snake

#include "stdafx.h"
#include <iostream>
#include <list>
#include <Windows.h>
#include <algorithm>
#include <time.h>
using namespace std;


int grandseed = 0; // so you dont have to wait a second for new random
const int bwidth = 20;
const int bheight = 20;
int board[bwidth][bheight] = {}; // 0-null, 1-snake, 2-point
char symbols[] = ".@#";

void addPoint(){
    while (1){
        srand(time(0) + grandseed);
        grandseed++;
        int x = rand() % bwidth;
        int y = rand() % bheight;
        if (board[x][y] == 0){
            board[x][y] = 2;
            break;
            grandseed += 2;
        }

    }
}

struct Tile{
    int x, y, value;
    Tile(int _x, int _y, int _value){
        x = _x;
        y = _y;
        value = _value;
    }
    Tile(int _x, int _y){
        value = 0;
        x = _x;
        y = _y;
    }
};

struct Snake{
    int score = 0;
    bool lost = 0;
    short int direction = 0; // 0 left 1 up 2 right 3 down
    short int length = 1;
    list<Tile> tiles;
    Snake(int x, int y){
        tiles.push_front(Tile(x,y,1));
        board[x][y] = 1;
    }

    void Move(){
        int movetile;
        switch (direction){
        case 0:
            movetile = tiles.front().x - 1 == -1 ? bwidth - 1 : tiles.front().x - 1;
            if (board[movetile][tiles.front().y] == 1){
                lost = 1;
            }
            tiles.push_front(Tile(movetile, tiles.front().y, 1)); break;
            //xtiles.push_front(xtiles.front() - 1 == -1 ? bwidth - 1 : xtiles.front() - 1); break; OBSOLETE
        case 1:
            movetile = tiles.front().y - 1 == -1 ? bheight - 1 : tiles.front().y - 1;
            if (board[tiles.front().x][movetile] == 1){
                lost = 1;
            }
            tiles.push_front(Tile(tiles.front().x, movetile, 1)); break;
            //ytiles.push_front(ytiles.front() - 1 == -1 ? bheight - 1 : ytiles.front() - 1); break;
        case 2:
            movetile = tiles.front().x + 1 == bwidth ? 0 : tiles.front().x + 1;
            if (board[movetile][tiles.front().y] == 1){
                lost = 1;
            }
            tiles.push_front(Tile(movetile, tiles.front().y, 1)); break;
            //xtiles.push_front(xtiles.front() + 1 == bwidth ? 0 : xtiles.front() + 1); break;
        case 3:
            movetile = tiles.front().y + 1 == bheight ? 0 : tiles.front().y + 1;
            if (board[tiles.front().x][movetile] == 1){
                lost = 1;
            }
            tiles.push_front(Tile(tiles.front().x, movetile, 1)); break;
            //ytiles.push_front(ytiles.front() + 1 == bheight ? 0 : ytiles.front() + 1); break;
        }
        if (board[tiles.front().x][tiles.front().y] == 2){
            length += 1;
            addPoint();
            score++;
        }
        board[tiles.front().x][tiles.front().y] = 1;
        if (tiles.size() > length){
            board[tiles.back().x][tiles.back().y] = 0;
            tiles.pop_back();
        }
    }
};

void drawBoard(int score, int direction){
    system("cls");

    cout << "Score: " << score << "  Direction: ";
    switch (direction){
    case 0:
        cout << "left"; break;
    case 1:
        cout << "up"; break;
    case 2:
        cout << "right"; break;
    case 3:
        cout << "down"; break;
    }
    cout << endl;
    for (int i = 0; i < bheight; i++){
        for (int j = 0; j < bwidth; j++){
            cout << symbols[board[j][i]];
        }
        cout << endl;
    }
}
void GameLoop(){
    memset(board, 0, sizeof(board));
    Snake snake1(10, 10);
    drawBoard(snake1.score, snake1.direction);
    int loopi = 0;
    addPoint();
    while (1){
        if (GetAsyncKeyState(VK_UP)){
            snake1.direction = 1;
        }
        if (GetAsyncKeyState(VK_DOWN)){
            snake1.direction = 3;
        }
        if (GetAsyncKeyState(VK_LEFT)){
            snake1.direction = 0;
        }
        if (GetAsyncKeyState(VK_RIGHT)){
            snake1.direction = 2;
        }
        loopi++;
        if (loopi == 20){
            snake1.Move();
            if (snake1.lost){
                cout << "You lost. ";
                break;
            }
            drawBoard(snake1.score, snake1.direction);

            loopi = 0;
        }
        Sleep(15);
    }
}

int main()
{
    cout << "\n\t\t\t\t  SNAKE\n\nPress any key to continue.";
    getchar();
    while (1){
        GameLoop();
        cout << "Game over. Enter 0 to exit the game. Any other key to retry.";
        int a;
        cin >> a;
        if (a == 0) {
            break;
        }
    }

    return 0;
}