mirror of
https://github.com/dz0ny/meshcore-sar.git
synced 2026-08-11 16:30:28 +00:00
a4dc85d130
- Implemented WMS layer handling for Slovenian aerial imagery and overlays for cadastral parcels and forest roads. - Added distance measurement feature allowing users to measure distances on the map with long press interactions. - Updated localization files for Croatian, Italian, and Slovenian languages to include new measurement and WMS-related strings. - Enhanced the map layer model to support WMS-specific properties. - Introduced a new tile provider for debugging WMS requests. - Updated the drawing toolbar to include measurement mode and clear measurement functionality. - Integrated SharedPreferences to persist overlay visibility states across app sessions. - Added utility functions for handling the Slovenian coordinate reference system (EPSG:3794).
87 lines
3.2 KiB
Dart
87 lines
3.2 KiB
Dart
import 'dart:math' show Point;
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import 'dart:ui' show Rect;
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import 'package:flutter_map/flutter_map.dart';
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import 'package:latlong2/latlong.dart';
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import 'package:proj4dart/proj4dart.dart' as proj4;
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/// EPSG:3794 - Slovenia 1996 / Slovene National Grid
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/// Transverse Mercator projection for Slovenia
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///
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/// Official definition from https://epsg.io/3794:
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/// +proj=tmerc +lat_0=0 +lon_0=15 +k=0.9999 +x_0=500000 +y_0=-5000000
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/// +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs
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///
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/// This CRS is used by Slovenian government WMS services (prostor.zgs.gov.si)
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/// Register and get EPSG:3794 projection
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proj4.Projection getEpsg3794Projection() {
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const epsg3794Def = '+proj=tmerc +lat_0=0 +lon_0=15 +k=0.9999 '
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'+x_0=500000 +y_0=-5000000 +ellps=GRS80 '
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'+towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs';
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// Register projection if not already registered
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try {
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return proj4.Projection.get('EPSG:3794') ?? proj4.Projection.add('EPSG:3794', epsg3794Def);
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} catch (e) {
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// If already registered, get it
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return proj4.Projection.get('EPSG:3794')!;
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}
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}
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/// Create Proj4Crs for EPSG:3794
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///
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/// Configuration matches the GeoWebCache tile grid used by prostor.zgs.gov.si
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///
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/// Official tile grid from WMTS GetCapabilities:
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/// - TopLeftCorner: 373217.6542445397, 246158.298050262
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/// - Bounds: X: 373217.65 to 695777.65, Y: 31118.30 to 246158.30
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/// - Tile size: 256x256 pixels
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/// - Scale denominators converted to resolutions using: resolution = scaleDenom * 0.00028
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Crs getSlovenianCrs() {
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final projection = getEpsg3794Projection();
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// Resolutions calculated from GeoWebCache scale denominators
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// Formula: resolution (m/px) = scaleDenominator * 0.00028 (OGC standard)
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final resolutions = <double>[
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420.0, // Zoom 0 - ScaleDenom: 1500000
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280.0, // Zoom 1 - ScaleDenom: 1000000
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210.0, // Zoom 2 - ScaleDenom: 750000
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140.0, // Zoom 3 - ScaleDenom: 500000
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70.0, // Zoom 4 - ScaleDenom: 250000
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28.0, // Zoom 5 - ScaleDenom: 100000
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14.0, // Zoom 6 - ScaleDenom: 50000
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7.0, // Zoom 7 - ScaleDenom: 25000
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4.2, // Zoom 8 - ScaleDenom: 15000
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2.8, // Zoom 9 - ScaleDenom: 10000
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1.4, // Zoom 10 - ScaleDenom: 5000
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0.56, // Zoom 11 - ScaleDenom: 2000
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0.28, // Zoom 12 - ScaleDenom: 1000
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0.14, // Zoom 13 - ScaleDenom: 500
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0.07, // Zoom 14 - ScaleDenom: 250
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0.028, // Zoom 15 - ScaleDenom: 100
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];
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// Bounds from WMS capabilities (actual data extent in Slovenia)
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final bounds = Rect.fromLTRB(
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373217.65, // min X (west)
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31118.30, // min Y (south) - top in Rect coordinates
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695777.65, // max X (east)
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246158.30, // max Y (north) - bottom in Rect coordinates
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);
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// Origin from WMTS TileMatrixSet TopLeftCorner
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// This is the top-left corner of the tile pyramid (min X, max Y)
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final origin = Point<double>(373217.6542445397, 246158.298050262);
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return Proj4Crs.fromFactory(
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code: 'EPSG:3794',
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proj4Projection: projection,
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resolutions: resolutions,
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bounds: bounds,
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origins: [origin],
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);
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}
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/// Singleton instance of Slovenian CRS for reuse
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final Crs slovenianCrs = getSlovenianCrs();
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