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annotate src/shift.c @ 1143:18d718a76a45

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Fix incorrect index of y-scale in the matrix
author Thinker K.F. Li <thinker@codemud.net>
date Fri, 24 Dec 2010 11:26:57 +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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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
822
586e50f82c1f Unify coding style tag for emacs and vim.
Shih-Yuan Lee (FourDollars) <fourdollars@gmail.com>
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 }