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annotate libmlk-adventure/adventure/action/spawner.c @ 273:e28429dbdaaf

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adventure: uniform actions
author David Demelier <markand@malikania.fr>
date Sat, 12 Dec 2020 12:31:23 +0100
parents a49ae1b6ea4f
children f89a53abb314
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1 /*
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2 * spawner.c -- spawn battle while moving
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <math.h>
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21 #include <stdlib.h>
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22
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23 #include <core/alloc.h>
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24 #include <core/game.h>
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25 #include <core/util.h>
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26
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27 #include <rpg/map.h>
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28
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29 #include "spawner.h"
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31 static inline unsigned int
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32 distance(const struct spawner *s)
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33 {
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34 unsigned int gap_x = fmax(s->last_x, s->map->player_x) -
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35 fmin(s->last_x, s->map->player_x);
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36 unsigned int gap_y = fmax(s->last_y, s->map->player_y) -
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37 fmin(s->last_y, s->map->player_y);
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39 return fmin(s->steps, gap_x + gap_y);
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40 }
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41
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42 static bool
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43 update(struct action *act, unsigned int ticks)
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44 {
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45 (void)ticks;
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46
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47 struct spawner *s = act->data;
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49 if (s->map->player_movement) {
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50 s->steps -= distance(s);
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51 s->last_x = s->map->player_x;
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52 s->last_y = s->map->player_y;
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53
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54 if (s->steps == 0) {
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55 s->steps = util_nrand(s->low, s->high);
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56
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57 /* TODO: start battle here. */
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58 return false;
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59 }
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60 }
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61
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62 return false;
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63 }
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65 void
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66 spawner_init(struct spawner *s)
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67 {
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68 assert(s);
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69
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70 s->last_x = s->map->player_x;
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71 s->last_y = s->map->player_y;
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72 s->steps = util_nrand(s->low, s->high);
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73 }
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75 struct action *
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76 spawner_new(struct spawner *s)
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77 {
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78 assert(s);
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79
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80 s->action.data = s;
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81 s->action.update = update;
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82
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83 return &s->action;
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84 }