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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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7
ChangeLog
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@ -1,3 +1,10 @@
2007-05-16 Tomas Frydrych <tf@openedhand.com>
* clutter/clutter-alpha.h:
* clutter/clutter-alpha.c:
* doc/reference/clutter-sections.txt:
Fixed clutter_sine_inc(), added clutter_sine_dec().
2007-05-16 Tomas Frydrych <tf@openedhand.com>
* clutter/clutter-alpha.h:

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);
}
/**

7
clutter/clutter-alpha.h
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@ -106,7 +106,8 @@ ClutterTimeline *clutter_alpha_get_timeline (ClutterAlpha *alpha);
#define CLUTTER_ALPHA_RAMP_DEC clutter_ramp_dec_func
#define CLUTTER_ALPHA_RAMP clutter_ramp_func
#define CLUTTER_ALPHA_SINE clutter_sine_func
/* FIXME add SINE_INC/DEC */
#define CLUTTER_ALPHA_SINE_INC clutter_sine_inc_func
#define CLUTTER_ALPHA_SINE_DEC clutter_sine_dec_func
#define CLUTTER_ALPHA_SQUARE clutter_square_func
#define CLUTTER_ALPHA_SMOOTHSTEP clutter_smoothstep_func
@ -132,6 +133,10 @@ guint32 clutter_ramp_func (ClutterAlpha *alpha,
gpointer dummy);
guint32 clutter_sine_func (ClutterAlpha *alpha,
gpointer dummy);
guint32 clutter_sine_inc_func (ClutterAlpha *alpha,
gpointer dummy);
guint32 clutter_sine_dec_func (ClutterAlpha *alpha,
gpointer dummy);
guint32 clutter_square_func (ClutterAlpha *alpha,
gpointer dummy);
guint32 clutter_smoothstep_func (ClutterAlpha *alpha,

4
doc/reference/clutter-sections.txt
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@ -112,6 +112,10 @@ CLUTTER_ALPHA_RAMP
clutter_ramp_func
CLUTTER_ALPHA_SINE
clutter_sine_func
CLUTTER_ALPHA_SINE_INC
clutter_sine_inc_func
CLUTTER_ALPHA_SINE_DEC
clutter_sine_dec_func
CLUTTER_ALPHA_SQUARE
clutter_square_func
CLUTTER_ALPHA_SMOOTHSTEP