qquickgravity.cpp

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// Copyright (C) 2021 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 <QtQml/qqmlinfo.h>
#include <QtCore/QtMath>
#include "qquickgravity_p.h"
QT_BEGIN_NAMESPACE
 
void QQuickGravityAffector::setMagnitude(qreal arg)
{
    if (m_magnitude != arg) {
        m_magnitude = arg;
        m_needRecalc = true;
        emit magnitudeChanged(arg);
    }
}
 
qreal QQuickGravityAffector::magnitude() const
{
    return m_magnitude;
}
 
 
void QQuickGravityAffector::setAcceleration(qreal arg)
{
    qmlWarning(this) << "The acceleration property is deprecated. Please use magnitude instead.";
    setMagnitude(arg);
}
 
void QQuickGravityAffector::setAngle(qreal arg)
{
    if (m_angle != arg) {
        m_angle = arg;
        m_needRecalc = true;
        emit angleChanged(arg);
    }
}
 
qreal QQuickGravityAffector::angle() const
{
    return m_angle;
}
 
QQuickGravityAffector::QQuickGravityAffector(QQuickItem *parent) :
    QQuickParticleAffector(parent), m_magnitude(-10), m_angle(90), m_needRecalc(true)
{
}
 
bool QQuickGravityAffector::affectParticle(QQuickParticleData *d, qreal dt)
{
    if (!m_magnitude)
        return false;
    if (m_needRecalc) {
        m_needRecalc = false;
        m_dx = m_magnitude * qCos(qDegreesToRadians(m_angle));
        m_dy = m_magnitude * qSin(qDegreesToRadians(m_angle));
    }
 
    d->setInstantaneousVX(d->curVX(m_system) + m_dx*dt, m_system);
    d->setInstantaneousVY(d->curVY(m_system) + m_dy*dt, m_system);
    return true;
}
 
 
 
QT_END_NAMESPACE
 
#include "moc_qquickgravity_p.cpp"