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 QGeoMapController::cameraDataChanged(const QGeoCameraData &cameraData)
{
if (oldCameraData_.center() != cameraData.center())
emit centerChanged(cameraData.center());
if (oldCameraData_.bearing() != cameraData.bearing())
emit bearingChanged(cameraData.bearing());
if (oldCameraData_.tilt() != cameraData.tilt())
emit tiltChanged(cameraData.tilt());
if (oldCameraData_.roll() != cameraData.roll())
emit rollChanged(cameraData.roll());
if (oldCameraData_.zoomLevel() != cameraData.zoomLevel())
emit zoomChanged(cameraData.zoomLevel());
oldCameraData_ = cameraData;
}
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();
}
Frustum QGeoCameraTilesPrivate::frustum(double fieldOfViewGradient) const
{
QDoubleVector3D center = sideLength_ * QGeoProjection::coordToMercator(camera_.center());
center.setZ(0.0);
double f = qMin(screenSize_.width(), screenSize_.height()) / (1.0 * tileSize_);
double z = std::pow(2.0, camera_.zoomLevel() - intZoomLevel_);
double altitude = f / (2.0 * z);
QDoubleVector3D eye = center;
eye.setZ(altitude);
QDoubleVector3D view = eye - center;
QDoubleVector3D side = QDoubleVector3D::normal(view, QDoubleVector3D(0.0, 1.0, 0.0));
QDoubleVector3D up = QDoubleVector3D::normal(side, view);
double nearPlane = sideLength_ / (1.0 * tileSize_ * (1 << maxZoom_));
double farPlane = 3.0;
double aspectRatio = 1.0 * screenSize_.width() / screenSize_.height();
double hn = 0.0;
double wn = 0.0;
double hf = 0.0;
double wf = 0.0;
// fixes field of view at 45 degrees
// this assumes that viewSize = 2*nearPlane x 2*nearPlane
if (aspectRatio > 1.0) {
hn = 2 * fieldOfViewGradient * nearPlane;
wn = hn * aspectRatio;
hf = 2 * fieldOfViewGradient * farPlane;
wf = hf * aspectRatio;
} else {
wn = 2 * fieldOfViewGradient * nearPlane;
hn = wn / aspectRatio;
wf = 2 * fieldOfViewGradient * farPlane;
hf = wf / aspectRatio;
}
QDoubleVector3D d = center - eye;
d.normalize();
up.normalize();
QDoubleVector3D right = QDoubleVector3D::normal(d, up);
QDoubleVector3D cf = eye + d * farPlane;
QDoubleVector3D cn = eye + d * nearPlane;
Frustum frustum;
frustum.topLeftFar = cf + (up * hf / 2) - (right * wf / 2);
frustum.topRightFar = cf + (up * hf / 2) + (right * wf / 2);
frustum.bottomLeftFar = cf - (up * hf / 2) - (right * wf / 2);
frustum.bottomRightFar = cf - (up * hf / 2) + (right * wf / 2);
frustum.topLeftNear = cn + (up * hn / 2) - (right * wn / 2);
frustum.topRightNear = cn + (up * hn / 2) + (right * wn / 2);
frustum.bottomLeftNear = cn - (up * hn / 2) - (right * wn / 2);
frustum.bottomRightNear = cn - (up * hn / 2) + (right * wn / 2);
return frustum;
}