Hi,

I have a reimplemented QGLWidget, which I added to a Layout. But it draw from the top-left corner of the window, not in its place in the layout.
My code:
glwidget.h
Qt Code: 
  1. #ifndef GLWIDGET_H
  2. #define GLWIDGET_H
  3.  
  4. #include <QGLWidget>
  5. #include <QtOpenGL>
  6. #include <opencv2/opencv.hpp>
  7. #include <QMutex>
  8. using namespace cv;
  9.  
  10. class GLWidget : public QGLWidget
  11. {
  12.     Q_OBJECT
  13. public:
  14.     GLWidget();
  15.     void sendImage(Mat *img);
  16. protected:
  17.     void initializeGL();
  18.     void paintGL();
  19.     void resizeGL(int width, int height);
  20. private:
  21.     QImage qframe;
  22.     QMutex mutex;
  23.  
  24. };
  25.  
  26. #endif // GLWIDGET_H
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glwidget.cpp
Qt Code: 
  1. #include "glwidget.h"
  2. #include <QMutexLocker>
  3.  
  4. GLWidget::GLWidget() : QGLWidget(QGLFormat(QGL::SampleBuffers)) {
  5.     setMinimumSize(320,240);
  6. }
  7.  
  8. void GLWidget::initializeGL() {
  9.     glClearColor(0.0f,0.0f,0.0f,1.0f);
  10. }
  11. void GLWidget::paintGL() {
  12.     glClear (GL_COLOR_BUFFER_BIT);
  13.     glClearColor (0.0,0.0,0.0,1.0);
  14.     if (!qframe.isNull()) {
  15.         qframe = qframe.scaled(this->size(), Qt::KeepAspectRatio,Qt::SmoothTransformation);
  16.         glDisable(GL_DEPTH_TEST);
  17.         glMatrixMode(GL_PROJECTION);
  18.         glLoadIdentity();
  19.         gluOrtho2D(0,qframe.width(),qframe.height(),0);
  20.         glMatrixMode(GL_MODELVIEW);
  21.         glLoadIdentity();
  22.         glEnable(GL_TEXTURE_2D);
  23.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  24.         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  25.         glTexImage2D( GL_TEXTURE_2D, 0, 4, qframe.width(), qframe.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, qframe.bits() );
  26.         glBegin(GL_QUADS);
  27.         glTexCoord2f(0,0); glVertex2f(0,qframe.height());
  28.         glTexCoord2f(0,1); glVertex2f(0,0);
  29.         glTexCoord2f(1,1); glVertex2f(qframe.width(),0);
  30.         glTexCoord2f(1,0); glVertex2f(qframe.width(),qframe.height());
  31.         glEnd();
  32.         glDisable(GL_TEXTURE_2D);
  33.         glFlush();
  34.     }
  35.     // qDebug() << "Drawing...";
  36. }
  37.  
  38. void GLWidget::resizeGL(int w, int h) {
  39.     glViewport (0, 0, (GLsizei)w, (GLsizei)h);
  40.     glMatrixMode (GL_PROJECTION);
  41.     glLoadIdentity ();
  42.     gluPerspective (60, (GLfloat)w / (GLfloat)h, 1.0, 100.0);
  43.     glMatrixMode (GL_MODELVIEW);
  44.     // qDebug() << "Resizing...";
  45. }
  46.  
  47. void GLWidget::sendImage(Mat* img) {
  48.     QMutexLocker l(&mutex);
  49.     cvtColor(*img, *img, CV_GRAY2RGB);
  50.     imwrite("ki.png", *img);
  51.     qframe = QImage((const unsigned char*)(img->data), img->cols, img->rows, img->step, QImage::Format_RGB888).rgbSwapped();
  52.     qframe = QGLWidget::convertToGLFormat(qframe);
  53.     this->updateGL();
  54. }
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mainwindow.h
Qt Code: 
  1. #ifndef MAINWINDOW_H
  2. #define MAINWINDOW_H
  3.  
  4. #include <QMainWindow>
  5. #include "borderlayout.h"
  6. #include "glwidget.h"
  7. #include "voxel.h"
  8. #include <QToolBar>
  9.  
  10. namespace Ui {
  11.     class MainWindow;
  12. }
  13.  
  14. class MainWindow : public QMainWindow
  15. {
  16.     Q_OBJECT
  17.  
  18. public:
  19.     explicit MainWindow(QWidget *parent = 0);
  20.     ~MainWindow();
  21.  
  22. public slots:
  23.     void refresh(int num);
  24.  
  25. private:
  26.     Ui::MainWindow *ui;
  27.     BorderLayout *layout;
  28.     QToolBar *leftToolbar;
  29.     QToolBar *rightToolbar;
  30.     QHBoxLayout *centralLayout;
  31.     BorderLayout *leftImage;
  32.     BorderLayout *rightImage;
  33.     GLWidget *rgl;
  34.     GLWidget *lgl;
  35.     QSlider *lslider;
  36.     QSlider *rslider;
  37.     QHBoxLayout *box1;
  38.     QHBoxLayout *box2;
  39.     Voxel left;
  40.     Voxel right;
  41. };
  42.  
  43. #endif // MAINWINDOW_H
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mainwindow.cpp
Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include <QDebug>
  4.  
  5. using namespace cv;
  6.  
  7. MainWindow::MainWindow(QWidget *parent) :
  8.     QMainWindow(parent),
  9.     ui(new Ui::MainWindow)
  10. {
  11.     ui->setupUi(this);
  12.     layout = new BorderLayout;
  13.     leftToolbar = new QToolBar;
  14.     leftToolbar->setOrientation(Qt::Vertical);
  15.     leftToolbar->addAction("Hello");
  16.     rightToolbar = new QToolBar;
  17.     rightToolbar->setOrientation(Qt::Vertical);
  18.     rightToolbar->addAction("Hello");
  19.     rightToolbar->addAction("Heo");
  20.     layout->addWidget(leftToolbar, BorderLayout::West);
  21.     layout->addWidget(rightToolbar, BorderLayout::East);
  22.     centralLayout = new QHBoxLayout();
  23.     rightImage = new BorderLayout();
  24.     leftImage = new BorderLayout();
  25.     lgl = new GLWidget();
  26.     rgl = new GLWidget();
  27.     box1 = new QHBoxLayout();
  28.     box2 = new QHBoxLayout();
  29.     box1->addWidget(lgl);
  30.     box2->addWidget(rgl);
  31.     leftImage->add(box1, BorderLayout::Center);
  32.     rightImage->add(box2, BorderLayout::Center);
  33.     lslider = new QSlider(Qt::Horizontal);
  34.     rslider = new QSlider(Qt::Horizontal);
  35.  
  36.     connect(lslider,SIGNAL(valueChanged(int)),this, SLOT(refresh(int)));
  37.     leftImage->addWidget(lslider,BorderLayout::South);
  38.     rightImage->addWidget(rslider, BorderLayout::South);
  39.     centralLayout->addLayout(leftImage);
  40.     centralLayout->addLayout(rightImage);
  41.     layout->add(centralLayout, BorderLayout::Center);
  42.     ui->centralWidget->setLayout(layout);
  43.     left.beolvas("airjet.hdr");
  44.     lslider->setRange(0,left.numReteg()-1);
  45.     /*for(int i = 0; i<59; i++){
  46.         qDebug() << sum(left[i]).val[0];
  47.     }
  48.     imshow("kep",left[20]);*/
  49. }
  50.  
  51. MainWindow::~MainWindow()
  52. {
  53.     delete ui;
  54.     delete layout;
  55.     delete centralLayout;
  56.     delete leftToolbar;
  57.     delete rightToolbar;
  58.     delete rightImage;
  59.     delete leftImage;
  60.     delete box1;
  61.     delete box2;
  62.     delete lgl;
  63.     delete rgl;
  64.     delete lslider;
  65.     delete rslider;
  66. }
  67.  
  68. void MainWindow::refresh(int n){
  69.     if(sender()==lslider){
  70.         Mat a = left[n];
  71.         lgl->sendImage(&a);
  72.         Mat b = left[n];
  73.         rgl->sendImage(&b);
  74.     }else{
  75.         Mat a = right[n];
  76.         rgl->sendImage(&a);
  77.     }
  78. }
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BorderLayout is come from qt example.

I think these are the relevant code.


I made a screenshot from my window.
The GLWidgets should be above the sliders.
window.png

What's wrong?