Renamed Camera to QCamera

Change-Id: I8a37bd9d2f24d77c4f4a3aec41028df0b292d7c6
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 246 insertions, 0 deletions

diff --git a/src/core/core-components/qcamera.cpp b/src/core/core-components/qcamera.cpp
new file mode 100644
index 000000000..aa154c248
--- /dev/null
+++ b/src/core/core-components/qcamera.cpp
@@ -0,0 +1,246 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qcamera.h"
+#include "qcamera_p.h"
+#include "qcameralens.h"
+#include <qtransform.h>
+#include <qlookattransform.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3D {
+
+QCamera::QCamera(QNode *parent) : QEntity(parent)
+  , d_ptr(new QCameraPrivate(this))
+{
+    qDebug() << Q_FUNC_INFO;
+}
+
+QCameraLens *QCamera::lens() const
+{
+    Q_D(const QCamera);
+    return d->m_lens;
+}
+
+void QCamera::setLens(QCameraLens *lens)
+{
+    Q_D(QCamera);
+    if (d->m_lens != lens) {
+        if (d->m_lens)
+            removeComponent(d->m_lens);
+        d->m_lens = lens;
+        if (d->m_lens)
+            addComponent(d->m_lens);
+        emit lensChanged();
+    }
+}
+
+QTransform *QCamera::transform() const
+{
+    Q_D(const QCamera);
+    return d->m_transform;
+}
+
+void QCamera::setTransform(QTransform *transform)
+{
+    Q_D(QCamera);
+    if (d->m_transform != transform) {
+        if (d->m_transform)
+            removeComponent(d->m_transform);
+        d->m_transform = transform;
+        if (d->m_transform)
+            addComponent(d->m_transform);
+        emit transformChanged();
+    }
+}
+
+void QCamera::translate( const QVector3D& vLocal, CameraTranslationOption option )
+{
+    Q_D(QCamera);
+    QLookAtTransform *lookAt = d->m_transform->findFirstTransform<QLookAtTransform>();
+    if (lookAt == Q_NULLPTR)
+        return;
+
+    // Calculate the amount to move by in world coordinates
+    QVector3D vWorld;
+    if ( !qFuzzyIsNull( vLocal.x() ) )
+    {
+        // Calculate the vector for the local x axis
+        QVector3D x = QVector3D::crossProduct(lookAt->viewVector(), lookAt->upVector()).normalized();
+        vWorld += vLocal.x() * x;
+    }
+
+    if ( !qFuzzyIsNull( vLocal.y() ) )
+        vWorld += vLocal.y() * lookAt->upVector();
+
+    if ( !qFuzzyIsNull( vLocal.z() ) )
+        vWorld += vLocal.z() * lookAt->viewVector().normalized();
+
+    // Update the camera position using the calculated world vector
+    lookAt->setPosition(lookAt->position() + vWorld);
+
+    // May be also update the view center coordinates
+    if ( option == TranslateViewCenter )
+        lookAt->setViewCenter(lookAt->viewCenter() + vWorld);
+
+    // Refresh the camera -> view center vector
+    lookAt->setViewVector(lookAt->viewCenter() - lookAt->position());
+
+    // Calculate a new up vector. We do this by:
+    // 1) Calculate a new local x-direction vector from the cross product of the new
+    //    camera to view center vector and the old up vector.
+    // 2) The local x vector is the normal to the plane in which the new up vector
+    //    must lay. So we can take the cross product of this normal and the new
+    //    x vector. The new normal vector forms the last part of the orthonormal basis
+    QVector3D x = QVector3D::crossProduct( lookAt->viewVector(), lookAt->upVector() ).normalized();
+    lookAt->setUpVector(QVector3D::crossProduct( x, lookAt->viewVector() ).normalized());
+}
+
+void QCamera::translateWorld(const QVector3D& vWorld , CameraTranslationOption option )
+{
+    Q_D(QCamera);
+    QLookAtTransform *lookAt = d->m_transform->findFirstTransform<QLookAtTransform>();
+    if (lookAt == Q_NULLPTR)
+        return ;
+
+    // Update the camera position using the calculated world vector
+    lookAt->setPosition(lookAt->position() + vWorld);
+
+    // May be also update the view center coordinates
+    if ( option == TranslateViewCenter )
+        lookAt->setViewCenter(lookAt->viewCenter() + vWorld);
+
+    // Refresh the camera -> view center vector
+    lookAt->setViewVector(lookAt->viewCenter() - lookAt->position());
+}
+
+QQuaternion QCamera::tiltRotation(float angle) const
+{
+    Q_D(const QCamera);
+    QLookAtTransform *lookAt = d->m_transform->findFirstTransform<QLookAtTransform>();
+    if (lookAt == Q_NULLPTR)
+        return QQuaternion();
+    QVector3D xBasis = QVector3D::crossProduct( lookAt->upVector(),
+                                                lookAt->viewVector().normalized() ).normalized();
+    return QQuaternion::fromAxisAndAngle( xBasis, -angle );
+}
+
+QQuaternion QCamera::panRotation(float angle) const
+{
+    Q_D(const QCamera);
+    QLookAtTransform *lookAt = d->m_transform->findFirstTransform<QLookAtTransform>();
+    if (lookAt == Q_NULLPTR)
+        return QQuaternion();
+    return QQuaternion::fromAxisAndAngle( lookAt->upVector(), angle );
+}
+
+QQuaternion QCamera::rollRotation(float angle) const
+{
+    Q_D(const QCamera);
+    QLookAtTransform *lookAt = d->m_transform->findFirstTransform<QLookAtTransform>();
+    if (lookAt == Q_NULLPTR)
+        return QQuaternion();
+    return QQuaternion::fromAxisAndAngle( lookAt->viewVector(), -angle );
+}
+
+void QCamera::tilt( const float& angle )
+{
+    QQuaternion q = tiltRotation( angle );
+    rotate( q );
+}
+
+void QCamera::pan( const float& angle )
+{
+    QQuaternion q = panRotation( -angle );
+    rotate( q );
+}
+
+void QCamera::roll( const float& angle )
+{
+    QQuaternion q = rollRotation( -angle );
+    rotate( q );
+}
+
+void QCamera::tiltAboutViewCenter( const float& angle )
+{
+    QQuaternion q = tiltRotation( -angle );
+    rotateAboutViewCenter( q );
+}
+
+void QCamera::panAboutViewCenter( const float& angle )
+{
+    QQuaternion q = panRotation( angle );
+    rotateAboutViewCenter( q );
+}
+
+void QCamera::rollAboutViewCenter( const float& angle )
+{
+    QQuaternion q = rollRotation( angle );
+    rotateAboutViewCenter( q );
+}
+
+void QCamera::rotate( const QQuaternion& q )
+{
+    Q_D(QCamera);
+    QLookAtTransform *lookAt = d->m_transform->findFirstTransform<QLookAtTransform>();
+    if (lookAt == Q_NULLPTR)
+        return ;
+    lookAt->setUpVector(q.rotatedVector(lookAt->upVector()));
+    QVector3D cameraToCenter = q.rotatedVector(lookAt->viewVector());
+    lookAt->setViewCenter(lookAt->position() + cameraToCenter);
+}
+
+void QCamera::rotateAboutViewCenter( const QQuaternion& q )
+{
+    Q_D(QCamera);
+    QLookAtTransform *lookAt = d->m_transform->findFirstTransform<QLookAtTransform>();
+    if (lookAt == Q_NULLPTR)
+        return ;
+    lookAt->setUpVector(q.rotatedVector(lookAt->upVector()));
+    QVector3D cameraToCenter = q.rotatedVector(lookAt->viewVector());
+    lookAt->setViewVector(cameraToCenter);
+    lookAt->setPosition(lookAt->viewCenter() - cameraToCenter);
+}
+
+} // Qt3D
+
+QT_END_NAMESPACE