diff options
Diffstat (limited to 'demos/boxes/trackball.cpp')
| -rw-r--r-- | demos/boxes/trackball.cpp | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/demos/boxes/trackball.cpp b/demos/boxes/trackball.cpp index 9898441..60de6af 100644 --- a/demos/boxes/trackball.cpp +++ b/demos/boxes/trackball.cpp @@ -92,9 +92,9 @@ void TrackBall::move(const QPointF& p, const QQuaternion &transformation) { QLineF delta(m_lastPos, p); m_angularVelocity = 180*delta.length() / (PI*msecs); - m_axis = QVector3D(delta.dy(), -delta.dx(), 0.0f).normalized(); + m_axis = QVector3D(-delta.dy(), delta.dx(), 0.0f).normalized(); m_axis = transformation.rotateVector(m_axis); - m_rotation *= QQuaternion::fromAxisAndAngle(m_axis, delta.length()); + m_rotation = QQuaternion::fromAxisAndAngle(m_axis, 180 / PI * delta.length()) * m_rotation; } break; case Sphere: @@ -113,13 +113,13 @@ void TrackBall::move(const QPointF& p, const QQuaternion &transformation) else currentPos3D.normalize(); - m_axis = QVector3D::crossProduct(currentPos3D, lastPos3D); - float angle = asin(sqrt(QVector3D::dotProduct(m_axis, m_axis))); + m_axis = QVector3D::crossProduct(lastPos3D, currentPos3D); + float angle = 180 / PI * asin(sqrt(QVector3D::dotProduct(m_axis, m_axis))); - m_angularVelocity = 180*angle / (PI*msecs); + m_angularVelocity = angle / msecs; m_axis.normalize(); m_axis = transformation.rotateVector(m_axis); - m_rotation *= QQuaternion::fromAxisAndAngle(m_axis, angle); + m_rotation = QQuaternion::fromAxisAndAngle(m_axis, angle) * m_rotation; } break; } @@ -155,6 +155,6 @@ QQuaternion TrackBall::rotation() const QTime currentTime = QTime::currentTime(); float angle = m_angularVelocity * m_lastTime.msecsTo(currentTime); - return m_rotation * QQuaternion::fromAxisAndAngle(m_axis, angle); + return QQuaternion::fromAxisAndAngle(m_axis, angle) * m_rotation; } |