Mercurial > MadButterfly

annotate src/shift.c @ 501:e505597c17fb Android_Skia

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testpath is an Android Java application for demo MadButterfly.
author Thinker K.F. Li <thinker@branda.to>
date Tue, 01 Dec 2009 22:55:08 +0800
parents 45d9a1e2764d
children 586e50f82c1f
rev   line source
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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530bb7728546 Move header files to $(top_srcdir)/include/ and prefixed with 'mb_'.
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4 #include "mb_animate.h"
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5
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6 static float comp_mb_timeval_ratio(const mb_timeval_t *a,
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7 const mb_timeval_t *b) {
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8 float ratio;
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9
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10 ratio = (float)MB_TIMEVAL_SEC(a) * 1000000.0 + (float)MB_TIMEVAL_USEC(a);
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11 ratio /= (float)MB_TIMEVAL_SEC(b) * 1000000.0 + (float)MB_TIMEVAL_USEC(b);
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12 return ratio;
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13 }
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14
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15 typedef struct _mb_shift mb_shift_t;
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16 /*! \brief Animation action for relative shift a coordination. */
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17 struct _mb_shift {
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18 mb_action_t action;
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19
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20 co_aix x, y;
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21 coord_t *coord;
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22
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23 mb_timeval_t start_time;
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24 co_aix saved_matrix[6];
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25 const mb_timeval_t *playing_time;
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26 };
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27
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28 static void mb_shift_start(mb_action_t *act,
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29 const mb_timeval_t *now,
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30 const mb_timeval_t *playing_time,
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31 redraw_man_t *rdman) {
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32 mb_shift_t *shift = (mb_shift_t *)act;
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33 coord_t *coord;
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34
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35 MB_TIMEVAL_CP(&shift->start_time, now);
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36 coord = shift->coord;
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37 memcpy(&shift->saved_matrix, coord->matrix, sizeof(co_aix[6]));
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38 shift->playing_time = playing_time;
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39 }
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40
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41 static void mb_shift_step(mb_action_t *act, const mb_timeval_t *now,
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42 redraw_man_t *rdman) {
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43 mb_shift_t *shift = (mb_shift_t *)act;
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44 mb_timeval_t diff;
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45 coord_t *coord;
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46 float ratio;
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47
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48
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49 MB_TIMEVAL_CP(&diff, now);
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50 MB_TIMEVAL_DIFF(&diff, &shift->start_time);
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51 ratio = comp_mb_timeval_ratio(&diff, shift->playing_time);
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52
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53 coord = shift->coord;
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54 coord->matrix[2] = shift->saved_matrix[2] + shift->x * ratio;
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55 coord->matrix[5] = shift->saved_matrix[5] + shift->y * ratio;
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56
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57 rdman_coord_changed(rdman, coord);
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58 }
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59
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60 static void mb_shift_stop(mb_action_t *act, const mb_timeval_t *now,
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61 redraw_man_t *rdman) {
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62 mb_shift_t *shift = (mb_shift_t *)act;
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63 coord_t *coord;
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64
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65 coord = shift->coord;
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66 coord->matrix[2] = shift->saved_matrix[2] + shift->x;
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67 coord->matrix[5] = shift->saved_matrix[5] + shift->y;
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68
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69 rdman_coord_changed(rdman, coord);
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70 }
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71
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72
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73 static void mb_shift_free(mb_action_t *act) {
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74 free(act);
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75 }
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76
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77 mb_action_t *mb_shift_new(co_aix x, co_aix y, coord_t *coord,
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78 mb_word_t *word) {
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79 mb_shift_t *shift;
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80
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81 shift = (mb_shift_t *)malloc(sizeof(mb_shift_t));
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82 if(shift == NULL)
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83 return NULL;
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84
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85 shift->x = x;
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86 shift->y = y;
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87 shift->coord = coord;
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88
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89 shift->action.start = mb_shift_start;
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90 shift->action.step = mb_shift_step;
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91 shift->action.stop = mb_shift_stop;
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92 shift->action.free = mb_shift_free;
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93
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94 /*! \note mb_shift_new() will add itself to the specified word. */
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95 mb_word_add_action(word, (mb_action_t *)shift);
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96
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97 return (mb_action_t *)shift;
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98 }