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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 "wanderaffector.h"
#include "particlesystem.h"//for ParticlesVertices
QT_BEGIN_NAMESPACE
WanderAffector::WanderAffector(QSGItem *parent) :
ParticleAffector(parent)
{
m_needsReset = true;
}
WanderAffector::~WanderAffector()
{
for(QHash<int, WanderData*>::const_iterator iter=m_wanderData.constBegin();
iter != m_wanderData.constEnd(); iter++)
delete (*iter);
}
WanderData* WanderAffector::getData(int idx)
{
if(m_wanderData.contains(idx))
return m_wanderData[idx];
WanderData* d = new WanderData;
d->x_vel = 0;
d->y_vel = 0;
d->x_peak = m_xVariance;
d->y_peak = m_yVariance;
d->x_var = m_pace * qreal(qrand()) / RAND_MAX;
d->y_var = m_pace * qreal(qrand()) / RAND_MAX;
m_wanderData.insert(idx, d);
return d;
}
void WanderAffector::reset(int systemIdx)
{
if(m_wanderData.contains(systemIdx))
delete m_wanderData[systemIdx];
m_wanderData.remove(systemIdx);
}
bool WanderAffector::affectParticle(ParticleData* data, qreal dt)
{
WanderData* d = getData(data->systemIndex);
if (m_xVariance != 0.) {
if ((d->x_vel > d->x_peak && d->x_var > 0.0) || (d->x_vel < -d->x_peak && d->x_var < 0.0)) {
d->x_var = -d->x_var;
d->x_peak = m_xVariance + m_xVariance * qreal(qrand()) / RAND_MAX;
}
d->x_vel += d->x_var * dt;
}
qreal dx = dt * d->x_vel;
if (m_yVariance != 0.) {
if ((d->y_vel > d->y_peak && d->y_var > 0.0) || (d->y_vel < -d->y_peak && d->y_var < 0.0)) {
d->y_var = -d->y_var;
d->y_peak = m_yVariance + m_yVariance * qreal(qrand()) / RAND_MAX;
}
d->y_vel += d->y_var * dt;
}
qreal dy = dt * d->x_vel;
//### Should we be amending vel instead?
ParticleVertex* p = &(data->pv);
p->x += dx;
p->y += dy;
return true;
}
QT_END_NAMESPACE
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