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| author | Sarah Smith <sarah.j.smith@nokia.com> | 2011-02-16 04:58:28 (GMT) |
|---|---|---|
| committer | Sarah Smith <sarah.j.smith@nokia.com> | 2011-02-16 04:58:28 (GMT) |
| commit | b5076fb392894e71b44b4762d0567354ef1c8a9e (patch) | |
| tree | fb626b9b1df8814a88b7642d4eb8fd6dbada5ecc /src | |
| parent | 0b0358732cafc34d4b6794200752ac9cb99de569 (diff) | |
| download | Qt-b5076fb392894e71b44b4762d0567354ef1c8a9e.zip Qt-b5076fb392894e71b44b4762d0567354ef1c8a9e.tar.gz Qt-b5076fb392894e71b44b4762d0567354ef1c8a9e.tar.bz2 | |
Add a "note well" to QVectorXD re float precision.
Several bug-reports ask for clarifications/warnings in the doc for this
class, since it stores in float, but has a qreal interface (as per qt
convention).
Change-Id: I32ffcde3733866942134e881567eef367a5620f5
Task-number: QTBUG-8216
Reviewed-by: Rhys Weatherley
Diffstat (limited to 'src')
| -rw-r--r-- | src/gui/math3d/qvector2d.cpp | 5 | ||||
| -rw-r--r-- | src/gui/math3d/qvector3d.cpp | 5 | ||||
| -rw-r--r-- | src/gui/math3d/qvector4d.cpp | 5 |
3 files changed, 15 insertions, 0 deletions
diff --git a/src/gui/math3d/qvector2d.cpp b/src/gui/math3d/qvector2d.cpp index 7f5a937..1fccfc9 100644 --- a/src/gui/math3d/qvector2d.cpp +++ b/src/gui/math3d/qvector2d.cpp @@ -60,6 +60,11 @@ QT_BEGIN_NAMESPACE The QVector2D class can also be used to represent vertices in 2D space. We therefore do not need to provide a separate vertex class. + \bold{Note:} By design values in the QVector2D instance are stored as \c float. + This means that on platforms where the \c qreal arguments to QVector2D + functions are represented by \c double values, it is possible to + lose precision. + \sa QVector3D, QVector4D, QQuaternion */ diff --git a/src/gui/math3d/qvector3d.cpp b/src/gui/math3d/qvector3d.cpp index 2414b5f..7bf0400 100644 --- a/src/gui/math3d/qvector3d.cpp +++ b/src/gui/math3d/qvector3d.cpp @@ -63,6 +63,11 @@ QT_BEGIN_NAMESPACE The QVector3D class can also be used to represent vertices in 3D space. We therefore do not need to provide a separate vertex class. + \bold{Note:} By design values in the QVector3D instance are stored as \c float. + This means that on platforms where the \c qreal arguments to QVector3D + functions are represented by \c double values, it is possible to + lose precision. + \sa QVector2D, QVector4D, QQuaternion */ diff --git a/src/gui/math3d/qvector4d.cpp b/src/gui/math3d/qvector4d.cpp index 74dedc4..23befc0 100644 --- a/src/gui/math3d/qvector4d.cpp +++ b/src/gui/math3d/qvector4d.cpp @@ -59,6 +59,11 @@ QT_BEGIN_NAMESPACE The QVector4D class can also be used to represent vertices in 4D space. We therefore do not need to provide a separate vertex class. + \bold{Note:} By design values in the QVector4D instance are stored as \c float. + This means that on platforms where the \c qreal arguments to QVector4D + functions are represented by \c double values, it is possible to + lose precision. + \sa QQuaternion, QVector2D, QVector3D */ |