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mutter/clutter/clutter-behaviour-scale.c
Emmanuele Bassi fdb1a82569 Merge from stable: implement gravity in scale behaviour 
Implement every ClutterGravity value inside the scale behaviour and make
the actors anchor to a gravity when scaling up and down.
2007-04-19 15:24:35 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:clutter-behaviour-scale
* @short_description: A behaviour class interpolating actors size between
* two values.
*
* A #ClutterBehaviourScale interpolates actors size between two values.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-actor.h"
#include "clutter-behaviour.h"
#include "clutter-enum-types.h"
#include "clutter-main.h"
#include "clutter-fixed.h"
#include "clutter-behaviour-scale.h"
#include "clutter-private.h"
#include "clutter-debug.h"
#include <math.h>
G_DEFINE_TYPE (ClutterBehaviourScale,
clutter_behaviour_scale,
CLUTTER_TYPE_BEHAVIOUR);
struct _ClutterBehaviourScalePrivate
{
ClutterFixed scale_begin;
ClutterFixed scale_end;
ClutterGravity gravity;
};
#define CLUTTER_BEHAVIOUR_SCALE_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
CLUTTER_TYPE_BEHAVIOUR_SCALE, \
ClutterBehaviourScalePrivate))
enum
{
PROP_0,
PROP_SCALE_BEGIN,
PROP_SCALE_END,
PROP_SCALE_GRAVITY
};
static void
scale_frame_foreach (ClutterBehaviour *behaviour,
ClutterActor *actor,
gpointer data)
{
ClutterBehaviourScalePrivate *priv;
guint sw, sh, w, h;
gint x, y;
guint scale = GPOINTER_TO_UINT (data);
priv = CLUTTER_BEHAVIOUR_SCALE (behaviour)->priv;
clutter_actor_get_abs_size (actor, &w, &h);
clutter_actor_set_scalex (actor, scale, scale);
if (priv->gravity == CLUTTER_GRAVITY_NONE ||
priv->gravity == CLUTTER_GRAVITY_NORTH_WEST)
return;
clutter_actor_get_abs_size (actor, &sw, &sh);
x = clutter_actor_get_x (actor);
y = clutter_actor_get_y (actor);
switch (priv->gravity)
{
case CLUTTER_GRAVITY_NORTH:
clutter_actor_set_position (actor, x - ((sw - w) / 2), y);
break;
case CLUTTER_GRAVITY_NORTH_EAST:
clutter_actor_set_position (actor, x + w - sw, y);
break;
case CLUTTER_GRAVITY_EAST:
clutter_actor_set_position (actor, x + w - sw, y - (sh - h) / 2);
break;
case CLUTTER_GRAVITY_SOUTH_EAST:
clutter_actor_set_position (actor, x + w - sw, y + h - sh);
break;
case CLUTTER_GRAVITY_SOUTH:
clutter_actor_set_position (actor, x - ((sw - w) / 2), y + h - sh);
break;
case CLUTTER_GRAVITY_SOUTH_WEST:
clutter_actor_set_position (actor, x, y + h - sh);
break;
case CLUTTER_GRAVITY_WEST:
clutter_actor_set_position (actor, x, y - ((sh - h) / 2));
break;
case CLUTTER_GRAVITY_CENTER:
clutter_actor_set_position (actor,
x - ((sw - w) / 2),
y - ((sh - h) / 2));
default:
break;
}
}
static void
clutter_behaviour_scale_alpha_notify (ClutterBehaviour *behave,
guint32 alpha_value)
{
ClutterFixed scale, factor;
ClutterBehaviourScalePrivate *priv;
priv = CLUTTER_BEHAVIOUR_SCALE (behave)->priv;
factor = CLUTTER_INT_TO_FIXED (alpha_value) / CLUTTER_ALPHA_MAX_ALPHA;
scale = CLUTTER_FIXED_MUL (factor, (priv->scale_end - priv->scale_begin));
scale += priv->scale_begin;
clutter_behaviour_actors_foreach (behave,
scale_frame_foreach,
GUINT_TO_POINTER (scale));
}
static void
clutter_behaviour_scale_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBehaviourScalePrivate *priv;
priv = CLUTTER_BEHAVIOUR_SCALE (gobject)->priv;
switch (prop_id)
{
case PROP_SCALE_BEGIN:
priv->scale_begin = CLUTTER_FLOAT_TO_FIXED (g_value_get_double (value));
break;
case PROP_SCALE_END:
priv->scale_end = CLUTTER_FLOAT_TO_FIXED (g_value_get_double (value));
break;
case PROP_SCALE_GRAVITY:
priv->gravity = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_behaviour_scale_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBehaviourScalePrivate *priv;
priv = CLUTTER_BEHAVIOUR_SCALE (gobject)->priv;
switch (prop_id)
{
case PROP_SCALE_BEGIN:
g_value_set_double (value, CLUTTER_FIXED_TO_FLOAT (priv->scale_begin));
break;
case PROP_SCALE_END:
g_value_set_double (value, CLUTTER_FIXED_TO_FLOAT (priv->scale_end));
break;
case PROP_SCALE_GRAVITY:
g_value_set_enum (value, priv->gravity);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_behaviour_scale_class_init (ClutterBehaviourScaleClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterBehaviourClass *behave_class = CLUTTER_BEHAVIOUR_CLASS (klass);
gobject_class->set_property = clutter_behaviour_scale_set_property;
gobject_class->get_property = clutter_behaviour_scale_get_property;
/**
* ClutterBehaviourScale:scale-begin:
*
* The initial scaling factor for the actors.
*
* Since: 0.2
*/
g_object_class_install_property (gobject_class,
PROP_SCALE_BEGIN,
g_param_spec_double ("scale-begin",
"Scale Begin",
"Initial scale",
0.0, G_MAXDOUBLE,
1.0,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourScale:scale-end:
*
* The final scaling factor for the actors.
*
* Since: 0.2
*/
g_object_class_install_property (gobject_class,
PROP_SCALE_END,
g_param_spec_double ("scale-end",
"Scale End",
"Final scale",
0.0, G_MAXDOUBLE,
1.0,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourScale:gravity:
*
* The gravity of the scaling.
*
* Since: 0.2
*/
g_object_class_install_property (gobject_class,
PROP_SCALE_GRAVITY,
g_param_spec_enum ("scale-gravity",
"Scale Gravity",
"The gravity of the scaling",
CLUTTER_TYPE_GRAVITY,
CLUTTER_GRAVITY_CENTER,
CLUTTER_PARAM_READWRITE));
behave_class->alpha_notify = clutter_behaviour_scale_alpha_notify;
g_type_class_add_private (klass, sizeof (ClutterBehaviourScalePrivate));
}
static void
clutter_behaviour_scale_init (ClutterBehaviourScale *self)
{
ClutterBehaviourScalePrivate *priv;
self->priv = priv = CLUTTER_BEHAVIOUR_SCALE_GET_PRIVATE (self);
}
/**
* clutter_behaviour_scale_new:
* @alpha: a #ClutterAlpha
* @scale_begin: initial scale factor
* @scale_end: final scale factor
* @gravity: FIXME: Not currently implemented
*
* Creates a new #ClutterBehaviourScale instance.
*
* Return value: the newly created #ClutterBehaviourScale
*
* Since: 0.2
*/
ClutterBehaviour *
clutter_behaviour_scale_new (ClutterAlpha *alpha,
gdouble scale_begin,
gdouble scale_end,
ClutterGravity gravity)
{
g_return_val_if_fail (alpha == NULL || CLUTTER_IS_ALPHA (alpha), NULL);
return clutter_behaviour_scale_newx (alpha,
CLUTTER_FLOAT_TO_FIXED (scale_begin),
CLUTTER_FLOAT_TO_FIXED (scale_end),
gravity);
}
/**
* clutter_behaviour_scale_newx:
* @alpha: a #ClutterAlpha
* @scale_begin: initial scale factor
* @scale_end: final scale factor
* @gravity: FIXME: Not currently implemented
*
* A fixed point implementation of clutter_behaviour_scale_new()
*
* Return value: the newly created #ClutterBehaviourScale
*
* Since: 0.2
*/
ClutterBehaviour *
clutter_behaviour_scale_newx (ClutterAlpha *alpha,
ClutterFixed scale_begin,
ClutterFixed scale_end,
ClutterGravity gravity)
{
ClutterBehaviourScale *behave;
g_return_val_if_fail (alpha == NULL || CLUTTER_IS_ALPHA (alpha), NULL);
behave = g_object_new (CLUTTER_TYPE_BEHAVIOUR_SCALE,
"alpha", alpha,
NULL);
behave->priv->scale_begin = scale_begin;
behave->priv->scale_end = scale_end;
behave->priv->gravity = gravity;
return CLUTTER_BEHAVIOUR (behave);
}
/**
* clutter_behaviour_scale_get_bounds:
* @scale: a #ClutterBehaviourScale
* @scale_begin: return location for the initial scale factor
* @scale_end: return location for the final scale factor
*
* Retrieves the bounds used by scale behaviour.
*
* Since: 0.4
*/
void
clutter_behaviour_scale_get_bounds (ClutterBehaviourScale *scale,
gdouble *scale_begin,
gdouble *scale_end)
{
ClutterBehaviourScalePrivate *priv;
g_return_if_fail (CLUTTER_IS_BEHAVIOUR_SCALE (scale));
priv = scale->priv;
if (scale_begin)
*scale_begin = CLUTTER_FIXED_TO_DOUBLE (priv->scale_begin);
if (scale_end)
*scale_end = CLUTTER_FIXED_TO_DOUBLE (priv->scale_end);
}
/**
* clutter_behaviour_scale_get_boundsx:
* @scale: a #ClutterBehaviourScale
* @scale_begin: return location for the initial scale factor
* @scale_end: return location for the final scale factor
*
* Retrieves the bounds used by scale behaviour.
*
* Since: 0.4
*/
void
clutter_behaviour_scale_get_boundsx (ClutterBehaviourScale *scale,
ClutterFixed *scale_begin,
ClutterFixed *scale_end)
{
ClutterBehaviourScalePrivate *priv;
g_return_if_fail (CLUTTER_IS_BEHAVIOUR_SCALE (scale));
priv = scale->priv;
if (scale_begin)
*scale_begin = priv->scale_begin;
if (scale_end)
*scale_end = priv->scale_end;
}
/**
* clutter_behaviour_scale_get_gravity:
* @scale: a #ClutterBehaviourScale
*
* Retrieves the #ClutterGravity applied by the scale behaviour.
*
* Return value: the gravity used by the behaviour
*
* Since: 0.4
*/
ClutterGravity
clutter_behaviour_scale_get_gravity (ClutterBehaviourScale *scale)
{
g_return_val_if_fail (CLUTTER_IS_BEHAVIOUR_SCALE (scale), CLUTTER_GRAVITY_NONE);
return scale->priv->gravity;
}
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