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mutter/clutter/clutter-behaviour-ellipse.c

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/* -*- mode:C; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Tomas Frydrych <tf@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-ellipse
* @short_description: elliptic path behaviour.
*
* #ClutterBehaviourEllipse interpolates actors along a path defined by
* en ellipse.
*
* Each time the behaviour reaches a point on the path, the "knot-reached"
* signal is emitted.
*
* Since: 0.4
*/
#include "clutter-fixed.h"
#include "clutter-marshal.h"
#include "clutter-behaviour-ellipse.h"
#include "clutter-enum-types.h"
#include "clutter-private.h"
#include <stdlib.h>
#include <memory.h>
/****************************************************************************
* *
* ClutterBehaviourEllipse *
* *
****************************************************************************/
G_DEFINE_TYPE (ClutterBehaviourEllipse,
clutter_behaviour_ellipse,
CLUTTER_TYPE_BEHAVIOUR);
#define CLUTTER_BEHAVIOUR_ELLIPSE_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
CLUTTER_TYPE_BEHAVIOUR_ELLIPSE, \
ClutterBehaviourEllipsePrivate))
enum
{
KNOT_REACHED,
LAST_SIGNAL
};
static guint ellipse_signals[LAST_SIGNAL] = { 0, };
enum
{
PROP_0,
PROP_CENTER,
PROP_WIDTH,
PROP_HEIGHT,
PROP_ANGLE_BEGIN,
PROP_ANGLE_END,
PROP_ANGLE_TILT,
};
struct _ClutterBehaviourEllipsePrivate
{
/*
* Ellipse center
*/
ClutterKnot center;
gint a;
gint b;
ClutterAngle angle_begin;
ClutterAngle angle_end;
ClutterAngle angle_tilt;
};
static void
clutter_behaviour_ellipse_finalize (GObject *object)
{
G_OBJECT_CLASS (clutter_behaviour_ellipse_parent_class)->finalize (object);
}
static void
clutter_behaviour_ellipse_advance (ClutterBehaviourEllipse * e,
ClutterAngle angle,
ClutterKnot * knot)
{
gint x = CFX_INT (e->priv->a * clutter_cosi (angle));
gint y = CFX_INT (e->priv->b * clutter_sini (angle));
if (e->priv->angle_tilt)
{
/* Problem: sqrti is not giving us sufficient precission here
* and ClutterFixed range is too small to hold x^2+y^2 even for
* reasonable x, y values.
*
* We take advantage of sqrt (a * b^2) == sqrt (a) * b,
* and divide repeatedly by 4 until we get it into range, and then
* multiply the result by 2 the same number of times.
*/
ClutterFixed r;
guint q = x*x + y*y;
gint shift = 0;
while (q > G_MAXINT16)
{
++shift;
q >>= 2;
}
r = clutter_sqrtx (CLUTTER_INT_TO_FIXED (q)) << shift;
x = CFX_INT (CFX_MUL (r, clutter_cosi (angle + e->priv->angle_tilt)));
y = CFX_INT (CFX_MUL (r, clutter_sini (angle + e->priv->angle_tilt)));
}
knot->x = x;
knot->y = y;
#if 0
g_debug ("advancing to angle %d [%d, %d] (a: %d, b: %d)",
angle, knot->x, knot->y, e->priv->a, e->priv->b);
#endif
}
static void
actor_apply_knot_foreach (ClutterBehaviour *behave,
ClutterActor *actor,
gpointer data)
{
ClutterKnot *knot = data;
clutter_actor_set_position (actor, knot->x, knot->y);
}
static void
clutter_behaviour_ellipse_alpha_notify (ClutterBehaviour * behave,
guint32 alpha)
{
ClutterKnot knot;
ClutterBehaviourEllipse * self = CLUTTER_BEHAVIOUR_ELLIPSE (behave);
ClutterAngle angle;
if (self->priv->angle_end >= self->priv->angle_begin)
{
angle = self->priv->angle_end - self->priv->angle_begin;
angle =
(angle * alpha) / CLUTTER_ALPHA_MAX_ALPHA + self->priv->angle_begin;
}
else
{
angle = self->priv->angle_begin - self->priv->angle_end;
angle =
self->priv->angle_begin - (angle * alpha) / CLUTTER_ALPHA_MAX_ALPHA;
}
clutter_behaviour_ellipse_advance (self, angle, &knot);
knot.x += self->priv->center.x;
knot.y += self->priv->center.y;
clutter_behaviour_actors_foreach (behave,
actor_apply_knot_foreach,
&knot);
g_signal_emit (behave, ellipse_signals[KNOT_REACHED], 0, &knot);
}
static void
clutter_behaviour_ellipse_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBehaviourEllipse * el = CLUTTER_BEHAVIOUR_ELLIPSE (gobject);
ClutterBehaviourEllipsePrivate *priv;
priv = CLUTTER_BEHAVIOUR_ELLIPSE (gobject)->priv;
switch (prop_id)
{
case PROP_ANGLE_BEGIN:
priv->angle_begin = g_value_get_int (value);
break;
case PROP_ANGLE_END:
priv->angle_end = g_value_get_int (value);
break;
case PROP_ANGLE_TILT:
priv->angle_tilt = g_value_get_int (value);
break;
case PROP_WIDTH:
priv->a = g_value_get_int (value) >> 1;
break;
case PROP_HEIGHT:
priv->b = g_value_get_int (value) >> 1;
break;
case PROP_CENTER:
{
ClutterKnot * k = g_value_get_boxed (value);
if (k)
clutter_behaviour_ellipse_set_center (el, k->x, k->y);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_behaviour_ellipse_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBehaviourEllipsePrivate *priv;
priv = CLUTTER_BEHAVIOUR_ELLIPSE (gobject)->priv;
switch (prop_id)
{
case PROP_ANGLE_BEGIN:
g_value_set_int (value, priv->angle_begin);
break;
case PROP_ANGLE_END:
g_value_set_int (value, priv->angle_end);
break;
case PROP_ANGLE_TILT:
g_value_set_int (value, priv->angle_tilt);
break;
case PROP_WIDTH:
g_value_set_int (value, 2 * priv->a);
break;
case PROP_HEIGHT:
g_value_set_int (value, 2 * priv->b);
break;
case PROP_CENTER:
g_value_set_boxed (value, &priv->center);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_behaviour_ellipse_class_init (ClutterBehaviourEllipseClass *klass)
{
GObjectClass * object_class = G_OBJECT_CLASS (klass);
ClutterBehaviourClass * behave_class = CLUTTER_BEHAVIOUR_CLASS (klass);
object_class->finalize = clutter_behaviour_ellipse_finalize;
object_class->set_property = clutter_behaviour_ellipse_set_property;
object_class->get_property = clutter_behaviour_ellipse_get_property;
behave_class->alpha_notify = clutter_behaviour_ellipse_alpha_notify;
/**
* ClutterBehaviourEllipse:angle-begin:
*
* The initial angle from where the rotation should begin.
*
* Since: 0.4
*/
g_object_class_install_property (object_class,
PROP_ANGLE_BEGIN,
g_param_spec_int ("angle-begin",
"Angle Begin",
"Initial angle",
0, G_MAXINT, 0,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourEllipse:angle-end:
*
* The final angle to where the rotation should end.
*
* Since: 0.4
*/
g_object_class_install_property (object_class,
PROP_ANGLE_END,
g_param_spec_int ("angle-end",
"Angle End",
"Final angle",
0, G_MAXINT, 1024,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourEllipse:angle-end:
*
* The final angle to where the rotation should end.
*
* Since: 0.4
*/
g_object_class_install_property (object_class,
PROP_ANGLE_TILT,
g_param_spec_int ("angle-tilt",
"Angle Tilt",
"Tilt of the ellipse",
0, G_MAXINT, 1024,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourEllipse:width:
*
* Width of the ellipse.
*
* Since: 0.4
*/
g_object_class_install_property (object_class,
PROP_WIDTH,
g_param_spec_int ("width",
"Width",
"Width of ellipse",
0, G_MAXINT, 100,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourEllipse:height:
*
* Height of the ellipse.
*
* Since: 0.4
*/
g_object_class_install_property (object_class,
PROP_HEIGHT,
g_param_spec_int ("height",
"Height",
"Height of ellipse",
0, G_MAXINT, 50,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourEllipse:center:
*
* The center of the ellipse.
*
* Since: 0.4
*/
g_object_class_install_property (object_class,
PROP_CENTER,
g_param_spec_boxed ("center",
"Center",
"Center of ellipse",
CLUTTER_TYPE_KNOT,
CLUTTER_PARAM_READWRITE));
/**
* ClutterBehaviourEllipse::knot-reached:
* @ellipse: the object which received the signal
* @knot: the #ClutterKnot reached
*
* This signal is emitted at the end of each frame.
*
* Since: 0.4
*/
ellipse_signals[KNOT_REACHED] =
g_signal_new ("knot-reached",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterBehaviourEllipseClass, knot_reached),
NULL, NULL,
clutter_marshal_VOID__BOXED,
G_TYPE_NONE, 1,
CLUTTER_TYPE_KNOT);
g_type_class_add_private (klass, sizeof (ClutterBehaviourEllipsePrivate));
}
static void
clutter_behaviour_ellipse_init (ClutterBehaviourEllipse * self)
{
ClutterBehaviourEllipsePrivate *priv;
self->priv = priv = CLUTTER_BEHAVIOUR_ELLIPSE_GET_PRIVATE (self);
}
/**
* clutter_behaviour_ellipse_new:
* @alpha: a #ClutterAlpha, or %NULL
* @x: x coordinace of the center
* @y: y coordiance of the center
* @width: width of the ellipse
* @height: height of the ellipse
* @begin: angle in degrees at which movement begins
* @end: angle in degrees at which movement ends
* @tilt: angle in degrees with which the ellipse should be tilted around its
* center
*
* Creates a behaviour that drives actors along an elliptical path with
* given center, width and height; the movement begins at angle_begin and
* ends at angle_end; if angle_end > angle_begin, the movement is in
* counter-clockwise direction, clockwise other wise.
*
* Return value: a #ClutterBehaviour
*
* Since: 0.4
*/
ClutterBehaviour *
clutter_behaviour_ellipse_new (ClutterAlpha * alpha,
gint x,
gint y,
gint width,
gint height,
gdouble begin,
gdouble end,
gdouble tilt)
{
ClutterBehaviourEllipse *bc;
g_return_val_if_fail (alpha == NULL || CLUTTER_IS_ALPHA (alpha), NULL);
ClutterKnot center;
center.x = x;
center.y = y;
bc = g_object_new (CLUTTER_TYPE_BEHAVIOUR_ELLIPSE,
"alpha", alpha,
"center", &center,
"width", width,
"height", height,
"angle-begin", CLUTTER_ANGLE_FROM_DEG (begin),
"angle-end", CLUTTER_ANGLE_FROM_DEG (end),
"angle-tilt", CLUTTER_ANGLE_FROM_DEG (tilt),
NULL);
return CLUTTER_BEHAVIOUR (bc);
}
/**
* clutter_behaviour_ellipse_newx:
* @alpha: a #ClutterAlpha, or %NULL
* @x: x coordinace of the center
* @y: y coordiance of the center
* @width: width of the ellipse
* @height: height of the ellipse
* @begin: #ClutterFixed angle in degrees at which movement begins
* @end: #ClutterFixed angle in degrees at which movement ends
* @tilt: #ClutterFixed angle in degrees with which the ellipse should be tilted around its
* center
*
* Creates a behaviour that drives actors along an elliptical path with
* given center, width and height; the movement begins at angle_begin and
* ends at angle_end; if angle_end > angle_begin, the movement is in
* counter-clockwise direction, clockwise other wise.
*
* Return value: a #ClutterBehaviour
*
* Since: 0.4
*/
ClutterBehaviour *
clutter_behaviour_ellipse_newx (ClutterAlpha * alpha,
gint x,
gint y,
gint width,
gint height,
ClutterFixed begin,
ClutterFixed end,
ClutterFixed tilt)
{
ClutterBehaviourEllipse *bc;
g_return_val_if_fail (alpha == NULL || CLUTTER_IS_ALPHA (alpha), NULL);
ClutterKnot center;
center.x = x;
center.y = y;
bc = g_object_new (CLUTTER_TYPE_BEHAVIOUR_ELLIPSE,
"alpha", alpha,
"center", &center,
"width", width,
"height", height,
"angle-begin", CLUTTER_ANGLE_FROM_DEGX (begin),
"angle-end", CLUTTER_ANGLE_FROM_DEGX (end),
"angle-tilt", CLUTTER_ANGLE_FROM_DEGX (tilt),
NULL);
return CLUTTER_BEHAVIOUR (bc);
}
/**
* clutter_behaviour_ellipse_set_center
* @self: a #ClutterBehaviourEllipse
* @x: x coordinace of centre
* @y: y coordinace of centre
*
* Sets the center of the elliptical path to the point represented by knot.
*
* Since: 0.4
*/
void
clutter_behaviour_ellipse_set_center (ClutterBehaviourEllipse * self,
gint x,
gint y)
{
if (self->priv->center.x != x || self->priv->center.y != y)
{
g_object_ref (self);
self->priv->center.x = x;
self->priv->center.y = y;
g_object_notify (G_OBJECT (self), "center");
g_object_unref (self);
}
}
/**
* clutter_behaviour_ellipse_get_center
* @self: a #ClutterBehaviourEllipse
* @x: location to store the x coordinace of the center, or NULL
* @y: location to store the y coordinace of the center, or NULL
*
* Gets the center of the elliptical path path.
*
* Since: 0.4
*/
void
clutter_behaviour_ellipse_get_center (ClutterBehaviourEllipse * self,
gint * x,
gint * y)
{
if (x)
*x = self->priv->center.x;
if (y)
*y = self->priv->center.y;
}
/**
* clutter_behaviour_ellipse_set_width
* @self: a #ClutterBehaviourEllipse
* @width: width of the ellipse
*
* Sets the width of the elliptical path.
*
* Since: 0.4
*/
void
clutter_behaviour_ellipse_set_width (ClutterBehaviourEllipse * self,
gint width)
{
if (self->priv->a != width >> 1)
{
g_object_ref (self);
self->priv->a = width >> 1;
g_object_notify (G_OBJECT (self), "width");
g_object_unref (self);
}
}
/**
* clutter_behaviour_ellipse_get_width
* @self: a #ClutterBehaviourEllipse
*
* Gets the width of the elliptical path.
*
* Return: the width of the path
*
* Since: 0.4
*/
gint
clutter_behaviour_ellipse_get_width (ClutterBehaviourEllipse * self)
{
return self->priv->a << 1;
}
/**
* clutter_behaviour_ellipse_set_height
* @self: a #ClutterBehaviourEllipse
* @height: height of the ellipse
*
* Sets the height of the elliptical path.
*
* Since: 0.4
*/
void
clutter_behaviour_ellipse_set_height (ClutterBehaviourEllipse * self,
gint height)
{
if (self->priv->b != height >> 1)
{
g_object_ref (self);
self->priv->b = height >> 1;
g_object_notify (G_OBJECT (self), "height");
g_object_unref (self);
}
}
/**
* clutter_behaviour_ellipse_get_height
* @self: a #ClutterBehaviourEllipse
*
* Gets the height of the elliptical path.
*
* Return value: the height of the path
*
* Since: 0.4
*/
gint
clutter_behaviour_ellipse_get_height (ClutterBehaviourEllipse * self)
{
return self->priv->b << 1;
}
/**
* clutter_behaviour_ellipse_set_angle_begin
* @self: a #ClutterBehaviourEllipse
* @angle_begin: #ClutterAngle at which movement begins
*
* Sets the angle at which movement begins.
*
* Since: 0.4
*/
void
clutter_behaviour_ellipse_set_angle_begin (ClutterBehaviourEllipse * self,
ClutterAngle angle_begin)
{
if (self->priv->angle_begin != angle_begin)
{
g_object_ref (self);
self->priv->angle_begin = angle_begin;
g_object_notify (G_OBJECT (self), "angle-begin");
g_object_unref (self);
}
}
/**
* clutter_behaviour_ellipse_get_angle_begin
* @self: a #ClutterBehaviourEllipse
*
* Gets the angle at which movements begins.
*
* Return value: a #ClutterAngle
*
* Since: 0.4
*/
ClutterAngle
clutter_behaviour_ellipse_get_angle_begin (ClutterBehaviourEllipse * self)
{
return self->priv->angle_begin;
}
/**
* clutter_behaviour_ellipse_set_angle_end
* @self: a #ClutterBehaviourEllipse
* @angle_end: #ClutterAngle at which movement ends
*
* Sets the angle at which movement ends.
*
* Since: 0.4
*/
void
clutter_behaviour_ellipse_set_angle_end (ClutterBehaviourEllipse * self,
ClutterAngle angle_end)
{
if (self->priv->angle_end != angle_end)
{
g_object_ref (self);
self->priv->angle_end = angle_end;
g_object_notify (G_OBJECT (self), "angle-end");
g_object_unref (self);
}
}
/**
* clutter_behaviour_ellipse_get_angle_end
* @self: a #ClutterBehaviourEllipse
*
* Gets the at which movements ends.
*
* Return value: a #ClutterAngle
*
* Since: 0.4
*/
ClutterAngle
clutter_behaviour_ellipse_get_angle_end (ClutterBehaviourEllipse * self)
{
return self->priv->angle_end;
}
/**
* clutter_behaviour_ellipse_set_angle_tilt
* @self: a #ClutterBehaviourEllipse
* @angle_end: #ClutterAngle tilt of the elipse around the center
*
* Sets the angle at which the ellipse should be tilted around it's center.
*
* Since: 0.4
*/
void
clutter_behaviour_ellipse_set_angle_tilt (ClutterBehaviourEllipse * self,
ClutterAngle angle_tilt)
{
if (self->priv->angle_tilt != angle_tilt)
{
g_object_ref (self);
self->priv->angle_tilt = angle_tilt;
g_object_notify (G_OBJECT (self), "angle-tilt");
g_object_unref (self);
}
}
/**
* clutter_behaviour_ellipse_get_angle_tilt
* @self: a #ClutterBehaviourEllipse
*
* Gets the tilt of the ellipse around the center.
*
* Return value: a #ClutterAngle
*
* Since: 0.4
*/
ClutterAngle
clutter_behaviour_ellipse_get_angle_tilt (ClutterBehaviourEllipse * self)
{
return self->priv->angle_tilt;
}
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