Proj4 refraktorálás a CoordConverterService osztályba. MapController refraktorálás.

2026-05-09 22:04:14 +02:00
parent 7ee47e65bd
commit 81f1fa5cd7
3 changed files with 46 additions and 19 deletions
@@ -0,0 +1,37 @@
+import 'package:flutter/services.dart';
+import 'package:get/get.dart';
+import 'package:proj4dart/proj4dart.dart' as proj4;
+
+class CoordConverterService extends GetxService {
+  static CoordConverterService get to => Get.find();
+
+  late proj4.Projection eovProj;
+  late proj4.Projection wgsProj;
+
+  @override
+  Future<void> onInit() async {
+    super.onInit();
+
+    final bytes = (await rootBundle.load('assets/Grids/etrs2eov_notowgs.gsb'))
+        .buffer
+        .asUint8List();
+
+    proj4.Projection.nadgrid('Etrs2Eov', bytes);
+
+    const def =
+        '+proj=somerc +lat_0=47.14439372222222 +lon_0=19.04857177777778 '
+        '+k_0=0.99993 +x_0=650000 +y_0=200000 +ellps=GRS67 '
+        '+towgs84=52.17,-71.82,-14.9,0,0,0,0 '
+        '+units=m +nadgrids=Etrs2Eov +no_defs';
+
+    eovProj = proj4.Projection.add('EPSG:23700', def);
+    wgsProj = proj4.Projection.WGS84;
+  }
+
+  // Segédmetódusok — nem kötelező, de tisztább
+  proj4.Point wgsToEovPoint(double lon, double lat) =>
+      wgsProj.transform(eovProj, proj4.Point(x: lon, y: lat));
+
+  proj4.Point eovToWgsPoint(double y, double x) =>
+      eovProj.transform(wgsProj, proj4.Point(x: y, y: x));
+}