491e3ca9d2
* clutter/clutter-alpha.c:
* clutter/clutter-behaviour-opacity.c:
More docs.
* clutter/clutter-behaviour-path.h:
* clutter/clutter-behaviour-path.c:
More docs, add clutter_behaviour_path_insert_knot(),
clutter_behaviour_path_remove_knot()
* clutter/clutter-behaviour-scale.h:
* clutter/clutter-behaviour-scale.c:
More docs, add clutter_behaviour_scale_newx() taking fixed values.
* clutter/Makefile.am:
* clutter/pango/Makefile.am:
Fix linking warning.
148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2006 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:clutter-behaviour-opacity
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* @short_description: A behaviour class interpolating actors opacity between
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* two values.
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*
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* #ClutterBehaviourPath interpolates actors opacity between two values.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "clutter-actor.h"
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#include "clutter-behaviour.h"
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#include "clutter-behaviour-opacity.h"
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#include "clutter-enum-types.h"
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#include "clutter-main.h"
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#include <math.h>
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G_DEFINE_TYPE (ClutterBehaviourOpacity,
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clutter_behaviour_opacity,
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CLUTTER_TYPE_BEHAVIOUR);
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struct _ClutterBehaviourOpacityPrivate
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{
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guint8 opacity_start;
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guint8 opacity_end;
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};
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#define CLUTTER_BEHAVIOUR_OPACITY_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
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CLUTTER_TYPE_BEHAVIOUR_OPACITY, \
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ClutterBehaviourOpacityPrivate))
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static void
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clutter_behaviour_opacity_frame_foreach (ClutterActor *actor,
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ClutterBehaviourOpacity *behave)
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{
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guint32 alpha;
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guint8 opacity;
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ClutterBehaviourOpacityPrivate *priv;
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ClutterBehaviour *_behave;
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priv = CLUTTER_BEHAVIOUR_OPACITY_GET_PRIVATE (behave);
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_behave = CLUTTER_BEHAVIOUR (behave);
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alpha = clutter_alpha_get_alpha (clutter_behaviour_get_alpha (_behave));
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opacity = (alpha * (priv->opacity_end - priv->opacity_start))
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/ CLUTTER_ALPHA_MAX_ALPHA;
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opacity += priv->opacity_start;
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CLUTTER_DBG ("alpha %i opacity %i\n", alpha, opacity);
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clutter_actor_set_opacity (actor, opacity);
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}
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static void
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clutter_behaviour_alpha_notify (ClutterBehaviour *behave)
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{
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clutter_behaviour_actors_foreach (behave,
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(GFunc)clutter_behaviour_opacity_frame_foreach,
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CLUTTER_BEHAVIOUR_OPACITY (behave));
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}
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static void
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clutter_behaviour_opacity_finalize (GObject *object)
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{
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G_OBJECT_CLASS (clutter_behaviour_opacity_parent_class)->finalize (object);
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}
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static void
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clutter_behaviour_opacity_class_init (ClutterBehaviourOpacityClass *klass)
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{
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ClutterBehaviourClass *behave_class;
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behave_class = (ClutterBehaviourClass*) klass;
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behave_class->alpha_notify = clutter_behaviour_alpha_notify;
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g_type_class_add_private (klass, sizeof (ClutterBehaviourOpacityPrivate));
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}
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static void
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clutter_behaviour_opacity_init (ClutterBehaviourOpacity *self)
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{
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self->priv = CLUTTER_BEHAVIOUR_OPACITY_GET_PRIVATE (self);
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}
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/**
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* clutter_behaviour_opacity_new :
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* @alpha: a #ClutterAlpha
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* @scale_begin: initial opacity value
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* @scale_end: final opacity value
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*
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* Creates a new #ClutterBehaviourOpacity instance.
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*
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* Return value: the newly created #ClutterBehaviourOpacity
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*
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* Since: 0.2
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*/
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ClutterBehaviour*
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clutter_behaviour_opacity_new (ClutterAlpha *alpha,
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guint8 opacity_start,
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guint8 opacity_end)
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{
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ClutterBehaviourOpacity *behave;
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behave = g_object_new (CLUTTER_TYPE_BEHAVIOUR_OPACITY,
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"alpha", alpha,
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NULL);
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behave->priv->opacity_start = opacity_start;
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behave->priv->opacity_end = opacity_end;
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return CLUTTER_BEHAVIOUR (behave);
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}
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