Method BuildAxis

Rendering/Annotation/vtkAxisActor.cxx:320–436

----------------------------------------------------------------------------- Perform some initialization, determine which Axis type we are -----------------------------------------------------------------------------

// Perform some initialization, determine which Axis type we are
//-----------------------------------------------------------------------------*
void vtkAxisActor::BuildAxis(vtkViewport* viewport, bool force)
{
  // We'll do our computation in world coordinates. First determine the
  // location of the endpoints.
  double *x, p1[3], p2[3];
  x = this->Point1Coordinate->GetValue();
  p1[0] = x[0];
  p1[1] = x[1];
  p1[2] = x[2];
  x = this->Point2Coordinate->GetValue();
  p2[0] = x[0];
  p2[1] = x[1];
  p2[2] = x[2];

  //
  //  Test for axis of zero length.
  //
  if (p1[0] == p2[0] && p1[1] == p2[1] && p1[2] == p2[2])
  {
    vtkDebugMacro(<< "Axis has zero length, not building.");
    this->AxisHasZeroLength = true;
    return;
  }
  this->AxisHasZeroLength = false;

  if (!force && this->GetMTime() < this->BuildTime.GetMTime() &&
    viewport->GetMTime() < this->BuildTime.GetMTime())
  {
    return; // already built
  }

  if (this->Log)
  {
    if (this->Range[0] <= 0.0)
    {
      vtkWarningMacro(<< "Range value undefined for log scale enabled. "
                      << "Current Range: (" << this->Range[0] << ", " << this->Range[1] << ")"
                      << "Range[0] must be > 0.0. "
                      << ".");
      return;
    }
    if (this->MinorRangeStart <= 0.0 || this->MajorRangeStart <= 0.0)
    {
      vtkWarningMacro(
        << "MinorRangeStart value or MajorRangeStart value undefined for log scale enabled"
        << "MinorRangeStart: " << this->MinorRangeStart
        << ", MajorRangeStart: " << this->MajorRangeStart << ". "
        << "MinorRangeStart and MajorRangeStart must be > 0.0. "
        << ".");
      return;
    }
  }

  vtkDebugMacro(<< "Rebuilding axis");

  if (force || this->GetProperty()->GetMTime() > this->BuildTime.GetMTime())
  {
    this->UpdateTitleActorProperty();