--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/rotate.c	Sun Sep 14 18:51:16 2008 +0800
@@ -0,0 +1,119 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include "animate.h"
+
+static float comp_mb_timeval_ratio(const mb_timeval_t *a,
+				   const mb_timeval_t *b) {
+    float ratio;
+
+    ratio = (float)MB_TIMEVAL_SEC(a) * 1000000.0 + (float)MB_TIMEVAL_USEC(a);
+    ratio /= (float)MB_TIMEVAL_SEC(b) * 1000000.0 + (float)MB_TIMEVAL_USEC(b);
+    return ratio;
+}
+
+/*! \brief Animation action to rotate a coordinate.
+ */
+struct _mb_rotate {
+    mb_action_t action;
+
+    co_aix angle1, angle2;
+    coord_t *coord;
+
+    mb_timeval_t start_time;
+    const mb_timeval_t *playing_time;
+};
+typedef struct _mb_rotate mb_rotate_t;
+
+static void mb_rotate_start(mb_action_t *act,
+			   const mb_timeval_t *now,
+			   const mb_timeval_t *playing_time,
+			   redraw_man_t *rdman) {
+    mb_rotate_t *rotate = (mb_rotate_t *)act;
+    co_aix *matrix;
+    float _sin, _cos;
+
+    _sin = sinf(rotate->angle1);
+    _cos = cosf(rotate->angle1);
+
+    matrix = rotate->coord->matrix;
+    memset(matrix, 0, sizeof(co_aix) * 6);
+    matrix[0] = _cos;
+    matrix[1] = -_sin;
+    matrix[3] = _sin;
+    matrix[4] = _cos;
+    rdman_coord_changed(rdman, rotate->coord);
+
+    MB_TIMEVAL_CP(&rotate->start_time, now);
+    rotate->playing_time = playing_time;
+}
+
+static void mb_rotate_step(mb_action_t *act, const mb_timeval_t *now,
+			   redraw_man_t *rdman) {
+    mb_rotate_t *rotate = (mb_rotate_t *)act;
+    mb_timeval_t diff;
+    co_aix *matrix;
+    float ratio;
+    float angle;
+    float _sin, _cos;
+
+    MB_TIMEVAL_CP(&diff, now);
+    MB_TIMEVAL_DIFF(&diff, &rotate->start_time);
+    ratio = comp_mb_timeval_ratio(&diff, rotate->playing_time);
+
+    angle = rotate->angle1 * (1 - ratio) + rotate->angle2 * ratio;
+    _sin = sinf(angle);
+    _cos = cosf(angle);
+
+    matrix = rotate->coord->matrix;
+    matrix[0] = _cos;
+    matrix[1] = -_sin;
+    matrix[3] = _sin;
+    matrix[4] = _cos;
+    rdman_coord_changed(rdman, rotate->coord);
+}
+
+static void mb_rotate_stop(mb_action_t *act, const mb_timeval_t *now,
+			   redraw_man_t *rdman) {
+    mb_rotate_t *rotate = (mb_rotate_t *)act;
+    co_aix *matrix;
+    float _sin, _cos;
+
+    _sin = sinf(rotate->angle2);
+    _cos = cosf(rotate->angle2);
+
+    matrix = rotate->coord->matrix;
+    matrix[0] = _cos;
+    matrix[1] = -_sin;
+    matrix[3] = _sin;
+    matrix[4] = _cos;
+    rdman_coord_changed(rdman, rotate->coord);
+}
+
+static void mb_rotate_free(mb_action_t *act) {
+    free(act);
+}
+
+mb_action_t *mb_rotate_new(float angle1, float angle2,
+			   coord_t *coord,
+			   mb_word_t *word) {
+    mb_rotate_t *rotate;
+
+    rotate = (mb_rotate_t *)malloc(sizeof(mb_rotate_t));
+    if(rotate == NULL)
+	return NULL;
+
+    rotate->angle1 = angle1;
+    rotate->angle2 = angle2;
+    rotate->coord = coord;
+
+    rotate->action.start = mb_rotate_start;
+    rotate->action.step = mb_rotate_step;
+    rotate->action.stop = mb_rotate_stop;
+    rotate->action.free = mb_rotate_free;
+
+    mb_word_add_action(word, (mb_action_t *)rotate);
+
+    return (mb_action_t *)rotate;
+}