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364 lines
10 KiB
C
364 lines
10 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-scale
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* @short_description: A behaviour class interpolating actors size between
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* two values.
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*
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* A #ClutterBehaviourScale interpolates actors size 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-enum-types.h"
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#include "clutter-main.h"
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#include "clutter-fixed.h"
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#include "clutter-behaviour-scale.h"
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#include "clutter-private.h"
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#include "clutter-debug.h"
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#include <math.h>
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G_DEFINE_TYPE (ClutterBehaviourScale,
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clutter_behaviour_scale,
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CLUTTER_TYPE_BEHAVIOUR);
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struct _ClutterBehaviourScalePrivate
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{
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ClutterFixed scale_begin;
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ClutterFixed scale_end;
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ClutterGravity gravity;
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};
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#define CLUTTER_BEHAVIOUR_SCALE_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
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CLUTTER_TYPE_BEHAVIOUR_SCALE, \
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ClutterBehaviourScalePrivate))
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enum
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{
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PROP_0,
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PROP_SCALE_BEGIN,
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PROP_SCALE_END,
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PROP_SCALE_GRAVITY
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};
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static void
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scale_frame_foreach (ClutterBehaviour *behaviour,
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ClutterActor *actor,
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gpointer data)
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{
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ClutterBehaviourScalePrivate *priv =
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CLUTTER_BEHAVIOUR_SCALE (behaviour)->priv;
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ClutterFixed scale = GPOINTER_TO_UINT (data);
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ClutterGravity gravity = priv->gravity;
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clutter_actor_scalex (actor, scale, scale, gravity);
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}
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static void
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clutter_behaviour_scale_alpha_notify (ClutterBehaviour *behave,
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guint32 alpha_value)
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{
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ClutterFixed scale, factor;
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ClutterBehaviourScalePrivate *priv;
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priv = CLUTTER_BEHAVIOUR_SCALE (behave)->priv;
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factor = CLUTTER_INT_TO_FIXED (alpha_value) / CLUTTER_ALPHA_MAX_ALPHA;
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scale = CLUTTER_FIXED_MUL (factor, (priv->scale_end - priv->scale_begin));
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scale += priv->scale_begin;
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clutter_behaviour_actors_foreach (behave,
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scale_frame_foreach,
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GUINT_TO_POINTER (scale));
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}
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static void
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clutter_behaviour_scale_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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ClutterBehaviourScalePrivate *priv;
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priv = CLUTTER_BEHAVIOUR_SCALE (gobject)->priv;
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switch (prop_id)
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{
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case PROP_SCALE_BEGIN:
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priv->scale_begin = CLUTTER_FLOAT_TO_FIXED (g_value_get_double (value));
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break;
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case PROP_SCALE_END:
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priv->scale_end = CLUTTER_FLOAT_TO_FIXED (g_value_get_double (value));
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break;
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case PROP_SCALE_GRAVITY:
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priv->gravity = g_value_get_enum (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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clutter_behaviour_scale_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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ClutterBehaviourScalePrivate *priv;
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priv = CLUTTER_BEHAVIOUR_SCALE (gobject)->priv;
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switch (prop_id)
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{
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case PROP_SCALE_BEGIN:
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g_value_set_double (value, CLUTTER_FIXED_TO_FLOAT (priv->scale_begin));
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break;
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case PROP_SCALE_END:
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g_value_set_double (value, CLUTTER_FIXED_TO_FLOAT (priv->scale_end));
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break;
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case PROP_SCALE_GRAVITY:
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g_value_set_enum (value, priv->gravity);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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clutter_behaviour_scale_class_init (ClutterBehaviourScaleClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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ClutterBehaviourClass *behave_class = CLUTTER_BEHAVIOUR_CLASS (klass);
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gobject_class->set_property = clutter_behaviour_scale_set_property;
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gobject_class->get_property = clutter_behaviour_scale_get_property;
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/**
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* ClutterBehaviourScale:scale-begin:
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*
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* The initial scaling factor for the actors.
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*
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* Since: 0.2
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*/
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g_object_class_install_property (gobject_class,
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PROP_SCALE_BEGIN,
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g_param_spec_double ("scale-begin",
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"Scale Begin",
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"Initial scale",
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0.0, G_MAXDOUBLE,
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1.0,
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CLUTTER_PARAM_READWRITE));
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/**
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* ClutterBehaviourScale:scale-end:
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*
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* The final scaling factor for the actors.
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*
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* Since: 0.2
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*/
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g_object_class_install_property (gobject_class,
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PROP_SCALE_END,
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g_param_spec_double ("scale-end",
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"Scale End",
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"Final scale",
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0.0, G_MAXDOUBLE,
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1.0,
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CLUTTER_PARAM_READWRITE));
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/**
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* ClutterBehaviourScale:gravity:
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*
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* The gravity of the scaling.
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*
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* Since: 0.2
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*/
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g_object_class_install_property (gobject_class,
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PROP_SCALE_GRAVITY,
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g_param_spec_enum ("scale-gravity",
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"Scale Gravity",
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"The gravity of the scaling",
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CLUTTER_TYPE_GRAVITY,
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CLUTTER_GRAVITY_CENTER,
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CLUTTER_PARAM_READWRITE));
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behave_class->alpha_notify = clutter_behaviour_scale_alpha_notify;
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g_type_class_add_private (klass, sizeof (ClutterBehaviourScalePrivate));
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}
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static void
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clutter_behaviour_scale_init (ClutterBehaviourScale *self)
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{
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ClutterBehaviourScalePrivate *priv;
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self->priv = priv = CLUTTER_BEHAVIOUR_SCALE_GET_PRIVATE (self);
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}
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/**
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* clutter_behaviour_scale_new:
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* @alpha: a #ClutterAlpha
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* @scale_begin: initial scale factor
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* @scale_end: final scale factor
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* @gravity: FIXME: Not currently implemented
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*
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* Creates a new #ClutterBehaviourScale instance.
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*
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* Return value: the newly created #ClutterBehaviourScale
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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_scale_new (ClutterAlpha *alpha,
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gdouble scale_begin,
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gdouble scale_end,
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ClutterGravity gravity)
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{
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g_return_val_if_fail (alpha == NULL || CLUTTER_IS_ALPHA (alpha), NULL);
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return clutter_behaviour_scale_newx (alpha,
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CLUTTER_FLOAT_TO_FIXED (scale_begin),
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CLUTTER_FLOAT_TO_FIXED (scale_end),
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gravity);
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}
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/**
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* clutter_behaviour_scale_newx:
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* @alpha: a #ClutterAlpha
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* @scale_begin: initial scale factor
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* @scale_end: final scale factor
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* @gravity: FIXME: Not currently implemented
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*
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* A fixed point implementation of clutter_behaviour_scale_new()
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*
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* Return value: the newly created #ClutterBehaviourScale
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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_scale_newx (ClutterAlpha *alpha,
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ClutterFixed scale_begin,
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ClutterFixed scale_end,
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ClutterGravity gravity)
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{
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ClutterBehaviourScale *behave;
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g_return_val_if_fail (alpha == NULL || CLUTTER_IS_ALPHA (alpha), NULL);
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behave = g_object_new (CLUTTER_TYPE_BEHAVIOUR_SCALE,
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"alpha", alpha,
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NULL);
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behave->priv->scale_begin = scale_begin;
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behave->priv->scale_end = scale_end;
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behave->priv->gravity = gravity;
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return CLUTTER_BEHAVIOUR (behave);
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}
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/**
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* clutter_behaviour_scale_get_bounds:
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* @scale: a #ClutterBehaviourScale
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* @scale_begin: return location for the initial scale factor
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* @scale_end: return location for the final scale factor
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*
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* Retrieves the bounds used by scale behaviour.
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*
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* Since: 0.4
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*/
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void
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clutter_behaviour_scale_get_bounds (ClutterBehaviourScale *scale,
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gdouble *scale_begin,
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gdouble *scale_end)
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{
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ClutterBehaviourScalePrivate *priv;
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g_return_if_fail (CLUTTER_IS_BEHAVIOUR_SCALE (scale));
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priv = scale->priv;
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if (scale_begin)
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*scale_begin = CLUTTER_FIXED_TO_DOUBLE (priv->scale_begin);
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if (scale_end)
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*scale_end = CLUTTER_FIXED_TO_DOUBLE (priv->scale_end);
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}
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/**
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* clutter_behaviour_scale_get_boundsx:
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* @scale: a #ClutterBehaviourScale
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* @scale_begin: return location for the initial scale factor
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* @scale_end: return location for the final scale factor
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*
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* Retrieves the bounds used by scale behaviour.
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*
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* Since: 0.4
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*/
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void
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clutter_behaviour_scale_get_boundsx (ClutterBehaviourScale *scale,
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ClutterFixed *scale_begin,
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ClutterFixed *scale_end)
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{
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ClutterBehaviourScalePrivate *priv;
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g_return_if_fail (CLUTTER_IS_BEHAVIOUR_SCALE (scale));
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priv = scale->priv;
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if (scale_begin)
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*scale_begin = priv->scale_begin;
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if (scale_end)
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*scale_end = priv->scale_end;
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}
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/**
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* clutter_behaviour_scale_get_gravity:
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* @scale: a #ClutterBehaviourScale
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*
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* Retrieves the #ClutterGravity applied by the scale behaviour.
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*
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* Return value: the gravity used by the behaviour
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*
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* Since: 0.4
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*/
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ClutterGravity
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clutter_behaviour_scale_get_gravity (ClutterBehaviourScale *scale)
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{
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g_return_val_if_fail (CLUTTER_IS_BEHAVIOUR_SCALE (scale), CLUTTER_GRAVITY_NONE);
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return scale->priv->gravity;
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}
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