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

class WireEdgeClassifier from BOP inherits CompositeClassifier from BOP
    
    ---Purpose: 
    -- The  algorithm is to classify loops that
    -- shapes are Wires, Element are Edge.

uses 

    ShapeEnum from TopAbs,
    State     from TopAbs, 
    
    Shape     from TopoDS,
    Face      from TopoDS, 
    
    Pnt2d     from gp, 
    
    Edge                  from BRepClass,
    FacePassiveClassifier from BRepClass,
    BlockBuilder from BOP,
    Loop         from BOP
    
is

    Create(F : Face 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 : Loop from BOP; 
    	    L2 : Loop from BOP) 
    	returns State from TopAbs
    	is redefined;
    	---Purpose:  
    	--- Classify loop <L1> with  <L2>  
    	---
    LoopToShape(me : in out;  
    	L : Loop from BOP)
    	returns Shape from TopoDS;
    	---Purpose: 
    	--- Internal usage  
    	---
    CompareShapes(me : in out;  
    	    	  B1 : Shape from TopoDS;
    	    	  B2 : Shape from TopoDS) 
    	returns State from TopAbs;
    	---Purpose:  
    	--- Classify wire <B1> with wire <B2> 
    	---
    CompareElementToShape(me : in out;  
    	    	    	  E : Shape from TopoDS;
    	    	    	  W : Shape from TopoDS) 
    	returns State from TopAbs;
    	---Purpose:  
    	--- Classify edge <E> with wire <W> 
    	---
    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 from Standard;
    myPoint2d      : Pnt2d from gp;
    myBCEdge       : Edge  from BRepClass;
    myFPC          : FacePassiveClassifier from BRepClass; 
    myShape        : Shape from TopoDS;
    
end WireEdgeClassifier;