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Diffstat (limited to 'src/declarative/particles/qsgmove.cpp')
-rw-r--r-- | src/declarative/particles/qsgmove.cpp | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/declarative/particles/qsgmove.cpp b/src/declarative/particles/qsgmove.cpp new file mode 100644 index 0000000000..e885685d6d --- /dev/null +++ b/src/declarative/particles/qsgmove.cpp @@ -0,0 +1,131 @@ +/**************************************************************************** +** +** 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 "qsgmove_p.h" +#include <cmath> +QT_BEGIN_NAMESPACE +const qreal CONV = 0.017453292520444443; +/*! + \qmlclass Move QSGMoveAffector + \inqmlmodule QtQuick.Particles 2 + \inherits Affector + \brief The Move element allows you to set a new position, speed or acceleration on particles + + You'll often want to set the 'once' property to true for efficiency in the case where you just + want to set the parameter. Otherwise, the parameter will be needlessly set to the same thing + every simulation cycle. +*/ + +/*! + \qmlproperty StochasticDirection QtQuick.Particles2::Move::position + + Affected particles will have their position set to this direction, + relative to the ParticleSystem. When interpreting directions as points, + imagine it as an arrow with the base at the 0,0 of the ParticleSystem and the + tip at where the specified position will be. +*/ + +/*! + \qmlproperty StochasticDirection QtQuick.Particles2::Move::speed + + Affected particles will have their speed set to this direction. +*/ + + +/*! + \qmlproperty StochasticDirection QtQuick.Particles2::Move::acceleration + + Affected particles will have their acceleration set to this direction. +*/ + + +/*! + \qmlproperty bool QtQuick.Particles2::Move::relative + + Whether the affected particles have their existing position/speed/acceleration added + to the new one. +*/ + +QSGMoveAffector::QSGMoveAffector(QSGItem *parent) + : QSGParticleAffector(parent) + , m_position(&m_nullVector) + , m_speed(&m_nullVector) + , m_acceleration(&m_nullVector) + , m_relative(false) +{ +} + +bool QSGMoveAffector::affectParticle(QSGParticleData *d, qreal dt) +{ + Q_UNUSED(dt); + bool changed = false; + QPointF curPos(d->curX(), d->curY()); + + if (m_position != &m_nullVector){ + QPointF pos = m_position->sample(curPos); + if (m_relative) + pos += curPos; + d->setInstantaneousX(pos.x()); + d->setInstantaneousY(pos.y()); + changed = true; + } + + if (m_speed != &m_nullVector){ + QPointF pos = m_speed->sample(curPos); + if (m_relative) + pos += QPointF(d->curVX(), d->curVY()); + d->setInstantaneousVX(pos.x()); + d->setInstantaneousVY(pos.y()); + changed = true; + } + + if (m_acceleration != &m_nullVector){ + QPointF pos = m_acceleration->sample(curPos); + if (m_relative) + pos += QPointF(d->curAX(), d->curAY()); + d->setInstantaneousAX(pos.x()); + d->setInstantaneousAY(pos.y()); + changed = true; + } + + return changed; +} +QT_END_NAMESPACE |