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feat: Enhance advertisement location history management with location dithering

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Janez T
2025-10-28 11:07:27 +01:00
parent e7fe700fee
commit 1249f39ac2
1 changed files with 13 additions and 8 deletions
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21
lib/models/contact.dart
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@@ -267,18 +267,23 @@ class Contact {
return 0; // 5+ hops
}
/// Add a new advertisement location to history (maintains max 100 points)
/// Add a new advertisement location to history (maintains max 1000 points)
///
/// Implements location dithering to avoid storing redundant points:
/// - Only stores points that are ≥1 meter apart (max meter accuracy)
/// - Prevents trail clutter when contact is stationary or moving slowly
/// - Maintains chronological order (most recent first)
Contact addAdvertLocation(LatLng location, DateTime timestamp) {
final newPoint = AdvertLocation(location: location, timestamp: timestamp);
// Check if this location is significantly different from the last one
// (avoid duplicate points for stationary contacts)
// Dithering: Skip points within 1 meter of the last recorded position
// This provides max meter accuracy while avoiding redundant data
if (advertHistory.isNotEmpty) {
final lastPoint = advertHistory.first;
final distance = _calculateDistance(lastPoint.location, location);
// If less than 5 meters apart and within 1 minute, skip
if (distance < 5 && timestamp.difference(lastPoint.timestamp).inSeconds < 60) {
// If less than 1 meter apart, skip this point (location dithering)
if (distance < 1.0) {
return this;
}
}
@@ -286,9 +291,9 @@ class Contact {
// Add new point at the beginning (most recent first)
final updatedHistory = [newPoint, ...advertHistory];
// Keep only the most recent 100 points
final trimmedHistory = updatedHistory.length > 100
? updatedHistory.sublist(0, 100)
// Keep only the most recent 1000 points to limit memory usage
final trimmedHistory = updatedHistory.length > 1000
? updatedHistory.sublist(0, 1000)
: updatedHistory;
return copyWith(advertHistory: trimmedHistory);