Method MouseMoveEvent

Charts/Core/vtkInteractiveArea.cxx:125–166

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//------------------------------------------------------------------------------
bool vtkInteractiveArea::MouseMoveEvent(const vtkContextMouseEvent& mouse)
{
  if (mouse.GetButton() == this->Actions->Pan())
  {
    // Figure out how much the mouse has moved by in plot coordinates - pan
    vtkVector2d scenePos(mouse.GetScenePos().Cast<double>().GetData());
    vtkVector2d lastScenePos(mouse.GetLastScenePos().Cast<double>().GetData());
    vtkVector2d pos(0.0, 0.0);
    vtkVector2d last(0.0, 0.0);

    // Go from screen to scene coordinates to work out the delta
    vtkAxis* xAxis = this->BottomAxis;
    vtkAxis* yAxis = this->LeftAxis;
    vtkTransform2D* transform = this->Transform->GetTransform();
    transform->InverseTransformPoints(scenePos.GetData(), pos.GetData(), 1);
    transform->InverseTransformPoints(lastScenePos.GetData(), last.GetData(), 1);
    vtkVector2d delta = last - pos;
    delta[0] /= xAxis->GetScalingFactor();
    delta[1] /= yAxis->GetScalingFactor();

    // Now move the axis and recalculate the transform
    delta[0] = delta[0] > 0 ? std::min(delta[0], xAxis->GetMaximumLimit() - xAxis->GetMaximum())
                            : std::max(delta[0], xAxis->GetMinimumLimit() - xAxis->GetMinimum());

    delta[1] = delta[1] > 0 ? std::min(delta[1], yAxis->GetMaximumLimit() - yAxis->GetMaximum())
                            : std::max(delta[1], yAxis->GetMinimumLimit() - yAxis->GetMinimum());

    xAxis->SetMinimum(xAxis->GetMinimum() + delta[0]);
    xAxis->SetMaximum(xAxis->GetMaximum() + delta[0]);
    yAxis->SetMinimum(yAxis->GetMinimum() + delta[1]);
    yAxis->SetMaximum(yAxis->GetMaximum() + delta[1]);

    // Mark the scene as dirty
    this->Scene->SetDirty(true);

    // ComputeViewTransform is called through Superclass::Paint
    this->InvokeEvent(vtkCommand::InteractionEvent);
    return true;
  }

  return false;
}

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bool vtkInteractiveArea::MouseButtonPressEvent(const vtkContextMouseEvent& mouse)