qquickage.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qquickage_p.h"
#include "qquickparticleemitter_p.h"
QT_BEGIN_NAMESPACE
QQuickAgeAffector::QQuickAgeAffector(QQuickItem *parent) :
    QQuickParticleAffector(parent), m_lifeLeft(0), m_advancePosition(true)
{
}
 
 
bool QQuickAgeAffector::affectParticle(QQuickParticleData *d, qreal dt)
{
    Q_UNUSED(dt);
    if (d->stillAlive(m_system)){
        float curT = m_system->timeInt / 1000.0f;
        float ttl = m_lifeLeft / 1000.0f;
        if (!m_advancePosition && ttl > 0){
            float x = d->curX(m_system);
            float vx = d->curVX(m_system);
            float ax = d->curAX();
            float y = d->curY(m_system);
            float vy = d->curVY(m_system);
            float ay = d->curAY();
            d->t = curT - (d->lifeSpan - ttl);
            d->setInstantaneousX(x, m_system);
            d->setInstantaneousVX(vx, m_system);
            d->setInstantaneousAX(ax, m_system);
            d->setInstantaneousY(y, m_system);
            d->setInstantaneousVY(vy, m_system);
            d->setInstantaneousAY(ay, m_system);
        } else {
            d->t = curT - (d->lifeSpan - ttl);
        }
        return true;
    }
    return false;
}
QT_END_NAMESPACE
 
#include "moc_qquickage_p.cpp"