一、vtk中的vtkImageData

VTK提供相对应的类对图像文件进行读写操作

 测试下效果：

int main()
{
	//vtkSmartPointer<vtkBMPReader> reader = vtkSmartPointer<vtkBMPReader>::New();
	//reader->SetFileName("**\\12.bmp");
	vtkSmartPointer<vtkPNGReader> reader = vtkSmartPointer<vtkPNGReader>::New();
	reader->SetFileName("**\\123.png");
	reader->Update();

	//注意vtkImageActor接收到的图像vtkImageData必须是unsigned char类型的
	vtkSmartPointer<vtkImageActor> imageActor = vtkSmartPointer<vtkImageActor>::New();
	imageActor->SetInputData(reader->GetOutput());

	vtkSmartPointer<vtkRenderer> render = vtkSmartPointer<vtkRenderer>::New();
	render->AddActor(imageActor);
	render->ResetCamera();
	render->SetBackground(0, 0, 0);

	vtkSmartPointer<vtkRenderWindow> window = vtkSmartPointer<vtkRenderWindow>::New();
	window->AddRenderer(render);
	window->SetSize(640, 480);
	window->SetWindowName("3DViewer");
	window->Render();

	vtkSmartPointer<vtkRenderWindowInteractor> interactor =vtkSmartPointer<vtkRenderWindowInteractor>::New();
	vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New();
	interactor->SetInteractorStyle(style);
	interactor->SetRenderWindow(window);
	interactor->Initialize();

	interactor->Start();

	return 0;
}

看下效果：

可以实现鼠标左键按下，移动，鼠标中键移动效果，鼠标右键放大缩小

二、vtkImageViewer2

vtkImageViewer2是一个方便易用的2D图像显示类，它封装了vtkRenderWindow, vtkRender, vtkImageActor和vtkImageMapToWinowLevelColors。同时，包含了一个vtkInteractorStyleImage的交互方式，使得显示和交互变得更加简单。具体使用如下：

    vtkSmartPointer<vtkImageViewer2> viewer2 = vtkSmartPointer<vtkImageViewer2>::New();
	viewer2->SetInputConnection(reader->GetOutputPort());
	vtkSmartPointer<vtkRenderWindowInteractor> interactor =vtkSmartPointer<vtkRenderWindowInteractor>::New();
	//默认选择第50张切片
	viewer2->SetSlice(50);
	//显示方向
	viewer2->SetSliceOrientationToXY();
	//加入交互
	viewer2->SetupInteractor(interactor);
	viewer2->Render();
	interactor->Start();
	return 0;