Method GetTooltipText

Views/Infovis/vtkHeatmapItem.cxx:788–845

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std::string vtkHeatmapItem::GetTooltipText(float x, float y)
{
  int sceneRow = 0;
  int sceneColumn = 0;
  int orientation = this->GetOrientation();
  if (orientation == vtkHeatmapItem::UP_TO_DOWN || orientation == vtkHeatmapItem::DOWN_TO_UP)
  {
    sceneRow = static_cast<int>(floor(fabs(x - this->Position[0]) / this->CellHeight));
    sceneColumn = static_cast<int>(floor((y - this->MinY) / this->CellWidth));
  }
  else
  {
    sceneRow = static_cast<int>(floor(fabs(y - this->Position[1]) / this->CellHeight));
    sceneColumn = static_cast<int>(floor((x - this->MinX) / this->CellWidth));
  }

  vtkIdType row = -1;
  if (static_cast<unsigned int>(sceneRow) < this->SceneRowToTableRowMap.size())
  {
    row = this->SceneRowToTableRowMap[sceneRow];
  }
  vtkIdType column = -1;
  if (static_cast<unsigned int>(sceneColumn) < this->SceneColumnToTableColumnMap.size())
  {
    column = this->SceneColumnToTableColumnMap[sceneColumn];
  }

  if (row > -1 && column > -1)
  {
    std::string rowName;
    if (this->RowNames)
    {
      rowName = this->RowNames->GetValue(row);
    }
    else
    {
      std::stringstream ss;
      ss << row;
      rowName = ss.str();
    }
    if (this->BlankRows.find(rowName) != this->BlankRows.end())
    {
      return "";
    }

    std::string columnName = this->Table->GetColumn(column)->GetName();

    std::string tooltipText = "(";
    tooltipText += rowName;
    tooltipText += ", ";
    tooltipText += columnName;
    tooltipText += ")\n";
    tooltipText += this->Table->GetValue(row, column).ToString();

    return tooltipText;
  }
  return "";
}