-- File:	TopOpeBRepBuild_WireEdgeClassifier.cdl
-- Created:	Thu Jun 17 10:15:32 1993
-- Author:	Jean Yves LEBEY
--		<jyl@zerox>
---Copyright:	 Matra Datavision 1993

class WireEdgeClassifier from TopOpeBRepBuild
    inherits CompositeClassifier from TopOpeBRepBuild
    
---Purpose: 
-- Classify edges and wires.
-- shapes are Wires, Element are Edge.

uses
    
    ShapeEnum from TopAbs,
    State from TopAbs,
    Shape from TopoDS,
    Pnt2d from gp,
    Edge from BRepClass,
    FacePassiveClassifier from BRepClass,
    BlockBuilder from TopOpeBRepBuild,
    Loop from TopOpeBRepBuild
    
is

    Create(F : Shape from TopoDS;
    	   BB : BlockBuilder) returns WireEdgeClassifier;
    ---Purpose: Creates a classifier on edge <F>.  
    -- Used to compare edges and wires on the edge <F>.

    Compare(me : in out; L1,L2 : Loop) returns State from TopAbs
    is redefined;

    LoopToShape(me : in out; L : Loop)
    returns Shape from TopoDS;

    CompareShapes(me : in out; B1,B2 : Shape from TopoDS)
    ---Purpose: classify wire <B1> with wire <B2>
    returns State from TopAbs;
    
    CompareElementToShape(me : in out; E,B : Shape from TopoDS)
    ---Purpose: classify edge <E> with wire <B>
    returns State from TopAbs;
    
    ResetShape(me : in out; B : Shape from TopoDS);
    ---Purpose: prepare classification involving wire <B>
    -- calls ResetElement on first edge of <B>
    
    ResetElement(me : in out; E : Shape from TopoDS);
    ---Purpose: prepare classification involving edge <E>
    -- define 2D point (later used in Compare()) on first vertex of edge <E>.
    
    CompareElement(me : in out; E : Shape from TopoDS);
    ---Purpose: Add the edge <E> in the set of edges used in 2D point
    -- classification.
    
    State(me : in out) returns State from TopAbs;
    ---Purpose: Returns state of classification of 2D point, defined by 
    -- ResetElement, with the current set of edges, defined by Compare.

fields
    
    myFirstCompare : Boolean;
    myPoint2d : Pnt2d from gp;
    myBCEdge : Edge from BRepClass;
    myFPC : FacePassiveClassifier from BRepClass; 
    myShape : Shape from TopoDS;
    
end WireEdgeClassifier from TopOpeBRepBuild;