-- File:	AIS_ParallelRelation.cdl
-- Created:	Thu Dec  5 10:34:57 1996
-- Author:	Jean-Pierre COMBE/Odile Olivier
--		<odl@sacadox.paris1.matra-dtv.fr>
---Copyright:	 Matra Datavision 1996


class ParallelRelation from AIS inherits Relation from AIS

	---Purpose: A framework to display constraints of parallelism
    	-- between two or more Interactive Objects. These
    	-- entities can be faces or edges.

uses Shape                 from TopoDS,
     Presentation          from Prs3d,
     PresentationManager3d from PrsMgr,
     Selection             from SelectMgr,
     Plane                 from Geom,
     Dir                   from gp,
     Pnt                   from gp,
     Projector             from Prs3d,
    Transformation        from Geom,
     PresentationManager2d from PrsMgr,
     GraphicObject         from Graphic2d,    
     ArrowSide             from DsgPrs 

is
    Create (aFShape     : Shape          from TopoDS;
    	    aSShape     : Shape          from TopoDS;
	    aPlane      : Plane          from Geom)
	---Purpose:  Constructs an object to display parallel constraints.
    	-- This object is defined by the first shape aFShape and
    	-- the second shape aSShape and the plane aPlane.
    returns mutable ParallelRelation from AIS;

    Create (aFShape     : Shape          from TopoDS;
    	    aSShape     : Shape          from TopoDS;
	    aPlane      : Plane          from Geom;
	    aPosition   : Pnt            from gp;
	    aSymbolPrs  : ArrowSide      from DsgPrs;    
    	    anArrowSize : Real           from Standard = 0.01)
	---Purpose: Constructs an object to display parallel constraints.
    	-- This object is defined by the first shape aFShape and
    	-- the second shape aSShape the plane aPlane, the
    	-- position aPosition, the type of arrow, aSymbolPrs and
    	-- its size anArrowSize.
    returns mutable ParallelRelation from AIS;

    IsMovable(me) returns Boolean from Standard 
    	---Purpose: Returns true if the parallelism is movable.  
    	---C++: inline    
    is redefined;
    
-- Methods from PresentableObject

    Compute(me            : mutable;
  	    aPresentationManager: PresentationManager3d from PrsMgr;
    	    aPresentation : mutable Presentation from Prs3d;
    	    aMode         : Integer from Standard= 0) 
    is redefined static private;
    
    Compute(me:mutable;
    	        aProjector: Projector from Prs3d;
                aPresentation: mutable Presentation from Prs3d)
    is redefined static private;     

    Compute(me:mutable;
    	    aPresentationManager: PresentationManager2d from PrsMgr;
            aPresentation: mutable GraphicObject from Graphic2d;
            aMode: Integer from Standard = 0)
    is redefined static private;	    
    

    Compute(me            : mutable;
    	    aProjector    : Projector from Prs3d;
    	    aTrsf         : Transformation from Geom;
	    aPresentation : mutable Presentation from Prs3d)
    is redefined;
    	---Purpose: computes the presentation according to a point of view
    	--          given by <aProjector>. 
    	--          To be Used when the associated degenerated Presentations 
    	--          have been transformed by <aTrsf> which is not a Pure
    	--          Translation. The HLR Prs can't be deducted automatically
    	--          WARNING :<aTrsf> must be applied
    	--           to the object to display before computation  !!!

-- Methods from SelectableObject

    ComputeSelection(me         : mutable;
    	    	     aSelection : mutable Selection from SelectMgr;
    	    	     aMode      : Integer from Standard)is private;



--
--     Computation private methods
--

    ComputeTwoFacesParallel(me: mutable;
    	    	    	    aPresentation : mutable Presentation from Prs3d)
    is private;
    
    ComputeTwoEdgesParallel(me: mutable;
    	    	    	    aPresentation : mutable Presentation from Prs3d)
    is private;
    

fields

    myFAttach   : Pnt   from gp;
    mySAttach   : Pnt   from gp;
    myDirAttach : Dir   from gp;
    
end ParallelRelation;