private async Task <TBitmap> FetchBitmap(BitmapTile tile, IList <BitmapTile> tilesList)
{
TRawBitmap rawBitmap = await _tileLayer.GetTileBitmap(tile.Tile);
if (rawBitmap != null)
{
tilesList.Remove(tile);
}
return(rawBitmap == null ? null : ReadBitmap(rawBitmap));
}
public BitmapSize?GetOffsetFromCoordinates(MapPoint coordinates)
{
BitmapTile targetTile = _collection.FirstOrDefault(tile => tile.ContainsCoordinates(coordinates));
if (targetTile == null)
{
return(null);
}
BitmapRect bounds = GetSquareBitmapBounds(targetTile.Tile);
BitmapSize tileOffset = targetTile.GetOffsetFromCoordinates(coordinates, _totalSize, _zoom);
return(new BitmapSize(bounds.Left + tileOffset.Width, bounds.Top + tileOffset.Height));
//return targetTile == null ? null : (BitmapSize?)targetTile.GetOffsetFromCoordinates(coordinates, _totalSize, _zoom);
}
public MapPoint?MoveCenterForView(float xOffset, float yOffset)
{
BitmapTile tile = _collection.FirstOrDefault() ?? EnumerateBitmapTiles().FirstOrDefault();
if (tile == null || tile.Bounds.Width * tile.Bounds.Height == 0)
{
return(null);
}
double correctionScale = Math.Pow(2.0, _zoom - tile.Tile.Zoom);
MapVector size = tile.Tile.GetActualSquare().Size;
double xScale = size.LongitudeOffset / (double)_tileSize.Width / correctionScale;
double yScale = size.LatitudeOffset / (double)_tileSize.Height / correctionScale;
double longitudeOffset = xScale * xOffset;
double latitudeOffset = yScale * yOffset;
_center = new MapPoint(_center.Latitude - latitudeOffset, _center.Longitude + longitudeOffset);
return(_center);
}
