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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.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 "qsgparticleaffector_p.h"
#include <QDebug>
QT_BEGIN_NAMESPACE
QSGParticleAffector::QSGParticleAffector(QSGItem *parent) :
QSGItem(parent), m_needsReset(false), m_system(0), m_active(true)
, m_updateIntSet(false), m_shape(new QSGParticleExtruder(this)), m_signal(false)
{
connect(this, SIGNAL(systemChanged(QSGParticleSystem*)),
this, SLOT(updateOffsets()));
connect(this, SIGNAL(xChanged()),
this, SLOT(updateOffsets()));
connect(this, SIGNAL(yChanged()),
this, SLOT(updateOffsets()));//TODO: in componentComplete and all relevant signals
}
void QSGParticleAffector::componentComplete()
{
if (!m_system && qobject_cast<QSGParticleSystem*>(parentItem()))
setSystem(qobject_cast<QSGParticleSystem*>(parentItem()));
if (!m_system)
qWarning() << "Affector created without a particle system specified";//TODO: useful QML warnings, like line number?
QSGItem::componentComplete();
}
void QSGParticleAffector::affectSystem(qreal dt)
{
if (!m_active)
return;
//If not reimplemented, calls affect particle per particle
//But only on particles in targeted system/area
if (m_updateIntSet){
m_groups.clear();
foreach (const QString &p, m_particles)
m_groups << m_system->m_groupIds[p];//###Can this occur before group ids are properly assigned?
m_updateIntSet = false;
}
foreach (QSGParticleGroupData* gd, m_system->m_groupData){
foreach (QSGParticleData* d, gd->data){
if (!d)
continue;
if (m_groups.isEmpty() || m_groups.contains(d->group)){
if ((m_onceOff && m_onceOffed.contains(qMakePair(d->group, d->index)))
|| !d->stillAlive())
continue;
//Need to have previous location for affected. if signal || shape might be faster?
QPointF curPos = QPointF(d->curX(), d->curY());
if (width() == 0 || height() == 0
|| m_shape->contains(QRectF(m_offset.x(), m_offset.y(), width(), height()),curPos)){
if (m_collisionParticles.isEmpty() || isColliding(d)){
if (affectParticle(d, dt)){
m_system->m_needsReset << d;
if (m_onceOff)
m_onceOffed << qMakePair(d->group, d->index);
if (m_signal)
emit affected(curPos.x(), curPos.y());
}
}
}
}
}
}
}
bool QSGParticleAffector::affectParticle(QSGParticleData *d, qreal dt)
{
Q_UNUSED(d);
Q_UNUSED(dt);
return m_signal;//If signalling, then we always 'null affect' it.
}
void QSGParticleAffector::reset(QSGParticleData* pd)
{//TODO: This, among other ones, should be restructured so they don't all need to remember to call the superclass
if (m_onceOff)
if (m_groups.isEmpty() || m_groups.contains(pd->group))
m_onceOffed.remove(qMakePair(pd->group, pd->index));
}
void QSGParticleAffector::updateOffsets()
{
if (m_system)
m_offset = m_system->mapFromItem(this, QPointF(0, 0));
}
bool QSGParticleAffector::isColliding(QSGParticleData *d)
{
qreal myCurX = d->curX();
qreal myCurY = d->curY();
qreal myCurSize = d->curSize()/2;
foreach (const QString &group, m_collisionParticles){
foreach (QSGParticleData* other, m_system->m_groupData[m_system->m_groupIds[group]]->data){
if (!other->stillAlive())
continue;
qreal otherCurX = other->curX();
qreal otherCurY = other->curY();
qreal otherCurSize = other->curSize()/2;
if ((myCurX + myCurSize > otherCurX - otherCurSize
&& myCurX - myCurSize < otherCurX + otherCurSize)
&& (myCurY + myCurSize > otherCurY - otherCurSize
&& myCurY - myCurSize < otherCurY + otherCurSize))
return true;
}
}
return false;
}
QT_END_NAMESPACE
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