 0 otherwise.
163	* Modified so that instead of passing the 'originator' that had no
164	* real use, instead we pass the 'user' of the teleporter. All the
165	* callers know what they wanted to teleporter (move_teleporter or
166	* shop map code)
167	* tele_type is the type of teleporter we want to match against -
168	* currently, this is either set to SHOP_MAT or TELEPORTER.
169	* It is basically used so that shop_mats and normal teleporters can
170	* be used close to each other and not have the player put to the
171	* one of another type.
172	*/
173	int
174	teleport (object teleporter, uint8 tele_type, object user)
175	{
176	if (!user)
177	return 0;
178
179	object *other_teleporter = 0;
180	int nrofalt = 0;
181
182	user = user->head_ ();
183
184	/* Find all other teleporters within range. This range
185	* should really be setable by some object attribute instead of
186	* using hard coded values.
187	*/
188	unordered_mapwalk (teleporter, -5, -5, 5, 5)
189	{
190	mapspace &ms = m->at (nx, ny);
191
192	for (object *tmp = ms.top; tmp; tmp = tmp->below)
193	if (tmp->type == tele_type)
194	{
195	if ((dx \|\| dy) && !rndm (++nrofalt))
196	other_teleporter = tmp;
197
198	break;
199	}
200	}
201
202	if (!nrofalt)
203	{
204	LOG (llevError, "%s: no alternative teleporters around (user %s).\n",
205	teleporter->debug_desc (), user->debug_desc ());
206	return 0;
207	}
208
209	int k = find_free_spot (user, other_teleporter->map, other_teleporter->x, other_teleporter->y, 1, 9);
210
211	/* if k==-1, unable to find a free spot. If this is shop
212	* mat that the player is using, find someplace to move
213	* the player - otherwise, player can get trapped in the shops
214	* that appear in random dungeons. We basically just make
215	* sure the space isn't no pass (eg wall), and don't care
216	* about is alive.
217	*/
218	if (k == -1)
219	{
220	if (tele_type == SHOP_MAT && user->is_player ())
221	{
222	for (k = 1; k < 9; k++)
223	{
224	maptile *m;
225	sint16 sx, sy;
226
227	if (get_map_flags (other_teleporter->map, &m,
228	other_teleporter->x + freearr_x[k], other_teleporter->y + freearr_y[k], &sx, &sy) & P_OUT_OF_MAP)
229	continue;
230
231	if (!OB_TYPE_MOVE_BLOCK (user, GET_MAP_MOVE_BLOCK (m, sx, sy)))
232	break;
233	}
234
235	if (k == 9)
236	{
237	LOG (llevError, "Shop mat %s (%d, %d) is in solid rock?\n",
238	&other_teleporter->name, other_teleporter->x, other_teleporter->y);
239	return 0;
240	}
241	}
242	else
243	return 0;
244	}
245
246	return !other_teleporter->map->insert (
247	user, other_teleporter->x + freearr_x[k], other_teleporter->y + freearr_y[k]
248	);
249	}
250
251	/*
252	* This is a new version of blocked, this one handles objects
253	* that can be passed through by monsters with the CAN_PASS_THRU defined.
254	*
255	* very new version handles also multipart objects
256	* This is currently only used for the boulder roll code.
257	* Returns 1 if object does not fit, 0 if it does.
258	*/
259	static int
260	try_fit (object op, maptile m, int x, int y)
261	{
262	object tmp, more;
263	sint16 tx, ty;
264	int mflags;
265	maptile *m2;
266
267	if (op->head)
268	op = op->head;
269
270	for (more = op; more; more = more->more)
271	{
272	tx = x + more->x - op->x;
273	ty = y + more->y - op->y;
274
275	mflags = get_map_flags (m, &m2, tx, ty, &tx, &ty);
276
277	if (mflags & P_OUT_OF_MAP)
278	return 1;
279
280	for (tmp = GET_MAP_OB (m2, tx, ty); tmp; tmp = tmp->above)
281	{
282	if (tmp->head == op \|\| tmp == op)
283	continue;
284
285	if ((QUERY_FLAG (tmp, FLAG_ALIVE) && tmp->type != DOOR))
286	return 1;
287
288	if (OB_MOVE_BLOCK (op, tmp))
289	return 1;
290
291	}
292	}
293	return 0;
294	}
295
296	/*
297	* this is not perfect yet.
298	* it does not roll objects behind multipart objects properly.
299	* Support for rolling multipart objects is questionable.
300	*/
301	static int
302	roll_ob (object op, int dir, object pusher)
303	{
304	sint16 x, y;
305	int flags;
306	maptile *m;
307	MoveType move_block;
308
309	if (op->head)
310	op = op->head;
311
312	x = op->x + freearr_x[dir];
313	y = op->y + freearr_y[dir];
314
315	if (!QUERY_FLAG (op, FLAG_CAN_ROLL)
316	\|\| (op->weight && random_roll (0, op->weight / 50000 - 1, pusher, PREFER_LOW)
317	> pusher->stats.Str))
318	return 0;
319
320	m = op->map;
321	flags = get_map_flags (m, &m, x, y, &x, &y);
322
323	if (flags & (P_OUT_OF_MAP \| P_IS_ALIVE))
324	return 0;
325
326	move_block = GET_MAP_MOVE_BLOCK (m, x, y);
327
328	/* If the target space is not blocked, no need to look at the objects on it */
329	if ((op->move_type & move_block) == op->move_type)
330	{
331	for (object *tmp = GET_MAP_OB (m, x, y); tmp; tmp = tmp->above)
332	{
333	if (tmp->head == op)
334	continue;
335
336	if (OB_MOVE_BLOCK (op, tmp) && !roll_ob (tmp, dir, pusher))
337	return 0;
338	}
339	}
340
341	if (try_fit (op, m, x, y))
342	return 0;
343
344	op->move (dir);
345
346	return 1;
347	}
348
349	void
350	recursive_roll (object op, int dir, object pusher)
351	{
352	if (!roll_ob (op, dir, pusher))
353	{
354	new_draw_info_format (NDI_UNIQUE, 0, pusher, "You fail to push the %s.", query_name (op));
355	return;
356	}
357
358	move_ob (pusher, dir, pusher);
359	new_draw_info_format (NDI_BLACK, 0, pusher, "You move the %s.", query_name (op));
360	return;
361	}
362
363	/* returns 1 if pushing invokes a attack, 0 when not */
364	int
365	push_ob (object who, int dir, object pusher)
366	{
367	int str1, str2;
368	object *owner;
369
370	if (who->head != NULL)
371	who = who->head;
372	owner = who->owner;
373
374	/* Wake up sleeping monsters that may be pushed */
375	CLEAR_FLAG (who, FLAG_SLEEP);
376
377	/* player change place with his pets or summoned creature */
378	/* TODO: allow multi arch pushing. Can't be very difficult */
379	if (who->more == NULL
380	&& ((owner && owner->contr && pusher->contr && same_party (owner->contr->party, pusher->contr->party))
381	\|\| owner == pusher)
382	)
383	{
384	int temp;
385	maptile *m;
386
387	who->remove ();
388	pusher->remove ();
389	temp = pusher->x;
390	pusher->x = who->x;
391	who->x = temp;
392
393	temp = pusher->y;
394	pusher->y = who->y;
395	who->y = temp;
396
397	m = pusher->map;
398	pusher->map = who->map;
399	who->map = m;
400
401	insert_ob_in_map (who, who->map, pusher, 0);
402	insert_ob_in_map (pusher, pusher->map, pusher, 0);
403
404	return 0;
405	}
406
407	/* We want ONLY become enemy of evil, unaggressive monster. We must RUN in them */
408	/* In original we have here a unaggressive check only - that was the reason why */
409	/* we so often become an enemy of friendly monsters... */
410	/* funny: was they set to unaggressive 0 (= not so nice) they don't attack */
411	if (owner != pusher && pusher->type == PLAYER && who->type != PLAYER &&
412	!QUERY_FLAG (who, FLAG_FRIENDLY) && !QUERY_FLAG (who, FLAG_NEUTRAL))
413	{
414	if (pusher->contr->run_on) /* only when we run */
415	{
416	new_draw_info_format (NDI_UNIQUE, 0, pusher, "You start to attack %s!!", &who->name);
417	CLEAR_FLAG (who, FLAG_UNAGGRESSIVE); /* the sucker don't like you anymore */
418	who->enemy = pusher;
419	return 1;
420	}
421	else
422	new_draw_info_format (NDI_UNIQUE, 0, pusher, "You avoid attacking %s. H<You have to run if you wish to attack unnagressive NPCs.>", &who->name);
423	}
424
425	/* now, let's test stand still. we NEVER can push stand_still monsters. */
426	if (QUERY_FLAG (who, FLAG_STAND_STILL))
427	{
428	new_draw_info_format (NDI_UNIQUE, 0, pusher, "You can't push %s. H<You simply can't.>", &who->name);
429	return 0;
430	}
431
432	/* This block is basically if you are pushing friendly but
433	* non pet creaturs.
434	* It basically does a random strength comparision to
435	* determine if you can push someone around. Note that
436	* this pushes the other person away - its not a swap.
437	*/
438
439	str1 = (who->stats.Str > 0 ? who->stats.Str : who->level);
440	str2 = (pusher->stats.Str > 0 ? pusher->stats.Str : pusher->level);
441	if (QUERY_FLAG (who, FLAG_WIZ) \|\|
442	random_roll (str1, str1 * 5 / 2, who, PREFER_HIGH) >=
443	random_roll (str2, str2 * 5 / 2, pusher, PREFER_HIGH) \|\| !move_object (who, dir))
444	{
445	if (who->type == PLAYER)
446	new_draw_info_format (NDI_UNIQUE, 0, who, "%s tried to push you.", &pusher->name);
447
448	return 0;
449	}
450
451	/* If we get here, the push succeeded.
452	* Let everyone know the status.
453	*/
454	if (who->type == PLAYER)
455	new_draw_info_format (NDI_UNIQUE, 0, who, "%s pushed you.", &pusher->name);
456
457	if (pusher->type == PLAYER)
458	new_draw_info_format (NDI_UNIQUE, 0, pusher, "You pushed %s back.", &who->name);
459
460	return 1;
461	}