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test

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randogoth 2025-02-27 14:38:03 +02:00
parent a5851e71fb
commit 2a093e3126
4 changed files with 149 additions and 20 deletions
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38
lib/rugreefer.dart
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@ -8,21 +8,19 @@ import 'package:turf/turf.dart';
class GeoMetadataLookup {
final String apiUrl;
final Directory cacheDir;
final double distanceThreshold;
final Distance distance = const Distance();
GeoMetadataLookup({
required this.apiUrl,
required this.cacheDir,
this.distanceThreshold = 10.0, // Default 10 meters
}) {
if (!cacheDir.existsSync()) {
cacheDir.createSync(recursive: true);
}
}
Future<List<Map<String, dynamic>>> lookup(double latitude, double longitude) async {
final String geohash = GeoHasher().encode(latitude, longitude, precision: 4);
Future<List<Map<String, dynamic>>> lookup(double latitude, double longitude, {double distance = 10.0}) async {
final String geohash = GeoHasher().encode(longitude, latitude);
final File cacheFile = File('${cacheDir.path}/$geohash.geojson.gz');
if (!cacheFile.existsSync()) {
@ -31,11 +29,11 @@ class GeoMetadataLookup {
final String geoJsonStr = utf8.decode(GZipCodec().decode(cacheFile.readAsBytesSync()));
final Map<String, dynamic> geoJson = jsonDecode(geoJsonStr);
return _findMetadata(latitude, longitude, geoJson);
return _findMetadata(latitude, longitude, distance, geoJson);
}
Future<void> _downloadGeoJson(String geohash, File cacheFile) async {
final response = await http.get(Uri.parse('$apiUrl/$geohash.geojson.gz'));
final response = await http.get(Uri.parse('$apiUrl$geohash'));
if (response.statusCode == 200) {
cacheFile.writeAsBytesSync(GZipCodec().encode(response.bodyBytes));
} else {
@ -43,8 +41,8 @@ class GeoMetadataLookup {
}
}
List<Map<String, dynamic>> _findMetadata(double latitude, double longitude, Map<String, dynamic> geoJson) {
final Point point = Point(coordinates: Position(longitude, latitude));
List<Map<String, dynamic>> _findMetadata(double latitude, double longitude, double distanceThreshold, Map<String, dynamic> geoJson) {
final Position point = Position(longitude, latitude);
List<Map<String, dynamic>> results = [];
for (var feature in geoJson['features']) {
@ -59,19 +57,30 @@ class GeoMetadataLookup {
.toList())
.toList(),
);
if (booleanPointInPolygon(point, polygon)) {
results.add({'type': 'polygon', ...properties});
}
}
else if (geometry['type'] == 'LineString') {
final line = LineString(coordinates: (geometry['coordinates'] as List).map((p) => Position(p[0], p[1])).toList());
if (_isPointNearLine(point, line)) {
final line = LineString(
coordinates: (geometry['coordinates'] as List)
.map((p) => Position(p[0] as double, p[1] as double))
.toList(),
);
if (_isPointNearLine(point, line, distanceThreshold)) {
results.add({'type': 'line', ...properties});
}
}
else if (geometry['type'] == 'MultiLineString') {
for (var lineCoords in geometry['coordinates']) {
final line = LineString(coordinates: lineCoords.map((p) => Position(p[0], p[1])).toList());
if (_isPointNearLine(point, line)) {
final line = LineString(
coordinates: (lineCoords as List)
.map((p) => Position(p[0] as double, p[1] as double))
.toList(),
);
if (_isPointNearLine(point, line, distanceThreshold)) {
results.add({'type': 'multi_line', ...properties});
break;
}
@ -81,12 +90,11 @@ class GeoMetadataLookup {
return results;
}
bool _isPointNearLine(Point point, LineString line) {
bool _isPointNearLine(Position point, LineString line, double distanceThreshold) {
for (var i = 0; i < line.coordinates.length - 1; i++) {
final p1 = line.coordinates[i];
final p2 = line.coordinates[i + 1];
final double dist = distance.distance(
LatLng(point.coordinates.lat.toDouble(), point.coordinates.lng.toDouble()),
LatLng(point.lat.toDouble(), point.lng.toDouble()),
LatLng(p1.lat.toDouble(), p1.lng.toDouble()),
);
if (dist <= distanceThreshold) return true;