[vtkusers] QVTKwidget issue

Fri Mar 13 17:36:31 EDT 2009

Thanks Clint. I am resending this message because the previous message
didn't get posted to the list.

vtkRenderWindow::Render() opens up the image in a new window and not in
QVTKWidget. QVTKWidget::update() from OnLoad() works fine.

There is one more issue with the same code. Even before I select the
directory containing CT images, I get a vtkOutputWindow with many errors as
below.

Do you know what may be the cause of these? How do I fix these errors?

Thanks,
Ashish

------------
ERROR: In ..\..\vtk-5.2.1sources\Rendering\vtkImageActor.cxx, line 267
vtkOpenGLImageActor (05E9B1C0): This filter requires unsigned char scalars
as input

ERROR: In ..\..\vtk-5.2.1sources\Filtering\vtkDemandDrivenPipeline.cxx, line
725
vtkStreamingDemandDrivenPipeline (05E9C998): Input port 0 of algorithm
vtkImageMapToWindowLevelColors(05E9B7F8) has 0 connections but is not
optional.

ERROR: In ..\..\vtk-5.2.1sources\Rendering\vtkImageActor.cxx, line 267
vtkOpenGLImageActor (05E9B1C0): This filter requires unsigned char scalars
as input

ERROR: In ..\..\vtk-5.2.1sources\Filtering\vtkDemandDrivenPipeline.cxx, line
725
vtkStreamingDemandDrivenPipeline (05E9C998): Input port 0 of algorithm
vtkImageMapToWindowLevelColors(05E9B7F8) has 0 connections but is not
optional.

ERROR: In ..\..\vtk-5.2.1sources\Rendering\vtkImageActor.cxx, line 267
vtkOpenGLImageActor (05E9B1C0): This filter requires unsigned char scalars
as input

ERROR: In ..\..\vtk-5.2.1sources\Filtering\vtkDemandDrivenPipeline.cxx, line
725
vtkStreamingDemandDrivenPipeline (05E9C998): Input port 0 of algorithm
vtkImageMapToWindowLevelColors(05E9B7F8) has 0 connections but is not
optional.
------------------

On Fri, Mar 13, 2009 at 3:57 PM, Clinton Stimpson <clinton at elemtech.com>wrote:

>
> You need to update the view when you change the data.
> You can add a call to  vtkRenderWindow::Render() or preferably a call to
> QVTKWidget::update() in your OnLoad().
>
> Clint
>
> Ashish Singh 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 2 other widgets
>> to browse and load the data. I want to be able to display the data in
>> QVTKwidget as soon as I hit the load button. I can read the data fine, but
>> it doesn't display in QVTKwidget until I click or interact with QVTKwidget
>> using mouse. Can anyone please tell me what am I missing here?
>>
>> I am working on a Windows system and using VTK version 5.2.1 with Visual
>> Studio 2005 and Qt 4.5
>>
>> Thanks,
>> Ashish
>>
>> Here's my code:
>> ------header file----
>> #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"
>>
>> using namespace std;
>>
>> class test : public QObject
>> {
>>    Q_OBJECT
>>
>> public:
>>    string dirname;
>>    vtkDICOMImageReader *reader;
>>    vtkImageViewer2 *imgview;
>>
>>    QMainWindow *mymainwindow;
>>    QWidget *centralwidget;
>>    QLabel *mylabel;
>>    QPushButton *mypbutton;
>>    QPushButton *myloadbutton;
>>    QVTKWidget *vtkwidget;
>>    QHBoxLayout *myhlayout;
>>    QVBoxLayout *myvlayout;
>>    test(QObject* parent = 0);
>>    ~test();
>>
>>
>>    public slots:
>>        void OnLoad();
>>        void OnBrowse();
>>
>> };
>> ------cpp file------
>> #include "test.h"
>> test::test(QObject * parent):QObject(parent)
>> {
>>    reader = vtkDICOMImageReader::New();
>>    imgview = vtkImageViewer2::New();
>>
>>    mymainwindow = new QMainWindow();
>>    centralwidget = new QWidget(mymainwindow);
>>
>>    mylabel = new QLabel(centralwidget);
>>    mypbutton = new QPushButton(centralwidget);
>>    myloadbutton = 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->mypbutton,SIGNAL(clicked()),this, SLOT(OnLoad()));
>>
>>    myhlayout->addWidget(mylabel);
>>    myhlayout->addWidget(mypbutton);
>>    myhlayout->addWidget(myloadbutton);
>>
>>    myvlayout->addLayout(myhlayout);
>>    myvlayout->addWidget(vtkwidget);
>>
>>    centralwidget->setLayout(myvlayout);
>>    mymainwindow->setCentralWidget(centralwidget);
>>    mymainwindow->show();
>> }
>>
>> test::~test()
>> {
>>    reader->Delete();
>>    imgview->Delete();
>> }
>>
>> void test::OnLoad()
>> {
>>    reader->SetDirectoryName("D:\\testimages\\dicomset\\test");
>>    reader->Update();
>>
>>    imgview->SetInput(reader->GetOutput());
>>    imgview->GetRenderer()->ResetCamera();
>>
>> }
>>
>> 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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