63 lines
1.6 KiB
Dart
63 lines
1.6 KiB
Dart
import 'package:google_maps_flutter/google_maps_flutter.dart';
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List<LatLng> decodePolylineIsolate(String encoded) {
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List<LatLng> points = [];
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int index = 0, len = encoded.length;
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int lat = 0, lng = 0;
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while (index < len) {
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int b, shift = 0, result = 0;
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do {
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b = encoded.codeUnitAt(index++) - 63;
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result |= (b & 0x1f) << shift;
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shift += 5;
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} while (b >= 0x20);
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int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
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lat += dlat;
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shift = 0;
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result = 0;
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do {
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b = encoded.codeUnitAt(index++) - 63;
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result |= (b & 0x1f) << shift;
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shift += 5;
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} while (b >= 0x20);
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int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
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lng += dlng;
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points.add(LatLng(lat / 1E5, lng / 1E5));
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}
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return points;
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}
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// Helper method for decoding polyline (if not already defined)
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// List<LatLng> decodePolyline(String encoded) {
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// List<LatLng> points = [];
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// int index = 0, len = encoded.length;
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// int lat = 0, lng = 0;
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// while (index < len) {
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// int b, shift = 0, result = 0;
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// do {
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// b = encoded.codeUnitAt(index++) - 63;
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// result |= (b & 0x1f) << shift;
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// shift += 5;
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// } while (b >= 0x20);
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// int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
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// lat += dlat;
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// shift = 0;
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// result = 0;
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// do {
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// b = encoded.codeUnitAt(index++) - 63;
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// result |= (b & 0x1f) << shift;
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// shift += 5;
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// } while (b >= 0x20);
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// int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
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// lng += dlng;
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// points.add(LatLng(lat / 1E5, lng / 1E5));
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// }
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// return points;
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// }
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