BestMPRBaseVtk-013-myVtkInteractorStyleImage交互样式

Posted 2022-02-01 DreamLife.

BestMPRBaseVtk myVtkInteractorStyleImage交互样式

​ myVtkInteractorStyleImage继承自vtkInteractorStyleImage，将重写部分鼠标事件和将部分数据传输给外部，形成信号发送出去。

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文章目录

• BestMPRBaseVtk myVtkInteractorStyleImage交互样式
• • 1 重写鼠标滚轮事件，实现鼠标滚轮切换Slice
  • ☞ 源码

关键字： Style、InteractorStyle、Interactor、vtk、交互

1 重写鼠标滚轮事件，实现鼠标滚轮切换Slice

​ 在vtkInteractorStyleImage中没有找到对应的接口。vtkInteractorStyleImage继承自vtkInteractorStyleTrackballCamera,在vtkInteractorStyleTrackballCamera中有与鼠标滚轮相关的接口。如下：

  void OnMouseWheelForward() override;
  void OnMouseWheelBackward() override;

官方的代码实现如下，默认鼠标滚轮为放大缩小。

//----------------------------------------------------------------------------
void vtkInteractorStyleTrackballCamera::OnMouseWheelForward()

  this->FindPokedRenderer(
    this->Interactor->GetEventPosition()[0], this->Interactor->GetEventPosition()[1]);
  if (this->CurrentRenderer == nullptr)
  
    return;
  

  this->GrabFocus(this->EventCallbackCommand);
  this->StartDolly();
  double factor = this->MotionFactor * 0.2 * this->MouseWheelMotionFactor;
  this->Dolly(pow(1.1, factor));
  this->EndDolly();
  this->ReleaseFocus();


//----------------------------------------------------------------------------
void vtkInteractorStyleTrackballCamera::OnMouseWheelBackward()

  this->FindPokedRenderer(
    this->Interactor->GetEventPosition()[0], this->Interactor->GetEventPosition()[1]);
  if (this->CurrentRenderer == nullptr)
  
    return;
  

  this->GrabFocus(this->EventCallbackCommand);
  this->StartDolly();
  double factor = this->MotionFactor * -0.2 * this->MouseWheelMotionFactor;
  this->Dolly(pow(1.1, factor));
  this->EndDolly();
  this->ReleaseFocus();

改写以下：

/**
 * @brief myVtkInteractorStyleImage::OnMouseWheelForward
 * 鼠标滚轮向前滚动
 * 切换图层显示
 */
void myVtkInteractorStyleImage::OnMouseWheelForward()

    int maxSlice = this->ImageViewer->getSliceMax();
    int currentSlice = this->ImageViewer->getSlice();
    if(currentSlice < maxSlice)
    
        currentSlice += 1;
        this->ImageViewer->setSlice(currentSlice);
        this->ImageViewer->render();
        bppWidget->emitSliceChangedSignal(currentSlice);
    

/**
 * @brief myVtkInteractorStyleImage::OnMouseWheelBackward
 * 鼠标滚轮向后滚动
 * 切换图层显示
 */
void myVtkInteractorStyleImage::OnMouseWheelBackward()

    int minSlice = this->ImageViewer->getSliceMin();
    int currentSlice = this->ImageViewer->getSlice();
    if(currentSlice > minSlice)
    
        currentSlice -= 1;
        this->ImageViewer->setSlice(currentSlice);
        this->ImageViewer->render();
        bppWidget->emitSliceChangedSignal(currentSlice);
    

其他的事件也稍作了修改，可以看源码内容。

☞ 源码

源码链接：GitHub仓库自取

使用方法：☟☟☟

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