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annotate libmlk-adventure/adventure/actions/spawner.c @ 260:60a214ec1ab4

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adventure: change the way states are stored
author David Demelier <markand@malikania.fr>
date Sun, 06 Dec 2020 22:50:48 +0100
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children bfde372bf152
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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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30
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31 struct self {
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32 struct action action;
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33 struct map *map;
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34 int last_x;
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35 int last_y;
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36 unsigned int steps;
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37 };
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38
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39 static inline unsigned int
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40 distance(const struct self *self)
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41 {
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42 unsigned int gap_x = fmax(self->last_x, self->map->player_x) -
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43 fmin(self->last_x, self->map->player_x);
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44 unsigned int gap_y = fmax(self->last_y, self->map->player_y) -
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45 fmin(self->last_y, self->map->player_y);
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46
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47 return fmin(self->steps, gap_x + gap_y);
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48 }
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49
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50 static bool
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51 update(struct action *act, unsigned int ticks)
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52 {
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53 (void)ticks;
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54
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55 struct self *self = act->data;
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56
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57 if (self->map->player_movement) {
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58 self->steps -= distance(self);
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59 self->last_x = self->map->player_x;
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60 self->last_y = self->map->player_y;
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61
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62 if (self->steps == 0) {
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63 /* TODO: start battle here. */
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64 return false;
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65 }
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66 }
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67
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68 return false;
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69 }
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70
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71 static void
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72 finish(struct action *act)
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73 {
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74 free(act->data);
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75 }
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76
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77 struct action *
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78 spawner_new(struct map *map, unsigned int low, unsigned int high)
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79 {
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80 assert(map);
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81
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82 struct self *self;
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83
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84 self = alloc_new0(sizeof (*self));
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85 self->map = map;
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86 self->last_x = map->player_x;
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87 self->last_y = map->player_y;
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88 self->steps = nrand(low, high);
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89
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90 self->action.data = self;
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91 self->action.update = update;
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92 self->action.finish = finish;
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93
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94 return &self->action;
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95 }