/// <summary>
/// Move the snake one block on the game area
/// </summary>
private void MoveSnake()
{
// Remove 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);
}
// Let all existing snake parts be snake body parts
foreach (SnakePart snakePart in snakeParts)
{
(snakePart.UiElement as Rectangle).Fill = snakeBodyBrush;
snakePart.IsHead = false;
}
// Determine 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;
}
// Add new head to snake
snakeParts.Add(new SnakePart(new Point(nextX, nextY), true));
// Draw snake part
DrawSnake();
}
private void SetUpBody()
{
Body = new List <SnakePart>();
SnakePart temp;
for (int i = 0; i < Length; i++)
{
if (i == 0)
{
this.Body.Add(new SnakePart(Start, Start));
}
if (i > 0)
{
temp = new SnakePart(Body[i - 1].X, Body[i - 1].Y + 15);
Body.Add(temp);
}
}
}
public void AttachPart()
{
int start_x = Position_X - MovementDirection[0];
int start_y = Position_Y - MovementDirection[1];
SnakePart new_part = new SnakePart(start_x, start_y);
new_part.Width = 30;
new_part.Height = 30;
new_part.LastDirection = MovementDirection;
new_part.MovementDirection = MovementDirection;
new_part.PrevPart = null;
new_part.NextPart = this;
PrevPart = new_part;
}
private void MoveSnake()
{
while (SnakeParts.Count >= SnakeLength)
{
GameArea.Children.Remove(SnakeParts[0].UiElement);
SnakeParts.RemoveAt(0);
}
foreach (var SnakePart in SnakeParts)
{
(SnakePart.UiElement as Rectangle).Fill = SnakeBodyColor;
SnakePart.IsHead = false;
}
SnakePart SnakeHead = SnakeParts[SnakeParts.Count - 1];
double nextX = SnakeHead.Position.X;
double nextY = SnakeHead.Position.Y;
switch (snakeDirection)
{
case SnakeDirection.Left:
nextX -= CELL_WIDTH;
break;
case SnakeDirection.Right:
nextX += CELL_WIDTH;
break;
case SnakeDirection.Up:
nextY -= CELL_HEIGHT;
break;
case SnakeDirection.Down:
nextY += CELL_HEIGHT;
break;
}
SnakeParts.Add(new SnakePart()
{
Position = new Point(nextX, nextY),
IsHead = true
});
DrawSnake();
CheckCollisions();
}
private void HandleMovingSnakeOutsideMape(SnakePart SnakeHead)
{
if (SnakeHead.Position.X < 0)
{
SnakeHead.Position = new Point(GameArea.ActualWidth, SnakeHead.Position.Y);
}
else if (SnakeHead.Position.X + CELL_WIDTH > GameArea.Width)
{
SnakeHead.Position = new Point(0 - CELL_WIDTH, SnakeHead.Position.Y);
}
else if (SnakeHead.Position.Y < 0)
{
SnakeHead.Position = new Point(SnakeHead.Position.X, GameArea.ActualHeight);
}
else if (SnakeHead.Position.Y + CELL_HEIGHT > GameArea.Height)
{
SnakeHead.Position = new Point(SnakeHead.Position.X, 0 - CELL_HEIGHT);
}
}
public void UpdateMatrix(SnakePart part)
{
// get matrix size
int x = Game.Game_Matrix.GetLength(0);
int y = Game.Game_Matrix.GetLength(1);
// remove 1 from old position
if (part.Position_X - part.MovementDirection[0] >= 0 && part.Position_X - part.MovementDirection[0] < x &&
part.Position_Y - part.MovementDirection[1] >= 0 && part.Position_Y - part.MovementDirection[1] < y)
{
Game.Game_Matrix[part.Position_X - part.MovementDirection[0], part.Position_Y - part.MovementDirection[1]] = 0;
}
// update with new position
if (part.Position_X >= 0 && part.Position_X < x &&
part.Position_Y >= 0 && part.Position_Y < y)
{
Game.Game_Matrix[part.Position_X, part.Position_Y] = 1;
}
}
public void CheckNewPositionForCollisions(SnakePart head)
{
// Get matrix size
int x = Game.Game_Matrix.GetLength(0);
int y = Game.Game_Matrix.GetLength(1);
// If the position is inside the matrix
if (head.Position_X >= 0 && head.Position_X < x &&
head.Position_Y >= 0 && head.Position_Y < y)
{
// check if on that position is already some part
if (Game.Game_Matrix[head.Position_X, head.Position_Y] == 1)
{
// destroy the snake
Destroy();
}
// check if food is hit
if (Game.Game_Matrix[head.Position_X, head.Position_Y] == 2)
{
Game.IncreasePoints();
Game.Sounds["success"].controls.play();
Game.Game_Matrix[head.Position_X, head.Position_Y] = 0;
// attach one more part to the snake
SnakePart prev = null;
SnakePart current = Head;
while (current != null)
{
prev = current;
current = current.PrevPart;
}
prev.AttachPart();
// spawn another food
Game.SpawnFood();
}
}
}
// Construct new snake
// Main form is a must becase of game matrix size
// Second argument is the starting length of a snake
public Snake(Main main, Game game, int snake_width, int snake_height, int length = 6)
{
Game = game;
// set the global form to this main
form = main;
int max_x = Game.Game_Matrix.GetLength(0);
int max_y = Game.Game_Matrix.GetLength(1);
// Starting x and y coordinates of snake
int start_x = max_x / 2 + length;
int start_y = max_y / 2;
// define new part of snake
SnakePart new_part = null;
// Tells if head is created so just the first part is set as head
bool head_created = false;
// until length is zero
while (length != 0)
{
// Set the previous part so we can link it with next
// At the begining this will be null
SnakePart previous_part = new_part;
// Define new part on x,y coordinates
new_part = new SnakePart(start_x, start_y);
new_part.Width = snake_width;
new_part.Height = snake_height;
// Default direction will be to the right
new_part.LastDirection = new int[2] {
1, 0
};
new_part.MovementDirection = new int[2] {
1, 0
};
// If the head is not created, create it
if (!head_created)
{
// set that head is created so no part after this doesn't get set as head
head_created = true;
new_part.IsHead = true;
Head = new_part;
}
// next part of current part is previous
new_part.NextPart = previous_part;
// if there is a previous part (every part after Head has it)
if (previous_part != null)
{
// set it's previous part to this new part
previous_part.PrevPart = new_part;
}
// Write the position to the game matrx
Game.Game_Matrix[start_x, start_y] = 1;
// Decrease length
length--;
// Generate next part on the left side of the snake
start_x--;
}
}
