demos/boxes/trackball.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 22 Jan 2010 10:32:13 +0200
changeset 1 ae9c8dab0e3e
parent 0 1918ee327afb
child 3 41300fa6a67c
permissions -rw-r--r--
Revision: 201001 Kit: 201003
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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "trackball.h"
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#include "scene.h"
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//============================================================================//
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//                                  TrackBall                                 //
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//============================================================================//
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TrackBall::TrackBall(TrackMode mode)
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    : m_angularVelocity(0)
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    , m_paused(false)
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    , m_pressed(false)
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    , m_mode(mode)
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{
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    m_axis = QVector3D(0, 1, 0);
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    m_rotation = QQuaternion();
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    m_lastTime = QTime::currentTime();
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}
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TrackBall::TrackBall(float angularVelocity, const QVector3D& axis, TrackMode mode)
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    : m_axis(axis)
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    , m_angularVelocity(angularVelocity)
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    , m_paused(false)
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    , m_pressed(false)
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    , m_mode(mode)
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{
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    m_rotation = QQuaternion();
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    m_lastTime = QTime::currentTime();
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}
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void TrackBall::push(const QPointF& p, const QQuaternion &)
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{
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    m_rotation = rotation();
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    m_pressed = true;
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    m_lastTime = QTime::currentTime();
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    m_lastPos = p;
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    m_angularVelocity = 0.0f;
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}
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void TrackBall::move(const QPointF& p, const QQuaternion &transformation)
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{
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    if (!m_pressed)
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        return;
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    QTime currentTime = QTime::currentTime();
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    int msecs = m_lastTime.msecsTo(currentTime);
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    if (msecs <= 20)
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        return;
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    switch (m_mode) {
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    case Plane:
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        {
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            QLineF delta(m_lastPos, p);
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            m_angularVelocity = 180*delta.length() / (PI*msecs);
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            m_axis = QVector3D(-delta.dy(), delta.dx(), 0.0f).normalized();
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            m_axis = transformation.rotateVector(m_axis);
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            m_rotation = QQuaternion::fromAxisAndAngle(m_axis, 180 / PI * delta.length()) * m_rotation;
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        }
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        break;
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    case Sphere:
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        {
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            QVector3D lastPos3D = QVector3D(m_lastPos.x(), m_lastPos.y(), 0.0f);
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            float sqrZ = 1 - QVector3D::dotProduct(lastPos3D, lastPos3D);
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            if (sqrZ > 0)
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                lastPos3D.setZ(sqrt(sqrZ));
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            else
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                lastPos3D.normalize();
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            QVector3D currentPos3D = QVector3D(p.x(), p.y(), 0.0f);
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            sqrZ = 1 - QVector3D::dotProduct(currentPos3D, currentPos3D);
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            if (sqrZ > 0)
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                currentPos3D.setZ(sqrt(sqrZ));
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            else
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                currentPos3D.normalize();
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            m_axis = QVector3D::crossProduct(lastPos3D, currentPos3D);
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            float angle = 180 / PI * asin(sqrt(QVector3D::dotProduct(m_axis, m_axis)));
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            m_angularVelocity = angle / msecs;
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            m_axis.normalize();
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            m_axis = transformation.rotateVector(m_axis);
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            m_rotation = QQuaternion::fromAxisAndAngle(m_axis, angle) * m_rotation;
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        }
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        break;
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    }
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    m_lastPos = p;
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    m_lastTime = currentTime;
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}
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void TrackBall::release(const QPointF& p, const QQuaternion &transformation)
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{
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    // Calling move() caused the rotation to stop if the framerate was too low.
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    move(p, transformation);
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    m_pressed = false;
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}
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void TrackBall::start()
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{
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    m_lastTime = QTime::currentTime();
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    m_paused = false;
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}
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void TrackBall::stop()
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{
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    m_rotation = rotation();
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    m_paused = true;
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}
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QQuaternion TrackBall::rotation() const
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{
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    if (m_paused || m_pressed)
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        return m_rotation;
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    QTime currentTime = QTime::currentTime();
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    float angle = m_angularVelocity * m_lastTime.msecsTo(currentTime);
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    return QQuaternion::fromAxisAndAngle(m_axis, angle) * m_rotation;
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}
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