[vtkusers] QVTK issue with vtkImageViewer2
Ashish Singh
asinghmlists at gmail.com
Wed Nov 25 12:09:42 EST 2009
Hi Lars,
Thanks a lot. All of the solutions that you suggested worked. Is any one
approach faster than the other?
Thanks again.
Ashish
On Sat, Nov 21, 2009 at 12:46 AM, lars-friedrich <lars-friedrich at gmx.net>wrote:
>
> Hi Ashish,
>
>
> I think I can suggest some possible solutions to your problem with
> vtkImageViewer2-handling:
>
>
> 1. the easiest thing may be to use your 'blank'-image instead of removing
> the view-props of the renderer; I mean, you did already implement it in
> order to overcome the broken pipeline problem vtkImageViewer2 usually
> causes
> at situations when its input is NULL ...; e.g. do this in the unload-slot:
> {
> //imgview->GetRenderer()->RemoveAllViewProps(); // forget about that
> imgview->SetInput(blank); // simply set the blank input again
> imgview->GetRenderer()->ResetCamera();
> vtkwidget->update();
> }
>
>
> 2. the problem with removing the renderer's view props is that
> vtkImageViewer2 does not automatically add the view props again - you must
> either do this (a) manually or (b) re-trigger the internal
> InstallPipeline-method
>
> (a)
> load-slot:
> {
> reader->SetDirectoryName(dirname.c_str());
> reader->Update();
> imgview->SetInput(reader->GetOutput());
> if (!imgview->GetRenderer()->HasViewProp(imgview->GetImageActor())) //
> manually check whether we've to re-add the actor
> imgview->GetRenderer()->AddViewProp(imgview->GetImageActor());
> imgview->GetRenderer()->ResetCamera();
> vtkwidget->update();
> }
> unload-slot:
> {
> //imgview->GetRenderer()->RemoveAllViewProps();
> imgview->GetRenderer()->RemoveViewProp(imgview->GetImageActor()); //
> remove vtkImageViewer's specific actor
> imgview->GetRenderer()->ResetCamera();
> vtkwidget->update();
> }
>
>
> (b)
> load-slot:
> {
> reader->SetDirectoryName(dirname.c_str());
> reader->Update();
> imgview->SetInput(reader->GetOutput());
>
> imgview->SetRenderWindow(NULL); // internal call of UninstallPipeline()
> is for example triggered by re-setting render window ...
> imgview->SetRenderWindow(vtkwidget->GetRenderWindow());
>
> imgview->GetRenderer()->ResetCamera();
> vtkwidget->update();
> }
> unload-slot:
> {
> //imgview->GetRenderer()->RemoveAllViewProps();
> imgview->GetRenderer()->RemoveViewProp(imgview->GetImageActor()); //
> remove vtkImageViewer's specific actor
> imgview->GetRenderer()->ResetCamera();
> vtkwidget->update();
> }
>
>
>
>
> HTH,
>
> lars
>
>
>
>
> Ashish Singh-4 wrote:
> >
> > 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();
> >
> > }
> >
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> >
> >
>
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>
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>
> Visit other Kitware open-source projects at
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>
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