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- /* omega copyright (c) 1987,1988,1989 by Laurence Raphael Brothers */
- /* mmove.c */
- /* monster move functions */
-
- #include "glob.h"
-
-
- /* like m_normal_move, but can open doors */
- void m_smart_move(m)
- struct monster *m;
- {
- m_simple_move(m);
- }
-
- /* not very smart, but not altogether stupid movement */
- void m_normal_move(m)
- struct monster *m;
- {
- m_simple_move(m);
- }
-
-
- /* used by both m_normal_move and m_smart_move */
- void m_simple_move(m)
- struct monster *m;
- {
- int dx = sign(Player.x - m->x);
- int dy = sign(Player.y - m->y);
-
- erase_monster(m);
- if (m->hp < Monsters[m->id].hp/4) {
- dx = - dx;
- dy = - dy;
- m->movef = M_MOVE_SCAREDY;
- if (m->uniqueness == COMMON) {
- strcpy(Str2,"The ");
- strcat(Str2,m->monstring);
- }
- else strcpy(Str2,m->monstring);
- if (m->possessions != NULL) {
- strcat(Str2," drops its treasure and flees!");
- m_dropstuff(m);
- }
- else strcat(Str2," flees!");
- mprint(Str2);
- m->speed = min(2,m->speed-1);
- }
- if ((! m_statusp(m,HOSTILE) && !m_statusp(m, NEEDY)) ||
- (Player.status[INVISIBLE] > 0)) m_random_move(m);
- else {
- if (m_unblocked(m,m->x+dx,m->y+dy))
- movemonster(m,m->x+dx,m->y+dy);
- else if (dx == 0) {
- if (m_unblocked(m,m->x+1,m->y+dy))
- movemonster(m,m->x+1,m->y+dy);
- else if (m_unblocked(m,m->x-1,m->y+dy))
- movemonster(m,m->x-1,m->y+dy);
- }
-
- else if (dy == 0) {
- if (m_unblocked(m,m->x+dx,m->y+1))
- movemonster(m,m->x+dx,m->y+1);
- else if (m_unblocked(m,m->x+dx,m->y-1))
- movemonster(m,m->x+dx,m->y-1);
- }
-
- else {
- if (m_unblocked(m,m->x+dx,m->y))
- movemonster(m,m->x+dx,m->y);
- else if (m_unblocked(m,m->x,m->y+dy))
- movemonster(m,m->x,m->y+dy);
- }
- }
- }
-
-
-
-
- void m_move_animal(m)
- struct monster *m;
- {
- if (m_statusp(m,HOSTILE))
- m_normal_move(m);
- else m_scaredy_move(m);
- }
-
-
-
-
- /* same as simple move except run in opposite direction */
- void m_scaredy_move(m)
- struct monster *m;
- {
- int dx = -sign(Player.x - m->x);
- int dy = -sign(Player.y - m->y);
- erase_monster(m);
- if (Player.status[INVISIBLE]) m_random_move(m);
- else {
- if (m_unblocked(m,m->x+dx,m->y+dy))
- movemonster(m,m->x+dx,m->y+dy);
- else if (dx == 0) {
- if (m_unblocked(m,m->x+1,m->y+dy))
- movemonster(m,m->x+1,m->y+dy);
- else if (m_unblocked(m,m->x-1,m->y+dy))
- movemonster(m,m->x-1,m->y+dy);
- }
-
- else if (dy == 0) {
- if (m_unblocked(m,m->x+dx,m->y+1))
- movemonster(m,m->x+dx,m->y+1);
- else if (m_unblocked(m,m->x+dx,m->y-1))
- movemonster(m,m->x+dx,m->y-1);
- }
-
- else {
- if (m_unblocked(m,m->x+dx,m->y))
- movemonster(m,m->x+dx,m->y);
- else if (m_unblocked(m,m->x,m->y+dy))
- movemonster(m,m->x,m->y+dy);
- }
- }
- }
-
-
-
-
-
-
- /* for spirits (and earth creatures) who can ignore blockages because
- either they are noncorporeal or they can move through stone */
- void m_spirit_move(m)
- struct monster *m;
- {
- int dx = sign(Player.x - m->x);
- int dy = sign(Player.y - m->y);
- erase_monster(m);
- if (m->hp < Monsters[m->id].hp/6) {
- dx = -dx;
- dy = -dy;
- }
-
- if (Player.status[INVISIBLE] > 0 || !m_unblocked(m, m->x+dx, m->y+dy))
- m_random_move(m);
- else
- movemonster(m,m->x+dx,m->y+dy);
- }
-
-
-
- /* fluttery dumb movement */
- void m_flutter_move(m)
- struct monster *m;
- {
- int trange,range = distance(m->x,m->y,Player.x,Player.y);
- int i,tx,ty,nx=m->x,ny=m->y;
- erase_monster(m);
- if (Player.status[INVISIBLE] > 0) m_random_move(m);
- else {
- for (i=0;i<8;i++) {
- tx = m->x+Dirs[0][i];
- ty = m->y+Dirs[1][i];
- trange = distance(tx,ty,Player.x,Player.y);
- if (m->hp < Monsters[m->id].hp/6) {
- if ((trange > range) && m_unblocked(m,tx,ty)) {
- range = trange;
- nx = tx;
- ny = ty;
- }
- }
- else if ((trange <= range) && m_unblocked(m,tx,ty)) {
- range = trange;
- nx = tx;
- ny = ty;
- }
- }
- movemonster(m,nx,ny);
- }
- }
-
-
- void m_follow_move(m)
- struct monster *m;
- {
- if (! m_statusp(m,HOSTILE))
- m_normal_move(m);
- else m_scaredy_move(m);
- }
-
-
-
- /* allows monsters to fall into pools, revealed traps, etc */
- void m_confused_move(m)
- struct monster *m;
- {
- int i,nx,ny,done=FALSE;
- erase_monster(m);
- for (i=0;((i<8)&&(! done));i++) {
- nx = m->x+random_range(3)-1;
- ny = m->y+random_range(3)-1;
- if (unblocked(nx,ny) &&
- ((nx != Player.x) ||
- (ny != Player.y))) {
- done = TRUE;
- movemonster(m,nx,ny);
- }
- }
- }
-
- void m_random_move(m)
- struct monster *m;
- {
- int i,nx,ny,done=FALSE;
- erase_monster(m);
- for (i=0;((i<8)&&(! done));i++) {
- nx = m->x+random_range(3)-1;
- ny = m->y+random_range(3)-1;
- if (m_unblocked(m,nx,ny) &&
- ((nx != Player.x) ||
- (ny != Player.y))) {
- done = TRUE;
- movemonster(m,nx,ny);
- }
- }
- }
-
-
- /* monster removed from play */
- void m_vanish(m)
- struct monster *m;
- {
- if (m->uniqueness == COMMON) {
- strcpy(Str2,"The ");
- strcat(Str2,m->monstring);
- }
- else strcpy(Str2,m->monstring);
- strcat(Str2," vanishes in the twinkling of an eye!");
- mprint(Str2);
- Level->site[m->x][m->y].creature = NULL;
- erase_monster(m);
- m->hp = -1; /* signals "death" -- no credit to payer, though */
- }
-
- /* monster still in play */
- void m_teleport(m)
- struct monster *m;
- {
- erase_monster(m);
- if (m_statusp(m,AWAKE)) {
- Level->site[m->x][m->y].creature = NULL;
- putspot(m->x,m->y,getspot(m->x,m->y,FALSE));
- findspace(&(m->x),&(m->y),-1);
- Level->site[m->x][m->y].creature = m;
- }
- }
-
- void m_move_leash(m)
- struct monster *m;
- {
- m_simple_move(m);
- if (m->aux1 == 0) {
- m->aux1 = m->x;
- m->aux2 = m->y;
- }
- else if (distance(m->x,m->y,m->aux1,m->aux2) > 5) {
- if (Level->site[m->aux1][m->aux2].creature != NULL) {
- /* some other monster is where the chain starts */
- if (Level->site[m->aux1][m->aux2].creature->uniqueness == COMMON) {
- strcpy(Str1, "The ");
- strcat(Str1, Level->site[m->aux1][m->aux2].creature->monstring);
- }
- else
- strcpy(Str1, Level->site[m->aux1][m->aux2].creature->monstring);
- strcat(Str1, " releases the dog's chain!");
- mprint(Str1);
- m->movef = M_MOVE_NORMAL;
- m->aux1 = m->x;
- m->aux2 = m->y;
- /* otherwise, we'd lose either the dog or the other monster. */
- }
- else if (los_p(Player.x,Player.y,m->x,m->y)) {
- mprint("You see the dog jerked back by its chain!");
- plotspot(m->x, m->y, FALSE);
- }
- else mprint("You hear a strangled sort of yelp!");
- Level->site[m->x][m->y].creature = NULL;
- m->x = m->aux1;
- m->y = m->aux2;
- Level->site[m->x][m->y].creature = m;
- }
- }
-