// Check if a tile is covered by other tiles with a smaller zoom
private bool IsCoveredByLargerTile(int zoomLevel, int tileX, int tileY, int tileZ)
{
tileZ--;
tileX /= 2;
tileY /= 2;
return(tilesMap.ContainsKey(MapTileId.ToId(tileX, tileY, zoomLevel, layerId)) || (zoomLevel < tileZ && IsCoveredByLargerTile(zoomLevel, tileX, tileY, tileZ)));
}
private bool IsCoveredBySmallerTile(int zoomLevel, int tileX, int tileY, int tileZ)
{
var id = MapTileId.ToId(tileX, tileY, tileZ, layerId);
return(tilesMap.ContainsKey(id) ||
(zoomLevel == tileZ && !requestedTiles.Contains(id)) ||
(zoomLevel > tileZ && IsCoveredBySmallerTiles(zoomLevel, tileX, tileY, tileZ)));
}
private void CleanUpOldTiles(int mapZoomLevel, MapTileBounds mapBounds)
{
// Remove tiles that are 3 levels higher than current zoom level
int mapZoomLevelThreshold = mapZoomLevel - MaxZoomLevelDifference;
MapTileId anchorId = map.Anchor;
float anchorScale = map.TilesToUnits;
Vector2 anchorOffset = map.AnchorOffsetInUnits;
for (int i = oldTilesList.Count - 1; i >= 0; i--)
{
var tileId = oldTilesList[i].Id;
if (tilesMap.ContainsKey(MapTileId.ToId(tileId.X, tileId.Y, tileId.Z, layerId)))
{
RemoveTile(oldTilesMap, oldTilesList, i);
}
else
{
// Calculate the tile bounds in the map's zoom level
float toMapZoom = Mathf.Pow(2, mapZoomLevel - tileId.Z);
int tileWest = (int)(tileId.X * toMapZoom);
int tileEast = (int)((tileId.X + 1) * toMapZoom);
int tileNorth = (int)(tileId.Y * toMapZoom);
int tileSouth = (int)((tileId.Y + 1) * toMapZoom);
bool inFrustum = tileEast > mapBounds.West && tileWest <mapBounds.East &&
tileSouth> mapBounds.North && tileNorth < mapBounds.South;
if (!inFrustum || tileId.Z < mapZoomLevelThreshold)
{
RemoveTile(oldTilesMap, oldTilesList, i);
}
else if (tileId.Z != mapZoomLevel)
{
if ((tileId.Z > mapZoomLevel && IsCoveredByLargerTile(mapZoomLevel, tileId.X, tileId.Y, tileId.Z)) ||
(tileId.Z < mapZoomLevel && IsCoveredBySmallerTiles(mapZoomLevel, tileId.X, tileId.Y, tileId.Z)))
{
RemoveTile(oldTilesMap, oldTilesList, i);
}
else
{
MapTile tile = oldTilesList[i];
tile.UpdateTile(anchorId, anchorScale, anchorOffset, Mathf.Pow(2, map.zoom - tile.ZoomLevel), 0.0001f);
}
}
else
{
MapTile tile = oldTilesList[i];
tile.UpdateTile(anchorId, anchorScale, anchorOffset, Mathf.Pow(2, map.zoom - tile.ZoomLevel), 0.0001f);
}
}
}
}
public override void SaveToBookmark(BinaryWriter bw, string bookmarkPath)
{
bw.Write(longitude);
bw.Write(latitude);
bw.Write(zoom);
bw.Write(zoomLevel);
bw.Write(tilesToUnits);
bw.Write(unitsToTiles);
bw.Write(pixelsToUnits);
bw.Write(unitsToPixels);
bw.Write(unitsToMeters);
bw.Write(metersToUnits);
bw.Write(currentLevel);
bw.Write(currentMeters.x);
bw.Write(currentMeters.y);
bw.Write(viewBounds.x);
bw.Write(viewBounds.y);
bw.Write(viewBounds.width);
bw.Write(viewBounds.height);
bw.Write(mapCoordBounds.west);
bw.Write(mapCoordBounds.east);
bw.Write(mapCoordBounds.north);
bw.Write(mapCoordBounds.south);
bw.Write(mapTileBounds.West);
bw.Write(mapTileBounds.East);
bw.Write(mapTileBounds.North);
bw.Write(mapTileBounds.South);
bw.Write(anchor.ToId());
bw.Write(anchorOffsetInUnits.x);
bw.Write(anchorOffsetInUnits.y);
}
