-- File:	ChFi3d.cdl
-- Created:	Tue Nov  9 15:39:27 1993
-- Author:	Laurent BOURESCHE
--		<lbo@zerox>
---Copyright:	 Matra Datavision 1993



package ChFi3d 

	---Purpose: creation of spatial fillets on a solid. 

uses ChFiDS,
     TopOpeBRepBuild,
     TopOpeBRepDS,
     BRepAdaptor,
     BRepTopAdaptor,     
     BRepBlend,
     BlendFunc,
     Blend,
     AppBlend,
     Law,
     gp,
     Geom2d,
     Geom,
     GeomAbs,
     TopoDS,
     TopAbs,
     TCollection,
     TColStd,
     TColgp,
     TopTools,
     MMgt,
     StdFail,
     math,
     AdvApprox,
     Adaptor3d,
     Adaptor2d,
     Standard

is
    deferred class Builder;
    ---Purpose: Structure and methods common for the construction 
    --          of fillets  and  chamfers 3d.

    class ChBuilder;
    ---Purpose: Tool constructing chamfers on a solid.

    class FilBuilder;
    ---Purpose: Outil de construction de conges sur un solide.
    
    private class SearchSing;
     ---Purpose: Searches   singularities on fillet

    enumeration FilletShape is
    	Rational,
	QuasiAngular,
	Polynomial
 --- Purpose:
-- Lists the types of fillet shapes. These include the following:
-- -   ChFi3d_Rational (default value), which is the
--   standard NURBS representation of circles,
-- -   ChFi3d_QuasiAngular, which is a NURBS
--   representation of circles where the parameters
--   match those of the circle,
-- -   ChFi3d_Polynomial, which corresponds to a
--   polynomial approximation of circles. This type
--   facilitates the implementation of the construction algorithm. 
        
    end FilletShape;
     

    ConcaveSide (S1,S2 : Surface from BRepAdaptor; E : Edge from TopoDS; 
                 Or1,Or2 : out Orientation from TopAbs)
    ---Purpose: Returns  Reversed  in  Or1  and(or)  Or2  if  
    --          the  concave edge  defined by the  interior of faces F1 and F2,  
    --          in  the  neighbourhood of  their boundary E is of the edge opposite to  the 
    --          normal  of their surface  support.  The  orientation of
    --          faces is  not  taken  into  consideration in  the calculation. The
    --          function  returns  0 if  the calculation fails (tangence),
    --          if  not, it  returns the  number of  choice of  the fillet
    --          or chamfer corresponding to  the orientations  calculated
    --          and  to  the tangent to  the  guide line read in  E.
    --          
    returns Integer from Standard;


    NextSide (Or1,Or2         : in out Orientation from TopAbs;
              OrSave1,OrSave2 :        Orientation from TopAbs;
              ChoixSauv       :        Integer     from Standard)
    ---Purpose: Same  as ConcaveSide, but the orientations are
    --          logically  deduced from  the result of  the call of
    --          ConcaveSide on  the  first pair of faces of  the fillet or
    --          chamnfer.
    returns Integer from Standard;

    NextSide (Or : in out Orientation from TopAbs;
              OrSave,OrFace : Orientation from TopAbs);
    ---Purpose: Same  as  the  other NextSide, but the calculation is  done
    --          on an edge  only.


    SameSide(Or,OrSave1,OrSave2,OrFace1,OrFace2 : Orientation from TopAbs)
    ---Purpose: Enables  to  determine while  processing  an  angle, if
    --          two fillets or chamfers constituting a face have 
    --          identic or opposed  concave  edges.
    returns Boolean from Standard;
    


end ChFi3d;