diff options
Diffstat (limited to 'src/gui/painting/qmatrix.cpp')
| -rw-r--r-- | src/gui/painting/qmatrix.cpp | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/src/gui/painting/qmatrix.cpp b/src/gui/painting/qmatrix.cpp index 88b2b7a..17b7241 100644 --- a/src/gui/painting/qmatrix.cpp +++ b/src/gui/painting/qmatrix.cpp @@ -85,7 +85,7 @@ QT_BEGIN_NAMESPACE which returns true if the matrix is non-singular (i.e. AB = BA = I). The inverted() function returns an inverted copy of \e this matrix if it is invertible (otherwise it returns the identity - matrix). In addition, QMatrix provides the det() function + matrix). In addition, QMatrix provides the determinant() function returning the matrix's determinant. Finally, the QMatrix class supports matrix multiplication, and @@ -959,9 +959,19 @@ QMatrix &QMatrix::rotate(qreal a) */ /*! + \obsolete \fn qreal QMatrix::det() const Returns the matrix's determinant. + + \sa determinant() +*/ + +/*! + \since 4.6 + \fn qreal QMatrix::determinant() const + + Returns the matrix's determinant. */ /*! @@ -985,8 +995,8 @@ QMatrix &QMatrix::rotate(qreal a) QMatrix QMatrix::inverted(bool *invertible) const { - qreal determinant = det(); - if (determinant == 0.0) { + qreal dtr = determinant(); + if (dtr == 0.0) { if (invertible) *invertible = false; // singular matrix return QMatrix(true); @@ -994,7 +1004,7 @@ QMatrix QMatrix::inverted(bool *invertible) const else { // invertible matrix if (invertible) *invertible = true; - qreal dinv = 1.0/determinant; + qreal dinv = 1.0/dtr; return QMatrix((_m22*dinv), (-_m12*dinv), (-_m21*dinv), (_m11*dinv), ((_m21*_dy - _m22*_dx)*dinv), |