/****************************************************************************
**
** Copyright (C) 2018 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qraycaster.h"
#include "qabstractraycaster_p.h"
#include <Qt3DCore/qentity.h>
#include <Qt3DCore/private/qcomponent_p.h>
#include <Qt3DCore/private/qscene_p.h>

QT_BEGIN_NAMESPACE

namespace Qt3DRender {

/*!
    \class Qt3DRender::QRayCaster
    \inmodule Qt3DRender

    \brief Qt3DRender::QRayCaster is used to perform ray casting tests in 3d world coordinates.
    \inmodule Qt3DRender
    \since 5.11
    \inherits QAbstractRayCaster

    The 3d ray is defined by its origin, direction and length. It will be affected by the
    transformations applied to the entity it belongs to.

    Ray casting tests will be performed every frame as long as the component is enabled.
    The hits property will be updated with the list of intersections.

    \sa QAbstractRayCaster, QScreenRayCaster, QNoPicking
*/
/*!
    \qmltype RayCaster
    \brief used to perform ray casting tests in 3d world coordinates.
    \inqmlmodule Qt3D.Render
    \since 5.11
    \instantiates Qt3DRender::QRayCaster

    The 3d ray is defined by its origin, direction and length. It will be affected by the
    transformations applied to the entity it belongs to.

    Ray casting tests will be performed every frame as long as the component is enabled.
    The hits property will be updated with the list of intersections.

    \sa AbstractRayCaster, ScreenRayCaster, NoPicking
*/

/*!
    \property Qt3DRender::QRayCaster::origin

    Holds the origin of the 3D ray in local coordinates.
*/
/*!
    \qmlproperty vector3d Qt3D.Render::RayCaster::origin

    Holds the origin of the 3D ray in local coordinates.
*/

/*!
    \property Qt3DRender::QRayCaster::direction

    Holds the direction of the 3D ray. This should be a unit vector.
*/

/*!
    \qmlproperty vector3D Qt3D.Render::RayCaster::direction

    Holds the direction of the 3D ray. This should be a unit vector.
*/

/*!
    \property Qt3DRender::QRayCaster::length

    Holds the length of the 3D ray.
*/

/*!
    \qmlproperty real Qt3D.Render::RayCaster::length

    Holds the length of the 3d ray.
*/


QRayCaster::QRayCaster(Qt3DCore::QNode *parent)
    : QAbstractRayCaster(parent)
{
    QAbstractRayCasterPrivate::get(this)->m_rayCasterType = QAbstractRayCasterPrivate::WorldSpaceRayCaster;
}

QRayCaster::QRayCaster(QAbstractRayCasterPrivate &dd, Qt3DCore::QNode *parent)
    : QAbstractRayCaster(dd, parent)
{
    QAbstractRayCasterPrivate::get(this)->m_rayCasterType = QAbstractRayCasterPrivate::WorldSpaceRayCaster;
}

/*! \internal */
QRayCaster::~QRayCaster()
{
}

QVector3D QRayCaster::origin() const
{
    auto d = QAbstractRayCasterPrivate::get(this);
    return d->m_origin;
}

void QRayCaster::setOrigin(const QVector3D &origin)
{
    auto d = QAbstractRayCasterPrivate::get(this);
    if (d->m_origin != origin) {
        d->m_origin = origin;
        emit originChanged(d->m_origin);
    }
}

QVector3D QRayCaster::direction() const
{
    auto d = QAbstractRayCasterPrivate::get(this);
    return d->m_direction;
}

void QRayCaster::setDirection(const QVector3D &direction)
{
    auto d = QAbstractRayCasterPrivate::get(this);
    if (d->m_direction != direction) {
        d->m_direction = direction;
        emit directionChanged(d->m_direction);
    }
}

float QRayCaster::length() const
{
    auto d = QAbstractRayCasterPrivate::get(this);
    return d->m_length;
}

/*!
 * \brief Sets the length of the ray to \a length.
 *
 * If the value is less than or equal to zero, the ray is concidered to be infinite.
 */
void QRayCaster::setLength(float length)
{
    auto d = QAbstractRayCasterPrivate::get(this);
    if (!qFuzzyCompare(d->m_length, length)) {
        d->m_length = length;
        emit lengthChanged(d->m_length);
    }
}

/*!
 * Convenience method to enable the component and trigger tests using the current ray.
 */
void QRayCaster::trigger()
{
    setEnabled(true);
}

/*!
 * Convenience method to set the ray details \a origin, \a direction, and \a length,
 * and enable the component to trigger tests.
 */
void QRayCaster::trigger(const QVector3D &origin, const QVector3D &direction, float length)
{
    setOrigin(origin);
    setDirection(direction);
    setLength(length);
    setEnabled(true);
}

QAbstractRayCaster::Hits QRayCaster::pick(const QVector3D &origin, const QVector3D &direction, float length)
{
    setOrigin(origin);
    setDirection(direction);
    setLength(length);

    auto d = QAbstractRayCasterPrivate::get(this);
    return d->pick();
}

} // Qt3DRender

QT_END_NAMESPACE
