Method UpdateLayout

Charts/Core/vtkChartXY.cxx:968–1095

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

//------------------------------------------------------------------------------
bool vtkChartXY::UpdateLayout(vtkContext2D* painter)
{
  // The main use of this method is currently to query the visible axes for
  // their bounds, and to update the chart in response to that.
  bool changed = false;

  vtkVector2i tileScale = this->Scene->GetLogicalTileScale();
  vtkVector2i hiddenAxisBorder = tileScale * this->HiddenAxisBorder;

  // Axes
  if (this->LayoutStrategy == vtkChart::FILL_SCENE || this->LayoutStrategy == vtkChart::FILL_RECT)
  {
    for (int i = 0; i < 4; ++i)
    {
      int border = 0;
      vtkAxis* axis = this->ChartPrivate->axes[i];
      axis->Update();
      if (axis->GetVisible())
      {
        vtkRectf bounds = axis->GetBoundingRect(painter);
        if (i == vtkAxis::TOP || i == vtkAxis::BOTTOM)
        { // Horizontal axes
          border = int(bounds.GetHeight());
        }
        else
        { // Vertical axes
          border = int(bounds.GetWidth());
        }
      }
      border += this->GetLegendBorder(painter, i);
      if (i == vtkAxis::TOP)
      {
        painter->ApplyTextProp(this->TitleProperties);
        float bounds[4];
        painter->ComputeStringBounds(this->Title, bounds);
        if (bounds[3] > 0)
        {
          border += (5 * tileScale.GetY()) /* title margin */
            + bounds[3];                   // add the title text height to the border.
        }
      }

      if (i == vtkAxis::TOP || i == vtkAxis::BOTTOM)
      {
        border = std::max(border, hiddenAxisBorder.GetY());
      }
      else
      {
        border = std::max(border, hiddenAxisBorder.GetX());
      }

      if (this->ChartPrivate->Borders[i] != border)
      {
        this->ChartPrivate->Borders[i] = border;
        changed = true;
      }
    }
  }