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Fixed clutter_sine_inc_func(); added clutter_sine_dec_func()

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This commit is contained in:
Tomas Frydrych
2007-05-16 13:46:54 +00:00
parent 9dfe31a542
commit 9a10979e0f
4 changed files with 69 additions and 8 deletions
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59
clutter/clutter-alpha.c
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@ -603,8 +603,9 @@ clutter_sine_func (ClutterAlpha *alpha,
* @alpha: a #ClutterAlpha
* @dummy: unused argument
*
* Convenience alpha function for a sine wave. You can use this
* function as the alpha function for clutter_alpha_set_func().
* Convenience alpha function for a sine wave over interval <0, pi/2>.
* You can use this function as the alpha function for
* clutter_alpha_set_func().
*
* Return value: an alpha value.
*
@ -614,11 +615,55 @@ guint32
clutter_sine_inc_func (ClutterAlpha *alpha,
gpointer dummy)
{
#if 0
return sinc_func (alpha, 0.5, 1.0);
#else
return sincx1024_func (alpha, 256, CFX_ONE);
#endif
ClutterTimeline * timeline;
gint frame;
gint n_frames;
ClutterAngle x;
ClutterFixed sine;
timeline = clutter_alpha_get_timeline (alpha);
frame = clutter_timeline_get_current_frame (timeline);
n_frames = clutter_timeline_get_n_frames (timeline);
x = 256 * frame / n_frames;
sine = clutter_sini (x) * CLUTTER_ALPHA_MAX_ALPHA;
return CFX_INT (sine);
}
/**
* clutter_sine_dec_func:
* @alpha: a #ClutterAlpha
* @dummy: unused argument
*
* Convenience alpha function for a sine wave over interval <pi/2, pi>.
* You can use this function as the alpha function for
* clutter_alpha_set_func().
*
* Return value: an alpha value.
*
* Since: 0.4
*/
guint32
clutter_sine_dec_func (ClutterAlpha *alpha,
gpointer dummy)
{
ClutterTimeline * timeline;
gint frame;
gint n_frames;
ClutterAngle x;
ClutterFixed sine;
timeline = clutter_alpha_get_timeline (alpha);
frame = clutter_timeline_get_current_frame (timeline);
n_frames = clutter_timeline_get_n_frames (timeline);
x = 256 * frame / n_frames + 256;
sine = clutter_sini (x) * CLUTTER_ALPHA_MAX_ALPHA;
return CFX_INT (sine);
}
/**