public static CollisionType Check(ISnakeObject snake, IFood food)
{
ISnakePart snakeHead = snake.SnakeParts[0];
//Checking heads coords against food coords
if ((snakeHead.Position.X == food.Position.X) && (snakeHead.Position.Y == food.Position.Y))
{
return(CollisionType.Food);
}
//Checking heads coords against game area boundaries
if ((snakeHead.Position.Y < 0) || (snakeHead.Position.Y >= Constants.GAMEAREAHEIGHT) ||
(snakeHead.Position.X < 0) || (snakeHead.Position.X >= Constants.GAMEAREAWIDTH))
{
return(CollisionType.Obstacle);
}
//Checking heads coords against all snake parts coords (excluding head)
foreach (ISnakePart snakeBodyPart in snake.SnakeParts.GetRange(1, snake.SnakeParts.Count - 1))
{
if ((snakeHead.Position.X == snakeBodyPart.Position.X) && (snakeHead.Position.Y == snakeBodyPart.Position.Y))
{
return(CollisionType.Obstacle);
}
}
//If none of above is true there is no collision
return(CollisionType.None);
}
public void Grow()
{
double newTailX = SnakeParts[SnakeParts.Count - 1].Position.X;
double newTailY = SnakeParts[SnakeParts.Count - 1].Position.Y;
switch (SnakeDirection)
{
case SnakeDirection.Left:
newTailX -= Constants.SNAKESQUARESIZE;
break;
case SnakeDirection.Right:
newTailX += Constants.SNAKESQUARESIZE;
break;
case SnakeDirection.Up:
newTailY -= Constants.SNAKESQUARESIZE;
break;
case SnakeDirection.Down:
newTailY += Constants.SNAKESQUARESIZE;
break;
}
//Adding new tail to the snake to simulate its growth
ISnakePart newTail = Factory.CreateSnakePart();
newTail.Position = new Point(newTailX, newTailY);
SnakeParts.Add(newTail);
}
