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   源码介绍

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#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkLineWidget2.h>
#include <vtkLineRepresentation.h>
#include <vtkCommand.h>
#include <vtkEllipseArcSource.h>
#include <vtkRendererCollection.h>
#include <vtkActorCollection.h>
#include <vtkTextWidget.h>
#include <vtkTextActor.h>
#include <vtkAnnotation.h>
#include <vtkAnnotatedCubeActor.h>
#include <vtkInformation.h>
#include <vtkVectorText.h>
#include <vtktextmapper.h>
#include <vtkProperty.h>
#include <vtkFollower.h>
#include <vtkCamera.h>
#include <vtkInteractorObserver.h>
#include <vtkAxesActor.h>
#include <vtkDistanceWidget.h>
#include <vtkDistanceRepresentation.h>

class vtkLineCallback : public vtkCommand
{
  public:
    static vtkLineCallback *New()
    {
      return new vtkLineCallback;
    }

	void setProperty(vtkSmartPointer<vtkVectorText> vectorText, vtkSmartPointer<vtkFollower> actor, vtkSmartPointer<vtkEllipseArcSource> ellipse)
	{
		this->vectorText = vectorText;
		this->actor = actor;
		this->ellipse = ellipse;
	}

    virtual void Execute(vtkObject *caller, unsigned long eventID, void*)
    {
		vtkLineWidget2 *lineWidget = reinterpret_cast<vtkLineWidget2*>(caller);

		char text[200];
		sprintf(text, "%.2f mm", lineWidget->GetLineRepresentation()->GetDistance());
		vtkNew<vtkPolyData> polydata;
		lineWidget->GetLineRepresentation()->GetPolyData (polydata);
		
		double pA[3], pB[3];
		int num;
		vtkPoints* points = polydata->GetPoints();
		polydata->GetPoint(0, pA);
		polydata->GetPoint(num = points->GetNumberOfPoints() - 1, pB);
		std::cout<< "PA: " << setiosflags(ios::fixed) << setprecision(6) << pA[0] << " " << pA[1] << " " << pA[2] << "\t\t"
			<< "PB: " << pB[0] << " " << pB[1] << " " << pB[2] << std::endl;

		double majorRadius[3] = { (pB[0] - pA[0]) / 2, (pB[1] - pA[1]) / 2, (pB[2] - pA[2]) / 2 };
		double pCenter[3] = { (pA[0]   pB[0]) / 2, (pA[1]   pB[1]) / 2, (pA[2]   pB[2]) / 2 };
		double Length =  std::sqrt(std::pow((pB[0] - pA[0]), 2)   std::pow((pB[1] - pA[1]), 2)   std::pow((pB[2] - pA[2]), 2));
		double pDisplay[3];

		vectorText->SetText(text);
		//actor->SetOrientation(lineWidget->GetRepresentation()->GetRenderer()->GetActiveCamera()->GetDirectionOfProjection());
		actor->SetPosition(pCenter);
		actor->SetScale(Length / 10);

		//Update everytime when trigger this event.
		//This normal setting would ensure the ellipse alwarys dispaly in 2D when updating.
		//ellipse->SetNormal(lineWidget->GetRepresentation()->GetRenderer()->GetActiveCamera()->GetDirectionOfProjection());
		ellipse->SetCenter(pCenter);
		ellipse->SetMajorRadiusVector(majorRadius);
    }
	vtkSmartPointer<vtkVectorText> vectorText = nullptr;
	vtkSmartPointer<vtkActor> actor = nullptr;
	vtkSmartPointer<vtkEllipseArcSource> ellipse = nullptr;
};
 
int main(int, char *[])
{
	/*/////////////////////////////////////////////////////////////////////////
	Basic rendering settings
	/////////////////////////////////////////////////////////////////////////*/
	vtkNew<vtkRenderer> renderer;
	vtkNew<vtkRenderWindow> renderWindow;
	vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
	renderWindow->SetSize(600, 400);
	renderWindow->AddRenderer(renderer);
	renderWindowInteractor->SetRenderWindow(renderWindow);

	/*/////////////////////////////////////////////////////////////////////////
	vtkLineWidget2
	/////////////////////////////////////////////////////////////////////////*/
	vtkNew<vtkLineWidget2> lineWidget;
	lineWidget->CreateDefaultRepresentation();
	double pStart[3] = { 0, 0, 0 }, pEnd[3] = { 1, 1, 1 };
	lineWidget->GetLineRepresentation()->SetPoint1DisplayPosition(pStart); //SetPoint1WorldPosition
	lineWidget->GetLineRepresentation()->SetPoint1DisplayPosition(pEnd);
	lineWidget->SetInteractor(renderWindowInteractor);

	/*/////////////////////////////////////////////////////////////////////////
	vtkEllipseArcSource
	/////////////////////////////////////////////////////////////////////////*/
	vtkNew<vtkEllipseArcSource> ellipse;
	vtkNew<vtkPolyDataMapper> mapperText;
	mapperText->SetInputConnection(ellipse->GetOutputPort());
	vtkNew<vtkActor> ellipseActor;
	ellipseActor->SetMapper(mapperText);
	ellipse->SetSegmentAngle(360);
	ellipse->SetRatio(0.5);
	ellipse->SetNormal(renderer->GetActiveCamera()->GetDirectionOfProjection());
	double lineStart[3], lineEnd[3];
	lineWidget->GetLineRepresentation()->GetPoint1WorldPosition(lineStart);
	lineWidget->GetLineRepresentation()->GetPoint2WorldPosition(lineEnd);
	double pCenter[3] = { (lineEnd[0]   lineStart[0]) / 2,(lineEnd[1]   lineStart[1]) / 2, (lineEnd[2]   lineStart[2]) / 2 };
	ellipse->SetCenter(pCenter);
	double vMajorRadius[3] = { (lineEnd[0] - lineStart[0]) / 2,(lineEnd[1] - lineStart[1]) / 2, (lineEnd[2] - lineStart[2]) / 2};
	ellipse->SetMajorRadiusVector(vMajorRadius);
	renderer->AddActor(ellipseActor);

	/*/////////////////////////////////////////////////////////////////////////
	vtkVectorText
	/////////////////////////////////////////////////////////////////////////*/
	vtkNew<vtkVectorText> vectorText;
	vtkNew<vtkPolyDataMapper> txtMapper;
	vtkNew <vtkFollower> textActor;
	char text[200];
	double distance = lineWidget->GetLineRepresentation()->GetDistance();
	sprintf(text, "%.2f mm", distance);
	vectorText->SetText(text);
	textActor->SetScale(distance / 10);
	textActor->SetCamera(renderer->GetActiveCamera());
	txtMapper->SetInputConnection(vectorText->GetOutputPort());
	textActor->SetMapper(txtMapper);
	renderer->AddActor(textActor);

	/*/////////////////////////////////////////////////////////////////////////
	vtkLineCallback
	/////////////////////////////////////////////////////////////////////////*/
	vtkNew<vtkLineCallback> lineCallback;
	lineCallback->setProperty(vectorText, textActor, ellipse);
	lineWidget->AddObserver(vtkCommand::InteractionEvent, lineCallback);
	lineWidget->On();

	/*/////////////////////////////////////////////////////////////////////////
	vtkAxesActor
	/////////////////////////////////////////////////////////////////////////*/
	vtkNew<vtkAxesActor> oriAxesActor;
	oriAxesActor->SetPosition(pCenter);
	oriAxesActor->SetTotalLength(distance / 3 , distance / 3, distance / 3);
	oriAxesActor->SetShaftType(0);
	oriAxesActor->SetAxisLabels(1);
	oriAxesActor->SetConeRadius(distance / 5);
	oriAxesActor->SetCylinderRadius(distance / 50);
	renderer->AddActor(oriAxesActor);

	/*/////////////////////////////////////////////////////////////////////////
	Initial component about rendering
	/////////////////////////////////////////////////////////////////////////*/
	renderWindow->Render();
	renderWindowInteractor->Initialize();
	renderWindow->Render();
	renderWindowInteractor->Start();

	return EXIT_SUCCESS;
}