/// <summary>
/// Read the statistic and dynamic information from the file. checked.
/// </summary>
/// <returns></returns>
private async Task <InfoPack> GetBoardInfo(int stageIndex)
{
MyPoint player = new MyPoint(-1, -1);
List <MyPoint> boxes = new List <MyPoint>();
List <MyPoint> targets = new List <MyPoint>();
GridType[,] gridMatrix;
BoardInfo info;
GameEngine engine;
try
{
var uri = new Uri(String.Format("ms-appx:///Assets/Stages/{0:G}.txt", stageIndex));
var file = await StorageFile.GetFileFromApplicationUriAsync(uri).AsTask().ConfigureAwait(false);
var encoding = Encoding.GetEncoding("utf-8");
using (Stream stream = await file.OpenStreamForReadAsync())
{
using (StreamReader reader = new StreamReader(stream, encoding, false))
{
string line = reader.ReadLine();
if (line == null)
{
throw new FileLoadException("Wrong Stage File Format.");
}
string[] numStrings = line.Split(' ');
int rowNum = Convert.ToInt32(numStrings[0], 10);
int columnCount = Convert.ToInt32(numStrings[1], 10);
gridMatrix = new GridType[rowNum, columnCount];
for (int i = 0; i < rowNum; i++)
{
line = reader.ReadLine();
if (line == null)
{
throw new FileLoadException("Wrong Stage File Line Format.");
}
if (line.Length != columnCount)
{
throw new FileLoadException("Wrong Stage File Line Format.");
}
for (int j = 0; j < columnCount; j++)
{
gridMatrix[i, j] = BlockCode[line[j]];
if (line[j] == '@')
{
// player
player.Y = i;
player.X = j;
// i is row index -- y
// j is column index -- x
}
else if (line[j] == '$')
{
// box
var box = new MyPoint(j, i);
boxes.Add(box);
}
else if (line[j] == '*')
{
// red box
var box = new MyPoint(j, i);
boxes.Add(box);
var target = new MyPoint(j, i);
targets.Add(target);
}
else if (line[j] == '.')
{
// target list: only for the AI.
var target = new MyPoint(j, i);
targets.Add(target);
}
}
}
if (player.X < 0 || player.Y < 0)
{
throw new FileLoadException("No Player Position in Stage File.");
}
info = new BoardInfo(player, boxes);
engine = new GameEngine(gridMatrix, targets);
}
}
return(new InfoPack(info, engine));
}
catch (Exception e)
{
var message = "The file could not be read:";
message += e.Message;
PathText.Text = message;
return(null);
}
}
/// <summary>
/// Manhatton distance of two points.
/// </summary>
/// <param name="p1"></param>
/// <param name="p2"></param>
/// <returns></returns>
private int Manhatton(MyPoint p1, MyPoint p2)
{
return(Math.Abs(p1.X - p2.X) + Math.Abs(p1.Y - p2.Y));
}