/// <summary>
/// Centers the map on the specified coordinates, calculating the required zoom level.
/// </summary>
/// <param name="latitude">The latitude cooridinate.</param>
/// <param name="longitude">The longitude coordinates.</param>
/// <param name="size">The minimum size that must be visible, centered on the coordinates.</param>
public void Center(double latitude, double longitude, Size size)
{
double left = _tileGenerator.GetTileX(longitude - size.Width / 2.0, 0);
double right = _tileGenerator.GetTileX(longitude + size.Width / 2.0, 0);
double top = _tileGenerator.GetTileY(latitude - size.Height / 2.0, 0);
double bottom = _tileGenerator.GetTileY(latitude + size.Height / 2.0, 0);
double height = (top - bottom) * TileGenerator.TileSize;
double width = (right - left) * TileGenerator.TileSize;
int zoom = Math.Min(_tileGenerator.GetZoom(ActualHeight / height), _tileGenerator.GetZoom(ActualWidth / width));
Center(latitude, longitude, zoom);
}
/// <summary>
/// Updates the starting tile index based on the zoom level.
/// </summary>
/// <param name="zoom">The zoom level.</param>
/// <param name="offset">The distance from the edge to keep the same when changing zoom.</param>
public void ChangeZoom(int zoom, double offset)
{
int currentZoom = _tileGenerator.GetZoom(_mapSize / TileGenerator.TileSize);
if (currentZoom != zoom)
{
_animating = false;
double scale = Math.Pow(2, zoom - currentZoom); // 2^delta
double location = ((Pixels + offset) * scale) - offset; // Bias new location on the offset
_mapSize = _tileGenerator.GetSize(zoom);
_maximumTile = (int)((_mapSize - _size) / TileGenerator.TileSize);
Translate(Pixels - location);
}
}
