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::setZoom(qreal zoom)
{
QGeoCameraData cd = map_->cameraData();
if (zoom == cd.zoomLevel())
return;
cd.setZoomLevel(zoom);
map_->setCameraData(cd);
}
void QGeoTiledMapDataPrivate::changeCameraData(const QGeoCameraData &oldCameraData)
{
double lat = oldCameraData.center().latitude();
if (mapScene_->verticalLock()) {
QGeoCoordinate coord = map_->cameraData().center();
coord.setLatitude(lat);
map_->cameraData().setCenter(coord);
}
// For zoomlevel, "snap" 0.05 either side of a whole number.
// This is so that when we turn off bilinear scaling, we're
// snapped to the exact pixel size of the tiles
QGeoCameraData cam = map_->cameraData();
int izl = static_cast<int>(std::floor(cam.zoomLevel()));
float delta = cam.zoomLevel() - izl;
if (delta > 0.5) {
izl++;
delta -= 1.0;
}
if (qAbs(delta) < 0.05) {
cam.setZoomLevel(izl);
}
cameraTiles_->setCamera(cam);
mapScene_->setCameraData(cam);
mapScene_->setVisibleTiles(cameraTiles_->tiles());
if (tileRequests_) {
// don't request tiles that are already built and textured
QList<QSharedPointer<QGeoTileTexture> > cachedTiles =
tileRequests_->requestTiles(cameraTiles_->tiles() - mapScene_->texturedTiles());
foreach (const QSharedPointer<QGeoTileTexture> &tex, cachedTiles) {
mapScene_->addTile(tex->spec, tex);
}
if (!cachedTiles.isEmpty())
map_->update();
}