C++ (Cpp) QGLCamera::tilt Exemples

Exemple #1

Fichier : qglgraphicsnavigationitem.cpp Projet : slavablind91/code

// Rotate about the object being viewed.
void QGLGraphicsNavigationItemPrivate::rotate(qreal deltax, qreal deltay)
{
    QGLCamera *camera = viewportItem->camera();
    QRectF rect = viewportItem->rect();
    int rotation = camera->screenRotation();
    if (rotation == 90 || rotation == 270) {
        qSwap(deltax, deltay);
    }
    if (rotation == 90 || rotation == 180) {
        deltax = -deltax;
    }
    if (rotation == 180 || rotation == 270) {
        deltay = -deltay;
    }
    qreal anglex = deltax * 90.0f / rect.width();
    qreal angley = deltay * 90.0f / rect.height();
    QQuaternion q = camera->pan(-anglex);
    q *= camera->tilt(-angley);
    camera->rotateCenter(q);
}