exploring/brep_topology/brep_topology.java

Refer to the B-Rep Topology Exploration Example.

// ****************************************************************************
// $Id$
//
// Copyright (C) 2008-2014, Roman Lygin. All rights reserved.
// Copyright (C) 2014-2025, CADEX. All rights reserved.
//
// This file is part of the Manufacturing Toolkit software.
//
// You may use this file under the terms of the BSD license as follows:
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// ****************************************************************************
 
import cadex.*;
import cadex.ModelData.*;
import cadex.Geom.*;
import cadex.Collections.*;
 
import java.util.HashSet;
 
public class brep_topology {
    static {
        try {
            System.loadLibrary("CadExMTK");
        } catch (UnsatisfiedLinkError e) {
            System.err.println("Native code library failed to load.\n" + e);
            System.exit(1);
        }
    }
 
    public static void main(String[] args) {
        String aKey = MTKLicenseKey.Value();
 
        // Activate the license (the key must be defined in MTKLicenseKey.java)
        if (!LicenseManager.Activate(aKey)) {
            System.out.println("Failed to activate Manufacturing Toolkit license.");
            System.exit(1);
        }
 
        if (args.length != 1) {
            System.out.println("Usage: " + " <input_file>, where:");
            System.out.println("    <input_file>  is a name of the file to be read");
            System.exit(1);
        }
 
        String aSource = args[0];
 
        Model aModel = new Model();
 
        if (!new ModelReader().Read(new UTF16String(aSource), aModel)) {
            System.out.println("Failed to read the file");
            System.exit(1);
        }
 
        // Explore B-Rep representation of model parts
        PartBRepVisitor aVisitor = new PartBRepVisitor();
        aModel.Accept(aVisitor);
 
        aVisitor.PrintUniqueShapesCount();
    }
}
 
class UnorientedShapeKey {
    public UnorientedShapeKey(Shape theShape) {
        this.myShape = theShape;
    }
 
    @Override
    public int hashCode() {
        UnorientedShapeHash aHasher = new UnorientedShapeHash();
        return (int) aHasher.Apply(this.myShape);
    }
 
    @Override
    public boolean equals(Object o) {
        if (o == this) {
            return true;
        }
        if (o instanceof UnorientedShapeKey) {
            UnorientedShapeKey aKey = (UnorientedShapeKey) o;
            UnorientedShapeEqual anEqualityChecker = new UnorientedShapeEqual();
            return anEqualityChecker.Apply(this.myShape, aKey.myShape);
        }
        return false;
    }
 
    private Shape myShape;
}
 
class PartBRepVisitor extends ModelElementVoidVisitor {
    public void PrintUniqueShapesCount() {
        System.out.println("Total unique shapes count: " + myShapeSet.size());
    }
 
    @Override
    public void Apply(Part thePart) {
        System.out.println("Part = \"" + thePart.Name() + "\"");
        BodyList aBodies = thePart.Bodies();
        if (!aBodies.isEmpty()) {
            ExploreBRep(aBodies);
        }
    }
 
    private void ExploreBRep(BodyList theBodies) {
        myNestingLevel++;
 
        // Iterate over bodies
        for (int i = 0; i < theBodies.size(); ++i) {
            PrintTabulation();
            Body aBody = theBodies.get(i);
            System.out.println("Body " + i + " : type " + PrintBodyType(aBody));
 
            for (ShapeIterator j = new ShapeIterator(aBody); j.HasNext(); ) {
                Shape aShape = j.Next();
                ExploreShape(aShape);
            }
        }
        myNestingLevel--;
    }
 
    // Recursive iterating over the Shape until reaching vertices
    private void ExploreShape(Shape theShape) {
        myShapeSet.add(new UnorientedShapeKey(theShape));
        ++myNestingLevel;
        ShapeIterator aShapeIt = new ShapeIterator(theShape);
        while (aShapeIt.HasNext()) {
            Shape aShape = aShapeIt.Next();
            PrintShapeInfo(aShape);
            ExploreShape(aShape);
        }
        --myNestingLevel;
    }
 
    // Returns body type name
    String PrintBodyType(Body theBody) {
        if (SheetBody.CompareType(theBody)) {
            return "Sheet";
        } else if (SolidBody.CompareType(theBody)) {
            return "Solid";
        } else if (WireframeBody.CompareType(theBody)) {
            return "Wireframe";
        }
 
        return "Undefined";
    }
 
    // Returns shape type name and prints shape info in some cases
    void PrintShapeInfo(Shape theShape) {
        PrintTabulation();
 
        switch (theShape.Type()) {
            case Solid:
                System.out.println("Solid");
                break;
            case Shell:
                System.out.println("Shell");
                break;
            case Wire:
                System.out.print("Wire");
                PrintWireInfo(Wire.Cast(theShape));
                break;
            case Face:
                System.out.print("Face");
                PrintFaceInfo(Face.Cast(theShape));
                break;
            case Edge:
                System.out.print("Edge");
                PrintEdgeInfo(Edge.Cast(theShape));
                break;
            case Vertex:
                System.out.print("Vertex");
                PrintVertexInfo(Vertex.Cast(theShape));
                break;
            default:
                System.out.print("Undefined");
                break;
        }
    }
 
    private void PrintWireInfo(Wire theWire) {
        System.out.print(". Orientation: " + PrintOrientation(theWire.Orientation()) + "\n");
    }
 
    private void PrintFaceInfo(Face theFace) {
        ++myNestingLevel;
        System.out.print(". Orientation: " + PrintOrientation(theFace.Orientation()) + "\n");
 
        Surface aSurface = theFace.Surface();
        PrintTabulation();
        System.out.print("Surface: " + PrintSurfaceType(aSurface) + "\n");
 
        --myNestingLevel;
    }
 
    private String PrintSurfaceType(Surface theSurface) {
        switch (theSurface.Type()) {
            case Plane:
                return "Plane";
            case Cylinder:
                return "Cylinder";
            case Cone:
                return "Cone";
            case Sphere:
                return "Sphere";
            case Torus:
                return "Torus";
            case LinearExtrusion:
                return "LinearExtrusion";
            case Revolution:
                return "Revolution";
            case Bezier:
                return "Bezier";
            case BSpline:
                return "BSpline";
            case Offset:
                return "Offset";
            default:
                break;
        }
 
        return "Undefined";
    }
 
    private void PrintEdgeInfo(Edge theEdge) {
        ++myNestingLevel;
        if (theEdge.IsDegenerated()) {
            System.out.print("(Degenerated)");
        }
        System.out.print(". Orientation: " + PrintOrientation(theEdge.Orientation()));
        System.out.print(". Tolerance: " + theEdge.Tolerance() + "\n");
 
        if (!theEdge.IsDegenerated()) {
            double[] aFirstParameter = {0}, aLastParameter = {0};
            Curve aCurve = theEdge.Curve(aFirstParameter, aLastParameter);
            PrintTabulation();
            System.out.print("Curve: " + PrintCurveType(aCurve) + "\n");
        }
 
        --myNestingLevel;
    }
 
    private String PrintCurveType(Curve theCurve) {
        switch (theCurve.Type()) {
            case Line:
                return "Line";
            case Circle:
                return "Circle";
            case Ellipse:
                return "Ellipse";
            case Hyperbola:
                return "Hyperbola";
            case Parabola:
                return "Parabola";
            case Bezier:
                return "Bezier";
            case BSpline:
                return "BSpline";
            case Offset:
                return "Offset";
            default:
                break;
        }
 
        return "Undefined";
    }
 
    private void PrintVertexInfo(Vertex theVertex) {
        System.out.print(". Orientation: " + PrintOrientation(theVertex.Orientation()));
        System.out.print(". Tolerance " + theVertex.Tolerance() + "\n");
    }
 
    private String PrintOrientation(ShapeOrientation theOrientation) {
        if (theOrientation == ShapeOrientation.Forward) {
            return "Forward";
        } else if (theOrientation == ShapeOrientation.Reversed) {
            return "Reversed";
        } else {
            return "Undefined";
        }
    }
 
    private void PrintTabulation() {
        for (int i = 0; i < myNestingLevel; ++i) {
            System.out.print("- ");
        }
    }
 
    private int myNestingLevel = 0;
    private HashSet<UnorientedShapeKey> myShapeSet = new HashSet<>();
}