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annotate src/animation.c @ 41:3996f873a54b

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core: implement walksprite, closes #2455
author David Demelier <markand@malikania.fr>
date Wed, 15 Jan 2020 13:11:47 +0100
parents 66f318fd97a0
children b815621df3e3
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7
fbb7101b7bd8 core: implement animations, closes #2439
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1 /*
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2 * animation.c -- basic animations
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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
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21 #include "animation.h"
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22 #include "sprite.h"
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23
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24 void
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25 animation_init(struct animation *an, struct sprite *sprite, uint16_t delay)
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26 {
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27 assert(an);
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28 assert(sprite);
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29
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30 an->sprite = sprite;
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31 an->row = 0;
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32 an->column = 0;
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33 an->delay = delay;
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34 an->elapsed = 0;
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35 }
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36
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37 bool
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38 animation_is_complete(const struct animation *an)
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39 {
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40 assert(an);
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41
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42 return an->row == an->sprite->nrows &&
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43 an->column == an->sprite->ncols &&
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44 an->elapsed >= an->delay;
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45 }
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46
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47 void
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48 animation_start(struct animation *an)
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49 {
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50 assert(an);
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51
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52 an->row = 0;
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53 an->column = 0;
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54 an->elapsed = 0;
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55 }
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56
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57 void
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58 animation_update(struct animation *an, unsigned ticks)
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59 {
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60 assert(an);
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61
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62 an->elapsed += ticks;
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63
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64 if (an->elapsed < an->delay)
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65 return;
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66
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67 /* Increment column first */
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68 if (++an->column >= an->sprite->ncols) {
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69 /*
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70 * Increment row, if we reach the last row it means we are
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71 * at the last frame.
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72 */
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73 if (++an->row >= an->sprite->nrows)
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74 an->row = an->sprite->nrows;
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75 else
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76 an->column = 0;
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77 }
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78 }
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79
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80 void
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81 animation_draw(struct animation *an, int x, int y)
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82 {
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83 sprite_draw(an->sprite, an->row, an->column, x, y);
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84 }