[VTK] Tracking ImageActor2D

1. 개요

Target이 되는 Actor 을 지정하고 이를 Interaction 에 따라 변경되는 위치를 추적하여 따라다니는 Tracking 2D Actor를 구현한다.

 

2. Tracking Image Actor2D 

vtkImageMapper 에 할당된 이미지를 vtkActor2D 에 입력하고 Tracking을 위한 Interaction event 를 입력한다.

public void TestTrackingImageActor2D()
{
    EnableDrawAxes = true;
    AxesLength = 15;

    var filePath = Path.Combine(DirPath, "reconnect.png");
    var imgData = VtkImageUtils.ReadImageData(filePath);

    vtkRenderer overlayRenderer = vtkRenderer.New();
    renderWindow.AddRenderer(overlayRenderer);
    renderWindow.SetNumberOfLayers(2);

    renderer.SetLayer(0);
    overlayRenderer.SetLayer(1);

    overlayRenderer.InteractiveOff();
    renderer.InteractiveOn();

    vtkImageMapper imgMapper = vtkImageMapper.New();
    imgMapper.SetInputData(imgData);
    imgMapper.SetColorLevel(127.5);
    imgMapper.SetColorWindow(255);

    vtkActor2D trackingActor = vtkActor2D.New();
    trackingActor.SetMapper(imgMapper);
    trackingActor.SetPosition(10, 10);

    // Tracking actor 를 overlay Renderer 에 표시한다.
    overlayRenderer.AddActor2D(trackingActor);

    // Target 이되는 actor이다.
    var cube = VtkGeometryUtils.MakeCubeSource();
    var cubeMapper = vtkPolyDataMapper.New();
    cubeMapper.SetInputData(cube.GetOutput());

    var targetActor = vtkActor.New();
    targetActor.SetMapper(cubeMapper);
    targetActor.GetProperty().SetColor(VtkColorUtils.GetNamedColor3dPtr("SkyBlue"));

    renderer.AddActor(targetActor);

    void OnInteractorOnInteractionEvt(vtkObject sender, vtkObjectEventArgs args)
    {
        var targetPos = targetActor.GetPosition();
        worldCoordinate.SetValue(targetPos.ToIntPtr());
        var scrPos = worldCoordinate.GetComputedDisplayValue(renderer);

        // Tracking Actor가 표시될 delta 위치 값을 설정한다.
        var scrPosTrl = scrPos.Add(new[] { 10, 10 });

        trackingActor.SetPosition(scrPosTrl[0], scrPosTrl[1]);
    }


    // 이벤트 등록 및 제거
    interactor.InteractionEvt += OnInteractorOnInteractionEvt;
    interactor.StartInteractionEvt += OnInteractorOnInteractionEvt;
    interactor.EndInteractionEvt += OnInteractorOnInteractionEvt;
    interactor.MouseWheelForwardEvt += OnInteractorOnInteractionEvt;
    interactor.MouseWheelBackwardEvt += OnInteractorOnInteractionEvt;

    closingEvt += (sender, args) =>
    {
        interactor.InteractionEvt -= OnInteractorOnInteractionEvt;
        interactor.StartInteractionEvt -= OnInteractorOnInteractionEvt;
        interactor.EndInteractionEvt -= OnInteractorOnInteractionEvt;
        interactor.MouseWheelForwardEvt -= OnInteractorOnInteractionEvt;
        interactor.MouseWheelBackwardEvt -= OnInteractorOnInteractionEvt;
    };
}

3. Tracking Text Actor2D

위의 구현에서 TextActor로 변경하고 Interaction 에 따라 TextMapper의 SetInput을 업데이트하는 것 이외에는 모두 동일한다.

public void TestTrackingTextActor2D()
{
    EnableDrawAxes = true;
    AxesLength = 15;

    var filePath = Path.Combine(DirPath, "reconnect.png");
    var imgData = VtkImageUtils.ReadImageData(filePath);

    vtkRenderer overlayRenderer = vtkRenderer.New();
    renderWindow.AddRenderer(overlayRenderer);
    renderWindow.SetNumberOfLayers(2);

    renderer.SetLayer(0);
    overlayRenderer.SetLayer(1);

    overlayRenderer.InteractiveOff();
    renderer.InteractiveOn();

    vtkTextProperty sliceTextProp = vtkTextProperty.New();
    sliceTextProp.SetColor(VtkColorUtils.GetNamedColor3d("Blue").ToIntPtr());
    sliceTextProp.SetFontFamilyToCourier();
    sliceTextProp.SetFontSize(20);
    sliceTextProp.SetVerticalJustificationToBottom();
    sliceTextProp.SetJustificationToLeft();


    vtkTextMapper textMapper = vtkTextMapper.New();
    textMapper.SetInput("Readty to move");
    textMapper.SetTextProperty(sliceTextProp);

    vtkActor2D trackingActor = vtkActor2D.New();
    trackingActor.SetMapper(textMapper);
    trackingActor.SetPosition(15, 10);

    // Tracking actor 를 overlay Renderer 에 표시한다.
    overlayRenderer.AddActor2D(trackingActor);

    // Target 이되는 actor이다.
    var cube = VtkGeometryUtils.MakeCubeSource();
    var cubeMapper = vtkPolyDataMapper.New();
    cubeMapper.SetInputData(cube.GetOutput());

    var targetActor = vtkActor.New();
    targetActor.SetMapper(cubeMapper);
    targetActor.GetProperty().SetColor(VtkColorUtils.GetNamedColor3dPtr("SkyBlue"));

    renderer.AddActor(targetActor);

    void OnInteractorOnInteractionEvt(vtkObject sender, vtkObjectEventArgs args)
    {
        var targetPos = targetActor.GetPosition();
        worldCoordinate.SetValue(targetPos.ToIntPtr());
        var scrPos = worldCoordinate.GetComputedDisplayValue(renderer);

        textMapper.SetInput($"Tracking : {scrPos.ToStringJoin()}");
        // Tracking Actor가 표시될 delta 위치 값을 설정한다.
        var scrPosTrl = scrPos.Add(new[] { 10, 10 });

        trackingActor.SetPosition(scrPosTrl[0], scrPosTrl[1]);
    }


    // 이벤트 등록 및 제거
    interactor.InteractionEvt += OnInteractorOnInteractionEvt;
    interactor.StartInteractionEvt += OnInteractorOnInteractionEvt;
    interactor.EndInteractionEvt += OnInteractorOnInteractionEvt;
    interactor.MouseWheelForwardEvt += OnInteractorOnInteractionEvt;
    interactor.MouseWheelBackwardEvt += OnInteractorOnInteractionEvt;

    closingEvt += (sender, args) =>
    {
        interactor.InteractionEvt -= OnInteractorOnInteractionEvt;
        interactor.StartInteractionEvt -= OnInteractorOnInteractionEvt;
        interactor.EndInteractionEvt -= OnInteractorOnInteractionEvt;
        interactor.MouseWheelForwardEvt -= OnInteractorOnInteractionEvt;
        interactor.MouseWheelBackwardEvt -= OnInteractorOnInteractionEvt;
    };
}