// Pan left/right/up/down without rotating about the object.
void QGLGraphicsNavigationItemPrivate::pan(qreal deltax, qreal deltay)
{
QGLCamera *camera = viewportItem->camera();
QPointF delta = viewDelta(deltax, deltay);
QVector3D t = camera->translation(delta.x(), -delta.y(), 0.0f);
// Technically panning the eye left should make the object appear to
// move off to the right, but this looks weird on-screen where the user
// actually thinks they are picking up the object and dragging it rather
// than moving the eye. We therefore apply the inverse of the translation
// to make it "look right".
camera->setEye(camera->eye() - t);
camera->setCenter(camera->center() - t);
}
void SpotView::paintGL()
{
QGLPainter painter(this);
//painter.begin();
painter.clear();
// Set perspective transformation and position model-view matrix
QGLCamera camera;
QVector3D sceneOrigin = floor->boundingBox().center();
camera.setCenter(sceneOrigin);
camera.setEye(sceneOrigin + QVector3D(0.0f, 5.0f, 20.0f));
camera.apply(&painter);
paintGL(&painter);
}
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);
}
