mitk源码分析系列一

数据类

BaseData->SlicedData->Image

void mitk::DisplayActionEventBroadcast::StartRotation(StateMachineAction* /*stateMachineAction*/, InteractionEvent* /*interactionEvent*/)
{
  SetMouseCursor(rotate_cursor_xpm, 0, 0);
}

void mitk::DisplayActionEventBroadcast::EndRotation(StateMachineAction* /*stateMachineAction*/, InteractionEvent* /*interactionEvent*/)
{
  ResetMouseCursor();
}

斜切部分核心代码

void mitk::DisplayActionEventBroadcast::Rotate(StateMachineAction* /*stateMachineAction*/, InteractionEvent* interactionEvent)
{
  const auto* positionEvent = dynamic_cast<InteractionPositionEvent*>(interactionEvent);
  if (nullptr == positionEvent)
  {
    return;
  }

  Point3D position = positionEvent->GetPositionInWorld();

  Vector3D toProjected = m_LastCursorPosition - m_CenterOfRotation;
  Vector3D toCursor = position - m_CenterOfRotation;

  // cross product: | A x B | = |A| * |B| * sin(angle)
  Vector3D axisOfRotation;
  vnl_vector_fixed<ScalarType, 3> vnlDirection = vnl_cross_3d(toCursor.GetVnlVector(), toProjected.GetVnlVector());
  axisOfRotation.SetVnlVector(vnlDirection);

  // scalar product: A * B = |A| * |B| * cos(angle)
  // tan = sin / cos
  ScalarType angle = -atan2((double)(axisOfRotation.GetNorm()), (double)(toCursor * toProjected));
  angle *= 180.0 / vnl_math::pi;
  m_LastCursorPosition = position;

  // create RotationOperation and apply to all SNCs that should be rotated
  RotationOperation rotationOperation(OpROTATE, m_CenterOfRotation, axisOfRotation, angle);

  // iterate the OTHER slice navigation controllers
  for (auto iter = m_SNCsToBeRotated.begin(); iter != m_SNCsToBeRotated.end(); ++iter)
  {
    TimeGeometry* timeGeometry = (*iter)->GetCreatedWorldGeometry();
    if (nullptr == timeGeometry)
    {
      continue;
    }

    timeGeometry->ExecuteOperation(&rotationOperation);

    (*iter)->SendCreatedWorldGeometryUpdate();
  }

  RenderingManager::GetInstance()->RequestUpdateAll();
}