private void MoveSnake()
{
// Removes the last part of the snake, in preparation of the new part added below
while (snakeParts.Count >= snakeLength)
{
GameArea.Children.Remove(snakeParts[0].UiElement);
snakeParts.RemoveAt(0);
}
// add a new element to the snake, which will be the (new) head
// then mark all existing parts as non-head (body) elements and then
// make sure that they use the body brush
foreach (SnakePart snakePart in snakeParts)
{
(snakePart.UiElement as Rectangle).Fill = snakeBodyBrush;
snakePart.IsHead = false;
}
// Determines in which direction to expand the snake, based on the current direction
SnakePart snakeHead = snakeParts[snakeParts.Count - 1];
double nextX = snakeHead.Position.X;
double nextY = snakeHead.Position.Y;
switch (snakeDirection)
{
case SnakeDirection.Left:
nextX -= SnakeSquareSize;
break;
case SnakeDirection.Right:
nextX += SnakeSquareSize;
break;
case SnakeDirection.Up:
nextY -= SnakeSquareSize;
break;
case SnakeDirection.Down:
nextY += SnakeSquareSize;
break;
}
// Adds the new head part to our list of snake parts
snakeParts.Add(new SnakePart()
{
Position = new Point(nextX, nextY),
IsHead = true
});
//snake is then drawn again
DrawSnake();
// Collision check method is then called
DoCollisionCheck();
}