// 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);
}
void CubeItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
if (navigating) {
QPoint delta = event->pos().toPoint() - pressedPos;
int deltax = delta.x();
int deltay = delta.y();
QGLCamera *camera = this->camera();
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 = startNavCamera->pan(-anglex);
q *= startNavCamera->tilt(-angley);
camera->setEye(startNavCamera->eye());
camera->setCenter(startNavCamera->center());
camera->setUpVector(startNavCamera->upVector());
camera->rotateCenter(q);
} else if (pressedFace != -1) {
int face;
QPoint pos = cubeIntersection
(event->widget(), event->pos().toPoint(), &face);
if (face != pressedFace)
pos = QPoint(-1, -1);
deliverSceneEvent(pos, event);
return;
}
QGraphicsItem::mouseMoveEvent(event);
}
