VTK_Learning_交互部件_标注类Widget的应用

傷城~ 2023-07-13 15:21 4阅读 0赞

# 1.标注类Widget #

> 在可视化程序中，经常会对某个对象做一些标注说明，比如，在医学图像诊断中，常常会手动标注出被诊断为肿瘤的区域或者其他病变区域，并用文字进行标注。
> 
> VTK中，与标注相关的Widget如下表所示：
> 
> ![20170209191102095][]
> 
>  *   vtkTextWidget:在渲染场景中生成一串标识文本，可以随意调整该文本在渲染场景中的位置，缩放其大小等。
>  *  vtkScalarBarWidget:根据输入的数据在渲染场景中生成一个标量条，通过设置颜色查找表，可以用标量条上的颜色来指示输入的数据。渲染场景中的标量条可以随意移动、改变大小、设置不同的方向等。
>  *  vtkCaptionWidget:用一个带线框及箭头的文本信息来标注某一对象。
>  *  vtkOrientationMarkerWidget:渲染场景中所渲染数据的方向指示标志。在医学图像领域有广泛的应用，比如，通过CT/MR等扫描的数据，当将其导入可视化应用程序时需要标识其上、下、左、右、前、后等方位。
>  *  vtkBalloonWidget:当鼠标停留在渲染场景中的某个Actor一段时间后，会弹出提示信息。所提示的信息，除了可以用文本表示，也可以用图像表示。  
>

#  2.标注类Widget应用程序 #

>     #include <vtkAutoInit.h>
>     VTK_MODULE_INIT(vtkRenderingOpenGL)
>     VTK_MODULE_INIT(vtkInteractionStyle)
>     VTK_MODULE_INIT(vtkRenderingFreeType)
>      
>     #include <vtkSmartPointer.h>
>     #include <vtkUnstructuredGridReader.h>
>     #include <vtkUnstructuredGrid.h>
>     #include <vtkLookupTable.h>
>     #include <vtkDataSetMapper.h>
>     #include <vtkActor.h>
>     #include <vtkRenderer.h>
>     #include <vtkRenderWindow.h>
>     #include <vtkRenderWindowInteractor.h>
>      
>     #include <vtkScalarBarActor.h>
>     #include <vtkScalarBarWidget.h>
>     #include <vtkTextActor.h>
>     #include <vtkTextWidget.h>
>     #include <vtkTextProperty.h>
>     #include <vtkTextRepresentation.h>
>     #include <vtkAxesActor.h>
>     #include <vtkOrientationMarkerWidget.h>
>     #include <vtkCaptionWidget.h>
>     #include <vtkCaptionActor2D.h>///
>     #include <vtkCaptionRepresentation.h>
>     #include <vtkBalloonWidget.h>
>     #include <vtkBalloonRepresentation.h>
>      
>     int main()
>     {
>     	vtkSmartPointer< vtkUnstructuredGridReader > reader = vtkSmartPointer< vtkUnstructuredGridReader >::New();
>     	reader->SetFileName("data.vtk");
>     	reader->Update();
>      
>     	vtkSmartPointer< vtkLookupTable > lut = vtkSmartPointer< vtkLookupTable >::New();
>     	lut->Build();
>      
>     	vtkSmartPointer< vtkDataSetMapper > mapper = vtkSmartPointer< vtkDataSetMapper >::New();
>     	mapper->SetInputData(reader->GetOutput());
>     	mapper->SetScalarRange(reader->GetOutput()->GetScalarRange());
>     	mapper->SetLookupTable(lut);
>      
>     	vtkSmartPointer< vtkActor > actor = vtkSmartPointer< vtkActor >::New();
>     	actor->SetMapper(mapper);
>      
>     	vtkSmartPointer< vtkRenderer > renderer = vtkSmartPointer< vtkRenderer >::New();
>     	renderer->AddActor(actor);
>     	renderer->SetBackground(1, 1, 1);
>      
>     	vtkSmartPointer< vtkRenderWindow > renderWindow = vtkSmartPointer< vtkRenderWindow >::New();
>     	renderWindow->AddRenderer(renderer);
>     	renderWindow->Render();
>     	renderWindow->SetWindowName("AnnotationWidget");
>     	renderWindow->SetSize(400, 400);
>      
>     	vtkSmartPointer< vtkRenderWindowInteractor > interactor = 
>     		vtkSmartPointer< vtkRenderWindowInteractor >::New();
>     	interactor->SetRenderWindow(renderWindow);
>     /********************************************************************************************/
>     	//标注类测试
>     	 vtkScalarBarWidget
>     	vtkSmartPointer< vtkScalarBarActor > scalarBarActor = vtkSmartPointer< vtkScalarBarActor >::New();
>     	scalarBarActor->SetOrientationToHorizontal();
>     	scalarBarActor->SetLookupTable(lut);
>      
>     	vtkSmartPointer< vtkScalarBarWidget > scalarBarWidget = vtkSmartPointer< vtkScalarBarWidget >::New();
>     	scalarBarWidget->SetInteractor(interactor);
>     	scalarBarWidget->SetScalarBarActor(scalarBarActor);
>     	scalarBarWidget->On();
>      
>     	vtkTextWidget
>     	vtkSmartPointer<vtkTextActor> textActor = vtkSmartPointer<vtkTextActor>::New();
>     	textActor->SetInput("VTK Widgets");
>     	textActor->GetTextProperty()->SetColor(1, 0, 0);
>      
>     	vtkSmartPointer<vtkTextWidget> textWidget = vtkSmartPointer<vtkTextWidget>::New();
>     	textWidget->SetInteractor(interactor);
>     	textWidget->SetTextActor(textActor);
>      
>     	vtkSmartPointer<vtkTextRepresentation>  textRepresentation =
>     		vtkSmartPointer<vtkTextRepresentation>::New();
>     	textRepresentation->GetPositionCoordinate()->SetValue(0.15, 0.15);
>     	textRepresentation->GetPosition2Coordinate()->SetValue(0.7, 0.2);
>      
>     	textWidget->SetRepresentation(textRepresentation);
>     	textWidget->SelectableOff();
>     	textWidget->On();
>      
>     	/ vtkOrientationMarkerWidget
>     	vtkSmartPointer<vtkAxesActor> iconActor = vtkSmartPointer<vtkAxesActor>::New();
>     	vtkSmartPointer<vtkOrientationMarkerWidget> orientationWidget =
>     		vtkSmartPointer<vtkOrientationMarkerWidget>::New();
>     	orientationWidget->SetOutlineColor(0.9300, 0.5700, 0.1300);
>     	orientationWidget->SetInteractor(interactor);
>     	orientationWidget->SetOrientationMarker(iconActor);
>     	orientationWidget->SetViewport(0.0, 0.0, 0.2, 0.2);
>     	orientationWidget->SetEnabled(1);
>     	orientationWidget->InteractiveOn();
>      
>     	 vtkCaptionWidget
>     	//vtkSmartPointer<vtkCaptionWidget> captionWidget = 
>     	//	vtkSmartPointer<vtkCaptionWidget>::New();
>     	//captionWidget->SetInteractor(interactor);
>      
>     	//vtkSmartPointer<vtkCaptionRepresentation> captionRepresentation =
>     	//	vtkSmartPointer<vtkCaptionRepresentation>::New();
>     	//captionRepresentation->GetCaptionActor2D()->SetCaption("Caption Widget");
>     	//captionRepresentation->GetCaptionActor2D()->GetTextActor()->GetTextProperty()->SetFontSize(20);
>     	//
>     	//double pos[3] = { .5, 0, 0 };
>     	//captionRepresentation->SetAnchorPosition(pos);
>     	//captionWidget->SetRepresentation(captionRepresentation);
>     	//captionWidget->On();
>      
>     	/ vtkBalloonWidget
>     	vtkSmartPointer<vtkBalloonWidget> balloonWidget =
>     		vtkSmartPointer<vtkBalloonWidget>::New();
>     	balloonWidget->SetInteractor(interactor);
>      
>     	vtkSmartPointer<vtkBalloonRepresentation> balloonRep =
>     		vtkSmartPointer<vtkBalloonRepresentation>::New();
>     	balloonRep->SetBalloonLayoutToImageRight();
>      
>     	balloonWidget->SetRepresentation(balloonRep);
>     	balloonWidget->AddBalloon(actor, "This is a widget example", NULL);
>     	balloonWidget->On();
>      
>     	renderWindow->Render();
>     	interactor->Initialize();
>     	interactor->Start();
>     	return 0;
>     }
> 
> 输出结果如下：
> 
> ![20170209202727612][]
> 
>  使用标注类Widget需要注意的是，除了指定的Widget表达实体之外，某些Widget还需要与其他Actor协同使用；如上例中的vtkScalarBarWidget要与vtkScalarBarActor协同工作；vtkTextWidget要与vtkTextActor协同工作。

[20170209191102095]: /images/20230529/ce21cedca21941f58cfc31a461f4e314.png
[20170209202727612]: /images/20230529/10193fae071b41ecb639a4497fad4575.png