Kml, kmz és geojson import és térképi megjelnítésük.

2026-06-21 10:07:35 +02:00
parent 0828630a5b
commit 7c29bc7ae5
14 changed files with 1095 additions and 13 deletions
@@ -0,0 +1,272 @@
+// KML és KMZ → flutter_map objektumok
+//
+// FONTOS: KML koordináta sorrend: lon,lat,alt
+// Flutter LatLng(lat, lon) — tehát fordítva kell olvasni!
+//
+// KMZ = ZIP archív, benne doc.kml
+
+import 'dart:typed_data';
+import 'package:archive/archive.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_map/flutter_map.dart';
+import 'package:latlong2/latlong.dart';
+import 'package:terepi_seged/enums/layer_import_source_type.dart';
+import 'package:uuid/uuid.dart';
+import 'package:xml/xml.dart';
+
+import '../models/imported_layer.dart';
+
+class KmlParser {
+  // Alapértelmezett stílusok — felülírhatók konstruktorban
+  final Color defaultPolylineColor;
+  final double defaultPolylineStroke;
+  final Color defaultPolygonFillColor;
+  final Color defaultPolygonBorderColor;
+  final double defaultPolygonBorderStroke;
+  final Color defaultMarkerColor;
+
+  const KmlParser({
+    this.defaultPolylineColor = const Color(0xCC1565C0), // kék
+    this.defaultPolylineStroke = 3.0,
+    this.defaultPolygonFillColor = const Color(0x4D1565C0),
+    this.defaultPolygonBorderColor = const Color(0xCC1565C0),
+    this.defaultPolygonBorderStroke = 1.5,
+    this.defaultMarkerColor = Colors.red,
+  });
+
+  // ── KMZ (ZIP → KML) ──────────────────────────────────────────────
+
+  ImportedLayer parseKmz(Uint8List bytes, String fileName,
+      {String? id, bool isVisible = true}) {
+    final archive = ZipDecoder().decodeBytes(bytes);
+
+    ArchiveFile? kmlFile = archive.findFile('doc.kml');
+    kmlFile ??= archive.files.firstWhere(
+      (f) => f.name.toLowerCase().endsWith('.kml'),
+      orElse: () => throw Exception('Nem található .kml fájl a KMZ-ben'),
+    );
+
+    final kmlString = String.fromCharCodes(kmlFile.content as List<int>);
+    return _parse(kmlString, fileName, LayerImportSourceType.kmz,
+        id: id, isVisible: isVisible);
+  }
+
+  // ── KML (szöveg) ──────────────────────────────────────────────────
+
+  ImportedLayer parseKml(String kmlString, String fileName,
+          {String? id, bool isVisible = true}) =>
+      _parse(kmlString, fileName, LayerImportSourceType.kml,
+          id: id, isVisible: isVisible);
+
+  // ── Belső parse ───────────────────────────────────────────────────
+
+  ImportedLayer _parse(
+      String kmlString, String fileName, LayerImportSourceType source,
+      {String? id, bool isVisible = true}) {
+    final doc = XmlDocument.parse(kmlString);
+    final markers = <Marker>[];
+    final polylines = <Polyline>[];
+    final polygons = <Polygon>[];
+
+    for (final pm in doc.findAllElements('Placemark')) {
+      final style = _style(pm);
+      final label = pm.findElements('name').firstOrNull?.innerText.trim() ?? '';
+
+      // Point
+      final point = pm.findElements('Point').firstOrNull;
+      if (point != null) {
+        final pt = _singleCoord(point);
+        if (pt != null) {
+          markers.add(Marker(
+            point: pt,
+            width: label.isNotEmpty ? 120 : 24,
+            height: label.isNotEmpty ? 40 : 24,
+            alignment: Alignment.bottomCenter,
+            child: _markerWidget(label, style.lineColor),
+          ));
+        }
+      }
+
+      // LineString
+      final line = pm.findElements('LineString').firstOrNull;
+      if (line != null) {
+        final pts = _coordList(line);
+        if (pts.isNotEmpty) {
+          polylines.add(Polyline(
+            points: pts,
+            color: style.lineColor,
+            strokeWidth: style.lineWidth,
+            borderColor: style.lineColor.withOpacity(0.3),
+            borderStrokeWidth: 1.0,
+          ));
+        }
+      }
+
+      // Polygon
+      final poly = pm.findElements('Polygon').firstOrNull;
+      if (poly != null) {
+        final rings = _polygonRings(poly);
+        if (rings.isNotEmpty) {
+          polygons.add(Polygon(
+            points: rings[0],
+            holePointsList: rings.length > 1 ? rings.sublist(1) : null,
+            color: style.fillColor,
+            borderColor: style.lineColor,
+            borderStrokeWidth: style.lineWidth,
+            label: label.isNotEmpty ? label : null,
+          ));
+        }
+      }
+
+      // MultiGeometry — rekurzív feldolgozás az első egyszerű elemre
+      final multi = pm.findElements('MultiGeometry').firstOrNull;
+      if (multi != null) {
+        for (final ls in multi.findElements('LineString')) {
+          final pts = _coordList(ls);
+          if (pts.isNotEmpty) {
+            polylines.add(Polyline(
+              points: pts,
+              color: style.lineColor,
+              strokeWidth: style.lineWidth,
+            ));
+          }
+        }
+      }
+    }
+
+    return ImportedLayer(
+      id: id ?? const Uuid().v4(),
+      isVisible: isVisible,
+      name: fileName,
+      sourceType: source,
+      markers: markers,
+      polylines: polylines,
+      polygons: polygons,
+      importedAt: DateTime.now(),
+    );
+  }
+
+  // ── Koordináta parserek ───────────────────────────────────────────
+
+  LatLng? _singleCoord(XmlElement geom) {
+    final raw = geom.findElements('coordinates').firstOrNull?.innerText.trim();
+    if (raw == null) return null;
+    return _oneCoord(raw.split(RegExp(r'\s+')).first);
+  }
+
+  List<LatLng> _coordList(XmlElement geom) {
+    final raw = geom.findElements('coordinates').firstOrNull?.innerText.trim();
+    if (raw == null) return [];
+    return raw
+        .split(RegExp(r'\s+'))
+        .map(_oneCoord)
+        .whereType<LatLng>()
+        .toList();
+  }
+
+  List<List<LatLng>> _polygonRings(XmlElement polygon) {
+    final rings = <List<LatLng>>[];
+    final outer = polygon
+        .findElements('outerBoundaryIs')
+        .firstOrNull
+        ?.findElements('LinearRing')
+        .firstOrNull;
+    if (outer != null) rings.add(_coordList(outer));
+    for (final inner in polygon.findElements('innerBoundaryIs')) {
+      final ring = inner.findElements('LinearRing').firstOrNull;
+      if (ring != null) rings.add(_coordList(ring));
+    }
+    return rings.where((r) => r.isNotEmpty).toList();
+  }
+
+  /// KML: lon,lat,alt → LatLng(lat, lon)
+  LatLng? _oneCoord(String s) {
+    final p = s.split(',');
+    if (p.length < 2) return null;
+    try {
+      return LatLng(
+        double.parse(p[1].trim()), // lat
+        double.parse(p[0].trim()), // lon
+      );
+    } catch (_) {
+      return null;
+    }
+  }
+
+  // ── Stílus kiolvasás ──────────────────────────────────────────────
+
+  _Style _style(XmlElement pm) {
+    final style = pm.findElements('Style').firstOrNull;
+    if (style == null) return _Style.defaults(this);
+
+    Color lineColor = defaultPolylineColor;
+    double lineWidth = defaultPolylineStroke;
+    Color fillColor = defaultPolygonFillColor;
+
+    final ls = style.findElements('LineStyle').firstOrNull;
+    if (ls != null) {
+      final c = ls.findElements('color').firstOrNull?.innerText;
+      if (c != null) lineColor = _kmlColor(c);
+      final w = ls.findElements('width').firstOrNull?.innerText;
+      if (w != null) lineWidth = double.tryParse(w) ?? lineWidth;
+    }
+
+    final ps = style.findElements('PolyStyle').firstOrNull;
+    if (ps != null) {
+      final c = ps.findElements('color').firstOrNull?.innerText;
+      if (c != null) fillColor = _kmlColor(c);
+    }
+
+    return _Style(
+        lineColor: lineColor, lineWidth: lineWidth, fillColor: fillColor);
+  }
+
+  /// KML szín formátum: aabbggrr → Flutter Color(argb)
+  Color _kmlColor(String s) {
+    if (s.length != 8) return defaultPolylineColor;
+    try {
+      final a = int.parse(s.substring(0, 2), radix: 16);
+      final b = int.parse(s.substring(2, 4), radix: 16);
+      final g = int.parse(s.substring(4, 6), radix: 16);
+      final r = int.parse(s.substring(6, 8), radix: 16);
+      return Color.fromARGB(a, r, g, b);
+    } catch (_) {
+      return defaultPolylineColor;
+    }
+  }
+
+  // ── Marker widget ─────────────────────────────────────────────────
+
+  Widget _markerWidget(String label, Color color) {
+    if (label.isEmpty) {
+      return Icon(Icons.location_pin, color: color, size: 24);
+    }
+    return Column(mainAxisSize: MainAxisSize.min, children: [
+      Container(
+        padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 2),
+        decoration:
+            BoxDecoration(color: color, borderRadius: BorderRadius.circular(4)),
+        child: Text(label,
+            style: const TextStyle(
+                color: Colors.white, fontSize: 10, fontWeight: FontWeight.w600),
+            overflow: TextOverflow.ellipsis),
+      ),
+      Icon(Icons.location_pin, color: color, size: 16),
+    ]);
+  }
+}
+
+class _Style {
+  final Color lineColor;
+  final double lineWidth;
+  final Color fillColor;
+  const _Style(
+      {required this.lineColor,
+      required this.lineWidth,
+      required this.fillColor});
+  factory _Style.defaults(KmlParser p) => _Style(
+        lineColor: p.defaultPolylineColor,
+        lineWidth: p.defaultPolylineStroke,
+        fillColor: p.defaultPolygonFillColor,
+      );
+}