CODEWITHSUNDEEP
c++qtopengl
Violet Giraffe
Violet Giraffe

Reputation: 33579

How to force QGLWidget to update screen?

I’m drawing a simple scene with Open GL. I’ve subclassed QGLWidget and overriden paintGL(). Nothing fancy there:

void CGLWidget::paintGL()
 {
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    glClear(GL_COLOR_BUFFER_BIT);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    gluLookAt (120.0, 160.0, -300.0, 0.0 + 120.0, 0.0 + 160.0, 2.0 - 300.0, 0.0, 1.0, 0.0);
    glScalef(1.0f/300.0f, 1.0f/300.0f, 1.0f/300.0f);
    glClear(GL_DEPTH_BUFFER_BIT);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(80.0, width()/(double)height(), 5.0, 100000.0);

    glMatrixMode(GL_MODELVIEW);
    glBegin(GL_POINTS);
    glColor3f(1.0f,0.6f,0.0f);
    glVertex3d(x, y, z);

    // ...drawing some more points...

    glEnd();

 }

I have a timer in main window which triggers updateGL() of GL widget. I’ve verified that it results in paintGL() being called. However, the actual picture on the screen is only updated very rarely. Even if I resize the window, scene is not updated. Why is that and how can I force it to update?

Upvotes: 6

Views: 15643

Answers (2)

Adorn
Adorn

Reputation: 1421

inside your CGLWidget constructor

QTimer *timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(update()));
timer->start(10);

timer -> start(VALUE);

play with `VALUE 10 is just an example.

Adorn

Upvotes: 6

Pete
Pete

Reputation: 4812

Don't call updateGL() from your timer, call update() instead to ensure that the view gets a paint event.

Upvotes: 14

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