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Diffstat (limited to 'src/quick/particles/qquickcustomaffector.cpp')
| -rw-r--r-- | src/quick/particles/qquickcustomaffector.cpp | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/src/quick/particles/qquickcustomaffector.cpp b/src/quick/particles/qquickcustomaffector.cpp new file mode 100644 index 0000000000..80e2eaf268 --- /dev/null +++ b/src/quick/particles/qquickcustomaffector.cpp @@ -0,0 +1,211 @@ +/**************************************************************************** +** +** 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 "qquickcustomaffector_p.h" +#include <private/qv8engine_p.h> +#include <private/qdeclarativeengine_p.h> +#include <QDeclarativeEngine> +#include <QDebug> +QT_BEGIN_NAMESPACE + +//TODO: Move docs (and inheritence) to real base when docs can propagate. Currently this pretends to be the base class! +/*! + \qmlsignal QtQuick.Particles2::Affector::affectParticles(Array particles, real dt) + + This handler is called when particles are selected to be affected. particles contains + an array of particle objects which can be directly manipulated. + + dt is the time since the last time it was affected. Use dt to normalize + trajectory manipulations to real time. + + Note that JS is slower to execute, so it is not recommended to use this in + high-volume particle systems. +*/ + +/*! + \qmlproperty StochasticDirection QtQuick.Particles2::Affector::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::Affector::speed + + Affected particles will have their speed set to this direction. +*/ + + +/*! + \qmlproperty StochasticDirection QtQuick.Particles2::Affector::acceleration + + Affected particles will have their acceleration set to this direction. +*/ + + +/*! + \qmlproperty bool QtQuick.Particles2::Affector::relative + + Whether the affected particles have their existing position/speed/acceleration added + to the new one. + + Default is true. +*/ +QQuickCustomAffector::QQuickCustomAffector(QQuickItem *parent) : + QQuickParticleAffector(parent) + , m_position(&m_nullVector) + , m_speed(&m_nullVector) + , m_acceleration(&m_nullVector) + , m_relative(true) +{ +} + +bool QQuickCustomAffector::isAffectConnected() +{ + static int idx = QObjectPrivate::get(this)->signalIndex("affectParticles(QDeclarativeV8Handle,qreal)"); + return QObjectPrivate::get(this)->isSignalConnected(idx); +} + +void QQuickCustomAffector::affectSystem(qreal dt) +{ + if (!isAffectConnected()) { + QQuickParticleAffector::affectSystem(dt); + return; + } + if (!m_enabled) + return; + updateOffsets(); + + QList<QQuickParticleData*> toAffect; + foreach (QQuickParticleGroupData* gd, m_system->groupData) + if (activeGroup(m_system->groupData.key(gd))) + foreach (QQuickParticleData* d, gd->data) + if (shouldAffect(d)) + toAffect << d; + + if (toAffect.isEmpty()) + return; + + if (m_onceOff) + dt = 1.0; + + v8::HandleScope handle_scope; + v8::Context::Scope scope(QDeclarativeEnginePrivate::getV8Engine(qmlEngine(this))->context()); + v8::Handle<v8::Array> array = v8::Array::New(toAffect.size()); + for (int i=0; i<toAffect.size(); i++) + array->Set(i, toAffect[i]->v8Value().toHandle()); + + if (dt >= simulationCutoff || dt <= simulationDelta) { + affectProperties(toAffect, dt); + emit affectParticles(QDeclarativeV8Handle::fromHandle(array), dt); + } else { + int realTime = m_system->timeInt; + m_system->timeInt -= dt * 1000.0; + while (dt > simulationDelta) { + m_system->timeInt += simulationDelta * 1000.0; + dt -= simulationDelta; + affectProperties(toAffect, simulationDelta); + emit affectParticles(QDeclarativeV8Handle::fromHandle(array), simulationDelta); + } + m_system->timeInt = realTime; + if (dt > 0.0) { + affectProperties(toAffect, dt); + emit affectParticles(QDeclarativeV8Handle::fromHandle(array), dt); + } + } + + foreach (QQuickParticleData* d, toAffect) + if (d->update == 1.0) + postAffect(d); +} + +bool QQuickCustomAffector::affectParticle(QQuickParticleData *d, qreal dt) +{ + //This does the property based affecting, called by superclass if signal isn't hooked up. + bool changed = false; + QPointF curPos(d->curX(), d->curY()); + + if (m_acceleration != &m_nullVector){ + QPointF pos = m_acceleration->sample(curPos); + if (m_relative) { + pos *= dt; + pos += QPointF(d->curAX(), d->curAY()); + } + d->setInstantaneousAX(pos.x()); + d->setInstantaneousAY(pos.y()); + changed = true; + } + + if (m_speed != &m_nullVector){ + QPointF pos = m_speed->sample(curPos); + if (m_relative) { + pos *= dt; + pos += QPointF(d->curVX(), d->curVY()); + } + d->setInstantaneousVX(pos.x()); + d->setInstantaneousVY(pos.y()); + changed = true; + } + + if (m_position != &m_nullVector){ + QPointF pos = m_position->sample(curPos); + if (m_relative) { + pos *= dt; + pos += curPos; + } + d->setInstantaneousX(pos.x()); + d->setInstantaneousY(pos.y()); + changed = true; + } + + return changed; +} + +void QQuickCustomAffector::affectProperties(const QList<QQuickParticleData*> particles, qreal dt) +{ + foreach (QQuickParticleData* d, particles) + if ( affectParticle(d, dt) ) + d->update = 1.0; +} + +QT_END_NAMESPACE |