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Update MapTileLayer.cs

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ClemensFischer 2025-08-22 18:50:22 +02:00
parent 6742149599
commit 22abd459b3
1 changed files with 11 additions and 8 deletions
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19
MapControl/Shared/MapTileLayer.cs
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@ -195,16 +195,19 @@ namespace MapControl
? Math.Max(TileMatrix.ZoomLevel - MaxBackgroundLevels, MinZoomLevel)
: maxZoomLevel;
for (var z = minZoomLevel; z <= maxZoomLevel; z++)
for (var zoomLevel = minZoomLevel; zoomLevel <= maxZoomLevel; zoomLevel++)
{
var numTiles = 1 << z;
var tileSize = 1 << (TileMatrix.ZoomLevel - z);
var xMin = (int)Math.Floor((double)TileMatrix.XMin / tileSize); // may be negative
var xMax = TileMatrix.XMax / tileSize; // may be greater than numTiles-1
var yMin = Math.Max(TileMatrix.YMin / tileSize, 0);
var yMax = Math.Min(TileMatrix.YMax / tileSize, numTiles - 1);
var tileCount = 1 << zoomLevel; // per row and column
tiles.FillMatrix(Tiles, z, xMin, yMin, xMax, yMax, numTiles);
// Right-shift divides with rounding down also negative values, https://stackoverflow.com/q/55196178
//
var shift = TileMatrix.ZoomLevel - zoomLevel;
var xMin = TileMatrix.XMin >> shift; // may be < 0
var xMax = TileMatrix.XMax >> shift; // may be >= tileCount
var yMin = Math.Max(TileMatrix.YMin >> shift, 0);
var yMax = Math.Min(TileMatrix.YMax >> shift, tileCount - 1);
tiles.FillMatrix(Tiles, zoomLevel, xMin, yMin, xMax, yMax, tileCount);
}
}
}