protected override void PlaceTile(UnwrappedTileId tileId, UnityTile tile, IMapReadable map)
{
//get the tile covering the center (Unity 0,0,0) of current extent
UnwrappedTileId centerTile = TileCover.WebMercatorToTileId(map.CenterMercator, _map.Zoom);
//get center WebMerc corrdinates of tile covering the center (Unity 0,0,0)
Vector2d centerTileCenter = Conversions.TileIdToCenterWebMercator(centerTile.X, centerTile.Y, _map.Zoom);
//calculate distance between WebMerc center coordinates of center tile and WebMerc coordinates exactly at center
Vector2d shift = map.CenterMercator - centerTileCenter;
var unityTileSize = map.UnityTileSize;
// get factor at equator to avoid shifting errors at higher latitudes
float factor = Conversions.GetTileScaleInMeters(0f, _map.Zoom) * 256 / unityTileSize;
Vector3 unityTileScale = new Vector3(unityTileSize, 1, unityTileSize);
//position the tile relative to the center tile of the current viewport using the tile id
//multiply by tile size Unity units (unityTileScale)
//shift by distance of current viewport center to center of center tile
Vector3 position = new Vector3(
(tileId.X - centerTile.X) * unityTileSize - (float)shift.x / factor
, 0
, (centerTile.Y - tileId.Y) * unityTileSize - (float)shift.y / factor);
tile.transform.localPosition = position;
tile.transform.localScale = unityTileScale;
}
