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);
}
private void StartButton_Click(object sender, RoutedEventArgs e)
{
//UI preparation
StartButton.IsEnabled = false;
Score.Text = "Score: 0";
SnakeImage.Source = null;
if (food != null && snake != null)
{
GameArea.Children.Remove(food.UiElement);
RemoveSnakeFromScreen();
}
//Setting back to defaults
snake = Factory.CreateSnake();
food = Factory.CreateFood(snake);
GameParameters.Score = 0;
//Laying out new snake and food
DrawSnake();
DrawFood();
//Setting sped back to initial and starting the game
gameTimer.Interval = TimeSpan.FromMilliseconds(Constants.INITIALSNAKESPEED);
gameTimer.IsEnabled = true;
}
public Food(ISnakeObject snake)
{
Position = Randomizer.GetFoodPosition(snake);
UiElement = new Ellipse()
{
Width = Constants.TILESIZE,
Height = Constants.TILESIZE,
Fill = Constants.FOODBRUSH
};
}
public static Point GetFoodPosition(ISnakeObject snake)
{
//Getting maximum coordinates within game area and normalizing them against tile size
int maxX = (int)(Constants.GAMEAREAWIDTH / Constants.TILESIZE);
int maxY = (int)(Constants.GAMEAREAHEIGHT / Constants.TILESIZE);
//Getting random tile coordinates for food positioning
int foodX = random.Next(0, maxX) * Constants.TILESIZE;
int foodY = random.Next(0, maxY) * Constants.TILESIZE;
//Checking whether obtained food coordinates do not collide with all the snake parts coordinates, if so generating new coordinates
foreach (ISnakePart snakePart in snake.SnakeParts)
{
if ((snakePart.Position.X == foodX) && (snakePart.Position.Y == foodY))
{
return(GetFoodPosition(snake));
}
}
return(new Point(foodX, foodY));
}
public static IFood CreateFood(ISnakeObject snake)
{
return(new Food(snake));
}
