Method DetermineRenderAxes

Rendering/Annotation/vtkCubeAxesActor.cxx:1484–1575

------------------------------------------------------------------------------ Determine which of the axes in each coordinate direction actually should be rendered. For STATIC FlyMode, all axes are rendered. For other FlyModes, either 1 or 2 per coordinate direction are rendered.

// be rendered.  For STATIC FlyMode, all axes are rendered.  For other
// FlyModes, either 1 or 2 per coordinate direction are rendered.
void vtkCubeAxesActor::DetermineRenderAxes(vtkViewport* viewport)
{
  double bounds[6];
  double pts[8][3];
  int i = 0, closestIdx = -1, furtherstIdx = -1;
  int xloc = 0, yloc = 0, zloc = 0;

  // Make sure we start with only one axis by default, then we might extend it
  this->NumberOfAxesX = this->NumberOfAxesY = this->NumberOfAxesZ = 1;

  // Compute relevant axis points only if a axis/grid visibility change based
  // on the viewpoint
  if (!(this->GridLineLocation == VTK_GRID_LINES_ALL &&
        (this->FlyMode == VTK_FLY_STATIC_EDGES || this->FlyMode == VTK_FLY_STATIC_TRIAD)))
  {
    // determine the bounds to use (input, prop, or user-defined)
    this->GetBounds(bounds);
    this->TransformBounds(viewport, bounds, pts);
  }

  // Check closest point if needed
  if (this->GridLineLocation == VTK_GRID_LINES_CLOSEST || this->FlyMode == VTK_FLY_CLOSEST_TRIAD)
  {
    closestIdx = this->FindClosestAxisIndex(pts);
  }

  // Check furthest point if needed
  if (this->GridLineLocation == VTK_GRID_LINES_FURTHEST || this->FlyMode == VTK_FLY_FURTHEST_TRIAD)
  {
    furtherstIdx = this->FindFurtherstAxisIndex(pts);
  }

  // Manage fast static axis visibility
  if (this->FlyMode == VTK_FLY_STATIC_EDGES || this->FlyMode == VTK_FLY_STATIC_TRIAD)
  {
    if (this->FlyMode == VTK_FLY_STATIC_EDGES)
    {
      this->NumberOfAxesX = this->NumberOfAxesY = this->NumberOfAxesZ = NUMBER_OF_ALIGNED_AXIS;
    }

    for (i = 0; i < this->NumberOfAxesX; i++)
    {
      this->RenderAxesX[i] = this->RenderAxesY[i] = this->RenderAxesZ[i] = i;
    }

    this->UpdateGridLineVisibility(
      (this->GridLineLocation == VTK_GRID_LINES_CLOSEST) ? closestIdx : furtherstIdx);
    return;
  }

  // Take into account the inertia. Process only so often.
  if (this->RenderCount == 0 || !((this->RenderCount + 1) % this->Inertia))
  {
    if (this->FlyMode == VTK_FLY_CLOSEST_TRIAD)
    {
      xloc = vtkCubeAxesActorTriads[closestIdx][0];
      yloc = vtkCubeAxesActorTriads[closestIdx][1];
      zloc = vtkCubeAxesActorTriads[closestIdx][2];