#include "ui_mainwindow.h"
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageToVTKImageFilter.h"
#include <itkGDCMImageIO.h>    //此處使用尖括號更好
#include "itkMetaDataDictionary.h"
#include "itkMetaDataObject.h"
#include "vtkImageViewer2.h"
#include "vtkImageFlip.h"
#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);
using namespace std;
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);    
}
MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::on_OpenFile_triggered()
{
    typedef signed short InputPixelType;
    const unsigned int InputDimension=2;
    typedef itk::Image<InputPixelType,InputDimension> ImageType;
    typedef itk::ImageFileReader<ImageType> ReaderType;
    ReaderType::Pointer reader = ReaderType::New();
    reader->SetFileName("F://1-248.dcm");
    typedef itk::GDCMImageIO ImageIOType;
    ImageIOType::Pointer gdcmImageIO = ImageIOType::New();
    reader->SetImageIO(gdcmImageIO);
    reader->Update();
    std::cout<<"read dicom sucess"<<std::endl;
    //頭文件數據字典
    typedef itk::MetaDataDictionary DictionaryType;
    DictionaryType &dictionary= gdcmImageIO->GetMetaDataDictionary();
    typedef itk::MetaDataObject<std::string> MetaDataStringType;//管理字符串類型
    //從數據字典中可以獲得幾乎所有dicom標簽對應的數值
    DictionaryType::ConstIterator itr=dictionary.Begin();
    DictionaryType::ConstIterator end=dictionary.End();
    while(itr!=end)
    {
        itk::MetaDataObjectBase::Pointer entry=itr->second;
        MetaDataStringType::Pointer entryValue=dynamic_cast<MetaDataStringType *>(entry.GetPointer());
        //dynamic_cast將一個基類對象指針（或引用）cast到繼承類指針 MetaDataStringType::Pointer
        if(entryValue)
        {
            std::string tagKey=itr->first;
            std::string labelId;
            bool found=itk::GDCMImageIO::GetLabelFromTag(tagKey,labelId);
            std::string tagValue = entryValue->GetMetaDataObjectValue();
            if(found)
            {
                std::cout<<"("<<tagKey<<")"<<labelId;
                std::cout<<"="<<tagValue.c_str()<<std::endl;
            }
            else
            {
               std::cout<<"("<<tagKey<<")"<<"unknown";
               std::cout<<"="<<tagValue.c_str()<<std::endl;
            }
            ++itr;
        }
    }
    //獲取醫院的名稱并在qt上顯示。
     std::string tagKey="0008|103e";
     std::string value;
     gdcmImageIO->GetValueFromTag(tagKey,value);
     std::cout<<"value="<<value.c_str()<<std::endl;
     ui->hospital->setText(value.c_str());
    typedef itk::ImageToVTKImageFilter<ImageType> FilterType;
    FilterType::Pointer connector = FilterType::New();
    connector->SetInput(reader->GetOutput());
    connector->Update();        //vtk版本大于5必須加上這句話，否則顯示不出圖片
    vtkImageFlip *flip=vtkImageFlip::New();//由于vtk、itk顯示圖像時y軸相反，此處做一次翻轉
    flip->SetInputData(connector->GetOutput());
    flip->SetFilteredAxis(1);
    flip->Update();
    vtkImageViewer2  *viewer =  vtkImageViewer2::New();
   // vtkRenderWindowInteractor *interactor=vtkRenderWindowInteractor::New();
    viewer->SetInputData(flip->GetOutput());
    viewer->SetColorWindow(1224);
    viewer->SetColorLevel(587);
    viewer->SetRenderWindow(ui->qvtkwidget->GetRenderWindow());
    viewer->Render();
}