diff options
Diffstat (limited to 'examples/widgets/graphicsview/boxes/trackball.cpp')
| -rw-r--r-- | examples/widgets/graphicsview/boxes/trackball.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/examples/widgets/graphicsview/boxes/trackball.cpp b/examples/widgets/graphicsview/boxes/trackball.cpp index 15f3af77d1..794ce7ac37 100644 --- a/examples/widgets/graphicsview/boxes/trackball.cpp +++ b/examples/widgets/graphicsview/boxes/trackball.cpp @@ -50,6 +50,7 @@ #include "trackball.h" #include "scene.h" +#include <qmath.h> #include <cmath> //============================================================================// @@ -101,10 +102,11 @@ void TrackBall::move(const QPointF& p, const QQuaternion &transformation) case Plane: { QLineF delta(m_lastPos, p); - m_angularVelocity = 180*delta.length() / (PI*msecs); + 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, 180 / PI * delta.length()) * m_rotation; + m_rotation = QQuaternion::fromAxisAndAngle(m_axis, angleDelta) * m_rotation; } break; case Sphere: @@ -124,7 +126,7 @@ void TrackBall::move(const QPointF& p, const QQuaternion &transformation) currentPos3D.normalize(); m_axis = QVector3D::crossProduct(lastPos3D, currentPos3D); - float angle = 180 / PI * std::asin(std::sqrt(QVector3D::dotProduct(m_axis, m_axis))); + float angle = qRadiansToDegrees(std::asin(m_axis.length())); m_angularVelocity = angle / msecs; m_axis.normalize(); |