Mercurial > MadButterfly

annotate src/shift.c @ 1395:a768d74e5f49

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Fix the svg:use. For a svg:use, it is a group which include the content it reference. It means that we can not tween it to its origin object directly. Instead, we need to ungroup it and then use the result matrix to generate the tweened transformation matrix. Therefore, we need to concate its matrix to the referenced object. Ad center object when the bbox-x is not available.
author wycc
date Sat, 02 Apr 2011 05:36:36 +0800
parents 586e50f82c1f
children
rev   line source
822
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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 <string.h>
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6 #include "mb_animate.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_shift mb_shift_t;
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18 /*! \brief Animation action for relative shift a coordination. */
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19 struct _mb_shift {
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20 mb_action_t action;
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21
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22 co_aix x, y;
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23 coord_t *coord;
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24
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25 mb_timeval_t start_time;
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26 co_aix saved_matrix[6];
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27 const mb_timeval_t *playing_time;
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28 };
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29
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30 static void mb_shift_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_shift_t *shift = (mb_shift_t *)act;
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35 coord_t *coord;
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36
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37 MB_TIMEVAL_CP(&shift->start_time, now);
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38 coord = shift->coord;
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39 memcpy(&shift->saved_matrix, coord->matrix, sizeof(co_aix[6]));
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40 shift->playing_time = playing_time;
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41 }
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42
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43 static void mb_shift_step(mb_action_t *act, const mb_timeval_t *now,
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44 redraw_man_t *rdman) {
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45 mb_shift_t *shift = (mb_shift_t *)act;
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46 mb_timeval_t diff;
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47 coord_t *coord;
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48 float ratio;
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49
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parents: 194
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50
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51 MB_TIMEVAL_CP(&diff, now);
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52 MB_TIMEVAL_DIFF(&diff, &shift->start_time);
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53 ratio = comp_mb_timeval_ratio(&diff, shift->playing_time);
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54
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55 coord = shift->coord;
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56 coord->matrix[2] = shift->saved_matrix[2] + shift->x * ratio;
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57 coord->matrix[5] = shift->saved_matrix[5] + shift->y * ratio;
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58
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59 rdman_coord_changed(rdman, coord);
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60 }
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61
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62 static void mb_shift_stop(mb_action_t *act, const mb_timeval_t *now,
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63 redraw_man_t *rdman) {
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64 mb_shift_t *shift = (mb_shift_t *)act;
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65 coord_t *coord;
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66
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67 coord = shift->coord;
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68 coord->matrix[2] = shift->saved_matrix[2] + shift->x;
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69 coord->matrix[5] = shift->saved_matrix[5] + shift->y;
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70
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71 rdman_coord_changed(rdman, coord);
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72 }
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73
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74
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75 static void mb_shift_free(mb_action_t *act) {
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76 free(act);
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77 }
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78
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79 mb_action_t *mb_shift_new(co_aix x, co_aix y, coord_t *coord,
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80 mb_word_t *word) {
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81 mb_shift_t *shift;
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82
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83 shift = (mb_shift_t *)malloc(sizeof(mb_shift_t));
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84 if(shift == NULL)
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85 return NULL;
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86
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87 shift->x = x;
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88 shift->y = y;
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89 shift->coord = coord;
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90
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91 shift->action.start = mb_shift_start;
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92 shift->action.step = mb_shift_step;
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93 shift->action.stop = mb_shift_stop;
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94 shift->action.free = mb_shift_free;
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95
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96 /*! \note mb_shift_new() will add itself to the specified word. */
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97 mb_word_add_action(word, (mb_action_t *)shift);
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98
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99 return (mb_action_t *)shift;
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100 }