Method UpdateContinuousCursor

Interaction/Widgets/vtkImagePlaneWidget.cxx:2085–2122

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//------------------------------------------------------------------------------
int vtkImagePlaneWidget::UpdateContinuousCursor(double* q)
{
  double tol2;
  vtkCell* cell;
  vtkPointData* pd;
  int subId;
  double pcoords[3], weights[8];

  this->CurrentCursorPosition[0] = q[0];
  this->CurrentCursorPosition[1] = q[1];
  this->CurrentCursorPosition[2] = q[2];

  pd = this->ImageData->GetPointData();

  vtkPointData* outPD = vtkPointData::New();
  outPD->InterpolateAllocate(pd, 1, 1);

  // Use tolerance as a function of size of source data
  //
  tol2 = this->ImageData->GetLength();
  tol2 = tol2 ? tol2 * tol2 / 1000.0 : 0.001;

  // Find the cell that contains q and get it
  //
  cell = this->ImageData->FindAndGetCell(q, nullptr, -1, tol2, subId, pcoords, weights);
  int found = 0;
  if (cell)
  {
    // Interpolate the point data
    //
    outPD->InterpolatePoint(pd, 0, cell->PointIds, weights);
    this->CurrentImageValue = outPD->GetScalars()->GetTuple1(0);
    found = 1;
  }

  outPD->Delete();
  return found;
}

//------------------------------------------------------------------------------
int vtkImagePlaneWidget::UpdateDiscreteCursor(double* q)