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Calculate boundaries of nearby places, without iterating all of them again

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This commit is contained in:
neslihanturan 2018-02-23 14:24:28 +03:00
parent 1320952373
commit 283bc35a4a
1 changed files with 32 additions and 3 deletions
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35
app/src/main/java/fr/free/nrw/commons/nearby/NearbyController.java
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@ -42,17 +42,39 @@ public class NearbyController {
* @param curLatLng current location for user
* @return Place list without distance information
*/
public List<Place> loadAttractionsFromLocation(LatLng curLatLng) {
//public List<Place> loadAttractionsFromLocation(LatLng curLatLng) {
public NearbyPlacesInfo loadAttractionsFromLocation(LatLng curLatLng) {
Timber.d("Loading attractions near %s", curLatLng);
NearbyPlacesInfo nearbyPlacesInfo = new NearbyPlacesInfo();
//LatLng[] cornerCoordinates = new LatLng[4];
//LatLng west, east, north, south = new LatLng(0,0,0);
if (curLatLng == null) {
return Collections.emptyList();
//return Collections.emptyList();
return null;
}
List<Place> places = nearbyPlaces.getFromWikidataQuery(curLatLng, Locale.getDefault().getLanguage());
LatLng[] boundaryCoordinates = {places.get(0).location, // south
places.get(0).location, // north
places.get(0).location, // west
places.get(0).location};// east, init with a random location
if (curLatLng != null) {
Timber.d("Sorting places by distance...");
final Map<Place, Double> distances = new HashMap<>();
for (Place place: places) {
distances.put(place, computeDistanceBetween(place.location, curLatLng));
// Find boundaries with basic find max approach
if (place.location.getLatitude() < boundaryCoordinates[0].getLatitude()) {
boundaryCoordinates[0] = place.location;
}
if (place.location.getLatitude() > boundaryCoordinates[1].getLatitude()) {
boundaryCoordinates[1] = place.location;
}
if (place.location.getLongitude() < boundaryCoordinates[2].getLongitude()) {
boundaryCoordinates[2] = place.location;
}
if (place.location.getLongitude() > boundaryCoordinates[3].getLongitude()) {
boundaryCoordinates[3] = place.location;
}
}
Collections.sort(places,
(lhs, rhs) -> {
@ -62,7 +84,9 @@ public class NearbyController {
}
);
}
return places;
nearbyPlacesInfo.placeList = places;
nearbyPlacesInfo.boundaryCoordinates = boundaryCoordinates;
return nearbyPlacesInfo;
}
/**
@ -123,4 +147,9 @@ public class NearbyController {
}
return baseMarkerOptions;
}
public class NearbyPlacesInfo {
List<Place> placeList; // List of nearby places
LatLng[] boundaryCoordinates; // Corners of nearby area
}
}