/// <summary>
/// Wrties a <see cref="SavedGame"/> object to a specific file.
/// </summary>
/// <param name="savedGame">An object storing the information about the saved game.</param>
/// <param name="fileName">The name of the file which the saved game should be written to.
/// </param>
private static void SaveToFile(SavedGame savedGame, string fileName)
{
// Get raw saved game XML document
XDocument savedGameXml;
using (var stream = new MemoryStream())
{
var xmlSerializer = new XmlSerializer(typeof(SavedGame));
xmlSerializer.Serialize(stream, savedGame);
stream.Position = 0;
savedGameXml = XDocument.Load(stream);
}
// Compute hash on the raw saved game XML document and append it to the document
string base64Hash = GetSavedGameHash(savedGameXml);
var hashElement = new XElement(HashElementName, base64Hash);
savedGameXml.Root.Add(hashElement);
// Compress the saved game XML document and write it to the specified file
using (FileStream fileStream = File.Create(fileName))
using (var compressionStream = new DeflateStream(fileStream, CompressionMode.Compress))
{
savedGameXml.Save(compressionStream, SaveOptions.DisableFormatting);
}
}
/// <summary>
/// Saves a game to a file chosen by the user.
/// </summary>
/// <param name="game">The game to be saved.</param>
/// <returns><see langword="true"/> if the user has chosen to save the game and the saved
/// game file has been created successfully.</returns>
public static bool SaveGame(Game game)
{
string fileName;
if (!PromptForFileToSave(out fileName))
return false;
// Create saved vertex objects
var savedVertices = new Dictionary<ViewModels.Vertex, Vertex>();
int idCounter = 0;
foreach (ViewModels.Vertex vertex in game.Level.GameObjects.OfType<ViewModels.Vertex>())
{
var savedVertex = new Vertex
{
Id = idCounter++,
X = vertex.X,
Y = vertex.Y,
};
savedVertices[vertex] = savedVertex;
}
// Attach connected vertex IDs to saved vertex objects
foreach (KeyValuePair<ViewModels.Vertex, Vertex> pair in savedVertices)
{
pair.Value.ConnectedVertexIds = pair.Key.ConnectedVertices
.Select(d => savedVertices[d].Id)
.ToArray();
}
// Create saved game objects
var savedGame = new SavedGame
{
Version = CurrentVersion,
CreationDate = DateTime.Now,
LevelNumber = game.LevelNumber,
VertexCount = game.Level.VertexCount,
IntersectionCount = game.Level.IntersectionCount,
Vertices = savedVertices.Values.ToArray(),
};
// Save the saved game object to the specified file
SaveToFile(savedGame, fileName);
return true;
}
