239 lines
7 KiB
C
239 lines
7 KiB
C
/*
|
|
* Clutter.
|
|
*
|
|
* An OpenGL based 'interactive canvas' library.
|
|
*
|
|
* Copyright (C) 2012 Intel Corporation.
|
|
*
|
|
* 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, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* Author:
|
|
* Lionel Landwerlin <lionel.g.landwerlin@linux.intel.com>
|
|
*/
|
|
|
|
/**
|
|
* SECTION:clutter-rotate-action
|
|
* @Title: ClutterRotateAction
|
|
* @Short_Description: Action to rotate an actor
|
|
*
|
|
* #ClutterRotateAction is a sub-class of #ClutterGestureAction that implements
|
|
* the logic for recognizing rotate gestures using two touch points.
|
|
*
|
|
* Since: 1.12
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <math.h>
|
|
|
|
#include "clutter-rotate-action.h"
|
|
|
|
#include "clutter-debug.h"
|
|
#include "clutter-enum-types.h"
|
|
#include "clutter-marshal.h"
|
|
#include "clutter-private.h"
|
|
|
|
struct _ClutterRotateActionPrivate
|
|
{
|
|
gfloat initial_vector[2];
|
|
gdouble initial_vector_norm;
|
|
gdouble initial_rotation;
|
|
};
|
|
|
|
enum
|
|
{
|
|
ROTATE,
|
|
|
|
LAST_SIGNAL
|
|
};
|
|
|
|
static guint rotate_signals[LAST_SIGNAL] = { 0, };
|
|
|
|
G_DEFINE_TYPE (ClutterRotateAction, clutter_rotate_action,
|
|
CLUTTER_TYPE_GESTURE_ACTION);
|
|
|
|
static gboolean
|
|
clutter_rotate_action_real_rotate (ClutterRotateAction *action,
|
|
ClutterActor *actor,
|
|
gdouble angle)
|
|
{
|
|
clutter_actor_set_rotation_angle (actor,
|
|
CLUTTER_Z_AXIS,
|
|
action->priv->initial_rotation + angle);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
clutter_rotate_action_gesture_begin (ClutterGestureAction *action,
|
|
ClutterActor *actor)
|
|
{
|
|
ClutterRotateActionPrivate *priv = CLUTTER_ROTATE_ACTION (action)->priv;
|
|
gfloat p1[2], p2[2];
|
|
|
|
/* capture initial vector */
|
|
clutter_gesture_action_get_motion_coords (action, 0, &p1[0], &p1[1]);
|
|
clutter_gesture_action_get_motion_coords (action, 1, &p2[0], &p2[1]);
|
|
|
|
priv->initial_vector[0] = p2[0] - p1[0];
|
|
priv->initial_vector[1] = p2[1] - p1[1];
|
|
|
|
priv->initial_vector_norm =
|
|
sqrt (priv->initial_vector[0] * priv->initial_vector[0] +
|
|
priv->initial_vector[1] * priv->initial_vector[1]);
|
|
|
|
priv->initial_rotation = clutter_actor_get_rotation_angle (actor, CLUTTER_Z_AXIS);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
clutter_rotate_action_gesture_progress (ClutterGestureAction *action,
|
|
ClutterActor *actor)
|
|
{
|
|
ClutterRotateActionPrivate *priv = CLUTTER_ROTATE_ACTION (action)->priv;
|
|
gfloat p1[2], p2[2];
|
|
gfloat vector[2];
|
|
gboolean retval;
|
|
|
|
/* capture current vector */
|
|
clutter_gesture_action_get_motion_coords (action, 0, &p1[0], &p1[1]);
|
|
clutter_gesture_action_get_motion_coords (action, 1, &p2[0], &p2[1]);
|
|
|
|
vector[0] = p2[0] - p1[0];
|
|
vector[1] = p2[1] - p1[1];
|
|
|
|
if ((vector[0] == priv->initial_vector[0]) &&
|
|
(vector[1] == priv->initial_vector[1]))
|
|
{
|
|
g_signal_emit (action, rotate_signals[ROTATE], 0,
|
|
actor, (gdouble) 0.0,
|
|
&retval);
|
|
}
|
|
else
|
|
{
|
|
gfloat mult[2];
|
|
gfloat norm;
|
|
gdouble angle;
|
|
|
|
/* Computes angle between the 2 initial touch points and the
|
|
current position of the 2 touch points. */
|
|
norm = sqrt (vector[0] * vector[0] + vector[1] * vector[1]);
|
|
norm = (priv->initial_vector[0] * vector[0] +
|
|
priv->initial_vector[1] * vector[1]) / (priv->initial_vector_norm * norm);
|
|
|
|
if ((norm >= -1.0) && (norm <= 1.0))
|
|
angle = acos (norm);
|
|
else
|
|
angle = 0;
|
|
|
|
/* The angle given is comprise between 0 and 180 degrees, we
|
|
need some logic on top to get a value between 0 and 360. */
|
|
mult[0] = priv->initial_vector[0] * vector[1] -
|
|
priv->initial_vector[1] * vector[0];
|
|
mult[1] = priv->initial_vector[1] * vector[0] -
|
|
priv->initial_vector[0] * vector[1];
|
|
|
|
if (mult[0] < 0)
|
|
angle = -angle;
|
|
|
|
/* Convert radians to degrees */
|
|
angle = angle * 180.0 / G_PI;
|
|
|
|
g_signal_emit (action, rotate_signals[ROTATE], 0,
|
|
actor, angle,
|
|
&retval);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
clutter_rotate_action_gesture_cancel (ClutterGestureAction *action,
|
|
ClutterActor *actor)
|
|
{
|
|
gboolean retval;
|
|
|
|
g_signal_emit (action, rotate_signals[ROTATE], 0,
|
|
actor, (gdouble) 0.0,
|
|
&retval);
|
|
}
|
|
|
|
static void
|
|
clutter_rotate_action_class_init (ClutterRotateActionClass *klass)
|
|
{
|
|
ClutterGestureActionClass *gesture_class =
|
|
CLUTTER_GESTURE_ACTION_CLASS (klass);
|
|
|
|
g_type_class_add_private (klass, sizeof (ClutterRotateActionPrivate));
|
|
|
|
klass->rotate = clutter_rotate_action_real_rotate;
|
|
|
|
gesture_class->gesture_begin = clutter_rotate_action_gesture_begin;
|
|
gesture_class->gesture_progress = clutter_rotate_action_gesture_progress;
|
|
gesture_class->gesture_cancel = clutter_rotate_action_gesture_cancel;
|
|
|
|
/**
|
|
* ClutterRotateAction::rotate:
|
|
* @action: the #ClutterRotateAction that emitted the signal
|
|
* @actor: the #ClutterActor attached to the @action
|
|
* @angle: the difference of angle of rotation between the initial
|
|
* rotation and the current rotation
|
|
*
|
|
* The ::rotate signal is emitted when a rotate gesture is
|
|
* recognized on the attached actor and when the gesture is
|
|
* cancelled (in this case with an angle value of 0).
|
|
*
|
|
* Return value: %TRUE if the rotation should continue, and %FALSE if
|
|
* the rotation should be cancelled.
|
|
*
|
|
* Since: 1.12
|
|
*/
|
|
rotate_signals[ROTATE] =
|
|
g_signal_new (I_("rotate"),
|
|
G_TYPE_FROM_CLASS (klass),
|
|
G_SIGNAL_RUN_LAST,
|
|
G_STRUCT_OFFSET (ClutterRotateActionClass, rotate),
|
|
_clutter_boolean_continue_accumulator, NULL,
|
|
_clutter_marshal_BOOLEAN__OBJECT_DOUBLE,
|
|
G_TYPE_BOOLEAN, 2,
|
|
CLUTTER_TYPE_ACTOR,
|
|
G_TYPE_DOUBLE);
|
|
}
|
|
|
|
static void
|
|
clutter_rotate_action_init (ClutterRotateAction *self)
|
|
{
|
|
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, CLUTTER_TYPE_ROTATE_ACTION,
|
|
ClutterRotateActionPrivate);
|
|
|
|
clutter_gesture_action_set_n_touch_points (CLUTTER_GESTURE_ACTION (self), 2);
|
|
}
|
|
|
|
/**
|
|
* clutter_rotate_action_new:
|
|
*
|
|
* Creates a new #ClutterRotateAction instance
|
|
*
|
|
* Return value: the newly created #ClutterRotateAction
|
|
*
|
|
* Since: 1.12
|
|
*/
|
|
ClutterAction *
|
|
clutter_rotate_action_new (void)
|
|
{
|
|
return g_object_new (CLUTTER_TYPE_ROTATE_ACTION, NULL);
|
|
}
|