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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Declarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickage_p.h"
+#include "qquickparticleemitter_p.h"
+QT_BEGIN_NAMESPACE
+/*!
+ \qmlclass Age QQuickAgeAffector
+ \inqmlmodule QtQuick.Particles 2
+ \inherits Affector
+ \brief The Age affector allows you to prematurely age particles
+
+ The Age affector allows you to alter where the particle is in its lifecycle. Common uses
+ are to expire particles prematurely, possibly giving them time to animate out.
+
+ The Age affector only applies to particles which are still alive.
+*/
+/*!
+ \qmlproperty int QtQuick.Particles2::Age::lifeLeft
+
+ The amount of life to set the particle to have. Affected particles
+ will advance to a point in their life where they will have this many
+ milliseconds left to live.
+*/
+
+/*!
+ \qmlproperty bool QtQuick.Particles2::Age::advancePosition
+
+ advancePosition determines whether position, veclocity and acceleration are included in
+ the simulated aging done by the affector. If advancePosition is false,
+ then the position, velocity and acceleration will remain the same and only
+ other attributes (such as opacity) will advance in the simulation to where
+ it would normally be for that point in the particle's life. With advancePosition set to
+ true the position, velocity and acceleration will also advance to where it would
+ normally be by that point in the particle's life, making it advance its position
+ on screen.
+
+ Default value is true.
+*/
+
+QQuickAgeAffector::QQuickAgeAffector(QQuickItem *parent) :
+ QQuickParticleAffector(parent), m_lifeLeft(0), m_advancePosition(true)
+{
+}
+
+
+bool QQuickAgeAffector::affectParticle(QQuickParticleData *d, qreal dt)
+{
+ Q_UNUSED(dt);
+ if (d->stillAlive()){
+ qreal curT = (qreal)m_system->timeInt/1000.0;
+ qreal ttl = (qreal)m_lifeLeft/1000.0;
+ if (!m_advancePosition && ttl > 0){
+ qreal x = d->curX();
+ qreal vx = d->curVX();
+ qreal ax = d->curAX();
+ qreal y = d->curY();
+ qreal vy = d->curVY();
+ qreal ay = d->curAY();
+ d->t = curT - (d->lifeSpan - ttl);
+ d->setInstantaneousX(x);
+ d->setInstantaneousVX(vx);
+ d->setInstantaneousAX(ax);
+ d->setInstantaneousY(y);
+ d->setInstantaneousVY(vy);
+ d->setInstantaneousAY(ay);
+ } else {
+ d->t = curT - (d->lifeSpan - ttl);
+ }
+ return true;
+ }
+ return false;
+}
+QT_END_NAMESPACE