//--------------------------------------
//Functions
public void Initialize()
{
//initialize random
Global.rand = new Random();
snakeHead = new TablePos(15, 15);
snakeTail.Clear();
snakeTail.Add(new TablePos(15, 16));
//fill level with empty cells
for (int r = 0; r < Global.kLevelRows; r++)
{
for (int c = 0; c < Global.kLevelColumns; c++)
{
levelData[r, c] = "cell_empty";
}
}
//add snake head and tail to level
levelData[snakeHead.row, snakeHead.column] = "snake_head";
levelData[snakeTail[0].row, snakeTail[0].column] = "snake_tail";
snakeHeadDir = Direction.Up;
//place first food
placeFood();
}
public void MoveSnake()
{
snakeDir = snakeHeadDir;
var raise = false;
//check forward cell
var dir = new TablePos();
switch (snakeDir)
{
case Direction.Up: dir.column--; break;
case Direction.Down: dir.column++; break;
case Direction.Left: dir.row--; break;
case Direction.Right: dir.row++; break;
}
if (snakeHead.row + dir.row >= Global.kLevelRows ||
snakeHead.row + dir.row < 0 ||
snakeHead.column + dir.column >= Global.kLevelColumns ||
snakeHead.column + dir.column < 0)
{
m_game.LoseGame();
return;
}
string dirCell = levelData[snakeHead.row + dir.row, snakeHead.column + dir.column];
switch (dirCell)
{
case "cell_food":
raise = true;
break;
case "cell_empty":
raise = false;
break;
default:
m_game.LoseGame();
return;
}
//delete last tail if is not eating
if (!raise)
{
TablePos lastPos = snakeTail[snakeTail.Count - 1];
levelData[lastPos.row, lastPos.column] = "cell_empty";
snakeTail.RemoveAt(snakeTail.Count - 1);
}
else
{
placeFood();
}
//turn head into tail
snakeTail.Insert(0, new TablePos(snakeHead.row, snakeHead.column));
//move head
snakeHead.column += dir.column;
snakeHead.row += dir.row;
levelData[snakeHead.row, snakeHead.column] = "snake_head";
//redraw tail
for (int i = 0; i < snakeTail.Count; i++)
{
if (i < snakeTail.Count - 1)
{
levelData[snakeTail[i].row, snakeTail[i].column] = "snake_body";
}
else
{
levelData[snakeTail[i].row, snakeTail[i].column] = "snake_tail";
}
}
}