snake.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Timers;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private bool left;
        private bool right;
        private bool up;
        private bool down;

        private static int game_width = 300;
        private static int game_height = 300;
        private int snake_x;
        private int snake_y;
        private int apple_x;
        private int apple_y;

        public Bitmap bmp;
        public Graphics graph;

        private Brush black_color = Brushes.Black;
        private Brush snake_body_color = Brushes.Blue;
        private Brush apple_color = Brushes.Red;
        private float snake_x_size = 5;
        private float snake_y_size = 5;
        private float snake_default_size = 5;
        private float snake_max_size = 5;

        public Form1()
        {
            InitializeComponent();
            KeyUp += new KeyEventHandler(OnKeyUp);

            this.Width = Convert.ToInt32(game_width + 40);
            this.Height = Convert.ToInt32(game_height + 60);

            Bitmap bmp = new Bitmap(game_width, game_height);
            pictureBox1.Width = game_height;
            pictureBox1.Height = game_height;
            pictureBox1.Image = bmp;
            pictureBox1.Location = new Point(10, 10);
            pictureBox1.Size = new Size(game_width, game_height);
            Graphics graph = Graphics.FromImage(pictureBox1.Image);
            graph.FillRectangle(black_color, 0, 0, game_width, game_height);
            snake_x = (pictureBox1.Size.Width / 2);
            snake_y = (pictureBox1.Size.Height / 2);
            this.LocateApple();
            Draw_Snake(snake_x, snake_y);

            System.Windows.Forms.Timer time = new System.Windows.Forms.Timer();
            time.Tick += new EventHandler(run);
            time.Interval = 500;
            time.Start();
        }
        
        public void run(Object sender, object e)
        {
            if (left == true)
            {
                snake_x = snake_x - 5;
                snake_x_size = snake_max_size;
                snake_y_size = snake_default_size;
            }
            else if (right == true)
            {
                snake_x = snake_x + 5;
                snake_x_size = snake_max_size;
                snake_y_size = snake_default_size;
            }
            else if (up == true)
            {
                snake_y = snake_y - 5;
                snake_y_size = snake_max_size;
                snake_x_size = snake_default_size;
            }
            else if (down == true)
            {
                snake_y = snake_y + 5;
                snake_y_size = snake_max_size;
                snake_x_size = snake_default_size;
            }
            this.Draw_Snake(snake_x, snake_y);
        }

        public void LocateApple()
        {
            Graphics graph = Graphics.FromImage(pictureBox1.Image);
            SolidBrush brush = new SolidBrush(Color.Red);
            Pen pen = new Pen(brush);
            Random rand = new Random();
            apple_x = rand.Next(game_width/5)*5;
            apple_y = rand.Next(game_height/5)*5;
            graph.FillRectangle(apple_color, apple_x, apple_y, 5, 5);
            pictureBox1.Refresh();
            graph.Dispose();
        }

        public void Draw_Snake(int x, int y)
        {
            Graphics graph = Graphics.FromImage(pictureBox1.Image);
            SolidBrush brush = new SolidBrush(Color.Blue);
            Pen pen = new Pen(brush);
            graph.Clear(Color.Black);
            if (left == true)
            {
                graph.FillRectangle(snake_body_color, x, y, snake_x_size, snake_y_size);
            }
            else if (right == true)
            {
                graph.FillRectangle(snake_body_color, x, y, -snake_x_size, snake_y_size);
            }
            else if (up == true)
            {
                graph.FillRectangle(snake_body_color, x, y, snake_x_size, -snake_y_size);
            }
            else if (down == true)
            {
                graph.FillRectangle(snake_body_color, x, y, snake_x_size, snake_y_size);
            }
            graph.FillRectangle(snake_body_color, x, y, snake_x_size, snake_y_size);
            graph.FillRectangle(apple_color, apple_x, apple_y, 5, 5);
            pictureBox1.Refresh();
            graph.Dispose();
            if (snake_x == apple_x && snake_y == apple_y)
            {
                snake_max_size = snake_max_size + 5;
                if (left == true || right == true)
                {
                    snake_x_size = snake_max_size;
                    snake_y_size = snake_default_size;
                }
                else if (up == true || down == true)
                {
                    snake_y_size = snake_max_size;
                    snake_x_size = snake_default_size;
                }
                this.LocateApple();
                this.Draw_Snake(snake_x, snake_y);
            }
        }

        private void OnKeyUp(object sender, KeyEventArgs e)
        {
            int key = (int)e.KeyCode;
            if ((key == (int)Keys.Left) && (!right))
            {
                left = true;
                up = false;
                down = false;
            }
            if ((key == (int)Keys.Right) && (!left))
            {
                right = true;
                up = false;
                down = false;
            }
            if ((key == (int)Keys.Up) && (!down))
            {
                up = true;
                right = false;
                left = false;
            }
            if ((key == (int)Keys.Down) && (!up))
            {
                down = true;
                right = false;
                left = false;
            }
            if (((key == (int)Keys.Up) || (key == (int)Keys.Down)) && (left == true || right == true))
            {
                snake_y_size = snake_x_size;
                snake_x_size = snake_default_size;
            }
            if (((key == (int)Keys.Left) || (key == (int)Keys.Right)) && (up == true || down == true))
            {
                snake_x_size = snake_y_size;
                snake_y_size = snake_default_size;
            }
            Draw_Snake(snake_x, snake_y);
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }
    }
}