[vtkusers] QVTK issue with vtkImageViewer2

[Clinton Stimpson]

A quick glance at the code shows you're not hooking up the QVTKWIdget with the 
vtkImageViewer2 correctly.

One way to do it:
vtkwidget = new QVTKWidget(centralwidget);
imgview->SetupInteractor(vtkwidget->GetInteractor());
imgview->SetRenderWindow(vtkwidget->GetRenderWindow());

Clint

On Friday 20 November 2009 11:21:27 am Ashish Singh wrote:
> any suggestions on this?
>
> ---------- Forwarded message ----------
> From: Ashish Singh <asinghmlists at gmail.com>
> Date: Thu, Nov 19, 2009 at 10:59 AM
> Subject: QVTK issue with vtkImageViewer2
> To: vtkusers at vtk.org
>
>
> Hi,
>
> I am trying to display each slice from a series of CT scans in a
> QVTKwidget. The QVTKWidget itself is in a QMainWindow with 3 other widgets
> to browse, load and unload the data. I want to be able to display the data
> in QVTKwidget as soon as I hit the load button. I also want to be able to
> unload the data and clear the QVTKwidget as soon as I hit the unload button
> so that I can load a new dataset afterwards.
>
> I can read and display the data fine only the first time. I can also unload
> the data, but after unload when I try to load new data it doesn't show up
> in my QVTKwidget. Can anyone please tell me what am I missing or doing
> wrong here and how to correct it?
>
> My development environment is:
> Windows XP Pro x64
> Visual Studio 2005
> VTK 5.4.2
> Qt 4.5.0
>
> Thanks,
> Ashish
>
> Here's the code that I use:
> ----Header file: test.h-----
> #include <QObject>
> #include <QPushButton>
> #include <QLabel>
> #include <QHBoxLayout>
> #include <QVBoxLayout>
> #include <QMainWindow>
> #include <QVTKWidget.h>
> #include <QWidget>
> #include <QString>
> #include <QFileDialog>
> #include <QDir>
> #include <qapplication.h>
> #include <qobject.h>
> #include <QtGui>
>
> #include <vtkDICOMImageReader.h>
> #include <vtkImageViewer2.h>
> #include <vtkRenderWindow.h>
> #include "vtkRenderer.h"
> #include "vtkCornerAnnotation.h"
> #include "vtkImageData.h"
>
>
> using namespace std;
>
> class test : public QObject
> {
>     Q_OBJECT
>
> public:
>     string dirname;
>     vtkDICOMImageReader *reader;
>     vtkImageViewer2 *imgview;
>     vtkImageData *blank;
>
>     QMainWindow *mymainwindow;
>     QWidget *centralwidget;
>     QLabel *mylabel;
>     QPushButton *mypbutton;
>     QPushButton *myloadbutton;
>     QPushButton *myunloadbutton;
>     QVTKWidget *vtkwidget;
>     QHBoxLayout *myhlayout;
>     QVBoxLayout *myvlayout;
>     test(QObject* parent = 0);
>     ~test();
>
>     public slots:
>         void OnLoad();
>         void OnBrowse();
>         void OnUnLoad();
>
> };
>
> -----cpp file: test.cpp-------
> #include "test.h"
>
> test::test(QObject * parent):QObject(parent)
> {
>     reader = vtkDICOMImageReader::New();
>     imgview = vtkImageViewer2::New();
>
>     //create dummy data to create start up blank image
>     blank = vtkImageData::New();
>     blank->SetDimensions(10, 10, 1);
>     blank->AllocateScalars();
>     for (int i = 0; i < 10; i++)
>         for (int j = 0; j < 10; j++)
>             blank->SetScalarComponentFromDouble(i, j, 0, 0, 0);
>     blank->Update();
>     imgview->SetInput(blank);
>     imgview->SetInput(blank);
>     //create dummy data to create start up blank image
>
>     mymainwindow = new QMainWindow();
>     centralwidget = new QWidget(mymainwindow);
>
>     mylabel = new QLabel(centralwidget);
>     mypbutton = new QPushButton(centralwidget);
>     myloadbutton = new QPushButton(centralwidget);
>     myunloadbutton = new QPushButton(centralwidget);
>
>     vtkwidget = new QVTKWidget(centralwidget);
>     vtkwidget->GetRenderWindow()->AddRenderer(imgview->GetRenderer());
>     vtkwidget->setFixedSize(512,512);
>
>     myhlayout = new QHBoxLayout();
>     myvlayout = new QVBoxLayout();
>
>     //setup UI
>     mylabel->setText("Select Dicom Dir");
>     mypbutton->setText("Browse");
>     this->connect(this->mypbutton,SIGNAL(clicked()),this,
> SLOT(OnBrowse()));
>
>     myloadbutton->setText("Load");
>     this->connect(this->myloadbutton,SIGNAL(clicked()),this,
> SLOT(OnLoad()));
>
>     myunloadbutton->setText("Unload");
>
> this->connect(this->myunloadbutton,SIGNAL(clicked()),this,SLOT(OnUnLoad()))
>;
>
>     myhlayout->addWidget(mylabel);
>     myhlayout->addWidget(mypbutton);
>     myhlayout->addWidget(myloadbutton);
>     myhlayout->addWidget(myunloadbutton);
>
>     myvlayout->addLayout(myhlayout);
>     myvlayout->addWidget(vtkwidget);
>
>     centralwidget->setLayout(myvlayout);
>     mymainwindow->setCentralWidget(centralwidget);
>     mymainwindow->show();
> }
>
> test::~test()
> {
>     reader->Delete();
>     imgview->Delete();
>     blank->Delete();
> }
>
> void test::OnLoad()
> {
>     reader->SetDirectoryName(dirname.c_str());
>     reader->Update();
>     imgview->SetInput(reader->GetOutput());
>     imgview->GetRenderer()->ResetCamera();
>     vtkwidget->update();
> }
>
> void test::OnUnLoad()
> {
>     imgview->GetRenderer()->RemoveAllViewProps();
>     imgview->GetRenderer()->ResetCamera();
>     vtkwidget->update();
> }
>
> void test::OnBrowse()
> {
>     QString indirectory =
> QFileDialog::getExistingDirectory(this->centralwidget,tr("Select Input
> Directory"), QDir::currentPath());
>     dirname = indirectory.toStdString();
> }
>
> -----main.cpp---------
> #include "test.h"
> void main(int argc, char *argv[])
> {
>     QApplication app(argc, argv);
>     test *mywin = new test;
>     app.exec();
>
> }