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Update BoundingBoxTileSource.cs

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This commit is contained in:
ClemensFischer 2024-05-18 11:39:01 +02:00
parent b3abd069dd
commit b80ef6b7a2
1 changed files with 7 additions and 3 deletions
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10
MapControl/Shared/BoundingBoxTileSource.cs
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@ -13,14 +13,14 @@ namespace MapControl
{ {
public override Uri GetUri(int column, int row, int zoomLevel) public override Uri GetUri(int column, int row, int zoomLevel)
{ {
GetBounds(column, row, zoomLevel, out double west, out double south, out double east, out double north); GetTileBounds(column, row, zoomLevel, out double west, out double south, out double east, out double north);
return GetUri(west, south, east, north); return GetUri(west, south, east, north);
} }
public override Task<ImageSource> LoadImageAsync(int column, int row, int zoomLevel) public override Task<ImageSource> LoadImageAsync(int column, int row, int zoomLevel)
{ {
GetBounds(column, row, zoomLevel, out double west, out double south, out double east, out double north); GetTileBounds(column, row, zoomLevel, out double west, out double south, out double east, out double north);
return LoadImageAsync(west, south, east, north); return LoadImageAsync(west, south, east, north);
} }
@ -51,7 +51,11 @@ namespace MapControl
return uri != null ? ImageLoader.LoadImageAsync(uri) : Task.FromResult((ImageSource)null); return uri != null ? ImageLoader.LoadImageAsync(uri) : Task.FromResult((ImageSource)null);
} }
protected void GetBounds(int column, int row, int zoomLevel, out double west, out double south, out double east, out double north) /// <summary>
/// Gets the bounding box in meters of a standard Web Mercator tile, specified by grid column and row indices and zoom level.
/// </summary>
public static void GetTileBounds(int column, int row, int zoomLevel,
out double west, out double south, out double east, out double north)
{ {
var tileSize = 360d / (1 << zoomLevel); // tile size in degrees var tileSize = 360d / (1 << zoomLevel); // tile size in degrees