Method BuildTickPoints

Rendering/Annotation/vtkAxisActor.cxx:1748–1834

------------------------------------------------------------------------------ Creates points for ticks (minor, major, gridlines) in correct position for a generic axis. ------------------------------------------------------------------------------

// for a generic axis.
//------------------------------------------------------------------------------
bool vtkAxisActor::BuildTickPoints(double p1[3], double p2[3], bool force)
{
  // Prevent any unwanted computation
  if (!force && (this->AxisPosition == this->LastAxisPosition) &&
    (this->TickLocation == this->LastTickLocation) &&
    (this->BoundsTime.GetMTime() < this->BuildTime.GetMTime()) &&
    (this->Point1Coordinate->GetMTime() < this->BuildTickPointsTime.GetMTime()) &&
    (this->Point2Coordinate->GetMTime() < this->BuildTickPointsTime.GetMTime()) &&
    (this->Range[0] == this->LastRange[0]) && (this->Range[1] == this->LastRange[1]))
  {
    return false;
  }

  // Reset previous objects
  this->MinorTickPts->Reset();
  this->MajorTickPts->Reset();
  this->GridlinePts->Reset();
  this->InnerGridlinePts->Reset();
  this->GridpolyPts->Reset();

  // As we assume that the Axis is not necessary aligned to the absolute X/Y/Z
  // axis, we will convert the absolute XYZ information to relative one
  // using a base composed as follow (axis, u, v)

  double coordSystem[3][3]; // axisVector, uVector, vVector

  switch (this->AxisType)
  {
    case VTK_AXIS_TYPE_X:
      memcpy(&coordSystem[0], this->AxisBaseForX, 3 * sizeof(double));
      memcpy(&coordSystem[1], this->AxisBaseForY, 3 * sizeof(double));
      memcpy(&coordSystem[2], this->AxisBaseForZ, 3 * sizeof(double));
      break;

    case VTK_AXIS_TYPE_Y:
      memcpy(&coordSystem[0], this->AxisBaseForY, 3 * sizeof(double));
      memcpy(&coordSystem[1], this->AxisBaseForX, 3 * sizeof(double));
      memcpy(&coordSystem[2], this->AxisBaseForZ, 3 * sizeof(double));
      break;

    case VTK_AXIS_TYPE_Z:
      memcpy(&coordSystem[0], this->AxisBaseForZ, 3 * sizeof(double));
      memcpy(&coordSystem[1], this->AxisBaseForX, 3 * sizeof(double));
      memcpy(&coordSystem[2], this->AxisBaseForY, 3 * sizeof(double));
      break;

    default:
      // shouldn't get here
      break;
  }

  //-----------------------------------------------------------------------------*
  // Build Minor Ticks
  //-----------------------------------------------------------------------------*
  if (this->Log)
  {
    this->BuildMinorTicksLog(p1, p2, coordSystem);
  }