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annotate libmlk-rpg/rpg/battle-entity-state-moving.c @ 278:cc676046aac9

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core: add sprite_scale function
author David Demelier <markand@malikania.fr>
date Tue, 15 Dec 2020 22:06:32 +0100
parents 6367b976112d
children 196264679079
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1 /*
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2 * battle-entity-state-moving.c -- the entity is 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/panic.h>
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25
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26 #include "battle-entity.h"
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27 #include "battle-entity-state.h"
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28 #include "character.h"
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29 #include "walksprite.h"
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30
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31 #define SPEED 800
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32 #define SEC 1000
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33 #define WALK 40
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34
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35 struct position {
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36 struct battle_entity_state state;
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37 struct walksprite ws;
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38
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39 /* Destination. */
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40 int x;
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41 int y;
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42 };
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43
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44 static inline unsigned int
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45 orientation(const struct position *pos, const struct battle_entity *et)
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46 {
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47 /* TODO: support diagonal. */
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48 /* See: walksprite definitions. */
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49 return pos->x < et->x ? 6 : 2;
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50 }
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51
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52 static bool
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53 update(struct battle_entity_state *st, struct battle_entity *et, unsigned int ticks)
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54 {
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55 struct position *pos = st->data;
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56 int step_x, step_y, delta_x, delta_y;
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57
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58 delta_x = pos->x < et->x ? -1 : +1;
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59 delta_y = pos->y < et->y ? -1 : +1;
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60 step_x = fmin(SPEED * ticks / SEC, abs(et->x - pos->x));
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61 step_y = fmin(SPEED * ticks / SEC, abs(et->y - pos->y));
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62
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63 et->x += delta_x * step_x;
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64 et->y += delta_y * step_y;
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65
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66 if (et->x != pos->x || et->y != pos->y)
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67 walksprite_update(&pos->ws, ticks);
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68 else
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69 walksprite_reset(&pos->ws);
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70
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71 return et->x == pos->x && et->y == pos->y;
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72 }
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73
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74 static void
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75 draw(const struct battle_entity_state *st, const struct battle_entity *et)
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76 {
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77 /* TODO: compute orientation. */
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78 struct position *pos = st->data;
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79
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80 walksprite_draw(&pos->ws, orientation(pos, et), et->x, et->y);
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81 }
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82
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83 static void
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84 finish(struct battle_entity_state *st, struct battle_entity *et)
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85 {
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86 (void)et;
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87
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88 free(st->data);
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89 }
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90
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91 void
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92 battle_entity_state_moving(struct battle_entity *et, int destx, int desty)
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93 {
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94 assert(et);
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95
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96 struct position *pos;
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97
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98 if (!(pos = alloc_new0(sizeof (*pos))))
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99 panic();
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100
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101 walksprite_init(&pos->ws, et->ch->sprites[CHARACTER_SPRITE_NORMAL], 40);
230
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102 pos->x = destx;
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103 pos->y = desty;
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104
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105 pos->state.data = pos;
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106 pos->state.update = update;
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107 pos->state.draw = draw;
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108 pos->state.finish = finish;
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109
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110 battle_entity_switch(et, &pos->state);
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111 }