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Offline areas download an extra ring of tiles at each zoom level

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stopflock
2025-08-11 01:35:11 -05:00
parent f5a831ab12
commit fa3b8b3456
3 changed files with 43 additions and 10 deletions
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lib/services/offline_areas/offline_tile_utils.dart
+10 -6
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@@ -22,12 +22,16 @@ Set<List<int>> computeTileList(LatLngBounds bounds, int zMin, int zMax) {
}
for (int z = zMin; z <= zMax; z++) {
final n = pow(2, z).toInt();
final minTile = latLonToTile(latMin, lonMin, z);
final maxTile = latLonToTile(latMax, lonMax, z);
final minX = min(minTile[0], maxTile[0]);
final maxX = max(minTile[0], maxTile[0]);
final minY = min(minTile[1], maxTile[1]);
final maxY = max(minTile[1], maxTile[1]);
final minTileRaw = latLonToTileRaw(latMin, lonMin, z);
final maxTileRaw = latLonToTileRaw(latMax, lonMax, z);
int minX = min(minTileRaw[0].floor(), maxTileRaw[0].floor()) - 1;
int maxX = max(minTileRaw[0].ceil() - 1, maxTileRaw[0].ceil() - 1) + 1;
int minY = min(minTileRaw[1].floor(), maxTileRaw[1].floor()) - 1;
int maxY = max(minTileRaw[1].ceil() - 1, maxTileRaw[1].ceil() - 1) + 1;
minX = minX.clamp(0, n - 1);
maxX = maxX.clamp(0, n - 1);
minY = minY.clamp(0, n - 1);
maxY = maxY.clamp(0, n - 1);
for (int x = minX; x <= maxX; x++) {
for (int y = minY; y <= maxY; y++) {
tiles.add([z, x, y]);