view src/shift.c @ 1401:2fc1f54a1a3b

Mainly fix the clone_from_subtree to update the children of the parent node. We need to clearify all related codes in the future to make the logic more clear.
author wycc
date Sun, 03 Apr 2011 18:12:42 +0800
parents 586e50f82c1f
children
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// -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
// vim: sw=4:ts=8:sts=4
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mb_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;
}

typedef struct _mb_shift mb_shift_t;
/*! \brief Animation action for relative shift a coordination. */
struct _mb_shift {
    mb_action_t action;

    co_aix x, y;
    coord_t *coord;

    mb_timeval_t start_time;
    co_aix saved_matrix[6];
    const mb_timeval_t *playing_time;
};

static void mb_shift_start(mb_action_t *act,
			   const mb_timeval_t *now,
			   const mb_timeval_t *playing_time,
			   redraw_man_t *rdman) {
    mb_shift_t *shift = (mb_shift_t *)act;
    coord_t *coord;

    MB_TIMEVAL_CP(&shift->start_time, now);
    coord = shift->coord;
    memcpy(&shift->saved_matrix, coord->matrix, sizeof(co_aix[6]));
    shift->playing_time = playing_time;
}

static void mb_shift_step(mb_action_t *act, const mb_timeval_t *now,
			  redraw_man_t *rdman) {
    mb_shift_t *shift = (mb_shift_t *)act;
    mb_timeval_t diff;
    coord_t *coord;
    float ratio;


    MB_TIMEVAL_CP(&diff, now);
    MB_TIMEVAL_DIFF(&diff, &shift->start_time);
    ratio = comp_mb_timeval_ratio(&diff, shift->playing_time);

    coord = shift->coord;
    coord->matrix[2] = shift->saved_matrix[2] + shift->x * ratio;
    coord->matrix[5] = shift->saved_matrix[5] + shift->y * ratio;

    rdman_coord_changed(rdman, coord);
}

static void mb_shift_stop(mb_action_t *act, const mb_timeval_t *now,
			  redraw_man_t *rdman) {
    mb_shift_t *shift = (mb_shift_t *)act;
    coord_t *coord;

    coord = shift->coord;
    coord->matrix[2] = shift->saved_matrix[2] + shift->x;
    coord->matrix[5] = shift->saved_matrix[5] + shift->y;

    rdman_coord_changed(rdman, coord);
}


static void mb_shift_free(mb_action_t *act) {
    free(act);
}

mb_action_t *mb_shift_new(co_aix x, co_aix y, coord_t *coord,
			  mb_word_t *word) {
    mb_shift_t *shift;

    shift = (mb_shift_t *)malloc(sizeof(mb_shift_t));
    if(shift == NULL)
	return NULL;

    shift->x = x;
    shift->y = y;
    shift->coord = coord;

    shift->action.start = mb_shift_start;
    shift->action.step = mb_shift_step;
    shift->action.stop = mb_shift_stop;
    shift->action.free = mb_shift_free;

    /*! \note mb_shift_new() will add itself to the specified word. */
    mb_word_add_action(word, (mb_action_t *)shift);

    return (mb_action_t *)shift;
}