/// <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 = ((this.Pixels + offset) * scale) - offset; // Bias new location on the offset
_mapSize = TileGenerator.GetSize(zoom);
_maximumTile = (int)((_mapSize - _size) / TileGenerator.TileSize);
this.Translate(this.Pixels - location);
}
}
/// <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(this.ActualHeight / height), TileGenerator.GetZoom(this.ActualWidth / width));
// todo, hacer un combinador o algo asi.
Debug.WriteLine(String.Format("CenterSize: aw={0} ah={1} l={2} r={3} t={4} b={5} h={6} w={7} z={8} lat={9} lon={10}",
(int)this.ActualWidth, (int)this.ActualHeight,
left, right, top,
bottom, height, width,
zoom, latitude, longitude));
this.Center(latitude, longitude, zoom);
}