Method MouseButtonPressEvent

Charts/Core/vtkChartParallelCoordinates.cxx:656–737

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
bool vtkChartParallelCoordinates::MouseButtonPressEvent(const vtkContextMouseEvent& mouse)
{
  if (mouse.GetButton() == this->Actions.Select())
  {
    int selectionMode = this->GetSelectionModeFromMouseModifiers(mouse);
    this->SetSelectionMode(selectionMode);

    // Select an axis if we are within range
    if (mouse.GetScenePos()[1] > this->Point1[1] && mouse.GetScenePos()[1] < this->Point2[1])
    {
      // Iterate over the axes, see if we are within 10 pixels of an axis
      for (size_t i = 0; i < this->Storage->Axes.size(); ++i)
      {
        vtkAxis* axis = this->Storage->Axes[i];
        if (axis->GetPoint1()[0] - 10 < mouse.GetScenePos()[0] &&
          axis->GetPoint1()[0] + 10 > mouse.GetScenePos()[0])
        {
          this->Storage->CurrentAxis = static_cast<int>(i);

          if (this->GetSelectionMode() == vtkContextScene::SELECTION_DEFAULT &&
            this->Storage->ShouldClearCurrentAxeSelection)
          {
            this->ResetAxeSelection(this->Storage->CurrentAxis);
            this->Storage->ShouldClearCurrentAxeSelection = false;
          }

          // This is a manual interactive selection
          this->Storage->InteractiveSelection = true;

          // Transform into normalized coordinates
          float low = mouse.GetScenePos()[1];
          low -= this->Storage->Transform->GetMatrix()->GetElement(1, 2);
          low /= this->Storage->Transform->GetMatrix()->GetElement(1, 1);
          std::array<float, 2>& range = this->Storage->CurrentSelection;
          range[0] = range[1] = low;

          this->Scene->SetDirty(true);
          return true;
        }
      }
    }
    this->Storage->CurrentAxis = -1;
    this->Scene->SetDirty(true);
    return true;
  }
  else if (mouse.GetButton() == this->Actions.Pan())
  {
    // Middle mouse button - move and zoom the axes
    // Iterate over the axes, see if we are within 10 pixels of an axis
    for (size_t i = 0; i < this->Storage->Axes.size(); ++i)
    {
      vtkAxis* axis = this->Storage->Axes[i];
      if (axis->GetPoint1()[0] - 10 < mouse.GetScenePos()[0] &&
        axis->GetPoint1()[0] + 10 > mouse.GetScenePos()[0])
      {
        this->Storage->CurrentAxis = static_cast<int>(i);
        if (mouse.GetScenePos().GetY() > axis->GetPoint1()[1] &&
          mouse.GetScenePos().GetY() < axis->GetPoint1()[1] + 20)