CmdLineGame2.cs

using System;
namespace CmdLineGame2 {
    class MainClass {
        public static void Main (string[] args) {
            MainClass mc = new MainClass ();
            mc.DoGame ();
        }
        class Entity {
            public MainClass game;
            public int x = 2, y = 3;
            public char face = '@';
            public Entity(MainClass g, int x, int y, char c) {
                this.game = g; this.x = x; this.y = y; this.face = c;
            }
            public void Draw() { Console.Write (face); }
            public bool IsAt(int x, int y) { return this.x == x && this.y == y; }
            public virtual void Update() {}
        }
        class Player : Entity {
            public Player(MainClass g, int x, int y, char c):base(g,x,y,c){}
            public override void Update() {
                if (game.input == 'w') { y --; }
                if (game.input == 's') { y ++; }
                if (game.input == 'a') { x = x - 1; }
                if (game.input == 'd') { x += 1; }
            }
        }
        class RandomEnemy : Entity {
            public RandomEnemy(MainClass g, int x, int y, char c)
                :base(g,x,y,c) { }
            public override void Update() {
                Random r = new Random ();
                string possibleMoves = "wasd ";
                int randomNumber = r.Next ();
                int cappedBetween0And5 = randomNumber % 5;
                char whichMove = possibleMoves[ cappedBetween0And5 ];
                if (whichMove == 'w') { y --; }
                if (whichMove == 's') { y ++; }
                if (whichMove == 'a') { x = x - 1; }
                if (whichMove == 'd') { x += 1; }
            }
        }
        Entity[] players;
        public MainClass() {
            players = new Entity[]{
                new Player(this, 2, 3, '@'), // 0 player
                new RandomEnemy(this, 4, 4, 'o')  // 1
            };
        }
        int width = 10, height = 8, input;
        bool gameRunning = true;
        int GetPlayerAt(int col, int row) {
            for (int p = 0; p < players.Length; p++) {
                if (players [p].IsAt(col, row)) {
                    return p;
                }
            }
            return -1;
        }
        void Draw() {
            Console.SetCursorPosition (0, 0);
            for (int row = 0; row < height; row++) {
                for (int col = 0; col < width; col++) {
                    int playerHere = GetPlayerAt(col, row);
                    if (playerHere == -1) {
                        Console.Write ('.');
                    } else {
                        players [playerHere].Draw ();
                    }
                }
                Console.Write ('\n');
            }
        }
        void Input() {
            if (Console.KeyAvailable) {
                do {
                    input = Console.Read ();
                } while(input == '\r' || input == '\n'); // FIXME handle '\n' and '\r' line endings without a loop
            } else {
                DateTime start = DateTime.Now;
                // throttle code - pausing to keep framerate more consistent
                while ((DateTime.Now - start).TotalMilliseconds < 100 && !Console.KeyAvailable) {
                    System.Threading.Thread.Sleep (1);
                }
                input = -1;
            }
        }
        void Update() {
            for (int i = 0; i < players.Length; i++) {
                players [i].Update ();
            }
            if (input == 27) { gameRunning = false; }
            if(players[0].x < 0) { Console.WriteLine("YOU LOSE!"); gameRunning = false; }
            if(players[0].x >= width) { Console.WriteLine("YOU WIN!!"); gameRunning = false; }
            if (players[0].x == players[1].x && players[0].y == players[1].y) { // if the player reaches the coin
                Console.Write ("\a");                       // play a sound
            }
        }
        public void DoGame() {
            while (gameRunning) {
                Draw ();   // draws, or "renders" the game
                Input ();  // do nothing but get input from user as quickly as possible
                Update (); // handle all changes to state, esp. based on user input and AI
            }
        }
    }
}