OpenCASCADE BRepMesh - 2D Delaunay Triangulation

/*

Copyright(C) 2017 Shing Liu(eryar@163.com)

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files(the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and / or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions :

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

*/

#include <math_BullardGenerator.hxx>

#include <BRepMesh.hxx>

#include <BRepMesh_Delaun.hxx>

#include <BRepMesh_DataStructureOfDelaun.hxx>

#pragma comment(lib, "TKernel.lib")

#pragma comment(lib, "TKMath.lib")

#pragma comment(lib, "TKG2d.lib")

#pragma comment(lib, "TKG3d.lib")

#pragma comment(lib, "TKGeomBase.lib")

#pragma comment(lib, "TKGeomAlgo.lib")

#pragma comment(lib, "TKBRep.lib")

#pragma comment(lib, "TKTopAlgo.lib")

#pragma comment(lib, "TKMesh.lib")

void testMesh(Standard_Integer thePointCount)

{

    std::ofstream aTclFile("d:/mesh.tcl");

    math_BullardGenerator aRandom;

    BRepMesh::Array1OfVertexOfDelaun aVertices(, thePointCount);

    for (Standard_Integer i = aVertices.Lower(); i <= aVertices.Upper(); ++i)

    {

        gp_XY aPoint;

        aPoint.SetX(aRandom.NextReal() * aVertices.Upper());

        aPoint.SetY(aRandom.NextReal() * aVertices.Upper());

        BRepMesh_Vertex aVertex(aPoint, i, BRepMesh_Frontier);

        aVertices.SetValue(i, aVertex);

        // output point to Draw Test Harness.

        aTclFile << "vpoint p" << i << " " << aPoint.X() << " " << aPoint.Y() << "" << std::endl;

    }

    BRepMesh_Delaun aDelaunay(aVertices);

    Handle(BRepMesh_DataStructureOfDelaun) aMeshStructure = aDelaunay.Result();

    const BRepMesh::MapOfInteger& aTriangles = aMeshStructure->ElementsOfDomain();

    BRepMesh::MapOfInteger::Iterator aTriangleIt(aTriangles);

    for (aTriangleIt; aTriangleIt.More(); aTriangleIt.Next())

    {

        const Standard_Integer aTriangleId = aTriangleIt.Key();

        const BRepMesh_Triangle& aCurrentTriangle = aMeshStructure->GetElement(aTriangleId);

        if (aCurrentTriangle.Movability() == BRepMesh_Deleted)

        {

            continue;

        }

        Standard_Integer aTriangleVerts[];

        aMeshStructure->ElementNodes(aCurrentTriangle, aTriangleVerts);

        // output line to Draw Test Harness.

        aTclFile << "vline l" << aTriangleId << "1 p" << aTriangleVerts[] << " p" << aTriangleVerts[] << std::endl;

        aTclFile << "vline l" << aTriangleId << "2 p" << aTriangleVerts[] << " p" << aTriangleVerts[] << std::endl;

        aTclFile << "vline l" << aTriangleId << "3 p" << aTriangleVerts[] << " p" << aTriangleVerts[] << std::endl;

    }

    aTclFile.close();

}

int main(int argc, char* argv[])

{

    testMesh();

    return ;

}