-- File:	ShapeFix_FreeBounds.cdl
-- Created:	Wed Sep 16 12:44:57 1998
-- Author:	Roman LYGIN <rln@nnov.matra-dtv.fr>
--		Pavel DURANDIN <pdn@nnov.matra-dtv.fr>
---Copyright:	 Matra Datavision 1998


class FreeBounds from ShapeFix

    ---Purpose: This class is intended to output free bounds of the shape
    --          (free bounds are the wires consisting of edges referenced by the
    --          only face).
    --          For building free bounds it uses ShapeAnalysis_FreeBounds class.
    --          This class complements it with the feature to reduce the number
    --          of open wires.
    --          This reduction is performed with help of connecting several
    --          adjacent open wires one to another what can lead to:
    --          1. making an open wire with greater length out of several
    --             open wires
    --          2. making closed wire out of several open wires
    --
    --          The connecting open wires is performed with a user-given
    --          tolerance.
    --
    --          When connecting several open wires into one wire their previous
    --          end vertices are replaced with new connecting vertices. After
    --          that all the edges in the shape sharing previous vertices inside
    --          the shape are updated with new vertices. Thus source shape can
    --          be modified.
    --
    --          Since interface of this class is the same as one of
    --          ShapeAnalysis_FreeBounds refer to its CDL for details.


uses
    Shape    from TopoDS,
    Compound from TopoDS

is

    Create returns  FreeBounds from  ShapeFix;
    	---Purpose: Empty constructor

    Create (shape      : Shape   from TopoDS; 
    	    sewtoler   : Real;
	    closetoler : Real;
    	    splitclosed: Boolean;
    	    splitopen  : Boolean)
    returns FreeBounds from ShapeFix;
    	---Purpose: Builds forecasting free bounds of the <shape> and connects
        --          open wires with tolerance <closetoler>.
    	--          <shape> should be a compound of faces.
        --          Tolerance <closetoler> should be greater than tolerance
        --          <sewtoler> used for initializing sewing analyzer, otherwise
        --          connection of open wires is not performed.
    
    Create (shape      : Shape   from TopoDS;
    	    closetoler : Real;
    	    splitclosed: Boolean;
    	    splitopen  : Boolean)
    returns FreeBounds from ShapeFix;
    	---Purpose: Builds actual free bounds of the <shape> and connects
        --          open wires with tolerance <closetoler>.
    	--          <shape> should be a compound of shells.

    GetClosedWires (me) returns Compound from TopoDS; 
    	---Purpose: Returns compound of closed wires out of free edges.
	---C++: inline
	---C++: return const &
     
    GetOpenWires (me) returns Compound from TopoDS; 
    	---Purpose: Returns compound of open wires out of free edges.
	---C++: inline
	---C++: return const &
	
    GetShape (me) returns Shape from TopoDS;
    	---Purpose: Returns modified source shape.
	---C++: inline
	---C++: return const &
	
	
    ---Level: Internal
    Perform (me: in out) returns Boolean is private;
	
fields

    myWires: Compound from TopoDS; 
    myEdges: Compound from TopoDS; 
    myShape: Shape    from TopoDS;
    
    myShared     : Boolean;
    mySewToler   : Real;
    myCloseToler : Real;
    mySplitClosed: Boolean;
    mySplitOpen  : Boolean;

end FreeBounds;