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core: implement animations, closes #2439
author David Demelier <markand@malikania.fr>
date Mon, 06 Jan 2020 21:39:16 +0100
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children 5519ad48822e
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7
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1 /*
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2 * animation.h -- 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 #ifndef MOLKO_ANIMATION_H
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20 #define MOLKO_ANIMATION_H
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21
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22 /**
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23 * \file animation.h
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24 * \brief Basic animations.
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25 */
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26
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27 #include <stdbool.h>
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28 #include <stdint.h>
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29
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30 struct sprite;
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31
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32 /**
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33 * \brief Animation object
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34 */
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35 struct animation {
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36 struct sprite *sprite; /* Sprite to use (RW) */
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37 uint16_t row; /* current row (RO) */
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38 uint16_t column; /* current column (RO) */
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39 uint16_t delay; /* delay between frames (RW) */
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40 uint16_t elapsed; /* elapsed time since last frame (RO) */
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41 };
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42
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43 /**
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44 * Initialize the animation.
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45 *
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46 * The animation does not take sprite ownership, it must be valid until
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47 * animation is no longer used.
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48 *
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49 * \pre an != NULL
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50 * \pre sprite != NULL
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51 * \param an the animation
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52 * \param sprite the sprite to use
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53 * \param delay the delay between frames in milliseconds
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54 */
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55 void
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56 animation_init(struct animation *an, struct sprite *sprite, uint16_t delay);
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57
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58 /**
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59 * Tells if the animation is complete.
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60 *
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61 * \pre an != NULL
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62 * \param an the animation
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63 * \return true if the animation has completed
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64 */
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65 bool
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66 animation_is_complete(const struct animation *an);
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67
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68 /**
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69 * Start an animation.
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70 *
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71 * \pre an != NULL
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72 * \param an the animation
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73 */
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74 void
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75 animation_start(struct animation *an);
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76
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77 /**
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78 * Update the animation.
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79 *
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80 * You must call this function at each loop iteration to update the animation
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81 * frame depending on its delay.
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82 *
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83 * \pre an != NULL
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84 * \param an the animation
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85 * \param ticks the elapsed ticks since the last call
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86 */
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87 void
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88 animation_update(struct animation *an, unsigned ticks);
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89
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90 /**
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91 * Draw the animation.
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92 *
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93 * \pre an != NULL
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94 * \param an the animation
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95 * \param x the X coordinate
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96 * \param y the Y coordinate
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97 */
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98 void
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99 animation_draw(struct animation *an, int x, int y);
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100
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101 #endif /* !MOLKO_ANIMATION_H */