QVariant cameraInterpolator(const QGeoCameraData &start,
const QGeoCameraData &end,
qreal progress)
{
QGeoCameraData result = start;
QGeoCoordinate from = start.center();
QGeoCoordinate to = end.center();
if (from == to) {
if (progress < 0.5) {
result.setCenter(from);
} else {
result.setCenter(to);
}
}
else {
QGeoCoordinate coordinateResult = QGeoProjection::coordinateInterpolation(from, to, progress);
result.setCenter(coordinateResult);
}
double sf = 1.0 - progress;
double ef = progress;
result.setBearing(sf * start.bearing() + ef * end.bearing());
result.setTilt(sf * start.tilt() + ef * end.tilt());
result.setRoll(sf * start.roll() + ef * end.roll());
result.setZoomLevel(sf * start.zoomLevel() + ef * end.zoomLevel());
return QVariant::fromValue(result);
}
void QGeoMapController::setRoll(qreal roll)
{
QGeoCameraData cd = map_->cameraData();
if (roll == cd.roll())
return;
cd.setRoll(roll);
map_->setCameraData(cd);
}