21 -- entities can be faces or edges.
38 ---Purpose: Constructs an object to display parallel constraints.
40 -- the second shape aSShape and the plane aPlane.
49 ---Purpose: Constructs an object to display parallel constraints.
53 -- its size anArrowSize.
57 ---Purpose: Returns true if the parallelism is movable.
80 -- given by <aProjector>.
85 -- to the object to display before computation !!!