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Diffstat (limited to 'src/quick/particles/qquickage.cpp')
-rw-r--r-- | src/quick/particles/qquickage.cpp | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/quick/particles/qquickage.cpp b/src/quick/particles/qquickage.cpp new file mode 100644 index 0000000000..a71b9e2088 --- /dev/null +++ b/src/quick/particles/qquickage.cpp @@ -0,0 +1,112 @@ +/**************************************************************************** +** +** 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 |