Method MouseMoveEvent

Views/Infovis/vtkHeatmapItem.cxx:752–785

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

//------------------------------------------------------------------------------
bool vtkHeatmapItem::MouseMoveEvent(const vtkContextMouseEvent& event)
{
  if (event.GetButton() == vtkContextMouseEvent::NO_BUTTON)
  {
    float pos[3];
    vtkNew<vtkMatrix3x3> inverse;
    pos[0] = event.GetPos().GetX();
    pos[1] = event.GetPos().GetY();
    pos[2] = 0;
    this->GetScene()->GetTransform()->GetInverse(inverse);
    inverse->MultiplyPoint(pos, pos);
    if (pos[0] <= this->MaxX && pos[0] >= this->MinX && pos[1] <= this->MaxY &&
      pos[1] >= this->MinY)
    {
      this->Tooltip->SetPosition(pos[0], pos[1]);

      std::string tooltipText = this->GetTooltipText(pos[0], pos[1]);
      if (!tooltipText.empty())
      {
        this->Tooltip->SetText(tooltipText);
        this->Tooltip->SetVisible(true);
        this->Scene->SetDirty(true);
        return true;
      }
    }
    bool shouldRepaint = this->Tooltip->GetVisible();
    this->Tooltip->SetVisible(false);
    if (shouldRepaint)
    {
      this->Scene->SetDirty(true);
    }
  }
  return false;
}

//------------------------------------------------------------------------------
std::string vtkHeatmapItem::GetTooltipText(float x, float y)