VTK 实例21：BMP图像信息的访问（图像维数、原点坐标和像素间隔）

#include "vtkAutoInit.h" 
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);

#include <vtkSmartPointer.h>
#include <vtkImageViewer2.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkImageReader2Factory.h>
#include <vtkImageReader2.h>
#include <vtkBMPReader.h>
#include <vtkImageData.h>

//测试图像：../data/lena.bmp
int main(int argc, char* argv[])
{
    /*if (argc < 2)
    {
        std::cout<<argv[0]<<" "<<"ImageFile(*.bmp)"<<std::endl;
        return EXIT_FAILURE;
    }*/
    vtkSmartPointer<vtkBMPReader> reader =
        vtkSmartPointer<vtkBMPReader>::New();
    //reader->SetFileName ( argv[1] );
    reader->SetFileName("1234.bmp");//读取图片
    reader->Update();

    int dims[3];
    reader->GetOutput()->GetDimensions(dims);
    std::cout<<"图像维数:" <<dims[0]<<" "<<dims[1]<<" "<<dims[2]<<std::endl;

    double origin[3];
    reader->GetOutput()->GetOrigin(origin);
    std::cout<<"图像原点:" <<origin[0]<<" "<<origin[1]<<" "<<origin[2]<<std::endl;

    double spaceing[3];
    reader->GetOutput()->GetSpacing(spaceing);
    std::cout<<"像素间隔:" <<spaceing[0]<<" "<<spaceing[1]<<" "<<spaceing[2]<<std::endl;

    vtkSmartPointer<vtkImageViewer2> imageViewer =
        vtkSmartPointer<vtkImageViewer2>::New();
    imageViewer->SetInputConnection(reader->GetOutputPort());

    vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
    imageViewer->SetupInteractor(renderWindowInteractor);
    imageViewer->Render();
    imageViewer->GetRenderer()->ResetCamera();
    imageViewer->Render();

    imageViewer->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
    imageViewer->SetSize(640, 480);
    imageViewer->GetRenderWindow()->SetWindowName("GetImageInformationExample");

    renderWindowInteractor->Start();

    return EXIT_SUCCESS;
}