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Add a scale center property to ClutterActor

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This sets the center point from which the scaling will occur. This can
be used insetad of the anchor point to avoid moving the actor. Like
the anchor point, it can be specified as either a coordinate in units
or a gravity enum.

To set the center you can use two new variants of set_scale:

clutter_actor_set_scale_full (ClutterActor *self,
                              gdouble       scale_x,
                              gdouble       scale_y,
                              int           center_x,
                              int           center_y);

or

clutter_actor_set_scale_with_gravity (ClutterActor   *self,
                                      gdouble         scale_x,
                                      gdouble         scale_y,
                                      ClutterGravity  gravity);

The ClutterFixed variants of the set_scale functions have been removed
and the scale value is now always stored as a double.
This commit is contained in:
Neil Roberts 2009-01-23 11:11:24 +00:00
parent 7818eb704d
commit e10d255b83
3 changed files with 245 additions and 65 deletions
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279
clutter/clutter-actor.c
View File

@ -279,8 +279,10 @@ struct _ClutterActorPrivate
gchar *name;
guint32 id; /* Unique ID */
ClutterFixed scale_x;
ClutterFixed scale_y;
gdouble scale_x;
gdouble scale_y;
AnchorCoord scale_center;
ShaderData *shader_data;
@ -341,6 +343,9 @@ enum
PROP_SCALE_X,
PROP_SCALE_Y,
PROP_SCALE_CENTER_X,
PROP_SCALE_CENTER_Y,
PROP_SCALE_GRAVITY,
PROP_ROTATION_ANGLE_X,
PROP_ROTATION_ANGLE_Y,
@ -1424,7 +1429,8 @@ _clutter_actor_apply_modelview_transform (ClutterActor *self)
* entire object will move on the screen as a result of rotating it).
*/
if (priv->scale_x != 1.0 || priv->scale_y != 1.0)
cogl_scale (priv->scale_x, priv->scale_y);
TRANSFORM_ABOUT_ANCHOR_COORD (self, &priv->scale_center,
cogl_scale (priv->scale_x, priv->scale_y));
if (priv->rzang)
{
@ -1726,16 +1732,48 @@ clutter_actor_set_property (GObject *object,
clutter_actor_hide (actor);
break;
case PROP_SCALE_X:
clutter_actor_set_scalex
(actor,
CLUTTER_FLOAT_TO_FIXED (g_value_get_double (value)),
priv->scale_y);
clutter_actor_set_scale (actor,
g_value_get_double (value),
priv->scale_y);
break;
case PROP_SCALE_Y:
clutter_actor_set_scalex
(actor,
priv->scale_x,
CLUTTER_FLOAT_TO_FIXED (g_value_get_double (value)));
clutter_actor_set_scale (actor,
priv->scale_x,
g_value_get_double (value));
break;
case PROP_SCALE_CENTER_X:
{
int center_x = g_value_get_int (value);
ClutterUnit center_y;
clutter_anchor_coord_get_units (actor, &priv->scale_center,
NULL, &center_y, NULL);
clutter_actor_set_scale_fullu (actor,
priv->scale_x,
priv->scale_y,
CLUTTER_UNITS_FROM_DEVICE (center_x),
center_y);
}
break;
case PROP_SCALE_CENTER_Y:
{
ClutterUnit center_x;
gint center_y = g_value_get_int (value);
clutter_anchor_coord_get_units (actor, &priv->scale_center,
&center_x, NULL, NULL);
clutter_actor_set_scale_fullu (actor,
priv->scale_x,
priv->scale_y,
center_x,
CLUTTER_UNITS_FROM_DEVICE (center_y));
}
break;
case PROP_SCALE_GRAVITY:
clutter_actor_set_scale_with_gravity (actor,
priv->scale_x,
priv->scale_y,
g_value_get_enum (value));
break;
case PROP_CLIP:
{
@ -1961,10 +1999,27 @@ clutter_actor_get_property (GObject *object,
}
break;
case PROP_SCALE_X:
g_value_set_double (value, CLUTTER_FIXED_TO_DOUBLE (priv->scale_x));
g_value_set_double (value, priv->scale_x);
break;
case PROP_SCALE_Y:
g_value_set_double (value, CLUTTER_FIXED_TO_DOUBLE (priv->scale_y));
g_value_set_double (value, priv->scale_y);
break;
case PROP_SCALE_CENTER_X:
{
gint center;
clutter_actor_get_scale_center (actor, &center, NULL);
g_value_set_int (value, center);
}
break;
case PROP_SCALE_CENTER_Y:
{
gint center;
clutter_actor_get_scale_center (actor, NULL, &center);
g_value_set_int (value, center);
}
break;
case PROP_SCALE_GRAVITY:
g_value_set_enum (value, clutter_actor_get_scale_gravity (actor));
break;
case PROP_REACTIVE:
g_value_set_boolean (value, clutter_actor_get_reactive (actor));
@ -2553,6 +2608,51 @@ clutter_actor_class_init (ClutterActorClass *klass)
G_MAXDOUBLE,
1.0,
CLUTTER_PARAM_READWRITE));
/**
* ClutterActor:scale-center-x:
*
* The horizontal center point for scaling
*
* Since: 1.0
*/
pspec = g_param_spec_int ("scale-center-x",
"Scale-Center-X",
"Horizontal scale center",
G_MININT, G_MAXINT, 0,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_SCALE_CENTER_X, pspec);
/**
* ClutterActor:scale-center-y:
*
* The vertical center point for scaling
*
* Since: 1.0
*/
pspec = g_param_spec_int ("scale-center-y",
"Scale-Center-Y",
"Vertical scale center",
G_MININT, G_MAXINT, 0,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_SCALE_CENTER_Y, pspec);
/**
* ClutterActor:scale-gravity:
*
* The center point for scaling expressed as a #ClutterGravity
*
* Since: 1.0
*/
pspec = g_param_spec_enum ("scale-gravity",
"Scale-Gravity",
"The center of scaling",
CLUTTER_TYPE_GRAVITY,
CLUTTER_GRAVITY_NONE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (object_class,
PROP_SCALE_GRAVITY, pspec);
/**
* ClutterActor:rotation-angle-x:
*
@ -5018,20 +5118,20 @@ clutter_actor_get_yu (ClutterActor *self)
}
/**
* clutter_actor_set_scalex:
* clutter_actor_set_scale:
* @self: A #ClutterActor
* @scale_x: #ClutterFixed factor to scale actor by horizontally.
* @scale_y: #ClutterFixed factor to scale actor by vertically.
*
* Fixed point version of clutter_actor_set_scale().
* @scale_x: double factor to scale actor by horizontally.
* @scale_y: double factor to scale actor by vertically.
*
* Scales an actor with the given factors. The scaling is always
* relative to the anchor point.
*
* Since: 0.2
*/
void
clutter_actor_set_scalex (ClutterActor *self,
ClutterFixed scale_x,
ClutterFixed scale_y)
clutter_actor_set_scale (ClutterActor *self,
gdouble scale_x,
gdouble scale_y)
{
g_return_if_fail (CLUTTER_IS_ACTOR (self));
@ -5045,59 +5145,86 @@ clutter_actor_set_scalex (ClutterActor *self,
g_object_notify (G_OBJECT (self), "scale-y");
g_object_thaw_notify (G_OBJECT (self));
g_object_unref (self);
if (CLUTTER_ACTOR_IS_VISIBLE (self))
clutter_actor_queue_redraw (self);
g_object_unref (self);
}
/**
* clutter_actor_set_scale:
* @self: A #ClutterActor
* @scale_x: double factor to scale actor by horizontally.
* @scale_y: double factor to scale actor by vertically.
*
* Scales an actor with the given factors. The scaling is always
* relative to the anchor point.
*
* Since: 0.2
*/
void
clutter_actor_set_scale (ClutterActor *self,
gdouble scale_x,
gdouble scale_y)
clutter_actor_set_scale_full (ClutterActor *self,
gdouble scale_x,
gdouble scale_y,
int center_x,
int center_y)
{
g_return_if_fail (CLUTTER_IS_ACTOR (self));
clutter_actor_set_scalex (self,
CLUTTER_FLOAT_TO_FIXED (scale_x),
CLUTTER_FLOAT_TO_FIXED (scale_y));
clutter_actor_set_scale_fullu (self, scale_x, scale_y,
CLUTTER_UNITS_FROM_DEVICE (center_x),
CLUTTER_UNITS_FROM_DEVICE (center_y));
}
/**
* clutter_actor_get_scalex:
* @self: A #ClutterActor
* @scale_x: Location to store horizonal scale factor, or %NULL.
* @scale_y: Location to store vertical scale factor, or %NULL.
*
* Fixed point version of clutter_actor_get_scale().
*
* Retrieves the scale factors of an actor.
*
* Since: 0.2
*/
void
clutter_actor_get_scalex (ClutterActor *self,
ClutterFixed *scale_x,
ClutterFixed *scale_y)
clutter_actor_set_scale_fullu (ClutterActor *self,
gdouble scale_x,
gdouble scale_y,
ClutterUnit center_x,
ClutterUnit center_y)
{
ClutterActorPrivate *priv;
g_return_if_fail (CLUTTER_IS_ACTOR (self));
if (scale_x)
*scale_x = self->priv->scale_x;
priv = self->priv;
if (scale_y)
*scale_y = self->priv->scale_y;
g_object_ref (self);
g_object_freeze_notify (G_OBJECT (self));
clutter_actor_set_scale (self, scale_x, scale_y);
if (priv->scale_center.is_fractional)
g_object_notify (G_OBJECT (self), "scale-gravity");
g_object_notify (G_OBJECT (self), "scale-center-x");
g_object_notify (G_OBJECT (self), "scale-center-y");
clutter_anchor_coord_set_units (&priv->scale_center, center_x, center_y, 0);
g_object_thaw_notify (G_OBJECT (self));
g_object_unref (self);
}
void
clutter_actor_set_scale_with_gravity (ClutterActor *self,
gdouble scale_x,
gdouble scale_y,
ClutterGravity gravity)
{
ClutterActorPrivate *priv;
g_return_if_fail (CLUTTER_IS_ACTOR (self));
priv = self->priv;
if (gravity == CLUTTER_GRAVITY_NONE)
clutter_actor_set_scale_full (self, scale_x, scale_y, 0, 0);
else
{
g_object_ref (self);
g_object_freeze_notify (G_OBJECT (self));
clutter_actor_set_scale (self, scale_x, scale_y);
g_object_notify (G_OBJECT (self), "scale-gravity");
g_object_notify (G_OBJECT (self), "scale-center-x");
g_object_notify (G_OBJECT (self), "scale-center-y");
clutter_anchor_coord_set_gravity (&priv->scale_center, gravity);
g_object_thaw_notify (G_OBJECT (self));
g_object_unref (self);
}
}
/**
@ -5124,6 +5251,42 @@ clutter_actor_get_scale (ClutterActor *self,
*scale_y = CLUTTER_FIXED_TO_FLOAT (self->priv->scale_y);
}
void
clutter_actor_get_scale_center (ClutterActor *self,
gint *center_x,
gint *center_y)
{
ClutterUnit xu, yu;
g_return_if_fail (CLUTTER_IS_ACTOR (self));
clutter_actor_get_scale_centeru (self, &xu, &yu);
if (center_x)
*center_x = CLUTTER_UNITS_TO_DEVICE (xu);
if (center_y)
*center_y = CLUTTER_UNITS_TO_DEVICE (yu);
}
void
clutter_actor_get_scale_centeru (ClutterActor *self,
ClutterUnit *center_x,
ClutterUnit *center_y)
{
g_return_if_fail (CLUTTER_IS_ACTOR (self));
clutter_anchor_coord_get_units (self, &self->priv->scale_center,
center_x, center_y, NULL);
}
ClutterGravity
clutter_actor_get_scale_gravity (ClutterActor *self)
{
g_return_val_if_fail (CLUTTER_IS_ACTOR (self), CLUTTER_GRAVITY_NONE);
return clutter_anchor_coord_get_gravity (&self->priv->scale_center);
}
/**
* clutter_actor_set_opacity:
* @self: A #ClutterActor

27
clutter/clutter-actor.h
View File

@ -474,18 +474,33 @@ void clutter_actor_set_depthu (ClutterActor
ClutterUnit depth);
ClutterUnit clutter_actor_get_depthu (ClutterActor *self);
void clutter_actor_set_scalex (ClutterActor *self,
ClutterFixed scale_x,
ClutterFixed scale_y);
void clutter_actor_set_scale (ClutterActor *self,
gdouble scale_x,
gdouble scale_y);
void clutter_actor_get_scalex (ClutterActor *self,
ClutterFixed *scale_x,
ClutterFixed *scale_y);
void clutter_actor_set_scale_full (ClutterActor *self,
gdouble scale_x,
gdouble scale_y,
int center_x,
int center_y);
void clutter_actor_set_scale_fullu (ClutterActor *self,
gdouble scale_x,
gdouble scale_y,
ClutterUnit center_x,
ClutterUnit center_y);
void clutter_actor_set_scale_with_gravity (ClutterActor *self,
gdouble scale_x,
gdouble scale_y,
ClutterGravity gravity);
void clutter_actor_get_scale (ClutterActor *self,
gdouble *scale_x,
gdouble *scale_y);
void clutter_actor_get_scale_center (ClutterActor *self,
gint *center_x,
gint *center_y);
void clutter_actor_get_scale_centeru (ClutterActor *self,
ClutterUnit *center_x,
ClutterUnit *center_y);
ClutterGravity clutter_actor_get_scale_gravity (ClutterActor *self);
void clutter_actor_move_by (ClutterActor *self,
gint dx,

4
clutter/clutter-behaviour-scale.c
View File

@ -85,7 +85,9 @@ scale_frame_foreach (ClutterBehaviour *behaviour,
{
ScaleFrameClosure *closure = data;
clutter_actor_set_scalex (actor, closure->scale_x, closure->scale_y);
clutter_actor_set_scale (actor,
CLUTTER_FIXED_TO_DOUBLE (closure->scale_x),
CLUTTER_FIXED_TO_DOUBLE (closure->scale_y));
}
static void