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annotate xrogue/chase.c @ 235:2dcf10d45d5b

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Rogue V4: add two more function declarations. Though it was called with different numbers of arguments, add_line() does not need to be a variadic function. Making the second argument mandatory is a better solution.
author John "Elwin" Edwards
date Mon, 07 Mar 2016 19:26:08 -0500
parents f54901b9c39b
children e52a8a7ad4c5
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1 /*
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2 chase.c - Code for one object to chase another
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3
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4 XRogue: Expeditions into the Dungeons of Doom
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5 Copyright (C) 1991 Robert Pietkivitch
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6 All rights reserved.
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7
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8 Based on "Advanced Rogue"
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9 Copyright (C) 1984, 1985 Michael Morgan, Ken Dalka and AT&T
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10 All rights reserved.
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11
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12 Based on "Rogue: Exploring the Dungeons of Doom"
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13 Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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14 All rights reserved.
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15
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16 See the file LICENSE.TXT for full copyright and licensing information.
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17 */
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18
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19 #include <ctype.h>
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20 #include <curses.h>
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21 #include <limits.h>
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22 #include <stdlib.h>
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23 #include "rogue.h"
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24
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25 bool straight_shot(int ery, int erx, int eey, int eex, coord *shooting);
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26
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27 /*
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28 * Canblink checks if the monster can teleport (blink). If so, it will
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29 * try to blink the monster next to the player.
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30 */
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31
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32 bool
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33 can_blink(struct thing *tp)
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34 {
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35 register int y, x, index=9;
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36 coord tryp; /* To hold the coordinates for use in diag_ok */
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37 bool spots[9], found_one=FALSE;
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38
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39 /*
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40 * First, can the monster even blink? And if so, there is only a 50%
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41 * chance that it will do so. And it won't blink if it is running or
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42 * held.
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43 */
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44 if (off(*tp, CANBLINK) || (on(*tp, ISHELD)) ||
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45 on(*tp, ISFLEE) ||
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46 tp->t_action == A_FREEZE ||
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47 (rnd(12) < 6)) return(FALSE);
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48
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49
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50 /* Initialize the spots as illegal */
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51 do {
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52 spots[--index] = FALSE;
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53 } while (index > 0);
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54
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55 /* Find a suitable spot next to the player */
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56 for (y=hero.y-1; y<hero.y+2; y++)
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57 for (x=hero.x-1; x<hero.x+2; x++, index++) {
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58 /* Make sure x coordinate is in range and that we are
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59 * not at the player's position
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60 */
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61 if (x<0 || x >= cols || index == 4) continue;
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62
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63 /* Is it OK to move there? */
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64 if (step_ok(y, x, NOMONST, tp) &&
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65 (!isatrap(mvwinch(cw, y, x)) ||
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66 rnd(10) >= tp->t_stats.s_intel ||
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67 on(*tp, ISFLY))) {
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68 /* OK, we can go here. But don't go there if
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69 * monster can't get at player from there
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70 */
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71 tryp.y = y;
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72 tryp.x = x;
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73 if (diag_ok(&tryp, &hero, tp)) {
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74 spots[index] = TRUE;
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75 found_one = TRUE;
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76 }
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77 }
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78 }
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79
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80 /* If we found one, go to it */
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81 if (found_one) {
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82 unsigned char rch; /* What's really where the creatures moves to */
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83
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84 /* Find a legal spot */
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85 while (spots[index=rnd(9)] == FALSE) continue;
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86
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87 /* Get the coordinates */
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88 y = hero.y + (index/3) - 1;
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89 x = hero.x + (index % 3) - 1;
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90
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91 /* Move the monster from the old space */
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