QDebug operator<<(QDebug dbg, const QGLCamera &cam)
{
dbg << "QGLCamera";
if (!cam.objectName().isEmpty())
dbg << cam.objectName();
dbg << "\n";
dbg << " projection:" << ( cam.projectionType() == QGLCamera::Perspective ?
"Perspective" : "Orthographic" );
dbg << "-- viewsize:" << cam.viewSize().width() << "x" << cam.viewSize().height() << "\n";
dbg << " near-plane:" << cam.nearPlane() << "-- far-plane:" << cam.farPlane();
dbg << "-- field-of-view:" << cam.fieldOfView() << "\n";
dbg << " rotation:" << cam.screenRotation() << " -- motion adjust:" <<
cam.motionAdjustment() << " -- aspect adjust:" << cam.adjustForAspectRatio() << "\n";
dbg << " eye:" << cam.eye() << "-- center:" << cam.center();
dbg << "-- up:" << cam.upVector() << "\n";
return dbg;
}
// Convert deltas in the X and Y directions into percentages of
// the view width and height.
QPointF QGLGraphicsNavigationItemPrivate::viewDelta(qreal deltax, qreal deltay)
{
QRectF rect = viewportItem->rect();
qreal w = rect.width();
qreal h = rect.height();
QGLCamera *camera = viewportItem->camera();
bool scaleToWidth;
qreal scaleFactor, scaleX, scaleY;
QSizeF viewSize = camera->viewSize();
if (w >= h) {
if (viewSize.width() >= viewSize.height())
scaleToWidth = true;
else
scaleToWidth = false;
} else {
if (viewSize.width() >= viewSize.height())
scaleToWidth = false;
else
scaleToWidth = true;
}
int rotation = camera->screenRotation();
if (rotation == 90 || rotation == 270) {
scaleToWidth = !scaleToWidth;
qSwap(deltax, deltay);
}
if (rotation == 90 || rotation == 180) {
deltax = -deltax;
}
if (rotation == 180 || rotation == 270) {
deltay = -deltay;
}
if (scaleToWidth) {
scaleFactor = 2.0f / viewSize.width();
scaleX = scaleFactor * h / w;
scaleY = scaleFactor;
} else {
scaleFactor = 2.0f / viewSize.height();
scaleX = scaleFactor;
scaleY = scaleFactor * w / h;
}
return QPointF(deltax * scaleX / w, deltay * scaleY / h);
}
// 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);
}
