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Diffstat (limited to 'examples/widgets/graphicsview/boxes/trackball.cpp')
| -rw-r--r-- | examples/widgets/graphicsview/boxes/trackball.cpp | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/examples/widgets/graphicsview/boxes/trackball.cpp b/examples/widgets/graphicsview/boxes/trackball.cpp deleted file mode 100644 index b9dfc1fc7f..0000000000 --- a/examples/widgets/graphicsview/boxes/trackball.cpp +++ /dev/null @@ -1,159 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the demonstration applications of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** 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. -** -** BSD License Usage -** Alternatively, you may use this file under the terms of the BSD license -** as follows: -** -** "Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions are -** met: -** * Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** * Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** * Neither the name of The Qt Company Ltd nor the names of its -** contributors may be used to endorse or promote products derived -** from this software without specific prior written permission. -** -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "trackball.h" -#include "scene.h" - -//============================================================================// -// TrackBall // -//============================================================================// - -TrackBall::TrackBall(TrackMode mode) - : TrackBall(0, QVector3D(0, 1, 0), mode) -{ -} - -TrackBall::TrackBall(float angularVelocity, const QVector3D& axis, TrackMode mode) - : m_axis(axis) - , m_angularVelocity(angularVelocity) - , m_mode(mode) -{} - -void TrackBall::push(const QPointF& p, const QQuaternion &) -{ - m_rotation = rotation(); - m_pressed = true; - m_lastTime = QTime::currentTime(); - m_lastPos = p; - m_angularVelocity = 0.0f; -} - -void TrackBall::move(const QPointF& p, const QQuaternion &transformation) -{ - if (!m_pressed) - return; - - QTime currentTime = QTime::currentTime(); - int msecs = m_lastTime.msecsTo(currentTime); - if (msecs <= 20) - return; - - switch (m_mode) { - case Plane: - { - QLineF delta(m_lastPos, p); - const float angleDelta = qRadiansToDegrees(float(delta.length())); - m_angularVelocity = angleDelta / msecs; - m_axis = QVector3D(-delta.dy(), delta.dx(), 0.0f).normalized(); - m_axis = transformation.rotatedVector(m_axis); - m_rotation = QQuaternion::fromAxisAndAngle(m_axis, angleDelta) * m_rotation; - } - break; - case Sphere: - { - QVector3D lastPos3D = QVector3D(m_lastPos.x(), m_lastPos.y(), 0.0f); - float sqrZ = 1 - QVector3D::dotProduct(lastPos3D, lastPos3D); - if (sqrZ > 0) - lastPos3D.setZ(std::sqrt(sqrZ)); - else - lastPos3D.normalize(); - - QVector3D currentPos3D = QVector3D(p.x(), p.y(), 0.0f); - sqrZ = 1 - QVector3D::dotProduct(currentPos3D, currentPos3D); - if (sqrZ > 0) - currentPos3D.setZ(std::sqrt(sqrZ)); - else - currentPos3D.normalize(); - - m_axis = QVector3D::crossProduct(lastPos3D, currentPos3D); - float angle = qRadiansToDegrees(std::asin(m_axis.length())); - - m_angularVelocity = angle / msecs; - m_axis.normalize(); - m_axis = transformation.rotatedVector(m_axis); - m_rotation = QQuaternion::fromAxisAndAngle(m_axis, angle) * m_rotation; - } - break; - } - - - m_lastPos = p; - m_lastTime = currentTime; -} - -void TrackBall::release(const QPointF& p, const QQuaternion &transformation) -{ - // Calling move() caused the rotation to stop if the framerate was too low. - move(p, transformation); - m_pressed = false; -} - -void TrackBall::start() -{ - m_lastTime = QTime::currentTime(); - m_paused = false; -} - -void TrackBall::stop() -{ - m_rotation = rotation(); - m_paused = true; -} - -QQuaternion TrackBall::rotation() const -{ - if (m_paused || m_pressed) - return m_rotation; - - QTime currentTime = QTime::currentTime(); - float angle = m_angularVelocity * m_lastTime.msecsTo(currentTime); - return QQuaternion::fromAxisAndAngle(m_axis, angle) * m_rotation; -} - |