用C++编写一个有用户登录界面的飞机大战小游戏

下面是一个简单的飞机大战小游戏的示例代码，包含用户登录界面和基本游戏功能。

#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>
#include <windows.h>
using namespace std;

// 定义游戏区域大小
const int WIDTH = 60;
const int HEIGHT = 20;

// 定义玩家飞机的属性
const int PLAYER_X = WIDTH / 2;
const int PLAYER_Y = HEIGHT - 3;
const int PLAYER_LIVES = 3;

// 定义敌机的属性
const int ENEMY_COUNT = 10;
const int ENEMY_MIN_SPEED = 1;
const int ENEMY_MAX_SPEED = 3;

// 定义子弹的属性
const int BULLET_SPEED = 2;
const int BULLET_MAX_COUNT = 5;

// 定义用户信息
const string USERNAME = "admin";
const string PASSWORD = "123456";

// 定义游戏状态枚举
enum GameState {
    MENU,
    LOGIN,
    PLAYING,
    GAMEOVER,
    QUIT
};

// 定义游戏对象结构体
struct GameObject {
    int x;
    int y;
    char symbol;
    int speed;
};

// 定义玩家飞机结构体
struct Player {
    int x;
    int y;
    int lives;
    int score;
};

// 定义敌机结构体
struct Enemy {
    int x;
    int y;
    bool active;
    int speed;
};

// 定义子弹结构体
struct Bullet {
    int x;
    int y;
    bool active;
};

// 初始化游戏对象，包括玩家飞机、敌机和子弹
void initObjects(Player& player, Enemy enemies[], Bullet bullets[]) {
    // 初始化玩家飞机
    player.x = PLAYER_X;
    player.y = PLAYER_Y;
    player.lives = PLAYER_LIVES;
    player.score = 0;

    // 初始化敌机
    for (int i = 0; i < ENEMY_COUNT; i++) {
        enemies[i].x = rand() % (WIDTH - 2) + 1;
        enemies[i].y = rand() % 5 + 1;
        enemies[i].active = true;
        enemies[i].speed = rand() % (ENEMY_MAX_SPEED - ENEMY_MIN_SPEED + 1) + ENEMY_MIN_SPEED;
    }

    // 初始化子弹
    for (int i = 0; i < BULLET_MAX_COUNT; i++) {
        bullets[i].x = player.x;
        bullets[i].y = player.y - 1;
        bullets[i].active = false;
    }
}

// 绘制游戏界面
void drawScreen(Player& player, Enemy enemies[], Bullet bullets[], int& bulletCount, int& enemyCount, bool& gameOver) {
    system("cls");
    // 绘制上边框
    for (int i = 0; i < WIDTH; i++) {
        cout << "-";
    }
    cout << endl;

    // 绘制游戏区域
    for (int i = 0; i < HEIGHT - 2; i++) {
        cout << "|";
        for (int j = 0; j < WIDTH - 2; j++) {
            if (i == player.y && j == player.x) {
                cout << "A";
            }
            else {
                bool isEnemy = false;
                for (int k = 0; k < enemyCount; k++) {
                    if (i == enemies[k].y && j == enemies[k].x && enemies[k].active) {
                        cout << "V";
                        isEnemy = true;
                        break;
                    }
                }
                if (!isEnemy) {
                    bool isBullet = false;
                    for (int k = 0; k < bulletCount; k++) {
                        if (i == bullets[k].y && j == bullets[k].x && bullets[k].active) {
                            cout << "*";
                            isBullet = true;
                            break;
                        }
                    }
                    if (!isBullet) {
                        cout << " ";
                    }
                }
            }
        }
        cout << "|" << endl;
    }

    // 绘制下边框
    for (int i = 0; i < WIDTH; i++) {
        cout << "-";
    }
    cout << endl;

    // 显示玩家信息
    cout << "Lives: " << player.lives << " Score: " << player.score << endl;

    // 判断游戏是否结束
    if (gameOver) {
        cout << "Game Over!" << endl;
    }
}

// 处理用户输入
void processInput(Player& player, Bullet bullets[], int& bulletCount, bool& gameOver) {
    if (GetAsyncKeyState(VK_LEFT) && player.x > 1) {
        player.x--;
    }
    if (GetAsyncKeyState(VK_RIGHT) && player.x < WIDTH - 2) {
        player.x++;
    }
    if (GetAsyncKeyState(VK_SPACE)) {
        for (int i = 0; i < BULLET_MAX_COUNT; i++) {
            if (!bullets[i].active) {
                bullets[i].x = player.x;
                bullets[i].y = player.y - 1;
                bullets[i].active = true;
                bulletCount++;
                break;
            }
        }
    }
    if (player.lives == 0) {
        gameOver = true;
    }
}

// 更新游戏状态
void updateGameState(Player& player, Enemy enemies[], Bullet bullets[], int& bulletCount, int& enemyCount, bool& gameOver) {
    // 更新子弹位置
    for (int i = 0; i < BULLET_MAX_COUNT; i++) {
        if (bullets[i].active) {
            bullets[i].y -= BULLET_SPEED;
            if (bullets[i].y < 1) {
                bullets[i].active = false;
                bulletCount--;
            }
        }
    }

    // 更新敌机位置
    for (int i = 0; i < enemyCount; i++) {
        if (enemies[i].active) {
            enemies[i].y += enemies[i].speed;
            if (enemies[i].y >= HEIGHT - 2) {
                enemies[i].x = rand() % (WIDTH - 2) + 1;
                enemies[i].y = rand() % 5 + 1;
            }
        }
    }

    // 检测子弹和敌机的碰撞
    for (int i = 0; i < BULLET_MAX_COUNT; i++) {
        if (bullets[i].active) {
            for (int j = 0; j < enemyCount; j++) {
                if (enemies[j].active && bullets[i].x == enemies[j].x && bullets[i].y == enemies[j].y) {
                    bullets[i].active = false;
                    bulletCount--;
                    enemies[j].active = false;
                    enemyCount--;
                    player.score++;
                    break;
                }
            }
        }
    }

    // 检测玩家和敌机的碰撞
    for (int i = 0; i < enemyCount; i++) {
        if (enemies[i].active && player.x == enemies[i].x && player.y == enemies[i].y) {
            player.lives--;
            enemies[i].active = false;
            enemyCount--;
            break;
        }
    }
}

// 用户登录界面
bool login() {
    string username, password;
    cout << "Username: ";
    cin >> username;
    cout << "Password: ";
    cin >> password;
    return username == USERNAME && password == PASSWORD;
}

int main() {
    // 初始化随机数种子
    srand(time(NULL));

    // 定义游戏状态
    GameState state = MENU;

    // 定义游戏对象
    Player player;
    Enemy enemies[ENEMY_COUNT];
    Bullet bullets[BULLET_MAX_COUNT];
    int bulletCount = 0;
    int enemyCount = ENEMY_COUNT;
    bool gameOver = false;

    while (state != QUIT) {
        switch (state) {
            case MENU:
                cout << "1. Login" << endl;
                cout << "2. Quit" << endl;
                int choice;
                cin >> choice;
                if (choice == 1) {
                    state = LOGIN;
                }
                else if (choice == 2) {
                    state = QUIT;
                }
                break;
            case LOGIN:
                if (login()) {
                    initObjects(player, enemies, bullets);
                    state = PLAYING;
                }
                else {
                    cout << "Invalid username or password!" << endl;
                    state = MENU;
                }
                break;
            case PLAYING:
                drawScreen(player, enemies, bullets, bulletCount, enemyCount, gameOver);
                processInput(player, bullets, bulletCount, gameOver);
                updateGameState(player, enemies, bullets, bulletCount, enemyCount, gameOver);
                if (gameOver) {
                    state = GAMEOVER;
                }
                break;
            case GAMEOVER:
                cout << "Press any key to continue..." << endl;
                cin.get();
                cin.get();
                state = MENU;
                break;
        }
    }

    return 0;
}

注意：本示例代码仅供参考，可能存在不足之处，需要根据实际情况进行修改和完善。