Mercurial > MadButterfly

annotate src/chgcolor.c @ 1167:6160e6282252

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The object is duplicated inside the tween generator.
author wycc
date Thu, 30 Dec 2010 11:11:34 +0800
parents 586e50f82c1f
children
rev   line source
822
586e50f82c1f Unify coding style tag for emacs and vim.
Shih-Yuan Lee (FourDollars) <fourdollars@gmail.com>
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1 // -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
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2 // vim: sw=4:ts=8:sts=4
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3 #include <stdio.h>
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4 #include <stdlib.h>
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5 #include "mb_animate.h"
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6 #include "mb_paint.h"
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7
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8 static float comp_mb_timeval_ratio(const mb_timeval_t *a,
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9 const mb_timeval_t *b) {
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10 float ratio;
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11
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12 ratio = (float)MB_TIMEVAL_SEC(a) * 1000000.0 + (float)MB_TIMEVAL_USEC(a);
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13 ratio /= (float)MB_TIMEVAL_SEC(b) * 1000000.0 + (float)MB_TIMEVAL_USEC(b);
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14 return ratio;
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15 }
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16
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17 typedef struct _mb_chgcolor mb_chgcolor_t;
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18
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19 struct _mb_chgcolor {
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20 mb_action_t action;
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21
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22 co_comp_t r, g, b, a;
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23 paint_t *paint;
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24
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25 mb_timeval_t start_time;
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26 const mb_timeval_t *playing_time;
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27 co_comp_t s_r, s_g, s_b, s_a; /*!< saved RGBA values. */
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28 };
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29
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30 static void mb_chgcolor_start(mb_action_t *act,
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31 const mb_timeval_t *now,
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32 const mb_timeval_t *playing_time,
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33 redraw_man_t *rdman) {
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34 mb_chgcolor_t *chg = (mb_chgcolor_t *)act;
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35
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36 MB_TIMEVAL_CP(&chg->start_time, now);
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37 chg->playing_time = playing_time; /* playing_time is in word,
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38 * it live time is as long as
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39 * actions. */
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40 paint_color_get(chg->paint,
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41 &chg->s_r, &chg->s_g,
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42 &chg->s_b, &chg->s_a);
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43 }
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44
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45 static void mb_chgcolor_step(mb_action_t *act,
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46 const mb_timeval_t *now,
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47 redraw_man_t *rdman) {
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48 mb_chgcolor_t *chg = (mb_chgcolor_t *)act;
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49 mb_timeval_t diff;
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50 co_comp_t r, g, b, a;
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51 float ratio, comp;
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52
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53 MB_TIMEVAL_CP(&diff, now);
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54 MB_TIMEVAL_DIFF(&diff, &chg->start_time);
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55 ratio = comp_mb_timeval_ratio(&diff, chg->playing_time);
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56 comp = 1 - ratio;
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57
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58 r = chg->s_r * comp + ratio * chg->r;
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59 g = chg->s_g * comp + ratio * chg->g;
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60 b = chg->s_b * comp + ratio * chg->b;
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61 a = chg->s_a * comp + ratio * chg->a;
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62 paint_color_set(chg->paint, r, g, b, a);
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63
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64 rdman_paint_changed(rdman, chg->paint);
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65 }
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66
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67 static void mb_chgcolor_stop(mb_action_t *act,
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68 const mb_timeval_t *now,
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69 redraw_man_t *rdman) {
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70 mb_chgcolor_t *chg = (mb_chgcolor_t *)act;
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71
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72 paint_color_set(chg->paint, chg->r, chg->g, chg->b, chg->a);
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73
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74 rdman_paint_changed(rdman, chg->paint);
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75 }
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76
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77 static void mb_chgcolor_free(mb_action_t *act) {
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78 free(act);
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79 }
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80
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81 mb_action_t *mb_chgcolor_new(co_comp_t r, co_comp_t g,
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82 co_comp_t b, co_comp_t a,
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83 paint_t *paint, mb_word_t *word) {
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84 mb_chgcolor_t *chg;
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85
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86 chg = (mb_chgcolor_t *)malloc(sizeof(mb_chgcolor_t));
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87 if(chg == NULL)
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88 return NULL;
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89
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90 chg->r = r;
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91 chg->g = g;
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92 chg->b = b;
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93 chg->a = a;
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94
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95 chg->paint = paint;
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96
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97 chg->action.start = mb_chgcolor_start;
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98 chg->action.step = mb_chgcolor_step;
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99 chg->action.stop = mb_chgcolor_stop;
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100 chg->action.free = mb_chgcolor_free;
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101
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102 mb_word_add_action(word, (mb_action_t *)chg);
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103
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104 return (mb_action_t *)chg;
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105 }
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106
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107