[Qt-interest] Problem using OpenGL from Qt Application

[Sujan Dasmahapatra]

Dear Friends

I am trying create an OpenGL graphics from within my QT application. I am
getting the openGL window but I am unable see any graphicsItem on it.See
below the code snippet

class GraphicsView : public QGLWidget
{
       Q_OBJECT
public:
        GraphicsView();
       ~GraphicsView();
protected:
      void initializeGL();
      void paintGL();
private:
 QColor trolltechGreen;
        QColor trolltechPurple;

    GLuint   object;
    GLuint  makeobject();
void quad(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,
              GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4);
        void extrude(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2);
};

GraphicsView::GraphicsView()
{
   object = 0;
trolltechGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
    trolltechPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);

}
GraphicsView::~GraphicsView()
{
}

void GraphicsView::initialize()
{
  qglClearColor(trolltechPurple.dark());
    object = makeObject();
    glShadeModel(GL_FLAT);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);


}

void GraphicsView::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glTranslated(0.0, 0.0, -10.0);
    glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
    glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
    glRotated(zRot / 16.0, 0.0, 0.0, 1.0);
    glCallList(object);

}

GLuint GraphicsView::makeobject()
{
       GLuint list = glGenLists(1);
    glNewList(list, GL_COMPILE);

    glBegin(GL_QUADS);

    GLdouble x1 = +0.06;
    GLdouble y1 = -0.14;
    GLdouble x2 = +0.14;
    GLdouble y2 = -0.06;
    GLdouble x3 = +0.08;
    GLdouble y3 = +0.00;
    GLdouble x4 = +0.30;
    GLdouble y4 = +0.22;

    quad(x1, y1, x2, y2, y2, x2, y1, x1);
    quad(x3, y3, x4, y4, y4, x4, y3, x3);

    extrude(x1, y1, x2, y2);
    extrude(x2, y2, y2, x2);
    extrude(y2, x2, y1, x1);
    extrude(y1, x1, x1, y1);
    extrude(x3, y3, x4, y4);
    extrude(x4, y4, y4, x4);
    extrude(y4, x4, y3, x3);

    const double Pi = 3.14159265358979323846;
    const int NumSectors = 200;

    for (int i = 0; i < NumSectors; ++i) {
        double angle1 = (i * 2 * Pi) / NumSectors;
        GLdouble x5 = 0.30 * sin(angle1);
        GLdouble y5 = 0.30 * cos(angle1);
        GLdouble x6 = 0.20 * sin(angle1);
        GLdouble y6 = 0.20 * cos(angle1);

        double angle2 = ((i + 1) * 2 * Pi) / NumSectors;
        GLdouble x7 = 0.20 * sin(angle2);
        GLdouble y7 = 0.20 * cos(angle2);
        GLdouble x8 = 0.30 * sin(angle2);
        GLdouble y8 = 0.30 * cos(angle2);

        quad(x5, y5, x6, y6, x7, y7, x8, y8);

        extrude(x6, y6, x7, y7);
        extrude(x8, y8, x5, y5);
    }

    glEnd();

    glEndList();
    return list;


}

void GraphicsView::quad(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,
                    GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4)
{
    qglColor(trolltechGreen);

    glVertex3d(x1, y1, -0.05);
    glVertex3d(x2, y2, -0.05);
    glVertex3d(x3, y3, -0.05);
    glVertex3d(x4, y4, -0.05);

    glVertex3d(x4, y4, +0.05);
    glVertex3d(x3, y3, +0.05);
    glVertex3d(x2, y2, +0.05);
    glVertex3d(x1, y1, +0.05);
}

void GraphicsView::extrude(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble
y2)
{
    qglColor(trolltechGreen.dark(250 + int(100 * x1)));

    glVertex3d(x1, y1, +0.05);
    glVertex3d(x2, y2, +0.05);
    glVertex3d(x2, y2, -0.05);
    glVertex3d(x1, y1, -0.05);
}

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Now I am creating the instance of this openGL window in the mainwindow
which is further called in  the main.
// My OpenGL black color background window is coming but there's no item
that I am creating using makeobject()
MainWindow::startMesh()
{
    GraphicsView   *view = new GraphicsView(this);
    view->show();
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Can someone tell me whats going wrong  in this !!! Any help would be
appreciated
Thanks !




-- 
Thanks & Regards
S. Dasmahapatra
B.E. (Aeronautics-Aerodynamics)
Bangalore, India
Ph:91-9900839788
Office:91-80-66470248
mail id : sujan.dasmahapatra at gmail.com
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