Mercurial > molko
annotate libmlk-adventure/adventure/actions/spawner.c @ 264:9bbbabb6f077
cmake: make macros simpler
author | David Demelier <markand@malikania.fr> |
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date | Wed, 09 Dec 2020 21:22:21 +0100 |
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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 = util_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 } |