Putting an opengl widget in to a mainwindow

[bod]

Hello,
I'm trying make a connection between an opengl window and a tree object.
For example there will be a cube, a circle, and a piramid in the openglwidget on the left.
And in the tree there will be nodes: cube, circle and piramid.
When user selects the cube, cube will be higlighted in the graphic.
But I can not even succeed to place the required items on mainwindow.
Could you help me please.
Here is my Header:

#ifndef QTGL_H
#define QTGL_H
 
#include <QtGui/QMainWindow>
#include <QtOpenGL>
#include "ui_qtgl.h"
 
class QtGL : public QMainWindow
{
	Q_OBJECT
 
public:
	QtGL(QWidget *parent = 0, Qt::WFlags flags = 0);
	~QtGL();
	QGLWidget *glwidget;
 
 
protected:
    void initializeGL();
    void resizeGL(int width, int height);
    void paintGL();
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseDoubleClickEvent(QMouseEvent *event);
 
private:
    void draw();
    int faceAtPosition(const QPoint &pos);
 
    GLfloat rotationX;
    GLfloat rotationY;
    GLfloat rotationZ;
    QColor faceColors[4];
    QPoint lastPos;
 
	Ui::QtGLClass ui;
};
 
#endif // QTGL_H

#ifndef QTGL_H
#define QTGL_H

#include <QtGui/QMainWindow>
#include <QtOpenGL>
#include "ui_qtgl.h"

class QtGL : public QMainWindow
{
	Q_OBJECT

public:
	QtGL(QWidget *parent = 0, Qt::WFlags flags = 0);
	~QtGL();
	QGLWidget *glwidget;


protected:
    void initializeGL();
    void resizeGL(int width, int height);
    void paintGL();
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseDoubleClickEvent(QMouseEvent *event);

private:
    void draw();
    int faceAtPosition(const QPoint &pos);

    GLfloat rotationX;
    GLfloat rotationY;
    GLfloat rotationZ;
    QColor faceColors[4];
    QPoint lastPos;

	Ui::QtGLClass ui;
};

#endif // QTGL_H

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and here is my cpp:

#include "qtgl.h"
#include <QtOpenGL>
 
QtGL::QtGL(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	ui.setupUi(this);
	glwidget = new QGLWidget(parent);
 
}
 
QtGL::~QtGL()
{
 
}
 
void QtGL::initializeGL()
{
    glwidget->qglClearColor(Qt::black);
    glShadeModel(GL_FLAT);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);
}
 
void QtGL::resizeGL(int width, int height)
{
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    GLfloat x = GLfloat(width) / height;
    glFrustum(-x, +x, -1.0, +1.0, 4.0, 15.0);
    glMatrixMode(GL_MODELVIEW);
}
 
void QtGL::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    draw();
}
 
void QtGL::draw()
{
    static const GLfloat P1[3] = { 0.0, -1.0, +2.0 };
    static const GLfloat P2[3] = { +1.73205081, -1.0, -1.0 };
    static const GLfloat P3[3] = { -1.73205081, -1.0, -1.0 };
    static const GLfloat P4[3] = { 0.0, +2.0, 0.0 };
 
    static const GLfloat * const coords[4][3] = {
        { P1, P2, P3 }, { P1, P3, P4 }, { P1, P4, P2 }, { P2, P4, P3 }
    };
 
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0.0, 0.0, -10.0);
    glRotatef(rotationX, 1.0, 0.0, 0.0);
    glRotatef(rotationY, 0.0, 1.0, 0.0);
    glRotatef(rotationZ, 0.0, 0.0, 1.0);
 
    for (int i = 0; i < 4; ++i) {
        glLoadName(i);
        glBegin(GL_TRIANGLES);
        glwidget->qglColor(faceColors[i]);
        for (int j = 0; j < 3; ++j) {
            glVertex3f(coords[i][j][0], coords[i][j][1],
                       coords[i][j][2]);
        }
        glEnd();
    }
}
 
void QtGL::mousePressEvent(QMouseEvent *event)
{
    lastPos = event->pos();
}
 
void QtGL::mouseMoveEvent(QMouseEvent *event)
{
    GLfloat dx = GLfloat(event->x() - lastPos.x()) / width();
    GLfloat dy = GLfloat(event->y() - lastPos.y()) / height();
    if (event->buttons() & Qt::LeftButton) {
        rotationX += 180 * dy;
        rotationY += 180 * dx;
        glwidget->updateGL();
    } else if (event->buttons() & Qt::RightButton) {
        rotationX += 180 * dy;
        rotationZ += 180 * dx;
        glwidget->updateGL();
    }
    lastPos = event->pos();
}
 
void QtGL::mouseDoubleClickEvent(QMouseEvent *event)
{
    int face = faceAtPosition(event->pos());
    if (face != -1) {
        QColor color = QColorDialog::getColor(faceColors[face], this);
        if (color.isValid()) {
            faceColors[face] = color;
            glwidget->updateGL();
        }
    }
}
 
int QtGL::faceAtPosition(const QPoint &pos)
{
    const int MaxSize = 512;
    GLuint buffer[MaxSize];
    GLint viewport[4];
 
    glwidget->makeCurrent();
 
    glGetIntegerv(GL_VIEWPORT, viewport);
    glSelectBuffer(MaxSize, buffer);
    glRenderMode(GL_SELECT);
 
    glInitNames();
    glPushName(0);
 
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    gluPickMatrix(GLdouble(pos.x()), GLdouble(viewport[3] - pos.y()),
                  5.0, 5.0, viewport);
    GLfloat x = GLfloat(width()) / height();
    glFrustum(-x, x, -1.0, 1.0, 4.0, 15.0);
    draw();
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();
 
    if (!glRenderMode(GL_RENDER))
        return -1;
    return buffer[3];
}

#include "qtgl.h"
#include <QtOpenGL>

QtGL::QtGL(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	ui.setupUi(this);
	glwidget = new QGLWidget(parent);
	
}

QtGL::~QtGL()
{

}

void QtGL::initializeGL()
{
    glwidget->qglClearColor(Qt::black);
    glShadeModel(GL_FLAT);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);
}

void QtGL::resizeGL(int width, int height)
{
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    GLfloat x = GLfloat(width) / height;
    glFrustum(-x, +x, -1.0, +1.0, 4.0, 15.0);
    glMatrixMode(GL_MODELVIEW);
}

void QtGL::paintGL()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    draw();
}

void QtGL::draw()
{
    static const GLfloat P1[3] = { 0.0, -1.0, +2.0 };
    static const GLfloat P2[3] = { +1.73205081, -1.0, -1.0 };
    static const GLfloat P3[3] = { -1.73205081, -1.0, -1.0 };
    static const GLfloat P4[3] = { 0.0, +2.0, 0.0 };

    static const GLfloat * const coords[4][3] = {
        { P1, P2, P3 }, { P1, P3, P4 }, { P1, P4, P2 }, { P2, P4, P3 }
    };

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0.0, 0.0, -10.0);
    glRotatef(rotationX, 1.0, 0.0, 0.0);
    glRotatef(rotationY, 0.0, 1.0, 0.0);
    glRotatef(rotationZ, 0.0, 0.0, 1.0);

    for (int i = 0; i < 4; ++i) {
        glLoadName(i);
        glBegin(GL_TRIANGLES);
        glwidget->qglColor(faceColors[i]);
        for (int j = 0; j < 3; ++j) {
            glVertex3f(coords[i][j][0], coords[i][j][1],
                       coords[i][j][2]);
        }
        glEnd();
    }
}

void QtGL::mousePressEvent(QMouseEvent *event)
{
    lastPos = event->pos();
}

void QtGL::mouseMoveEvent(QMouseEvent *event)
{
    GLfloat dx = GLfloat(event->x() - lastPos.x()) / width();
    GLfloat dy = GLfloat(event->y() - lastPos.y()) / height();
    if (event->buttons() & Qt::LeftButton) {
        rotationX += 180 * dy;
        rotationY += 180 * dx;
        glwidget->updateGL();
    } else if (event->buttons() & Qt::RightButton) {
        rotationX += 180 * dy;
        rotationZ += 180 * dx;
        glwidget->updateGL();
    }
    lastPos = event->pos();
}

void QtGL::mouseDoubleClickEvent(QMouseEvent *event)
{
    int face = faceAtPosition(event->pos());
    if (face != -1) {
        QColor color = QColorDialog::getColor(faceColors[face], this);
        if (color.isValid()) {
            faceColors[face] = color;
            glwidget->updateGL();
        }
    }
}

int QtGL::faceAtPosition(const QPoint &pos)
{
    const int MaxSize = 512;
    GLuint buffer[MaxSize];
    GLint viewport[4];

    glwidget->makeCurrent();

    glGetIntegerv(GL_VIEWPORT, viewport);
    glSelectBuffer(MaxSize, buffer);
    glRenderMode(GL_SELECT);

    glInitNames();
    glPushName(0);

    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    gluPickMatrix(GLdouble(pos.x()), GLdouble(viewport[3] - pos.y()),
                  5.0, 5.0, viewport);
    GLfloat x = GLfloat(width()) / height();
    glFrustum(-x, x, -1.0, 1.0, 4.0, 15.0);
    draw();
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();

    if (!glRenderMode(GL_RENDER))
        return -1;
    return buffer[3];
}

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[jpn]

You are supposed to subclass QGLWidget, and reimplement all those xxxGL() methods in that class, not in a QMainWindow subclass.

[bod]

So, u mean i need to write 2 ".h", and 2 ".cpp" file??

[jpn]

So, u mean i need to write 2 ".h", and 2 ".cpp" file??

If you have two classes in the end, that would be a good practice.