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postit: tolerate nearby rdv map cache hits

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This commit is contained in:
Paul Schneider 2026-09-06 17:25:10 +01:00
commit 247c100344
Signed by: notazof
GPG key ID: 1DD5D838E5343B06
2 changed files with 44 additions and 2 deletions
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30
src/PostIt/PostIt.Tests/RdvPageTests.cs Normal file
View file

@ -0,0 +1,30 @@
using PostIt.Views.Commands;
namespace PostIt.Tests;
public class RdvPageTests
{
[Fact]
public void AreCoordinatesClose_returns_true_for_nearby_points_within_cache_tolerance()
{
var result = RdvPage.AreCoordinatesClose(
48.8566,
2.3522,
48.85665,
2.35225);
Assert.True(result);
}
[Fact]
public void AreCoordinatesClose_returns_false_for_points_outside_cache_tolerance()
{
var result = RdvPage.AreCoordinatesClose(
48.8566,
2.3522,
48.85685,
2.3522);
Assert.False(result);
}
}

16
src/PostIt/PostIt/Views/Commands/RdvPage.axaml.cs
View file

@ -22,6 +22,7 @@ public partial class RdvPage : ContentPage
private const double DefaultLongitude = 2.3522;
private const int DefaultZoomLevel = 4;
private const int SelectedZoomLevel = 13;
internal const double ReverseGeocodingCacheToleranceDegrees = 0.0001;
private static readonly TimeSpan ReverseGeocodingDebounce = TimeSpan.FromMilliseconds(350);
private MapControl? _locationMap;
@ -183,8 +184,9 @@ public partial class RdvPage : ContentPage
private async Task TryResolveAddressAsync(RdvViewModel vm, double latitude, double longitude)
{
if (_lastResolvedLatitude == latitude
&& _lastResolvedLongitude == longitude
if (_lastResolvedLatitude.HasValue
&& _lastResolvedLongitude.HasValue
&& AreCoordinatesClose(_lastResolvedLatitude.Value, _lastResolvedLongitude.Value, latitude, longitude)
&& !string.IsNullOrWhiteSpace(_lastResolvedAddress))
{
vm.ApplyResolvedAddress(_lastResolvedAddress);
@ -221,4 +223,14 @@ public partial class RdvPage : ContentPage
vm.IsResolvingAddress = false;
}
}
internal static bool AreCoordinatesClose(
double latitudeA,
double longitudeA,
double latitudeB,
double longitudeB)
{
return Math.Abs(latitudeA - latitudeB) <= ReverseGeocodingCacheToleranceDegrees
&& Math.Abs(longitudeA - longitudeB) <= ReverseGeocodingCacheToleranceDegrees;
}
}