OCCEdge.cpp

// Gmsh - Copyright (C) 1997-2010 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// bugs and problems to <gmsh@geuz.org>.

#include <limits>
#include "GmshConfig.h"
#include "GmshMessage.h"
#include "GModel.h"
#include "OCCEdge.h"
#include "OCCFace.h"
#include "Context.h"

#if defined(HAVE_OCC)
#include "Geom2dLProp_CLProps2d.hxx"
#include "Geom_BezierCurve.hxx"
#include "Geom_OffsetCurve.hxx"
#include "Geom_Ellipse.hxx"
#include "Geom_Parabola.hxx"
#include "Geom_Hyperbola.hxx"
#include "Geom_TrimmedCurve.hxx"
#include "Geom_Circle.hxx"
#include "Geom_Line.hxx"
#include "Geom_Conic.hxx"

OCCEdge::OCCEdge(GModel *model, TopoDS_Edge edge, int num, GVertex *v1, GVertex *v2)
  : GEdge(model, num, v1, v2), c(edge), trimmed(0)
{
  curve = BRep_Tool::Curve(c, s0, s1);
  // build the reverse curve
  c_rev = c;
  c_rev.Reverse();
}

Range<double> OCCEdge::parBounds(int i) const
{ 
  return Range<double>(s0, s1);
}

void OCCEdge::setTrimmed(OCCFace *f)
{
  if (!trimmed){
    trimmed = f;
    const TopoDS_Face *s = (TopoDS_Face*) trimmed->getNativePtr();
    curve2d = BRep_Tool::CurveOnSurface(c, *s, s0, s1);
    if(curve2d.IsNull()) trimmed = 0;
  }
}

SPoint2 OCCEdge::reparamOnFace(const GFace *face, double epar, int dir) const
{
  const TopoDS_Face *s = (TopoDS_Face*) face->getNativePtr();
  double t0, t1;
  Handle(Geom2d_Curve) c2d;

  if(dir == 1){
    c2d = BRep_Tool::CurveOnSurface(c, *s, t0, t1);
  }
  else{
    c2d = BRep_Tool::CurveOnSurface(c_rev, *s, t0, t1);
  }
  
  if(c2d.IsNull()){
    Msg::Fatal("Reparam on face failed: curve %d is not on surface %d",
               tag(), face->tag());
  }

  double u, v;
  gp_Pnt2d pnt = c2d->Value(epar);
  pnt.Coord(u, v);

  // sometimes OCC miserably fails ...
  GPoint p1 = point(epar);
  GPoint p2 = face->point(u, v);
  const double dx = p1.x()-p2.x();
  const double dy = p1.y()-p2.y();
  const double dz = p1.z()-p2.z();
  if(sqrt(dx * dx + dy * dy + dz * dz) > 1.e-4 * CTX::instance()->lc){
    // return reparamOnFace(face, epar,-1);      
    Msg::Warning("Reparam on face partially failed for curve %d surface %d at point %g",
                 tag(), face->tag(), epar);
    Msg::Warning("On the face %d local (%g %g) global (%g %g %g)",
                 face->tag(), u, v, p2.x(), p2.y(), p2.z());
    Msg::Warning("On the edge %d local (%g) global (%g %g %g)",
                 tag(), epar, p1.x(), p1.y(), p1.z());
    // GPoint ppp = face->closestPoint(SPoint3(p1.x(), p1.y(), p1.z()));
    // return SPoint2(ppp.u(), ppp.v());
  }
  return SPoint2(u, v);
}

// True if the edge is a seam for the given face
bool OCCEdge::isSeam(const GFace *face) const
{
  if (face->geomType() == GEntity::CompoundSurface)return false; 
  const TopoDS_Face *s = (TopoDS_Face*) face->getNativePtr();
  BRepAdaptor_Surface surface(*s);
  //  printf("asking if edge %d is a seam of face %d\n",tag(),face->tag());
  //  printf("periodic %d %d\n",surface.IsUPeriodic(),surface.IsVPeriodic());
  //  if(surface.IsUPeriodic() || surface.IsVPeriodic()){
  return BRep_Tool::IsClosed(c, *s);
  //  }
  // return false;
}

GPoint OCCEdge::point(double par) const
{
  if(trimmed){
    double u, v;
    curve2d->Value(par).Coord(u, v);
    return trimmed->point(u, v);
  }
  else if(!curve.IsNull()){
    gp_Pnt pnt = curve->Value(par);
    return GPoint(pnt.X(), pnt.Y(), pnt.Z());
  }
  else{
    Msg::Warning("OCC Curve %d is neither a 3D curve not a trimmed curve", tag());
    return GPoint(0, 0, 0);
  }
}

SVector3 OCCEdge::firstDer(double par) const
{  
  BRepAdaptor_Curve brepc(c);
  BRepLProp_CLProps prop(brepc, 1, 1e-5);
  prop.SetParameter(par);
  gp_Vec d1 = prop.D1();
  return SVector3(d1.X(), d1.Y(), d1.Z());
}

GEntity::GeomType OCCEdge::geomType() const
{
  if(curve.IsNull()){
    if (curve2d->DynamicType() == STANDARD_TYPE(Geom_Circle))
      return Circle;
    else if (curve2d->DynamicType() == STANDARD_TYPE(Geom_Line))
      return Line;
    else if (curve2d->DynamicType() == STANDARD_TYPE(Geom_Ellipse))
      return Ellipse;
    else if (curve2d->DynamicType() == STANDARD_TYPE(Geom_Parabola))
      return Parabola;
    else if (curve2d->DynamicType() == STANDARD_TYPE(Geom_Hyperbola))
      return Hyperbola;
    else if (curve2d->DynamicType() == STANDARD_TYPE(Geom_TrimmedCurve))
      return TrimmedCurve;
    else if (curve2d->DynamicType() == STANDARD_TYPE(Geom_OffsetCurve))
      return OffsetCurve;
    else if (curve2d->DynamicType() == STANDARD_TYPE(Geom_BSplineCurve))
      return BSpline;
    else if (curve2d->DynamicType() == STANDARD_TYPE(Geom_BezierCurve))
      return Bezier;
    else if (curve2d->DynamicType() == STANDARD_TYPE(Geom_Conic))
      return Conic;
    return Unknown;
  }
  else{
    if (curve->DynamicType() == STANDARD_TYPE(Geom_Circle))
      return Circle;
    else if (curve->DynamicType() == STANDARD_TYPE(Geom_Line))
      return Line;
    else if (curve->DynamicType() == STANDARD_TYPE(Geom_Parabola))
      return Parabola;
    else if (curve->DynamicType() == STANDARD_TYPE(Geom_Hyperbola))
      return Hyperbola;
    else if (curve->DynamicType() == STANDARD_TYPE(Geom_TrimmedCurve))
      return TrimmedCurve;
    else if (curve->DynamicType() == STANDARD_TYPE(Geom_OffsetCurve))
      return OffsetCurve;
    else if (curve->DynamicType() == STANDARD_TYPE(Geom_Ellipse))
      return Ellipse;
    else if (curve->DynamicType() == STANDARD_TYPE(Geom_BSplineCurve))
      return BSpline;
    else if (curve->DynamicType() == STANDARD_TYPE(Geom_BezierCurve))
      return Bezier;
    else if (curve2d->DynamicType() == STANDARD_TYPE(Geom_Conic))
      return Conic;
    return Unknown;
  }
}

int OCCEdge::minimumMeshSegments() const
{
  int np;
  if(geomType() == Line)
    np = GEdge::minimumMeshSegments();
  else 
    np = CTX::instance()->mesh.minCurvPoints - 1;
  
  // if the edge is closed, ensure that at least 3 points are
  // generated in the 1D mesh (4 segments, one of which is
  // degenerated)
  if (getBeginVertex() == getEndVertex()) np = std::max(4, np);

  return std::max(np, meshAttributes.minimumMeshSegments);
}

int OCCEdge::minimumDrawSegments() const
{
  if(geomType() == Line)
    return GEdge::minimumDrawSegments();
  else
    return CTX::instance()->geom.numSubEdges * GEdge::minimumDrawSegments();
}

double OCCEdge::curvature(double par) const 
{
  const double eps = 1.e-15;

  Standard_Real Crv;
  if (curve.IsNull()){
    Geom2dLProp_CLProps2d aCLProps(curve2d, 2, eps);
    aCLProps.SetParameter(par);
    if(!aCLProps.IsTangentDefined())
      Crv = eps;
    else
      Crv = aCLProps.Curvature();
  }
  else{
    BRepAdaptor_Curve brepc(c);
    BRepLProp_CLProps prop(brepc, 2, eps);
    prop.SetParameter(par); 
    if(!prop.IsTangentDefined())
      Crv = eps;
    else
      Crv = prop.Curvature();
  }
  if(Crv <= eps) Crv = eps;
  return Crv;
}

void OCCEdge::writeGEO(FILE *fp)
{
  if(geomType() == Circle){
    gp_Pnt center;
    if(curve.IsNull()){
      center = Handle(Geom_Circle)::DownCast(curve2d)->Location();
    }
    else{
      center = Handle(Geom_Circle)::DownCast(curve)->Location();
    }
    // GEO supports only circle arcs < Pi
    if(s1 - s0 < M_PI){
      fprintf(fp, "p%d = newp;\n", tag());
      fprintf(fp, "Point(p%d + 1) = {%.16g, %.16g, %.16g};\n", 
              tag(), center.X(), center.Y(), center.Z());
      fprintf(fp, "Circle(%d) = {%d, p%d + 1, %d};\n", 
              tag(), getBeginVertex()->tag(), tag(), getEndVertex()->tag());
    }
    else
      GEdge::writeGEO(fp);
  }
  else
    GEdge::writeGEO(fp);
}

#endif