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annotate rogue4/chase.c @ 255:69ffcb6b90da

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Merge the bugfix branch, which had missed an update.
author John "Elwin" Edwards
date Fri, 10 Feb 2017 09:06:50 -0500
parents 1b73a8641b37
children e52a8a7ad4c5
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1 /*
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2 * Code for one creature to chase another
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3 *
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4 * @(#)chase.c 4.25 (Berkeley) 5/5/82
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5 *
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6 * Rogue: Exploring the Dungeons of Doom
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7 * Copyright (C) 1980, 1981, 1982 Michael Toy, Ken Arnold and Glenn Wichman
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8 * All rights reserved.
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9 *
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10 * See the file LICENSE.TXT for full copyright and licensing information.
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11 */
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12
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13 #include <stdlib.h>
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14 #include <curses.h>
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15 #include "rogue.h"
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16
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17 #define DRAGONSHOT 5 /* one chance in DRAGONSHOT that a dragon will flame */
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18
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19 coord ch_ret; /* Where chasing takes you */
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20
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21 bool chase(THING *tp, coord *ee);
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22 int do_chase(THING *th);
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23 coord *find_dest(THING *tp);
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24
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25 /*
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26 * runners:
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27 * Make all the running monsters move.
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28 */
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29 void
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30 runners(void)
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31 {
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32 register THING *tp;
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33 register THING *ntp;
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34
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35 for (tp = mlist; tp != NULL; tp = ntp)
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36 {
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37 ntp = next(tp);
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38 if (!on(*tp, ISHELD) && on(*tp, ISRUN))
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39 {
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40 if (!on(*tp, ISSLOW) || tp->t_turn)
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41 if (do_chase(tp) == -1)
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42 continue;
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43 if (on(*tp, ISHASTE))
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44 if (do_chase(tp) == -1)
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45 continue;
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46 tp->t_turn ^= TRUE;
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47 }
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48 }
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49 }
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50
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51 /*
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52 * do_chase:
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53 * Make one thing chase another.
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54 */
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55 int
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56 do_chase(THING *th)
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57 {
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58 register struct room *rer, *ree; /* room of chaser, room of chasee */
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59 register int mindist = 32767, i, dist;
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60 register bool stoprun = FALSE; /* TRUE means we are there */
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61 register char sch;
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62 register bool door;
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63 register THING *obj;
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64 register struct room *oroom;
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65 coord this; /* Temporary destination for chaser */
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66
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67 rer = th->t_room; /* Find room of chaser */
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68 if (on(*th, ISGREED) && rer->r_goldval == 0)
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69 th->t_dest = &hero; /* If gold has been taken, run after hero */
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70 if (th->t_dest == &hero) /* Find room of chasee */
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71 ree = proom;
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72 else
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73 ree = roomin(th->t_dest);
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74 /*
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75 * We don't count doors as inside rooms for this routine
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76 */
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77 door = (chat(th->t_pos.y, th->t_pos.x) == DOOR);
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78 /*
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79 * If the object of our desire is in a different room,
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80 * and we are not in a corridor, run to the door nearest to
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81 * our goal.
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82 */
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83 over:
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84 if (rer != ree)
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85 {
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86 for (i = 0; i < rer->r_nexits; i++) /* loop through doors */
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87 {
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88 dist = DISTANCE(th->t_dest->y, th->t_dest->x,
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89 rer->r_exit[i].y, rer->r_exit[i].x);
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90 if (dist < mindist)
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91 {
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92 this = rer->r_exit[i];
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93 mindist = dist;
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94 }
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95 }
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96 if (door)
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97 {
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98 rer = &passages[flat(th->t_pos.y, th->t_pos.x) & F_PNUM];
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99 door = FALSE;
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100 goto over;
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101 }
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102 }
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103 else