public void Update(object source, ElapsedEventArgs e)
{
if (GameState == State.RUNNING)
{
// Check collison between snake and apple
CordinatePair snakeHead = Snake.Head;
if (snakeHead.X == Apple.X && snakeHead.Y == Apple.Y)
{
Score += 1;
InitApple();
Snake.GrowBigger();
}
Snake.Update();
// Check collision between head and tail
List <CordinatePair> tail = Snake.Tail;
foreach (CordinatePair snakeBit in tail)
{
if (snakeHead.X == snakeBit.X && snakeHead.Y == snakeBit.Y)
{
GameOver();
}
}
// Check collision between snake and walls
if (map.GetTileAt(Snake.Head.X, Snake.Head.Y) == 1)
{
GameOver();
}
}
Render();
}
public Snake(int x, int y)
{
direction = Direction.RIGHT;
Tail = new List <CordinatePair>();
Head = new CordinatePair {
X = x, Y = y
};
}
public SnakeGame(PictureBox pictureBox)
{
map = new Map();
Apple = new CordinatePair();
gameRenderer = new GameRenderer(pictureBox, this);
InitNewSnake();
InitApple();
GameState = State.NOT_STARTED;
timer = new System.Timers.Timer(120);
timer.Elapsed += new ElapsedEventHandler(Update);
timer.Start();
}
public void GrowBigger()
{
CordinatePair lastSnakeBit = numberOfTailElements != 0 ? Tail.Last() : Head;
CordinatePair snakeBit = new CordinatePair
{
X = lastSnakeBit.X, Y = lastSnakeBit.Y
};
Tail.Add(snakeBit);
numberOfTailElements += 1;
}
private void Move(int x, int y)
{
for (var i = numberOfTailElements - 1; i > -1; i -= 1)
{
CordinatePair tailElement = Tail[i];
CordinatePair leadingTail = i == 0 ? Head : Tail[i - 1];
tailElement.X = leadingTail.X;
tailElement.Y = leadingTail.Y;
// tailElement.Movable = true;
}
Head.X += x;
Head.Y += y;
}
public void Render()
{
Font font = new Font("Arial", 14);
// Clear screen
backBufferGfx.DrawImage(wallsBitmap, 0, 0);
// Render the snake
if (snakeGame.GameState == SnakeGame.State.RUNNING)
{
Snake snake = snakeGame.Snake;
CordinatePair head = snake.Head;
backBufferGfx.FillRectangle(Brushes.Yellow, head.X * tileWidth,
head.Y * tileHeight, tileWidth, tileHeight);
var snakeBits = snake.Tail;
foreach (CordinatePair snakeBit in snakeBits)
{
backBufferGfx.FillRectangle(Brushes.Yellow, snakeBit.X * tileWidth,
snakeBit.Y * tileHeight, tileWidth, tileHeight);
}
// Render the apple
CordinatePair apple = snakeGame.Apple;
backBufferGfx.FillEllipse(Brushes.Green, apple.X * tileWidth,
apple.Y * tileHeight, tileWidth, tileHeight);
}
// Draw score
backBufferGfx.DrawString("SCORE: " + snakeGame.Score, font, Brushes.Black, 2, 2);
// Draw Game-over string, if we are game over
if (snakeGame.GameState == SnakeGame.State.GAMEOVER)
{
backBufferGfx.DrawString("GAME OVER", font, Brushes.Red, 240, 200);
backBufferGfx.DrawString("PRESS SPACE TO RESTART", font, Brushes.Red, 170, 260);
}
else if (snakeGame.GameState == SnakeGame.State.NOT_STARTED)
{
backBufferGfx.DrawString("PRESS SPACE TO START", font, Brushes.Green, 180, 225);
}
// Render to screen
view.Image = backBufferBitmap;
}