double determ = determinant ();
if (fabs(determ) < 1E-6) {
sys_error (ERR_WARNING, "Determinant = %g [TransformationMatrix2D::invert]", determ);\r
double determ = determinant ();
if (fabs(determ) < 1E-6) {
sys_error (ERR_WARNING, "Determinant = %g [TransformationMatrix2D::invert]", determ);\r