/// <summary>
/// Event which is used to determine the direction to move the <see cref="Snake"/>.
/// </summary>
/// <param name="sender">An <see cref="object"/> representing the source of the event.</param>
/// <param name="e">An <see cref="EventArgs"/> containing the event data.</param>
private void SnakeGame_KeyDown(object sender, KeyEventArgs e)
{
if (this.canRestart && e.KeyData == Keys.Space)
{
this.canRestart = false;
this.NewGame();
}
else
{
this.direction = SnakeUtility.ChangeDirection(this.direction, this.previousDirection, e.KeyData);
}
}
/// <summary>
/// Creates/Recreates the game and then starts it.
/// </summary>
private void NewGame()
{
this.Controls.Clear();
this.gridSize = new Size(this.ClientSize.Width / BaseBlock.StandardBlockSize.Width, this.ClientSize.Height / BaseBlock.StandardBlockSize.Height);
this.snake = new Snake(SnakeGame.DefaultSnakeLength);
this.emptyPositions = SnakeUtility.GetEmptyBlockPositions(this.snake, this.gridSize);
this.food = new FoodBlock(this.emptyPositions);
this.direction = new Point(0, 1);
this.state = GameState.Playing;
this.Invalidate();
this.gameTimer.Enabled = true;
}
/// <summary>
/// Performs the main loop of game which is ran on every tick of the game timer.
/// </summary>
private void GameLoop()
{
if (this.direction.X == 0 && this.direction.Y == 0)
{
return;
}
if (SnakeUtility.WillEatFood(this.snake, this.food, this.direction))
{
this.snake.Grow();
this.emptyPositions = SnakeUtility.GetEmptyBlockPositions(this.snake, this.gridSize);
this.food = new FoodBlock(this.emptyPositions);
}
this.snake.Move(this.direction);
this.previousDirection = this.direction;
if (SnakeUtility.HasCollidedWithSelf(this.snake) || SnakeUtility.HasHitBounds(this.snake, this.gridSize.Width, this.gridSize.Height) || this.emptyPositions.Count == 0)
{
this.GameOver();
}
}
