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mutter/clutter/clutter-behaviour-rotate.c

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2007 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-rotate
* @short_description: A behaviour class to rotate actors
*
* A #ClutterBehaviourRotate rotate actors between a starting and ending
* angle on a given axis.
*
* The #ClutterBehaviourRotate is available since version 0.4.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-actor.h"
#include "clutter-behaviour.h"
#include "clutter-main.h"
#include "clutter-fixed.h"
#include "clutter-behaviour-rotate.h"
#include "clutter-enum-types.h"
#include "clutter-private.h"
#include "clutter-debug.h"
#include <math.h>
G_DEFINE_TYPE (ClutterBehaviourRotate,
clutter_behaviour_rotate,
CLUTTER_TYPE_BEHAVIOUR);
struct _ClutterBehaviourRotatePrivate
{
ClutterFixed angle_begin;
ClutterFixed angle_end;
ClutterRotateAxis axis;
ClutterRotateDirection direction;
gint center_x;
gint center_y;
gint center_z;
};
#define CLUTTER_BEHAVIOUR_ROTATE_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
CLUTTER_TYPE_BEHAVIOUR_ROTATE, \
ClutterBehaviourRotatePrivate))
enum
{
PROP_0,
PROP_ANGLE_BEGIN,
PROP_ANGLE_END,
PROP_AXIS,
PROP_DIRECTION,
PROP_CENTER_X,
PROP_CENTER_Y,
PROP_CENTER_Z
};
static void
alpha_notify_foreach (ClutterBehaviour *behaviour,
ClutterActor *actor,
gpointer data)
{
ClutterFixed angle;
ClutterBehaviourRotate *rotate_behaviour;
ClutterBehaviourRotatePrivate *priv;
rotate_behaviour = CLUTTER_BEHAVIOUR_ROTATE (behaviour);
priv = rotate_behaviour->priv;
angle = GPOINTER_TO_UINT(data);
switch (priv->axis)
{
case CLUTTER_X_AXIS:
clutter_actor_rotate_xx (actor,
angle,
priv->center_y, priv->center_z);
break;
case CLUTTER_Y_AXIS:
clutter_actor_rotate_yx (actor,
angle,
priv->center_x, priv->center_z);
break;
case CLUTTER_Z_AXIS:
clutter_actor_rotate_zx (actor,
angle,
priv->center_x, priv->center_y);
break;
}
}
static void
clutter_behaviour_rotate_alpha_notify (ClutterBehaviour *behaviour,
guint32 alpha_value)
{
ClutterFixed factor, angle, diff;
ClutterBehaviourRotate *rotate_behaviour;
ClutterBehaviourRotatePrivate *priv;
rotate_behaviour = CLUTTER_BEHAVIOUR_ROTATE (behaviour);
priv = rotate_behaviour->priv;
factor = CLUTTER_INT_TO_FIXED (alpha_value) / CLUTTER_ALPHA_MAX_ALPHA;
angle = 0;
switch (priv->direction)
{
case CLUTTER_ROTATE_CW:
if (priv->angle_end >= priv->angle_begin)
{
angle = CLUTTER_FIXED_MUL (factor,
(priv->angle_end - priv->angle_begin));
angle += priv->angle_begin;
}
else
{
/* Work out the angular length of the arch represented by the
* end angle in CCW direction
*/
if (priv->angle_begin >= CLUTTER_INT_TO_FIXED (360))
{
ClutterFixed rounds, a1, a2;
rounds = priv->angle_begin / 360;
a1 = rounds * 360;
a2 = - (priv->angle_begin - a1);
diff = a1 + a2 + priv->angle_end;
}
else
{
diff = CLUTTER_INT_TO_FIXED (360)
- priv->angle_begin
+ priv->angle_end;
}
angle = CLUTTER_FIXED_MUL (diff, factor);
angle += priv->angle_begin;
}
break;
case CLUTTER_ROTATE_CCW:
if (priv->angle_end <= priv->angle_begin)
{
angle = CLUTTER_FIXED_MUL (factor,
(priv->angle_begin - priv->angle_end));
angle = priv->angle_begin - angle;
}
else
{
/* Work out the angular length of the arch represented by the
* end angle in CCW direction
*/
if (priv->angle_end >= CLUTTER_INT_TO_FIXED (360))
{
ClutterFixed rounds, a1, a2;
rounds = priv->angle_end / 360;
a1 = rounds * 360;
a2 = - (priv->angle_end - a1);
diff = a1 + a2 + priv->angle_begin;
}
else
{
diff = CLUTTER_INT_TO_FIXED (360)
- priv->angle_end
+ priv->angle_begin;
}
angle = priv->angle_begin - CLUTTER_FIXED_MUL (diff, factor);
}
break;
}
clutter_behaviour_actors_foreach (behaviour,
alpha_notify_foreach,
GUINT_TO_POINTER ((guint)angle));
}
static void
clutter_behaviour_rotate_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBehaviourRotate *rotate;
ClutterBehaviourRotatePrivate *priv;
rotate = CLUTTER_BEHAVIOUR_ROTATE (gobject);
priv = rotate->priv;
switch (prop_id)
{
case PROP_ANGLE_BEGIN:
priv->angle_begin = CLUTTER_FLOAT_TO_FIXED (g_value_get_double (value));
break;
case PROP_ANGLE_END:
priv->angle_end = CLUTTER_FLOAT_TO_FIXED (g_value_get_double (value));
break;
case PROP_AXIS:
priv->axis = g_value_get_enum (value);
break;
case PROP_DIRECTION:
priv->direction = g_value_get_enum (value);
break;
case PROP_CENTER_X:
clutter_behaviour_rotate_set_center (rotate,
g_value_get_int (value),
priv->center_y,
priv->center_z);
break;
case PROP_CENTER_Y:
clutter_behaviour_rotate_set_center (rotate,
priv->center_x,
g_value_get_int (value),
priv->center_z);
break;
case PROP_CENTER_Z:
clutter_behaviour_rotate_set_center (rotate,
priv->center_x,
priv->center_y,
g_value_get_int (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_behaviour_rotate_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBehaviourRotatePrivate *priv;
priv = CLUTTER_BEHAVIOUR_ROTATE (gobject)->priv;
switch (prop_id)
{
case PROP_ANGLE_BEGIN:
g_value_set_double (value, CLUTTER_FIXED_TO_DOUBLE (priv->angle_begin));
break;
case PROP_ANGLE_END:
g_value_set_double (value, CLUTTER_FIXED_TO_DOUBLE (priv->angle_end));
break;
case PROP_AXIS:
g_value_set_enum (value, priv->axis);
break;
case PROP_DIRECTION:
g_value_set_enum (value, priv->direction);
break;
case PROP_CENTER_X:
g_value_set_int (value, priv->center_x);
break;
case PROP_CENTER_Y:
g_value_set_int (value, priv->center_y);
break;
case PROP_CENTER_Z:
g_value_set_int (value, priv->center_z);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_behaviour_rotate_class_init (ClutterBehaviourRotateClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterBehaviourClass *behaviour_class = CLUTTER_BEHAVIOUR_CLASS (klass);
gobject_class->set_property = clutter_behaviour_rotate_set_property;
gobject_class->get_property = clutter_behaviour_rotate_get_property;
behaviour_class->alpha_notify = clutter_behaviour_rotate_alpha_notify;
/**
* ClutterBehaviourRotate:angle-begin:
*
* The initial angle from whence the rotation should begin.
*
* Since: 0.4
*/
g_object_class_install_property (gobject_class,
PROP_ANGLE_BEGIN,
g_param_spec_double ("angle-begin",
"Angle Begin",
"Initial angle",
0.0,
CLUTTER_ANGLE_MAX_DEG,
0.0,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourRotate:angle-end:
*
* The final angle to where the rotation should end.
*
* Since: 0.4
*/
g_object_class_install_property (gobject_class,
PROP_ANGLE_END,
g_param_spec_double ("angle-end",
"Angle End",
"Final angle",
0.0,
CLUTTER_ANGLE_MAX_DEG,
360.0,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourRotate:axis:
*
* The axis of rotation.
*
* Since: 0.4
*/
g_object_class_install_property (gobject_class,
PROP_AXIS,
g_param_spec_enum ("axis",
"Axis",
"Axis of rotation",
CLUTTER_TYPE_ROTATE_AXIS,
CLUTTER_Z_AXIS,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourRotate:direction:
*
* The direction of the rotation.
*
* Since: 0.4
*/
g_object_class_install_property (gobject_class,
PROP_DIRECTION,
g_param_spec_enum ("direction",
"Direction",
"Direction of rotation",
CLUTTER_TYPE_ROTATE_DIRECTION,
CLUTTER_ROTATE_CW,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourRotate:center-x:
*
* The x center of rotation.
*
* Since: 0.4
*/
g_object_class_install_property (gobject_class,
PROP_CENTER_X,
g_param_spec_int ("center-x",
"Center-X",
"X center of rotation",
-G_MAXINT, G_MAXINT,
0,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourRotate:center-y:
*
* The y center of rotation.
*
* Since: 0.4
*/
g_object_class_install_property (gobject_class,
PROP_CENTER_Y,
g_param_spec_int ("center-y",
"Center-Y",
"Y center of rotation",
-G_MAXINT, G_MAXINT,
0,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourRotate:center-z:
*
* The z center of rotation.
*
* Since: 0.4
*/
g_object_class_install_property (gobject_class,
PROP_CENTER_Z,
g_param_spec_int ("center-z",
"Center-Z",
"Z center of rotation",
-G_MAXINT, G_MAXINT,
0,
CLUTTER_PARAM_READWRITE));
g_type_class_add_private (klass, sizeof (ClutterBehaviourRotatePrivate));
}
static void
clutter_behaviour_rotate_init (ClutterBehaviourRotate *rotate)
{
ClutterBehaviourRotatePrivate *priv;
rotate->priv = priv = CLUTTER_BEHAVIOUR_ROTATE_GET_PRIVATE (rotate);
priv->angle_begin = CLUTTER_FLOAT_TO_FIXED (0.0);
priv->angle_end = CLUTTER_FLOAT_TO_FIXED (360.0);
priv->axis = CLUTTER_Z_AXIS;
priv->direction = CLUTTER_ROTATE_CW;
priv->center_x = priv->center_y = priv->center_z = 0;
}
/**
* clutter_behaviour_rotate_new:
* @alpha: a #ClutterAlpha, or %NULL
* @axis: the rotation axis
* @direction: the rotation direction
* @angle_begin: the starting angle
* @angle_end: the final angle
*
* Creates a new #ClutterBehaviourRotate. This behaviour will rotate actors
* bound to it on @axis, following @direction, between @angle_begin and
* @angle_end.
*
* Return value: the newly created #ClutterBehaviourRotate.
*
* Since: 0.4
*/
ClutterBehaviour *
clutter_behaviour_rotate_new (ClutterAlpha *alpha,
ClutterRotateAxis axis,
ClutterRotateDirection direction,
gdouble angle_begin,
gdouble angle_end)
{
g_return_val_if_fail (alpha == NULL || CLUTTER_IS_ALPHA (alpha), NULL);
return g_object_new (CLUTTER_TYPE_BEHAVIOUR_ROTATE,
"alpha", alpha,
"axis", axis,
"direction", direction,
"angle-begin", angle_begin,
"angle-end", angle_end,
NULL);
}
/**
* clutter_behaviour_rotate_newx:
* @alpha: a #ClutterAlpha or %NULL
* @axis: the rotation axis
* @direction: the rotation direction
* @angle_begin: the starting angle, in fixed point notation
* @angle_end: the final angle, in fixed point notation
*
* Creates a new #ClutterBehaviourRotate. This is the fixed point version
* of clutter_behaviour_rotate_new().
*
* Return value: the newly created #ClutterBehaviourRotate.
*
* Since: 0.4
*/
ClutterBehaviour *
clutter_behaviour_rotate_newx (ClutterAlpha *alpha,
ClutterRotateAxis axis,
ClutterRotateDirection direction,
ClutterFixed angle_begin,
ClutterFixed angle_end)
{
ClutterBehaviour *retval;
ClutterBehaviourRotatePrivate *priv;
g_return_val_if_fail (alpha == NULL || CLUTTER_IS_ALPHA (alpha), NULL);
retval = g_object_new (CLUTTER_TYPE_BEHAVIOUR_ROTATE,
"alpha", alpha,
"axis", axis,
"direction", direction,
NULL);
/* we don't want to convert the angles from fixed to boolean
* and then back again to fixed.
*/
priv = CLUTTER_BEHAVIOUR_ROTATE_GET_PRIVATE (retval);
priv->angle_begin = angle_begin;
priv->angle_end = angle_end;
return retval;
}
/**
* clutter_behaviour_rotate_get_axis:
* @rotate: a #ClutterBehaviourRotate
*
* Retrieves the #ClutterRotateAxis used by the rotate behaviour.
*
* Return value: the rotation axis
*
* Since: 0.4
*/
ClutterRotateAxis
clutter_behaviour_rotate_get_axis (ClutterBehaviourRotate *rotate)
{
g_return_val_if_fail (CLUTTER_IS_BEHAVIOUR_ROTATE (rotate), CLUTTER_Z_AXIS);
return rotate->priv->axis;
}
/**
* clutter_behaviour_rotate_set_axis:
* @rotate: a #ClutterBehaviourRotate
* @axis: a #ClutterRotateAxis
*
* Sets the axis used by the rotate behaviour.
*
* Since: 0.4
*/
void
clutter_behaviour_rotate_set_axis (ClutterBehaviourRotate *rotate,
ClutterRotateAxis axis)
{
ClutterBehaviourRotatePrivate *priv;
g_return_if_fail (CLUTTER_IS_BEHAVIOUR_ROTATE (rotate));
priv = rotate->priv;
if (priv->axis != axis)
{
priv->axis = axis;
g_object_notify (G_OBJECT (rotate), "axis");
}
}
/**
* clutter_behaviour_rotate_get_direction:
* @rotate: a #ClutterBehaviourRotate
*
* Retrieves the #ClutterRotateDirection used by the rotate behaviour.
*
* Return value: the rotation direction
*
* Since: 0.4
*/
ClutterRotateDirection
clutter_behaviour_rotate_get_direction (ClutterBehaviourRotate *rotate)
{
g_return_val_if_fail (CLUTTER_IS_BEHAVIOUR_ROTATE (rotate),
CLUTTER_ROTATE_CW);
return rotate->priv->direction;
}
/**
* clutter_behaviour_rotate_set_direction:
* @rotate: a #ClutterBehaviourRotate
* @direction: the rotation direction
*
* Sets the rotation direction used by the rotate behaviour.
*
* Since: 0.4
*/
void
clutter_behaviour_rotate_set_direction (ClutterBehaviourRotate *rotate,
ClutterRotateDirection direction)
{
ClutterBehaviourRotatePrivate *priv;
g_return_if_fail (CLUTTER_IS_BEHAVIOUR_ROTATE (rotate));
priv = rotate->priv;
if (priv->direction != direction)
{
priv->direction = direction;
g_object_notify (G_OBJECT (rotate), "direction");
}
}
/**
* clutter_behaviour_rotate_get_bounds:
* @rotate: a #ClutterBehaviourRotate
* @angle_begin: return value for the initial angle
* @angle_end: return value for the final angle
*
* Retrieves the rotation boundaries of the rotate behaviour.
*
* Since: 0.4
*/
void
clutter_behaviour_rotate_get_bounds (ClutterBehaviourRotate *rotate,
gdouble *angle_begin,
gdouble *angle_end)
{
ClutterBehaviourRotatePrivate *priv;
g_return_if_fail (CLUTTER_IS_BEHAVIOUR_ROTATE (rotate));
priv = rotate->priv;
if (angle_begin)
*angle_begin = CLUTTER_FIXED_TO_DOUBLE (priv->angle_begin);
if (angle_end)
*angle_end = CLUTTER_FIXED_TO_DOUBLE (priv->angle_end);
}
/**
* clutter_behaviour_rotate_set_bounds:
* @rotate: a #ClutterBehaviourRotate
* @angle_begin: initial angle
* @angle_end: final angle
*
* Sets the initial and final angles of a rotation behaviour.
*
* Since: 0.4
*/
void
clutter_behaviour_rotate_set_bounds (ClutterBehaviourRotate *rotate,
gdouble angle_begin,
gdouble angle_end)
{
g_return_if_fail (CLUTTER_IS_BEHAVIOUR_ROTATE (rotate));
clutter_behaviour_rotate_set_boundsx (rotate,
CLUTTER_FLOAT_TO_FIXED (angle_begin),
CLUTTER_FLOAT_TO_FIXED (angle_end));
}
/**
* clutter_behaviour_rotate_get_boundsx:
* @rotate: a #ClutterBehaviourRotate
* @angle_begin: return value for the initial angle
* @angle_end: return value for the final angle
*
* Retrieves the rotation boundaries of the rotate behaviour. This is
* the fixed point notation version of clutter_behaviour_rotate_get_bounds().
*
* Since: 0.4
*/
void
clutter_behaviour_rotate_get_boundsx (ClutterBehaviourRotate *rotate,
ClutterFixed *angle_begin,
ClutterFixed *angle_end)
{
ClutterBehaviourRotatePrivate *priv;
g_return_if_fail (CLUTTER_IS_BEHAVIOUR_ROTATE (rotate));
priv = rotate->priv;
if (angle_begin);
*angle_begin = priv->angle_begin;
if (angle_end)
*angle_end = priv->angle_end;
}
/**
* clutter_behaviour_rotate_set_boundsx:
* @rotate: a #ClutterBehaviourRotate
* @angle_begin: initial angle, in fixed point notation
* @angle_end: final angle, in fixed point notation
*
* Fixed point version of clutter_behaviour_rotate_set_bounds().
*
* Since: 0.4
*/
void
clutter_behaviour_rotate_set_boundsx (ClutterBehaviourRotate *rotate,
ClutterFixed angle_begin,
ClutterFixed angle_end)
{
ClutterBehaviourRotatePrivate *priv;
g_return_if_fail (CLUTTER_IS_BEHAVIOUR_ROTATE (rotate));
priv = rotate->priv;
g_object_ref (rotate);
g_object_freeze_notify (G_OBJECT (rotate));
if (priv->angle_begin != angle_begin)
{
priv->angle_begin = angle_begin;
g_object_notify (G_OBJECT (rotate), "angle-begin");
}
if (priv->angle_end != angle_end)
{
priv->angle_end = angle_end;
g_object_notify (G_OBJECT (rotate), "angle-end");
}
g_object_thaw_notify (G_OBJECT (rotate));
g_object_unref (rotate);
}
/**
* clutter_behaviour_rotate_set_center:
* @rotate: a #ClutterBehaviourRotate
* @x: X axis center of rotation
* @y: Y axis center of rotation
* @z: Z axis center of rotation
*
* Sets the center of rotation. The coordinates are relative to the plane
* normal to the rotation axis set with clutter_behaviour_rotate_set_axis().
*
* Since: 0.4
*/
void
clutter_behaviour_rotate_set_center (ClutterBehaviourRotate *rotate,
gint x,
gint y,
gint z)
{
ClutterBehaviourRotatePrivate *priv;
g_return_if_fail (CLUTTER_IS_BEHAVIOUR_ROTATE (rotate));
priv = rotate->priv;
g_object_ref (rotate);
g_object_freeze_notify (G_OBJECT (rotate));
if (priv->center_x != x)
{
priv->center_x = x;
g_object_notify (G_OBJECT (rotate), "center-x");
}
if (priv->center_y != y)
{
priv->center_y = y;
g_object_notify (G_OBJECT (rotate), "center-y");
}
if (priv->center_z != z)
{
priv->center_z = z;
g_object_notify (G_OBJECT (rotate), "center-z");
}
g_object_thaw_notify (G_OBJECT (rotate));
g_object_unref (rotate);
}
/**
* clutter_behaviour_rotate_get_center:
* @rotate: a #ClutterBehaviourRotate
* @x: return location for the X center of rotation
* @y: return location for the Y center of rotation
* @z: return location for the Z center of rotation
*
* Retrieves the center of rotation set using
* clutter_behaviour_rotate_set_center().
*
* Since: 0.4
*/
void
clutter_behaviour_rotate_get_center (ClutterBehaviourRotate *rotate,
gint *x,
gint *y,
gint *z)
{
ClutterBehaviourRotatePrivate *priv;
g_return_if_fail (CLUTTER_IS_BEHAVIOUR_ROTATE (rotate));
priv = rotate->priv;
if (x)
*x = priv->center_x;
if (y)
*y = priv->center_y;
if (z)
*z = priv->center_z;
}
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