As Snake Clear Intensity 5 0 Without Using Any Continues
I can't realize the possibility of continuing the game after a collision. The snake should stop and start moving after clicking on one of the arrow buttons.
In a collision, a window appears about the loss, I need to continue the game.
I press the button and the following happens:
I don't understand how I can save the coordinates of the snake just before the collision. In the moveTimer_Tick method, all elements move, i.e. new coordinates have already appeared at the head and body, then there is a check for collisions with the wall and body. If they are found, a window appears about the loss. New snake coordinates are not displayed. But after clicking the "Continue" button, an update occurs and the snake climbs to the border.
The question is: how can I save the coordinates of the snake, before the collision, and after continuing to start with them.
namespace Snake{ public partial class MainWindow : Window { //The field on which the snake lives Entity field; // snake head Head head; // whole snake List<PositionedEntity> snake; // apple Apple apple; //number of points int score; // Is movement paused bool paused; //time DispatcherTimer moveTimer; //constructor form public MainWindow() { InitializeComponent(); snake = new List<PositionedEntity>(); //create field 600x600pixels field = new Entity(600, 600, "pack://application:,,,/Resources/snake.png"); //create a timer that runs every 300 ms moveTimer = new DispatcherTimer(); moveTimer.Interval = new TimeSpan(0, 0, 0, 0, 300); moveTimer.Tick += new EventHandler(moveTimer_Tick); } //redraw screen method private void UpdateField() { //update the position of the elements of the snake foreach (var p in snake) { Canvas.SetTop(p.image, p.y); Canvas.SetLeft(p.image, p.x); } //update the position of apple Canvas.SetTop(apple.image, apple.y); Canvas.SetLeft(apple.image, apple.x); //points update lblScore.Content = String.Format("{0}000", score); } //timer tick handler. All movement takes place here. void moveTimer_Tick(object sender, EventArgs e) { // Do not update if movement is paused if(paused) { return; } //in the reverse order we move all the elements of the snake foreach (var p in Enumerable.Reverse(snake)) { p.move(); } //we check that the head of the snake did not crash into the body foreach (var p in snake.Where(x => x != head)) { if (p.x == head.x && p.y == head.y) { //we lose moveTimer.Stop(); GameOver.Visibility = Visibility.Visible; btnRestart.Visibility = Visibility.Visible; tbScore.Text = String.Format("SCORE: {0}000", score); return; } } //check that the head of the snake did not go out of the field if (head.x < 40 || head.x >= 540 || head.y < 40 || head.y >= 540) { //we lose moveTimer.Stop(); GameOver.Visibility = Visibility.Visible; btnRestart.Visibility = Visibility.Visible; tbScore.Text = String.Format("SCORE: {0}000", score); return; } //check that the head of the snake crashed into an apple if (head.x == apple.x && head.y == apple.y) { //increase the score score++; //move the apple to a new place apple.move(); var part = new BodyPart(snake.Last()); canvas1.Children.Add(part.image); snake.Add(part); } UpdateField(); } private void Window_KeyDown(object sender, KeyEventArgs e) { // Unpause movement when any key is pressed if(paused) { paused = false; } switch (e.Key) { case Key.Up: head.direction = Head.Direction.UP; break; case Key.Down: head.direction = Head.Direction.DOWN; break; case Key.Left: head.direction = Head.Direction.LEFT; break; case Key.Right: head.direction = Head.Direction.RIGHT; break; } } // "Start" private void button1_Click(object sender, RoutedEventArgs e) { btnStart.Visibility = Visibility.Hidden; btnRestart.Visibility = Visibility.Hidden; tBNotEnoughPoints.Visibility = Visibility.Hidden; score = 0; snake.Clear(); canvas1.Children.Clear(); // "Game Over" GameOver.Visibility = Visibility.Hidden; canvas1.Children.Add(field.image); apple = new Apple(snake); canvas1.Children.Add(apple.image); head = new Head(); snake.Add(head); canvas1.Children.Add(head.image); moveTimer.Start(); UpdateField(); } private void btnContinue_Click(object sender, RoutedEventArgs e) { if (score >= 2) { GameOver.Visibility = Visibility.Hidden; btnRestart.Visibility = Visibility.Hidden; score -= 2; // Pause movement paused = true; moveTimer.Start(); UpdateField(); } else { tBNotEnoughPoints.Visibility = Visibility.Visible; } } public class Entity { protected int m_width; protected int m_height; Image m_image; public Entity(int w, int h, string image) { m_width = w; m_height = h; m_image = new Image(); m_image.Source = (new ImageSourceConverter()).ConvertFromString(image) as ImageSource; m_image.Width = w; m_image.Height = h; } public Image image { get { return m_image; } } } public class PositionedEntity : Entity { protected int m_x; protected int m_y; public PositionedEntity(int x, int y, int w, int h, string image) : base(w, h, image) { m_x = x; m_y = y; } public virtual void move() { } public int x { get { return m_x; } set { m_x = value; } } public int y { get { return m_y; } set { m_y = value; } } } public class Apple : PositionedEntity { List<PositionedEntity> m_snake; public Apple(List<PositionedEntity> s) : base(0, 0, 40, 40, "pack://application:,,,/Resources/fruit.png") { m_snake = s; move(); } public override void move() { Random rand = new Random(); do { x = rand.Next(13) * 40 + 40 ; y = rand.Next(13) * 40 + 40 ; bool overlap = false; foreach (var p in m_snake) { if (p.x == x && p.y == y) { overlap = true; break; } } if (!overlap) break; } while (true); } } public class Head : PositionedEntity { public enum Direction { RIGHT, DOWN, LEFT, UP, NONE }; Direction m_direction; public Direction direction { set { m_direction = value; RotateTransform rotateTransform = new RotateTransform(90 * (int)value); image.RenderTransform = rotateTransform; } } public Head() : base(280, 280, 40, 40, "pack://application:,,,/Resources/head.png") { image.RenderTransformOrigin = new Point(0.5, 0.5); m_direction = Direction.NONE; } public override void move() { switch (m_direction) { case Direction.DOWN: y += 40; break; case Direction.UP: y -= 40; break; case Direction.LEFT: x -= 40; break; case Direction.RIGHT: x += 40; break; } } } public class BodyPart : PositionedEntity { PositionedEntity m_next; public BodyPart(PositionedEntity next) : base(next.x, next.y, 40, 40, "pack://application:,,,/Resources/body.png") { m_next = next; } public override void move() { x = m_next.x; y = m_next.y; } } } } Source: https://stackoverflow.com/questions/59457080/snake-roll-back-the-coordinates-of-the-snake-to-impact
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