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

class ShellFaceClassifier from TopOpeBRepBuild
    inherits CompositeClassifier from TopOpeBRepBuild

---Purpose: 
-- Classify faces and shells.
-- shapes are Shells, Elements are Faces.

uses
    
    ShapeEnum from TopAbs,
    State from TopAbs,
    Shape from TopoDS,
    Shell from TopoDS,
    Pnt from gp,
    DataMapOfShapeShape from TopTools,
    Builder from BRep,
    SolidClassifier from TopOpeBRepTool,
    BlockBuilder from TopOpeBRepBuild,
    Loop from TopOpeBRepBuild
    
is

    Create(BB : BlockBuilder) returns ShellFaceClassifier;
    ---Purpose: Creates a classifier in 3D space, to compare : 
    -- a face with a set of faces
    -- a shell with a set of faces
    -- a shell with a shell

    Clear(me : in out) is static;
    
    CompareShapes(me : in out; B1,B2 : Shape from TopoDS)
    ---Purpose: classify shell <B1> with shell <B2>
    returns State from TopAbs;
    
    CompareElementToShape(me : in out; F : Shape; S : Shape)
    ---Purpose: classify face <F> with shell <S>
    returns State from TopAbs;
    
    ResetShape(me : in out; S : Shape);
    ---Purpose: prepare classification involving shell <S>
    -- calls ResetElement on first face of <S>
    
    ResetElement(me : in out; F : Shape);
    ---Purpose: prepare classification involving face <F>
    -- define 3D point (later used in Compare()) on first vertex of face <F>.
    
    CompareElement(me : in out; F : Shape);
    ---Purpose: Add the face <F> in the set of faces used in 3D point
    -- classification.
    
    State(me : in out) returns State from TopAbs;
    ---Purpose: Returns state of classification of 3D point, defined by 
    -- ResetElement, with the current set of faces, defined by Compare.

fields
    
    myFirstCompare : Boolean from Standard;
    myPoint3d : Pnt from gp;
    myShell : Shell from TopoDS;
    myBuilder : Builder from BRep;
    mySolidClassifier : SolidClassifier from TopOpeBRepTool;
    myFaceShellMap : DataMapOfShapeShape from TopTools; 
    myShape : Shape from TopoDS;
   
end ShellFaceClassifier from TopOpeBRepBuild;