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Diffstat (limited to 'src/imports/particles/gravityaffector.cpp')
-rw-r--r-- | src/imports/particles/gravityaffector.cpp | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/imports/particles/gravityaffector.cpp b/src/imports/particles/gravityaffector.cpp new file mode 100644 index 0000000000..02edbacd68 --- /dev/null +++ b/src/imports/particles/gravityaffector.cpp @@ -0,0 +1,77 @@ +/**************************************************************************** +** +** 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, 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. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "gravityaffector.h" +#include <cmath> +QT_BEGIN_NAMESPACE +const qreal CONV = 0.017453292520444443; +GravityAffector::GravityAffector(QSGItem *parent) : + ParticleAffector(parent), m_acceleration(-10), m_angle(90), m_xAcc(0), m_yAcc(0) +{ + connect(this, SIGNAL(accelerationChanged(qreal)), + this, SLOT(recalc())); + connect(this, SIGNAL(angleChanged(qreal)), + this, SLOT(recalc())); + recalc(); +} + +void GravityAffector::recalc() +{ + qreal theta = m_angle * CONV; + m_xAcc = m_acceleration * cos(theta); + m_yAcc = m_acceleration * sin(theta); +} + +bool GravityAffector::affectParticle(ParticleData *d, qreal dt) +{ + Q_UNUSED(dt); + bool changed = false; + if(d->pv.ax != m_xAcc){ + d->setInstantaneousAX(m_xAcc); + changed = true; + } + if(d->pv.ay != m_yAcc){ + d->setInstantaneousAY(m_yAcc); + changed = true; + } + return changed; +} +QT_END_NAMESPACE |