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feat: MeshCore SAR - Flutter BLE mesh radio companion app

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Janez T
2026-02-28 10:11:33 +01:00
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lib/utils/slovenian_crs.dart Normal file
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import 'dart:math' show Point;
import 'dart:ui' show Rect;
import 'package:flutter_map/flutter_map.dart';
import 'package:proj4dart/proj4dart.dart' as proj4;
/// EPSG:3794 - Slovenia 1996 / Slovene National Grid
/// Transverse Mercator projection for Slovenia
///
/// Official definition from https://epsg.io/3794:
/// +proj=tmerc +lat_0=0 +lon_0=15 +k=0.9999 +x_0=500000 +y_0=-5000000
/// +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs
///
/// This CRS is used by Slovenian government WMS services (prostor.zgs.gov.si)
/// Register and get EPSG:3794 projection
proj4.Projection getEpsg3794Projection() {
const epsg3794Def =
'+proj=tmerc +lat_0=0 +lon_0=15 +k=0.9999 '
'+x_0=500000 +y_0=-5000000 +ellps=GRS80 '
'+towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs';
// Register projection if not already registered
try {
return proj4.Projection.get('EPSG:3794') ??
proj4.Projection.add('EPSG:3794', epsg3794Def);
} catch (e) {
// If already registered, get it
return proj4.Projection.get('EPSG:3794')!;
}
}
/// Create Proj4Crs for EPSG:3794
///
/// Configuration matches the GeoWebCache tile grid used by prostor.zgs.gov.si
///
/// Official tile grid from WMTS GetCapabilities:
/// - TopLeftCorner: 373217.6542445397, 246158.298050262
/// - Bounds: X: 373217.65 to 695777.65, Y: 31118.30 to 246158.30
/// - Tile size: 256x256 pixels
/// - Scale denominators converted to resolutions using: resolution = scaleDenom * 0.00028
Crs getSlovenianCrs() {
final projection = getEpsg3794Projection();
// Resolutions calculated from GeoWebCache scale denominators
// Formula: resolution (m/px) = scaleDenominator * 0.00028 (OGC standard)
final resolutions = <double>[
420.0, // Zoom 0 - ScaleDenom: 1500000
280.0, // Zoom 1 - ScaleDenom: 1000000
210.0, // Zoom 2 - ScaleDenom: 750000
140.0, // Zoom 3 - ScaleDenom: 500000
70.0, // Zoom 4 - ScaleDenom: 250000
28.0, // Zoom 5 - ScaleDenom: 100000
14.0, // Zoom 6 - ScaleDenom: 50000
7.0, // Zoom 7 - ScaleDenom: 25000
4.2, // Zoom 8 - ScaleDenom: 15000
2.8, // Zoom 9 - ScaleDenom: 10000
1.4, // Zoom 10 - ScaleDenom: 5000
0.56, // Zoom 11 - ScaleDenom: 2000
0.28, // Zoom 12 - ScaleDenom: 1000
0.14, // Zoom 13 - ScaleDenom: 500
0.07, // Zoom 14 - ScaleDenom: 250
0.028, // Zoom 15 - ScaleDenom: 100
];
// Bounds from WMS capabilities (actual data extent in Slovenia)
final bounds = Rect.fromLTRB(
373217.65, // min X (west)
31118.30, // min Y (south) - top in Rect coordinates
695777.65, // max X (east)
246158.30, // max Y (north) - bottom in Rect coordinates
);
// Origin from WMTS TileMatrixSet TopLeftCorner
// This is the top-left corner of the tile pyramid (min X, max Y)
final origin = Point<double>(373217.6542445397, 246158.298050262);
return Proj4Crs.fromFactory(
code: 'EPSG:3794',
proj4Projection: projection,
resolutions: resolutions,
bounds: bounds,
origins: [origin],
);
}
/// Singleton instance of Slovenian CRS for reuse
final Crs slovenianCrs = getSlovenianCrs();