Mercurial > MadButterfly

annotate src/shift.c @ 880:ac3e8492ad74 abs_n_rel_center

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Formalize path data for MadButterfly. Inkscape and other editors would omit 'l' or 'L' after 'm' or 'M'. MadButterfly can not handle it, now. So, we work around it at SVG parser.
author Thinker K.F. Li <thinker@codemud.net>
date Sat, 25 Sep 2010 18:46:37 +0800
parents 586e50f82c1f
children
rev   line source
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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 <string.h>
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530bb7728546 Move header files to $(top_srcdir)/include/ and prefixed with 'mb_'.
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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 }