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salome-geom  6.5.0
Functions
GEOMAlgo_BuilderTools.cxx File Reference
#include <GEOMAlgo_BuilderTools.hxx>
#include <Basics_OCCTVersion.hxx>
#include <TColStd_Array1OfReal.hxx>
#include <gp_Pnt2d.hxx>
#include <gp_Vec.hxx>
#include <gp_Dir.hxx>
#include <gp_Pnt.hxx>
#include <TColgp_Array1OfPnt.hxx>
#include <Poly_Triangulation.hxx>
#include <Poly_Array1OfTriangle.hxx>
#include <Poly_Triangle.hxx>
#include <Geom2d_Curve.hxx>
#include <Geom2dInt_Geom2dCurveTool.hxx>
#include <TopLoc_Location.hxx>
#include <TopAbs_Orientation.hxx>
#include <TopoDS_Face.hxx>
#include <TopoDS_Iterator.hxx>
#include <TopoDS_Wire.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Edge.hxx>
#include <TopExp_Explorer.hxx>
#include <BRep_Tool.hxx>
#include <BRepBndLib.hxx>
#include <BRepMesh_FastDiscret.hxx>
#include <Bnd_Box.hxx>
#include <BRepAdaptor_Curve2d.hxx>

Go to the source code of this file.

Functions

static Standard_Integer ComputeProps (const TopoDS_Face &aF, Standard_Real &aA, Standard_Real &aV)
static void BuildTriangulation (const TopoDS_Face &aF)

Function Documentation

void BuildTriangulation ( const TopoDS_Face &  aF) [static]

Definition at line 249 of file GEOMAlgo_BuilderTools.cxx.

{
  Standard_Boolean bWithShare;
  Standard_Real aDiscret, aXmin, aYmin, aZmin, aXmax, aYmax, aZmax;
  Standard_Real dX, dY, dZ, dMax, aCoeff, aAngle;
  Bnd_Box aBox;
  //
  bWithShare=Standard_False;
  aAngle=0.5;
  //
  BRepBndLib::Add(aF, aBox);
  //
  // aDiscret
  aBox.Get(aXmin, aYmin, aZmin, aXmax, aYmax, aZmax);
  dX=aXmax-aXmin;
  dY=aYmax-aYmin;
  dZ=aZmax-aZmin;
  dMax=dX;
  if (dY>dMax) {
    dMax=dY;
  }
  if (dZ>dMax) {
    dMax=dZ;
  }
  //
  aCoeff=0.1;
  aDiscret=aCoeff*dMax;
  //
  BRepMesh_FastDiscret aMesher(aDiscret,
                               aAngle,
                               aBox,
                               bWithShare,
                               Standard_True,
                               Standard_False,
                               Standard_True);

#if OCC_VERSION_LARGE > 0x06050100 // for OCC-6.5.2 and higher version
  TopTools_IndexedDataMapOfShapeListOfShape anAncestors;
  TopExp::MapShapesAndAncestors(aF, TopAbs_EDGE, TopAbs_FACE, anAncestors);
  aMesher.Add(aF, anAncestors);
#else
  aMesher.Add(aF);
#endif
}

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Standard_Integer ComputeProps ( const TopoDS_Face &  aF,
Standard_Real &  aA,
Standard_Real &  aV 
) [static]

Definition at line 176 of file GEOMAlgo_BuilderTools.cxx.

{
  Standard_Integer j, i, i1, i2, aNbNodes, aNbTrigs, n[3];
  Standard_Real aAi, aVi;
  gp_Pnt aP[3], aGC, aGC1;
  TopLoc_Location aLoc;
  TopAbs_Orientation aOr;
  Handle(Poly_Triangulation) aTri;
  //
  aA=0.;
  aV=0.;
  //
  aTri=BRep_Tool::Triangulation(aF, aLoc);
  if(aTri.IsNull()) {
    BuildTriangulation(aF);
    aTri=BRep_Tool::Triangulation(aF, aLoc);
    if(aTri.IsNull()) {
      return 1;// a face is without triangulation
    }
  }
  //
  aNbNodes=aTri->NbNodes();
  aNbTrigs=aTri->NbTriangles();
  if (!aNbTrigs){
    return 2;//no triangles
  }
  //
  aOr=aF.Orientation();
  //
  const TColgp_Array1OfPnt& aNodes=aTri->Nodes();
  const Poly_Array1OfTriangle& aTriangles=aTri->Triangles();
  //
  i1=aTriangles.Lower();
  i2=aTriangles.Upper();
  //
  for (i=i1; i<=i2; ++i){
    const Poly_Triangle& aTriangle=aTriangles.Value(i);
    aTriangle.Get(n[0], n[1], n[2]);
    aGC.SetCoord(0.,0.,0.);
    for (j=0; j<3; ++j) {
      aP[j]=aNodes.Value(n[j]);
      aGC.ChangeCoord()+=aP[j].XYZ();
    }
    aGC.ChangeCoord()*=0.333333333333;
    //
    // Normal
    gp_Vec aV01(aP[0], aP[1]);
    gp_Vec aV12(aP[1], aP[2]);
    gp_Vec aVN=aV01^aV12;
    aAi=aVN.Magnitude();
    aA=aA+aAi;
    //
    if (aAi>0.0000001) {
      Standard_Real aSx, aZx;
      gp_Dir aDN(aVN);
      if (aOr==TopAbs_REVERSED) {
        aDN.Reverse();
      }
      //
      aSx=aAi*aDN.Z();
      aZx=aGC.Z();
      aVi=aZx*aSx;
      aV=aV+aVi;
    }
  }
  return 0;
}

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