brl/mutter
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

timeline: Add cubic-bezier() progress functions

Browse Source 
Another progress function from the CSS3 Transitions specification, using
a parametrices cubic bezier curve between (0, 0) and (1, 1) with two
control points.

(sadly, no ASCII art can approximate a cubic bezier, so no graph)

The cubic-bezier() progress function comes with a bunch of preset easing
modes: ease, ease-in, ease-out, and ease-in-out, that we can map to
enumeration values.
This commit is contained in:
Emmanuele Bassi 2012-07-19 21:55:35 -04:00
parent 4546f84408
commit 12c75e9737
6 changed files with 265 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
clutter/clutter-easing.c
View File

@ -402,6 +402,71 @@ clutter_ease_steps_end (double t,
return ease_steps_end ((t / d), n_steps);
}
static inline double
x_for_t (double t,
double x_1,
double x_2)
{
double omt = 1.0 - t;
return 3.0 * omt * omt * t * x_1
+ 3.0 * omt * t * t * x_2
+ t * t * t;
}
static inline double
y_for_t (double t,
double y_1,
double y_2)
{
double omt = 1.0 - t;
return 3.0 * omt * omt * t * y_1
+ 3.0 * omt * t * t * y_2
+ t * t * t;
}
static inline double
t_for_x (double x,
double x_1,
double x_2)
{
double min_t = 0, max_t = 1;
int i;
for (i = 0; i < 30; ++i)
{
double guess_t = (min_t + max_t) / 2.0;
double guess_x = x_for_t (guess_t, x_1, x_2);
if (x < guess_x)
max_t = guess_t;
else
min_t = guess_t;
}
return (min_t + max_t) / 2.0;
}
double
clutter_ease_cubic_bezier (double t,
double d,
double x_1,
double y_1,
double x_2,
double y_2)
{
double p = t / d;
if (p == 0.0)
return 0.0;
if (p == 1.0)
return 1.0;
return y_for_t (t_for_x (p, x_1, x_2), y_1, y_2);
}
/*< private >
* _clutter_animation_modes:
*
@ -446,10 +511,17 @@ static const struct {
{ CLUTTER_EASE_OUT_BOUNCE, clutter_ease_out_bounce, "easeOutBounce" },
{ CLUTTER_EASE_IN_OUT_BOUNCE, clutter_ease_in_out_bounce, "easeInOutBounce" },
/* the parametrized functions need a cast */
{ CLUTTER_STEPS, (ClutterEasingFunc) clutter_ease_steps_end, "steps" },
{ CLUTTER_STEP_START, (ClutterEasingFunc) clutter_ease_steps_start, "stepStart" },
{ CLUTTER_STEP_END, (ClutterEasingFunc) clutter_ease_steps_end, "stepEnd" },
{ CLUTTER_CUBIC_BEZIER, (ClutterEasingFunc) clutter_ease_cubic_bezier, "cubicBezier" },
{ CLUTTER_EASE, (ClutterEasingFunc) clutter_ease_cubic_bezier, "ease" },
{ CLUTTER_EASE_IN, (ClutterEasingFunc) clutter_ease_cubic_bezier, "easeIn" },
{ CLUTTER_EASE_OUT, (ClutterEasingFunc) clutter_ease_cubic_bezier, "easeOut" },
{ CLUTTER_EASE_IN_OUT, (ClutterEasingFunc) clutter_ease_cubic_bezier, "easeInOut" },
{ CLUTTER_ANIMATION_LAST, NULL, "sentinel" },
};

7
clutter/clutter-easing.h
View File

@ -129,6 +129,13 @@ G_GNUC_INTERNAL
double clutter_ease_steps_end (double t,
double d,
int steps);
G_GNUC_INTERNAL
double clutter_ease_cubic_bezier (double t,
double d,
double x_1,
double y_1,
double x_2,
double y_2);
G_END_DECLS

19
clutter/clutter-enums.h
View File

@ -165,7 +165,17 @@ typedef enum { /*< prefix=CLUTTER_REQUEST >*/
* @CLUTTER_STEP_START: equivalent to %CLUTTER_STEPS with a number of steps
* equal to 1, and a step mode of %CLUTTER_STEP_MODE_START. (Since 1.12)
* @CLUTTER_STEP_END: equivalent to %CLUTTER_STEPS with a number of steps
* equal to 1, and a step mode of %CLUTTER_STEP_MODE_END. (Since: 1.12)
* equal to 1, and a step mode of %CLUTTER_STEP_MODE_END. (Since 1.12)
* @CLUTTER_CUBIC_BEZIER: cubic bezier between (0, 0) and (1, 1) with two
* control points; see clutter_timeline_set_cubic_bezier_progress(). (Since 1.12)
* @CLUTTER_EASE: equivalent to %CLUTTER_CUBIC_BEZIER with control points
* in (0.25, 0.1) and (0.25, 1.0). (Since 1.12)
* @CLUTTER_EASE_IN: equivalent to %CLUTTER_CUBIC_BEZIER with control points
* in (0.42, 0) and (1.0, 1.0). (Since 1.12)
* @CLUTTER_EASE_OUT: equivalent to %CLUTTER_CUBIC_BEZIER with control points
* in (0, 0) and (0.58, 1.0). (Since 1.12)
* @CLUTTER_EASE_IN_OUT: equivalent to %CLUTTER_CUBIC_BEZIER with control points
* in (0.42, 0) and (0.58, 1.0). (Since 1.12)
* @CLUTTER_ANIMATION_LAST: last animation mode, used as a guard for
* registered global alpha functions
*
@ -244,6 +254,13 @@ typedef enum {
CLUTTER_STEP_START, /* steps(1, start) */
CLUTTER_STEP_END, /* steps(1, end) */
/* cubic bezier (see css3-transitions) */
CLUTTER_CUBIC_BEZIER,
CLUTTER_EASE,
CLUTTER_EASE_IN,
CLUTTER_EASE_OUT,
CLUTTER_EASE_IN_OUT,
/* guard, before registered alpha functions */
CLUTTER_ANIMATION_LAST
} ClutterAnimationMode;

103
clutter/clutter-timeline.c
View File

@ -150,9 +150,14 @@ struct _ClutterTimelinePrivate
GDestroyNotify progress_notify;
ClutterAnimationMode progress_mode;
/* step() parameters */
gint n_steps;
ClutterStepMode step_mode;
/* cubic-bezier() parameters */
ClutterPoint cb_1;
ClutterPoint cb_2;
guint is_playing : 1;
/* If we've just started playing and haven't yet gotten
@ -815,8 +820,14 @@ clutter_timeline_init (ClutterTimeline *self)
ClutterTimelinePrivate);
priv->progress_mode = CLUTTER_LINEAR;
/* default steps() parameters are 1, end */
priv->n_steps = 1;
priv->step_mode = CLUTTER_STEP_MODE_END;
/* default cubic-bezier() paramereters are (0, 0, 1, 1) */
clutter_point_init (&priv->cb_1, 0, 0);
clutter_point_init (&priv->cb_2, 1, 1);
}
struct CheckIfMarkerHitClosure
@ -2148,6 +2159,27 @@ clutter_timeline_progress_func (ClutterTimeline *timeline,
case CLUTTER_STEP_END:
return clutter_ease_steps_end (elapsed, duration, 1);
case CLUTTER_CUBIC_BEZIER:
return clutter_ease_cubic_bezier (elapsed, duration,
priv->cb_1.x, priv->cb_1.y,
priv->cb_2.x, priv->cb_2.y);
case CLUTTER_EASE:
return clutter_ease_cubic_bezier (elapsed, duration,
0.25, 0.1, 0.25, 1.0);
case CLUTTER_EASE_IN:
return clutter_ease_cubic_bezier (elapsed, duration,
0.42, 0.0, 1.0, 1.0);
case CLUTTER_EASE_OUT:
return clutter_ease_cubic_bezier (elapsed, duration,
0.0, 0.0, 0.58, 1.0);
case CLUTTER_EASE_IN_OUT:
return clutter_ease_cubic_bezier (elapsed, duration,
0.42, 0.0, 0.58, 1.0);
default:
break;
}
@ -2339,3 +2371,74 @@ clutter_timeline_get_step_progress (ClutterTimeline *timeline,
return TRUE;
}
/**
* clutter_timeline_set_cubic_bezier_progress:
* @timeline: a #ClutterTimeline
* @c_1: the first control point for the cubic bezier
* @c_2: the second control point for the cubic bezier
*
* Sets the #ClutterTimeline:progress-mode of @timeline
* to %CLUTTER_CUBIC_BEZIER, and sets the two control
* points for the cubic bezier.
*
* The cubic bezier curve is between (0, 0) and (1, 1). The X coordinate
* of the two control points must be in the [ 0, 1 ] range, while the
* Y coordinate of the two control points can exceed this range.
*
* Since: 1.12
*/
void
clutter_timeline_set_cubic_bezier_progress (ClutterTimeline *timeline,
const ClutterPoint *c_1,
const ClutterPoint *c_2)
{
ClutterTimelinePrivate *priv;
g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
g_return_if_fail (c_1 != NULL && c_2 != NULL);
priv = timeline->priv;
priv->cb_1 = *c_1;
priv->cb_2 = *c_2;
clutter_timeline_set_progress_mode (timeline, CLUTTER_CUBIC_BEZIER);
}
/**
* clutter_timeline_get_cubic_bezier_progress:
* @timeline: a #ClutterTimeline
* @c_1: (out caller-allocates): return location for the first control
* point of the cubic bezier, or %NULL
* @c_2: (out caller-allocates): return location for the second control
* point of the cubic bezier, or %NULL
*
* Retrieves the control points for the cubic bezier progress mode.
*
* Return value: %TRUE if the @timeline is using a cubic bezier progress
* more, and %FALSE otherwise
*
* Since: 1.12
*/
gboolean
clutter_timeline_get_cubic_bezier_progress (ClutterTimeline *timeline,
ClutterPoint *c_1,
ClutterPoint *c_2)
{
g_return_val_if_fail (CLUTTER_IS_TIMELINE (timeline), FALSE);
if (timeline->priv->progress_mode != CLUTTER_CUBIC_BEZIER ||
timeline->priv->progress_mode != CLUTTER_EASE ||
timeline->priv->progress_mode != CLUTTER_EASE_IN ||
timeline->priv->progress_mode != CLUTTER_EASE_OUT ||
timeline->priv->progress_mode != CLUTTER_EASE_IN_OUT)
return FALSE;
if (c_1 != NULL)
*c_1 = timeline->priv->cb_1;
if (c_2 != NULL)
*c_2 = timeline->priv->cb_2;
return TRUE;
}

8
clutter/clutter-timeline.h
View File

@ -178,6 +178,14 @@ CLUTTER_AVAILABLE_IN_1_12
gboolean clutter_timeline_get_step_progress (ClutterTimeline *timeline,
gint *n_steps,
ClutterStepMode *step_mode);
CLUTTER_AVAILABLE_IN_1_12
void clutter_timeline_set_cubic_bezier_progress (ClutterTimeline *timeline,
const ClutterPoint *c_1,
const ClutterPoint *c_2);
CLUTTER_AVAILABLE_IN_1_12
gboolean clutter_timeline_get_cubic_bezier_progress (ClutterTimeline *timeline,
ClutterPoint *c_1,
ClutterPoint *c_2);
CLUTTER_AVAILABLE_IN_1_10
gint64 clutter_timeline_get_duration_hint (ClutterTimeline *timeline);

2
clutter/clutter.symbols
View File

@ -1453,6 +1453,7 @@ clutter_timeline_new
clutter_timeline_clone
clutter_timeline_direction_get_type
clutter_timeline_get_auto_reverse
clutter_timeline_get_cubic_bezier_progress
clutter_timeline_get_current_repeat
clutter_timeline_get_delay
clutter_timeline_get_delta
@ -1473,6 +1474,7 @@ clutter_timeline_pause
clutter_timeline_remove_marker
clutter_timeline_rewind
clutter_timeline_set_auto_reverse
clutter_timeline_set_cubic_bezier_progress
clutter_timeline_set_delay
clutter_timeline_set_direction
clutter_timeline_set_duration