virtual bool   sgC2DObject::IsPlane(SG_VECTOR*,double*) const



This function is pure virtual. It checks whether the object is flat or not. It is useful for splines and contours. If the object lies in the same plane the arguments (if not NULL) has the values of the normal to the plane and the free coefficient in the equation of plane.



No arguments.


Returned value:

true if the object is flat, fasle otherwise