qquick3dparticlegravity.cpp

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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
#include "qquick3dparticlegravity_p.h"
 
QT_BEGIN_NAMESPACE
 
QQuick3DParticleGravity::QQuick3DParticleGravity(QQuick3DNode *parent)
    : QQuick3DParticleAffector(parent)
{
}
 
float QQuick3DParticleGravity::magnitude() const
{
    return m_magnitude;
}
 
void QQuick3DParticleGravity::setMagnitude(float magnitude)
{
    if (qFuzzyCompare(m_magnitude, magnitude))
        return;
 
    m_magnitude = magnitude;
    Q_EMIT magnitudeChanged();
    Q_EMIT update();
}
 
const QVector3D &QQuick3DParticleGravity::direction() const
{
    return m_direction;
}
 
void QQuick3DParticleGravity::setDirection(const QVector3D &direction)
{
    if (m_direction == direction)
        return;
 
    m_direction = direction;
    m_directionNormalized = m_direction.normalized();
    Q_EMIT directionChanged();
    Q_EMIT update();
}
 
void QQuick3DParticleGravity::affectParticle(const QQuick3DParticleData &sd, QQuick3DParticleDataCurrent *d, float time)
{
    Q_UNUSED(sd);
    float velocity = 0.5f * m_magnitude * (time * time);
    d->position += velocity * m_directionNormalized;
}
 
QT_END_NAMESPACE