C++ ON_3dVector::IsValid方法代码示例

ON_3dVector ON_Light::PerpindicularDirection() const
{
  // returns a consistent vector perpendicular to the
  // light's direction.  This vector is useful for
  // user interface display.
  ON_3dVector dir = m_direction;
  if ( !dir.IsValid() || !dir.Unitize() )
    return ON_UNSET_VECTOR;

  ON_3dVector xdir;
  if ( IsLinearLight() || IsRectangularLight() )
  {
    xdir = m_length;
    if ( xdir.IsValid() && xdir.Unitize() && fabs(xdir*dir) <= ON_SQRT_EPSILON )
      return xdir;
  }

  if( dir.IsParallelTo( ON_zaxis, ON_DEGREES_TO_RADIANS * 3.0))
    xdir = ON_CrossProduct( dir, ON_xaxis);
  else
    xdir = ON_CrossProduct( dir, ON_zaxis);
  xdir.Unitize();
  ON_3dVector ydir = ON_CrossProduct(dir,xdir);
  ydir.Unitize();
  ON_3dVector right;

  switch(dir.MaximumCoordinateIndex())
  {
  case 0:
    right = (fabs(xdir.y) > fabs(ydir.y)) ? xdir : ydir;
    if ( right.y < 0.0 )
      right.Reverse();
    break;
  case 1:
  case 2:
    right = (fabs(xdir.x) > fabs(ydir.x)) ? xdir : ydir;
    if ( right.x < 0.0 )
      right.Reverse();
    break;
  default:
    right = xdir;
    break;
  }

  if ( right[right.MaximumCoordinateIndex()] < 0.0 )
    right.Reverse();

  return right;  
}

bool ON_Localizer::CreatePlaneLocalizer( ON_3dPoint P, ON_3dVector N, double h0, double h1 )
{
  Destroy();
  if ( P.IsValid()
       && N.IsValid()
       && N.Length() > 0.0
       && ON_IsValid(h0)
       && ON_IsValid(h1)
       && h0 != h1 )
  {
    m_V = N;
    m_V.Unitize();
    m_P.Set( -(m_V.x*P.x + m_V.y*P.y + m_V.z*P.z), 0.0, 0.0 );
    m_d.Set(h0,h1);
    m_type = plane_type;
  }
  return (plane_type == m_type);
}

bool ON_Localizer::CreateCylinderLocalizer( ON_3dPoint P, ON_3dVector V, double r0, double r1 )
{
  Destroy();
  if (    P.IsValid() 
       && V.IsValid() 
       && V.Length() > 0.0 
       && ON_IsValid(r0) 
       && ON_IsValid(r1) 
       && r0 > 0.0
       && r1 > 0.0
       && r0 != r1 )
  {
    m_P = P;
    m_V = V;
    m_V.Unitize();
    m_d.Set(r0,r1);
    m_type = cylinder_type;
  }
  return (cylinder_type == m_type);
}

CRhinoCommand::result CCommandSampleGetPointOnMesh::RunCommand( const CRhinoCommandContext& context )
{
  // Pick a mesh
  CRhinoGetObject go;
  go.SetCommandPrompt( L"Select mesh" );
  go.SetGeometryFilter( CRhinoGetObject::mesh_object );
  go.GetObjects( 1, 1 );
  if( go.CommandResult() != CRhinoCommand::success )
    return go.CommandResult();

  // Validate the pick
  const CRhinoMeshObject* mesh_object = CRhinoMeshObject::Cast( go.Object(0).Object() );
  if( 0 == mesh_object )
    return CRhinoCommand::failure;

  // Pick a point on the mesh
  ON_MESH_POINT point;
  int rc = RhinoGetPointOnMesh( mesh_object, L"Point on mesh", FALSE, point );
  if( rc != 0 )
    return CRhinoCommand::cancel;

  // Add the picked point and print results
  context.m_doc.AddPointObject( point.m_P );
  RhinoApp().Print( L"Added point on face %d, with %g, %g, %g, %g as barycentric coordinates.\n", 
    point.m_face_index, 
    point.m_t[0], 
    point.m_t[1], 
    point.m_t[2], 
    point.m_t[3]
    );

  // Was the pick on a face?
  if( point.m_ci.m_type == ON_COMPONENT_INDEX::mesh_face )
  {
    // Validate mesh
    if( point.m_mesh )
    {
      ON_3dVector normal = ON_UNSET_POINT;

      // Does the mesh have face normals?
      if( point.m_mesh->HasFaceNormals() )
      {
        // Get the face normal
        ON_3fVector normal = point.m_mesh->m_FN[point.m_ci.m_index];
      }
      else
      {
        // Compute the face normal
        if( point.m_mesh->HasDoublePrecisionVertices() )
          point.m_mesh->m_F[point.m_ci.m_index].ComputeFaceNormal( point.m_mesh->DoublePrecisionVertices().Array(), normal );
        else
          point.m_mesh->m_F[point.m_ci.m_index].ComputeFaceNormal( point.m_mesh->m_V.Array(), normal );
      }

      // Validate normal
      if( normal.IsValid() )
      {
        // Add normal line, with arrow, and print results
        ON_Line line( point.m_P, point.m_P + normal );

        ON_3dmObjectAttributes attributes;
        context.m_doc.GetDefaultObjectAttributes( attributes );
        attributes.m_object_decoration = ON::end_arrowhead;

        context.m_doc.AddCurveObject( line, &attributes );
        context.m_doc.Redraw();

        ON_wString normal_str;
        RhinoFormatPoint( normal, normal_str );
        RhinoApp().Print( L"Added line normal to face %d, with % as normal direction.\n", point.m_ci.m_index, normal_str );
      }
    }
  }

  return CRhinoCommand::success;
}

bool ON_BrepExtrude( 
          ON_Brep& brep,
          const ON_Curve& path_curve,
          bool bCap
          )
{
  ON_Workspace ws;
  const int vcount0 = brep.m_V.Count();
  const int tcount0 = brep.m_T.Count();
  const int lcount0 = brep.m_L.Count();
  const int ecount0 = brep.m_E.Count();
  const int fcount0 = brep.m_F.Count();

  const ON_3dPoint PathStart = path_curve.PointAtStart();
  ON_3dPoint P = path_curve.PointAtEnd();
  if ( !PathStart.IsValid() || !P.IsValid() )
    return false;
  const ON_3dVector height = P - PathStart;
  if ( !height.IsValid() || height.Length() <= ON_ZERO_TOLERANCE )
    return false;

  ON_Xform tr;
  tr.Translation(height);

  // count number of new sides
  int side_count = 0;
  int i, vi, ei, fi;
  bool* bSideEdge = (bool*)ws.GetIntMemory(ecount0*sizeof(bSideEdge[0]));
  for ( ei = 0; ei < ecount0; ei++ )
  {
    const ON_BrepEdge& e = brep.m_E[ei];
    if ( 1 == e.m_ti.Count() )
    {
      side_count++;
      bSideEdge[ei] = true;
    }
    else
    {
      bSideEdge[ei] = false;
    }
  }

  brep.m_V.Reserve( 2*vcount0 );
  i = 4*side_count + (bCap?tcount0:0);
  brep.m_T.Reserve( tcount0 + i );
  brep.m_C2.Reserve( brep.m_C2.Count() + i );
  brep.m_L.Reserve( lcount0 + side_count + (bCap?lcount0:0) );
  i = side_count + (bCap?ecount0:side_count);
  brep.m_E.Reserve( ecount0 + i );
  brep.m_C3.Reserve( brep.m_C3.Count() + i );
  i = side_count + (bCap?fcount0:0);
  brep.m_F.Reserve( fcount0 + i );
  brep.m_S.Reserve( brep.m_S.Count() + i );

  bool bOK = true;

  // build top vertices
  int* topvimap = ws.GetIntMemory(vcount0);
  memset(topvimap,0,vcount0*sizeof(topvimap[0]));
  if ( bCap )
  {
    for ( vi = 0; vi < vcount0; vi++ )
    {
      const ON_BrepVertex& bottomv = brep.m_V[vi];
      ON_BrepVertex& topv = brep.NewVertex(bottomv.point+height,bottomv.m_tolerance);
      topvimap[vi] = topv.m_vertex_index;
    }
  }
  else
  {
    for ( ei = 0; ei < ecount0; ei++ )
    {
      if ( bSideEdge[ei] )
      {
        const ON_BrepEdge& bottome = brep.m_E[ei];
        int bottomvi0 = bottome.m_vi[0];
        if ( bottomvi0 < 0 || bottomvi0 >= vcount0 )
        {
          bOK = false;
          break;
        }
        int bottomvi1 = bottome.m_vi[1];
        if ( bottomvi1 < 0 || bottomvi1 >= vcount0 )
        {
          bOK = false;
          break;
        }
        if ( !topvimap[bottomvi0] )
        {
          const ON_BrepVertex& bottomv = brep.m_V[bottomvi0];
          ON_BrepVertex& topv = brep.NewVertex(bottomv.point+height,bottomv.m_tolerance);
          topvimap[bottomvi0] = topv.m_vertex_index;
        }
        if ( !topvimap[bottomvi1] )
        {
          const ON_BrepVertex& bottomv = brep.m_V[bottomvi1];
          ON_BrepVertex& topv = brep.NewVertex(bottomv.point+height,bottomv.m_tolerance);
          topvimap[bottomvi1] = topv.m_vertex_index;
        }
      }
//.........这里部分代码省略.........