[vtkusers] QVTK issue with vtkImageViewer2
Lars Friedrich Lars
lars-friedrich at gmx.net
Wed Nov 25 14:40:32 EST 2009
hello ashish,
... your welcome.
I do not really believe that one of the approaches is significantly faster than the others. For reasons of simplicity, I would take solution 1. This has the advantage that the typical VTK-warnings ('no input to pipeline ...') are suppressed when there is no input (as far as I can remember). It's just important that you use vtkSmartPointers or ensure that Delete() had been invoked when you disconnect the images to guarantee that the (data set) memory is really released.
regards,
lars
-------- Original-Nachricht --------
> Datum: Wed, 25 Nov 2009 11:09:42 -0600
> Von: Ashish Singh <asinghmlists at gmail.com>
> An: lars-friedrich <lars-friedrich at gmx.net>, vtkusers at vtk.org
> Betreff: Re: [vtkusers] QVTK issue with vtkImageViewer2
> 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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> >
> > --
> > View this message in context:
> >
> http://old.nabble.com/QVTK-issue-with-vtkImageViewer2-tp26429989p26454127.html
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> >
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> >
> > Visit other Kitware open-source projects at
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> >
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> >
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