/// <summary>
/// Operate the move according to Operation o and dynamic info.
/// </summary>
/// <param name="o">Movement</param>
/// <param name="info">Dynamic info</param>
/// <returns>Whether the operation is available.</returns>
public bool PlayerOperate(PlayerOperation o, BoardInfo info)
{
// Prepare variables.
int rowNum = RowNum;
int columnNum = ColumnNum;
int playerX = info.Player.X;
int playerY = info.Player.Y;
int nxtY = -1;
int nxtX = -1;
int altY = -1;
int altX = -1;
bool hasAlternateGrid = false;
switch (o)
{
case PlayerOperation.Up:
{
if (playerY == 0)
{
return(false);
}
nxtY = playerY - 1;
nxtX = playerX;
altY = playerY - 2;
altX = playerX;
hasAlternateGrid = (playerY > 1);
break;
}
case PlayerOperation.Down:
{
if (playerY == rowNum - 1)
{
return(false);
}
nxtY = playerY + 1;
nxtX = playerX;
altY = playerY + 2;
altX = playerX;
hasAlternateGrid = (playerY < rowNum - 2);
break;
}
case PlayerOperation.Left:
{
if (playerX == 0)
{
return(false);
}
nxtY = playerY;
nxtX = playerX - 1;
altY = playerY;
altX = playerX - 2;
hasAlternateGrid = (playerX > 1);
break;
}
case PlayerOperation.Right:
{
if (playerX == columnNum - 1)
{
return(false);
}
nxtY = playerY;
nxtX = playerX + 1;
altY = playerY;
altX = playerX + 2;
hasAlternateGrid = (playerX < columnNum - 2);
break;
}
}
// Logic Judgement.
// next is brick
if (GridMatrix[nxtY, nxtX] == GridType.Brick)
{
return(false);
}
// next is not brick
else if (GridMatrix[nxtY, nxtX] == GridType.Ground || GridMatrix[nxtY, nxtX] == GridType.Target)
{
if (!hasAlternateGrid)
{
throw new Exception("Map data invalid error.");
}
if (GridMatrix[altY, altX] == GridType.OutSide)
{
throw new Exception("Map data invalid error.");
}
// Search if there is a box to move.
foreach (var box in info.Boxes)
{
if (nxtY == box.Y && nxtX == box.X)
{
// alternate grid is brick
if (GridMatrix[altY, altX] == GridType.Brick)
{
return(false);
}
else
{
// if alternate grid has a box, cannot move.
foreach (var boxB in info.Boxes)
{
if (boxB.Y == altY && boxB.X == altX)
{
return(false);
}
}
// now the box could be moved.
box.Y = altY;
box.X = altX;
break;
}
}
}
;
// Move the player.
info.Player.Y = nxtY;
info.Player.X = nxtX;
return(true);
}
// wrong GameState
else
{
throw new Exception("Map Data damaged.");
}
}
public InfoPack(BoardInfo info, GameEngine engine)
{
Info = info;
Engine = engine;
}
public void SetStartBoard(BoardInfo info, GameEngine engine)
{
GameState startState = new GameState(info);
PBP = new PushBoxProblem(startState, engine);
}
/// <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);
}
}
public GameState(BoardInfo info)
{
this.Info = (BoardInfo)info.Clone();
this.DistanceCost = -1;
this.PathCost = -1;
}