AcGeLinearEnt2d::isColinearTo

GE_DLLEXPIMPORT Adesk::Boolean isColinearTo(
    const AcGeLinearEnt2d& line, 
    const AcGeTol& tol = AcGeContext::gTol
) const;

Determines if two lines are colinear.

Parameters	Description
line	Input any 2D linear entity
tol	Input tolerance