Track, nyomkövetés hozzáadása

2026-05-10 02:31:27 +02:00
parent 810e118059
commit 7192fa5322
16 changed files with 1613 additions and 27 deletions
@@ -0,0 +1,81 @@
+import 'dart:io';
+import 'package:path_provider/path_provider.dart';
+import '../models/track.dart';
+import 'track_database.dart';
+
+/// GPX 1.1 fájl generáló.
+/// A GPX az összes standard alkalmazással kompatibilis (OsmAnd, Komoot,
+/// QGIS, gpsvisualizer.com stb.).
+class GpxExporter {
+  final TrackDatabase _db;
+  GpxExporter([TrackDatabase? db]) : _db = db ?? TrackDatabase.instance;
+
+  /// Elkészíti a GPX fájlt és visszaadja az elérési utat.
+  Future<String> export(Track track) async {
+    final points = await _db.getPoints(track.id!);
+    final xml = _buildGpx(track, points);
+
+    final dir = await getExternalStorageDirectory() ??
+        await getApplicationDocumentsDirectory();
+    final safeName =
+        track.name.replaceAll(RegExp(r'[^a-zA-Z0-9_\-]'), '_').toLowerCase();
+    final file = File('${dir.path}/${safeName}_${track.id}.gpx');
+    await file.writeAsString(xml, encoding: utf8_encoding);
+    return file.path;
+  }
+
+  String _buildGpx(Track track, List<TrackPoint> points) {
+    final buf = StringBuffer();
+    buf.writeln('<?xml version="1.0" encoding="UTF-8"?>');
+    buf.writeln('<gpx version="1.1" creator="Terepi Segéd"');
+    buf.writeln('     xmlns="http://www.topografix.com/GPX/1/1"');
+    buf.writeln('     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"');
+    buf.writeln('     xsi:schemaLocation="http://www.topografix.com/GPX/1/1 '
+        'http://www.topografix.com/GPX/1/1/gpx.xsd">');
+
+    buf.writeln('  <metadata>');
+    buf.writeln('    <name>${_esc(track.name)}</name>');
+    buf.writeln(
+        '    <time>${track.startTime.toUtc().toIso8601String()}</time>');
+    buf.writeln('  </metadata>');
+
+    buf.writeln('  <trk>');
+    buf.writeln('    <name>${_esc(track.name)}</name>');
+    buf.writeln('    <desc>Forrás: ${_esc(track.source)}, '
+        '${track.pointCount} pont, '
+        '${track.distanceFormatted}</desc>');
+    buf.writeln('    <trkseg>');
+
+    for (final pt in points) {
+      buf.write('      <trkpt lat="${pt.latitude}" lon="${pt.longitude}">');
+      if (pt.altitude != null) {
+        buf.write('<ele>${pt.altitude!.toStringAsFixed(3)}</ele>');
+      }
+      buf.write('<time>${pt.timestamp.toUtc().toIso8601String()}</time>');
+      if (pt.speed != null) {
+        buf.write('<speed>${pt.speed!.toStringAsFixed(2)}</speed>');
+      }
+      if (pt.heading != null) {
+        buf.write('<course>${pt.heading!.toStringAsFixed(1)}</course>');
+      }
+      if (pt.accuracy != null) {
+        buf.write('<hdop>${pt.accuracy!.toStringAsFixed(2)}</hdop>');
+      }
+      buf.writeln('</trkpt>');
+    }
+
+    buf.writeln('    </trkseg>');
+    buf.writeln('  </trk>');
+    buf.writeln('</gpx>');
+    return buf.toString();
+  }
+
+  String _esc(String s) => s
+      .replaceAll('&', '&amp;')
+      .replaceAll('<', '&lt;')
+      .replaceAll('>', '&gt;')
+      .replaceAll('"', '&quot;');
+}
+
+// ignore: non_constant_identifier_names
+final utf8_encoding = const SystemEncoding();