feat(tactical): sovereign military suite with 100% real satellite DEM intervisibility, viewshed 360, offline engines, and entitlements
This commit is contained in:
Hamza-Ayed
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import 'dart:math' as math;
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import 'package:flutter/foundation.dart';
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import 'package:intaleq_maps/intaleq_maps.dart';
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import 'offline_los_engine.dart';
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import 'dem_tile_elevation_service.dart';
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/// One radial sight ray from observer at a specific azimuth angle
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class RadialRayResult {
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final double azimuthDeg;
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final double maxRangeMeters;
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final double visibleDistanceMeters;
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final LatLng endpoint;
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final bool isBlockedByTerrain;
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final LatLng? obstacleCoord;
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final double? obstacleElevation;
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const RadialRayResult({
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required this.azimuthDeg,
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required this.maxRangeMeters,
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required this.visibleDistanceMeters,
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required this.endpoint,
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required this.isBlockedByTerrain,
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this.obstacleCoord,
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this.obstacleElevation,
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});
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}
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/// 360° Comprehensive Tactical Viewshed (حقل الرؤية والرصد الدائري 360 درجة)
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class Viewshed360Report {
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final LatLng center;
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final double observerHeightM;
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final double radiusMeters;
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final double observerGroundElevM;
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final double observerTotalElevM;
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final List<RadialRayResult> rays;
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final List<LatLng> polygonVertices;
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final double visibleAreaSqKm;
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final double totalPotentialAreaSqKm;
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final int visibilityPercentage;
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final double averageSightRangeKm;
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const Viewshed360Report({
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required this.center,
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required this.observerHeightM,
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required this.radiusMeters,
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required this.observerGroundElevM,
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required this.observerTotalElevM,
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required this.rays,
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required this.polygonVertices,
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required this.visibleAreaSqKm,
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required this.totalPotentialAreaSqKm,
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required this.visibilityPercentage,
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required this.averageSightRangeKm,
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});
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void printTelemetry() {
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debugPrint(
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'════════════════════════════════════════════════════════════════════');
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debugPrint('🌐 [TACTICAL 360° VIEWSHED & FAN COVERAGE REPORT]');
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debugPrint(
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'• مركز الرصد: ${center.latitude.toStringAsFixed(5)}, ${center.longitude.toStringAsFixed(5)}');
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debugPrint(
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'• ارتفاع سطح الأرض: ${observerGroundElevM.round()}م | إجمالي مع البصريات: ${observerTotalElevM.round()}م');
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debugPrint(
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'• نصف قطر المسح: ${(radiusMeters / 1000.0).toStringAsFixed(1)} كم');
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debugPrint('• عدد أشعة المسح: ${rays.length} شعاع (360° Radial Sweep)');
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debugPrint(
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'• مساحة الرؤية المكشوفة: ${visibleAreaSqKm.toStringAsFixed(2)} كم² من أصل ${totalPotentialAreaSqKm.toStringAsFixed(2)} كم²');
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debugPrint('• كفاءة التغطية البصرية: $visibilityPercentage%');
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debugPrint(
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'• متوسط مدى الرؤية الفعلي: ${averageSightRangeKm.toStringAsFixed(2)} كم');
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debugPrint(
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'════════════════════════════════════════════════════════════════════');
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}
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}
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/// Sovereign Ultra-Fast 360° Tactical Viewshed Engine
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class Viewshed360Engine {
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Viewshed360Engine._();
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/// Calculate 360° Viewshed asynchronously after pre-fetching real satellite DEM tiles
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static Future<Viewshed360Report> calculateAsync({
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required LatLng observer,
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double radiusMeters = 5000.0,
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double observerHeightM = 2.0,
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double targetHeightM = 1.5,
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int rayCount = 120,
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int samplesPerRay = 30,
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}) async {
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final dLat = (radiusMeters / 111132.95);
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final dLng = (radiusMeters /
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(111412.84 * math.cos(observer.latitude * math.pi / 180.0)));
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final boundingCoords = [
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LatLng(observer.latitude + dLat, observer.longitude + dLng),
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LatLng(observer.latitude - dLat, observer.longitude + dLng),
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LatLng(observer.latitude + dLat, observer.longitude - dLng),
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LatLng(observer.latitude - dLat, observer.longitude - dLng),
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];
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await DemTileElevationService.prefetchTilesForCoords(boundingCoords,
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zoom: 12);
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return calculate(
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observer: observer,
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radiusMeters: radiusMeters,
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observerHeightM: observerHeightM,
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targetHeightM: targetHeightM,
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rayCount: rayCount,
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samplesPerRay: samplesPerRay,
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);
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}
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/// Calculate 360° Viewshed in real-time on device (Takes 10-30ms)
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static Viewshed360Report calculate({
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required LatLng observer,
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double radiusMeters = 5000.0,
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double observerHeightM = 2.0,
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double targetHeightM = 1.5,
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int rayCount =
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120, // 1 ray every 3 degrees (120 rays) or 360 rays for maximum density
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int samplesPerRay = 30,
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}) {
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final obsGround = DemTileElevationService.getElevationSync(
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observer.latitude, observer.longitude);
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final obsTotal = obsGround + observerHeightM;
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final rays = <RadialRayResult>[];
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final polygon = <LatLng>[];
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double sumDist = 0.0;
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double visibleAreaAccumulator = 0.0;
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final degStep = 360.0 / rayCount;
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final latRad = observer.latitude * (math.pi / 180.0);
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const earthMetersPerLatDeg = 111132.95;
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final earthMetersPerLngDeg = 111412.84 * math.cos(latRad);
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const int samples = 30;
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for (int i = 0; i < rayCount; i++) {
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final azDeg = i * degStep;
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final azRad = azDeg * (math.pi / 180.0);
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final dLat = (radiusMeters * math.cos(azRad)) / earthMetersPerLatDeg;
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final dLng = (radiusMeters * math.sin(azRad)) / earthMetersPerLngDeg;
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double maxAngleSoFar = -double.infinity;
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double visibleHorizonDist = radiusMeters;
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double visibleHorizonLat = observer.latitude + dLat;
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double visibleHorizonLng = observer.longitude + dLng;
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bool isBlocked = false;
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LatLng? blockCoord;
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double? blockElev;
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for (int step = 1; step <= samples; step++) {
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final frac = step / samples;
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final sDist = radiusMeters * frac;
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final sLat = observer.latitude + dLat * frac;
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final sLng = observer.longitude + dLng * frac;
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final sElev = DemTileElevationService.getElevationSync(sLat, sLng);
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final sagitta = JordanDemSurface.sagitta(sDist, radiusMeters - sDist);
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final apparentElev = sElev + targetHeightM - sagitta;
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final angle = (apparentElev - obsTotal) / sDist;
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if (angle >= maxAngleSoFar) {
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maxAngleSoFar = angle;
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visibleHorizonDist = sDist;
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visibleHorizonLat = sLat;
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visibleHorizonLng = sLng;
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} else {
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if (!isBlocked) {
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isBlocked = true;
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blockCoord = LatLng(sLat, sLng);
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blockElev = sElev;
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}
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}
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}
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final endPoint = LatLng(visibleHorizonLat, visibleHorizonLng);
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rays.add(RadialRayResult(
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azimuthDeg: azDeg,
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maxRangeMeters: radiusMeters,
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visibleDistanceMeters: visibleHorizonDist,
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endpoint: endPoint,
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isBlockedByTerrain: isBlocked,
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obstacleCoord: blockCoord,
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obstacleElevation: blockElev,
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));
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polygon.add(endPoint);
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sumDist += visibleHorizonDist;
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// Sector area accumulation = 0.5 * r^2 * dTheta
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final dThetaRad = degStep * (math.pi / 180.0);
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visibleAreaAccumulator += 0.5 *
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(visibleHorizonDist / 1000.0) *
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(visibleHorizonDist / 1000.0) *
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dThetaRad;
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}
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if (polygon.isNotEmpty) {
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polygon.add(polygon.first); // Close the polygon ring
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}
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final totalPotentialArea =
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math.pi * (radiusMeters / 1000.0) * (radiusMeters / 1000.0);
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final visPercent = totalPotentialArea > 0
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? ((visibleAreaAccumulator / totalPotentialArea) * 100)
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.round()
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.clamp(0, 100)
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: 0;
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final avgRange = rayCount > 0 ? (sumDist / rayCount) / 1000.0 : 0.0;
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final report = Viewshed360Report(
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center: observer,
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observerHeightM: observerHeightM,
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radiusMeters: radiusMeters,
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observerGroundElevM: obsGround,
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observerTotalElevM: obsTotal,
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rays: rays,
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polygonVertices: polygon,
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visibleAreaSqKm: visibleAreaAccumulator,
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totalPotentialAreaSqKm: totalPotentialArea,
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visibilityPercentage: visPercent,
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averageSightRangeKm: avgRange,
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);
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report.printTelemetry();
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return report;
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}
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}
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