82 lines
2.9 KiB
Dart
82 lines
2.9 KiB
Dart
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import 'dart:io';
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import 'package:path_provider/path_provider.dart';
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import '../models/track.dart';
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import 'track_database.dart';
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/// GPX 1.1 fájl generáló.
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/// A GPX az összes standard alkalmazással kompatibilis (OsmAnd, Komoot,
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/// QGIS, gpsvisualizer.com stb.).
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class GpxExporter {
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final TrackDatabase _db;
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GpxExporter([TrackDatabase? db]) : _db = db ?? TrackDatabase.instance;
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/// Elkészíti a GPX fájlt és visszaadja az elérési utat.
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Future<String> export(Track track) async {
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final points = await _db.getPoints(track.id!);
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final xml = _buildGpx(track, points);
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final dir = await getExternalStorageDirectory() ??
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await getApplicationDocumentsDirectory();
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final safeName =
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track.name.replaceAll(RegExp(r'[^a-zA-Z0-9_\-]'), '_').toLowerCase();
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final file = File('${dir.path}/${safeName}_${track.id}.gpx');
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await file.writeAsString(xml, encoding: utf8_encoding);
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return file.path;
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}
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String _buildGpx(Track track, List<TrackPoint> points) {
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final buf = StringBuffer();
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buf.writeln('<?xml version="1.0" encoding="UTF-8"?>');
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buf.writeln('<gpx version="1.1" creator="Terepi Segéd"');
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buf.writeln(' xmlns="http://www.topografix.com/GPX/1/1"');
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buf.writeln(' xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"');
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buf.writeln(' xsi:schemaLocation="http://www.topografix.com/GPX/1/1 '
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'http://www.topografix.com/GPX/1/1/gpx.xsd">');
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buf.writeln(' <metadata>');
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buf.writeln(' <name>${_esc(track.name)}</name>');
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buf.writeln(
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' <time>${track.startTime.toUtc().toIso8601String()}</time>');
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buf.writeln(' </metadata>');
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buf.writeln(' <trk>');
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buf.writeln(' <name>${_esc(track.name)}</name>');
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buf.writeln(' <desc>Forrás: ${_esc(track.source)}, '
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'${track.pointCount} pont, '
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'${track.distanceFormatted}</desc>');
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buf.writeln(' <trkseg>');
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for (final pt in points) {
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buf.write(' <trkpt lat="${pt.latitude}" lon="${pt.longitude}">');
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if (pt.altitude != null) {
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buf.write('<ele>${pt.altitude!.toStringAsFixed(3)}</ele>');
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}
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buf.write('<time>${pt.timestamp.toUtc().toIso8601String()}</time>');
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if (pt.speed != null) {
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buf.write('<speed>${pt.speed!.toStringAsFixed(2)}</speed>');
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}
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if (pt.heading != null) {
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buf.write('<course>${pt.heading!.toStringAsFixed(1)}</course>');
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}
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if (pt.accuracy != null) {
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buf.write('<hdop>${pt.accuracy!.toStringAsFixed(2)}</hdop>');
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}
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buf.writeln('</trkpt>');
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}
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buf.writeln(' </trkseg>');
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buf.writeln(' </trk>');
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buf.writeln('</gpx>');
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return buf.toString();
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}
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String _esc(String s) => s
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.replaceAll('&', '&')
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.replaceAll('<', '<')
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.replaceAll('>', '>')
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.replaceAll('"', '"');
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}
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// ignore: non_constant_identifier_names
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final utf8_encoding = const SystemEncoding();
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