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++ // Copyright (C) 2021 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++ // Qt-Security score:significant reason:default
++
++
++ #include "qquick3dparticlegravity_p.h"
++
++ QT_BEGIN_NAMESPACE
++
++ /*!
++ \qmltype Gravity3D
++ \inherits Affector3D
++ \inqmlmodule QtQuick3D.Particles3D
++ \brief Accelerates particles to a vector of the specified magnitude in the specified direction.
++ \since 6.2
++
++ This element models the gravity of a massive object whose center of gravity is far away (and thus the
++ gravitational pull is effectively constant across the scene). To model the gravity of an object near
++ or inside the scene, use \l Attractor3D.
++ */
++
++ QQuick3DParticleGravity::QQuick3DParticleGravity(QQuick3DNode *parent)
++ : QQuick3DParticleAffector(parent)
++ {
++ }
++
++ /*!
++ \qmlproperty real Gravity3D::magnitude
++
++ This property defines the magnitude in position change per second. Negative magnitude
++ accelerates the opposite way from the \l {Gravity3D::direction}{direction}.
++
++ The default value is \c 100.0.
++ */
++ 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();
++ }
++
++ /*!
++ \qmlproperty vector3d Gravity3D::direction
++
++ This property defines the direction the gravity will affect toward. Values will be
++ automatically normalized to a unit vector.
++
++ The default value is \c (0.0, -1.0, 0.0) (downwards).
++ */
++ 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