-- File:	GeomProjLib.cdl
-- Created:	Wed Aug 25 18:35:56 1993
-- Author:	Bruno DUMORTIER
--		<dub@topsn3>
---Copyright:	 Matra Datavision 1993


package GeomProjLib

---Purpose: Projection of a curve on a surface.

uses 
    gp,
    Geom,
    Geom2d
    
is

     --
     -- package methods
     -- 

     
     Curve2d(C           :        Curve   from Geom;
     	     First, Last :        Real    from Standard;
     	     S           :        Surface from Geom;
	     UFirst,ULast,
	     VFirst,VLast:        Real    from Standard ;
    	     Tolerance   : in out Real    from Standard )
    	---Purpose: gives  the 2d-curve   of  a 3d-curve  lying on   a
    	--          surface (  uses GeomProjLib_ProjectedCurve   ) 
    	--          The 3dCurve is taken between the parametrization 
    	--          range [First, Last]
    	--          <Tolerance> is used as input if the projection needs
    	--          an approximation. In this case, the reached 
    	--          tolerance is set in <Tolerance> as output.
     	--          WARNING :  if   the projection has  failed,   this
    	--          method returns a null Handle.
     returns Curve from Geom2d;
     
     Curve2d(C           :        Curve   from Geom;
     	     First, Last :        Real    from Standard;
     	     S           :        Surface from Geom;
    	     Tolerance   : in out Real    from Standard )
    	---Purpose: gives  the 2d-curve   of  a 3d-curve  lying on   a
    	--          surface (  uses GeomProjLib_ProjectedCurve   ) 
    	--          The 3dCurve is taken between the parametrization 
    	--          range [First, Last]
    	--          <Tolerance> is used as input if the projection needs
    	--          an approximation. In this case, the reached 
    	--          tolerance is set in <Tolerance> as output.
     	--          WARNING :  if   the projection has  failed,   this
    	--          method returns a null Handle.
     returns Curve from Geom2d;

     Curve2d(C           :        Curve   from Geom;
     	     First, Last :        Real    from Standard;
     	     S           :        Surface from Geom)
    	---Purpose: gives  the 2d-curve   of  a 3d-curve  lying on   a
    	--          surface (  uses GeomProjLib_ProjectedCurve   ) 
    	--          The 3dCurve is taken between the parametrization 
    	--          range [First, Last]
    	--          If the projection needs an approximation,
    	--          Precision::PApproximation() is used.
     	--          WARNING :  if   the projection has  failed,   this
    	--          method returns a null Handle.
     returns Curve from Geom2d;

     Curve2d(C : Curve   from Geom;
     	     S : Surface from Geom )
    	---Purpose: gives  the  2d-curve  of  a  3d-curve lying   on a
    	--          surface   ( uses   GeomProjLib_ProjectedCurve ).
    	--          If the projection needs an approximation,
    	--          Precision::PApproximation() is used.
    	--          WARNING  :  if the   projection has  failed,  this
    	--          method returns a null Handle.
     returns Curve from Geom2d;
     
         Curve2d(C : Curve   from Geom;
    		 S : Surface from Geom ;
                 UDeb : Real from Standard ;
		 UFin : Real from Standard ;
		 VDeb : Real from Standard ;
		 VFin : Real from Standard) 
     
    	---Purpose: gives  the  2d-curve  of  a  3d-curve lying   on a
    	--          surface   ( uses   GeomProjLib_ProjectedCurve ).
    	--          If the projection needs an approximation,
    	--          Precision::PApproximation() is used.
    	--          WARNING  :  if the   projection has  failed,  this
    	--          method returns a null Handle.
    	--          can expand a little the bounds of surface
     returns Curve from Geom2d;
     
     Curve2d(C           :        Curve   from Geom;
     	     S           :        Surface from Geom;
	     UDeb : Real from Standard ;
	     UFin : Real from Standard ;
	     VDeb : Real from Standard ;
	     VFin : Real from Standard ; 
    	     Tolerance   : in out Real    from Standard )
	     
        ---Purpose: gives  the  2d-curve  of  a  3d-curve lying   on a
    	--          surface   ( uses   GeomProjLib_ProjectedCurve ).
    	--          If the projection needs an approximation,
    	--          Precision::PApproximation() is used.
    	--          WARNING  :  if the   projection has  failed,  this
    	--          method returns a null Handle.
    	--          can expand a little the bounds of surface
     returns Curve from Geom2d;
     
     
     Project(C : Curve   from Geom;
     	     S : Surface from Geom ) 
	---Purpose: Constructs   the  3d-curve  from the normal
	--          projection  of the  Curve <C> on  the surface <S>.
	--          WARNING : if the  projection has failes returns  a
	--          null Handle.
     returns Curve from Geom;

     
     ProjectOnPlane(Curve               : Curve   from Geom;
     	    	    Plane               : Plane   from Geom;
		    Dir                 : Dir     from gp  ;
    	    	    KeepParametrization : Boolean from Standard)
	---Purpose: Constructs  the 3d-curves from the projection
	--          of the  curve  <Curve> on the  plane <Plane> along
	--          the direction <Dir>.
	--          If <KeepParametrization> is true, the parametrization 
	--          of the Projected Curve <PC> will be  the same as  the
	--          parametrization of the initial curve <C>.
	--          It meens: proj(C(u)) = PC(u) for each u.
	--          Otherwize, the parametrization may change.
     returns Curve from Geom;

end GeomProjLib;