-- File:	ChFi2d.cdl
-- Created:	Mon Jun 12 13:33:39 1995
-- Author:	Philippe DERVIEUX
--		<phd@tlefon>
---Copyright:	 Matra Datavision 1995
-- Modified:	Tue Oct 15 10:12:02 1996
-- Author:	Joelle CHAUVET
--		<jct@sgi38>
--              Add ChFi2d_TangencyError (PRO3529)
-- Modified:	Tue Oct 22 09:23:11 1996
-- Author:	Joelle CHAUVET
--		<jct@sgi38>
--		Add ChFi2d_FirstEdgeDegenerated, ChFi2d_LastEdgeDegenerated,
--		ChFi2d_BothEdgesDegenerated (PRO4896)
-- Modified:	Fri Sep 25 09:38:04 1998
-- Author:	Joelle CHAUVET
--		<jct@sgi64>
--              ChFi2d_NotAuthorized is used if the edges are not
--              lines or circles (BUC60288)

package ChFi2d 

	---Purpose: This package contains the algorithms used to build
	--          fillets or chamfers on planar wire.

uses
    TopoDS,
    TopTools,
    gp

is
    
    enumeration ConstructionError is
	---Purpose: error     that    can   occur       during   the
	--          fillet  construction on planar wire
	NotPlanar,
	    ---Purpose: the face is not planar
	NoFace,
	    ---Purpose: the face is null
    	InitialisationError,
	    ---Purpose: the two  faces used for the initialisation are
	    --          uncompatible.
	ParametersError,
	    ---Purpose: the  parameters  as  distances   or  angle for
	    --          chamfer are less or equal to zero.
    	Ready,
	    ---Purpose: the initialization has been succesfull.
	IsDone,
	ComputationError,
	    ---Purpose: the algorithm could not find a solution.
	ConnexionError,
	    ---Purpose: the vertex given  to locate the fillet  or the
	    --          chamfer  is not connected to 2 edges.
	TangencyError,
	    ---Purpose: the two edges connected to the vertex are tangent.

 
	FirstEdgeDegenerated,
	    ---Purpose: the first edge is degenerated.
	LastEdgeDegenerated,
	    ---Purpose: the last edge is degenerated.
	BothEdgesDegenerated,
	    ---Purpose: the two edges are degenerated.
    	NotAuthorized
	    ---Purpose: One or the two  edges connected to the  vertex
	    --          is a fillet or a chamfer
	    --          One or the two  edges connected to the  vertex
	    --          is not a line or a circle
	
    end ConstructionError;


    class Builder;


    CommonVertex( E1, E2 :     Edge   from TopoDS; 
    	    	  V      : out Vertex from TopoDS)
    returns Boolean
    is private;
    	---Warning: <V> has sense only if the value <True> is returned    


    FindConnectedEdges( F      :     Face   from TopoDS;
    	    	        V      :     Vertex from TopoDS;
    	    	        E1, E2 : out Edge   from TopoDS)
    returns ConstructionError from ChFi2d
    is private;

    	---Warning: <E1> and <E2> has sense only if the returned value
    	--          is <IsDone>


end ChFi2d;