diff options
| -rw-r--r-- | src/gui/math3d/qmatrix4x4.cpp | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/src/gui/math3d/qmatrix4x4.cpp b/src/gui/math3d/qmatrix4x4.cpp index dc17eda50a..8fc439be6c 100644 --- a/src/gui/math3d/qmatrix4x4.cpp +++ b/src/gui/math3d/qmatrix4x4.cpp @@ -1010,11 +1010,24 @@ QMatrix4x4& QMatrix4x4::rotate(qreal angle, const QVector3D& vector) */ QMatrix4x4& QMatrix4x4::rotate(qreal angle, qreal x, qreal y, qreal z) { + if (angle == 0.0f) + return *this; QMatrix4x4 m(1); // The "1" says to not load the identity. - qreal a = angle * M_PI / 180.0f; - qreal c = qCos(a); - qreal s = qSin(a); - qreal ic; + qreal c, s, ic; + if (angle == 90.0f || angle == -270.0f) { + s = 1.0f; + c = 0.0f; + } else if (angle == -90.0f || angle == 270.0f) { + s = -1.0f; + c = 0.0f; + } else if (angle == 180.0f || angle == -180.0f) { + s = 0.0f; + c = -1.0f; + } else { + qreal a = angle * M_PI / 180.0f; + c = qCos(a); + s = qSin(a); + } bool quick = false; if (x == 0.0f) { if (y == 0.0f) { |