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cc3c227d2d
* chore: surface-area parity audit vs qibla-js, bump to v1.0.1 Full gap analysis: qibla-dart already matches @acamarata/qibla on all five public functions (qiblaAngle, compassDir, compassName, qiblaGreatCircle, distanceKm) and three constants (kaabaLat, kaabaLng, earthRadiusKm). No runtime gaps found; 48/48 tests pass unchanged. Patch bump documents the audit and closes T-E10-01 (Mega Phase 1). * docs: add CHANGELOG.md for v1.0.1 release * chore: polish pubspec, add wiki docs
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1.3 KiB
Advanced Usage
Great-Circle Path
Compute N interpolated waypoints along the great-circle route from your location to the Ka'bah:
import 'package:qibla/qibla.dart';
void main() {
// 5 waypoints from New York to Makkah
final path = greatCirclePath(40.7128, -74.0060, kaabaLat, kaabaLng, 5);
for (final point in path) {
print('${point.latitude.toStringAsFixed(4)}, ${point.longitude.toStringAsFixed(4)}');
}
}
The path uses spherical linear interpolation (Slerp) and returns n evenly spaced coordinates including the start and end points.
Custom Destination
distanceKm and greatCirclePath work with any two points, not just the Ka'bah:
// Distance between two mosques
final km = distanceKm(51.5074, -0.1278, 40.7128, -74.0060);
print('London to New York: ${km.toStringAsFixed(0)} km');
// Path from Istanbul to Makkah
final path = greatCirclePath(41.0082, 28.9784, kaabaLat, kaabaLng, 10);
Flutter Compass Widget Integration
import 'package:qibla/qibla.dart';
// In a StatefulWidget with device compass heading:
Widget buildQiblaArrow(double deviceHeading, double lat, double lng) {
final qibla = qiblaAngle(lat, lng);
final arrowRotation = (qibla - deviceHeading) * (pi / 180);
return Transform.rotate(
angle: arrowRotation,
child: const Icon(Icons.navigation, size: 48),
);
}