/// <summary>
/// Event that defines what happens on each game tick.
/// </summary>
public void tick(Object sender, EventArgs e)
{
prevdirectionX = directionX;
prevdirectionY = directionY;
int snakeX = snake.getX();
int snakeY = snake.getY();
// Check snake collision with borders, food, or itself
if (snakeX > board.ActualWidth || snakeX < 0 || snakeY < 0 || snakeY > board.ActualHeight)
{
// Game over
timer.Stop();
}
if (snakeX == food.getX() && snakeY == food.getY())
{
snake.addBody();
food.newLocation();
}
int snakeSize = snake.body.Count;
for (int i = 0; i < snakeSize; i++)
{
int bodyX = snake.body[i].Item1;
int bodyY = snake.body[i].Item2;
if (snakeX == bodyX && snakeY == bodyY)
{
// Game over
timer.Stop();
}
}
// Update the snake body starting with the tail
for (int i = snakeSize - 1; i > 0; i--)
{
int forwardX = snake.body[i - 1].Item1;
int forwardY = snake.body[i - 1].Item2;
snake.body[i] = new Tuple <int, int>(forwardX, forwardY);
}
snake.body[0] = new Tuple <int, int>(snakeX, snakeY);
// Update the snake head
int newX = snakeX + directionX;
int newY = snakeY + directionY;
snake.setX(newX);
snake.setY(newY);
render();
}