基于easyx的贪吃蛇游戏C++

以下是基于easyx的贪吃蛇游戏C++的代码示例：

#include <graphics.h>
#include <conio.h>
#include <time.h>
#include <stdlib.h>

#define WIDTH 800
#define HEIGHT 600
#define SIZE 20

struct Snake {
    int x, y;
    struct Snake *next;
};

struct Food {
    int x, y;
};

int score = 0;
int high_score = 0;
int direction = VK_RIGHT;
struct Snake *head, *tail;
struct Food food;

void init();
void draw();
void update();
void generate_food();
bool check_collision(int x, int y);
void game_over();
void save_score();
void restart_game();

int main() {
    init();
    while (true) {
        draw();
        update();
        Sleep(100);
    }
    return 0;
}

void init() {
    initgraph(WIDTH, HEIGHT);
    setbkcolor(BLACK);
    setcolor(WHITE);
    settextstyle(20, 0, _T("Consolas"));
    head = new Snake{WIDTH / 2, HEIGHT / 2, NULL};
    tail = head;
    generate_food();
}

void draw() {
    cleardevice();
    // 画蛇
    struct Snake *p = head;
    while (p != NULL) {
        fillrectangle(p->x, p->y, p->x + SIZE, p->y + SIZE);
        p = p->next;
    }
    // 画食物
    setfillcolor(RED);
    fillcircle(food.x + SIZE / 2, food.y + SIZE / 2, SIZE / 2);
    // 画分数
    TCHAR str[20];
    _stprintf_s(str, _T("Score: %d"), score);
    outtextxy(10, 10, str);
    _stprintf_s(str, _T("High Score: %d"), high_score);
    outtextxy(10, 40, str);
}

void update() {
    // 移动蛇头
    int x = head->x, y = head->y;
    switch (direction) {
        case VK_LEFT:
            x -= SIZE;
            break;
        case VK_RIGHT:
            x += SIZE;
            break;
        case VK_UP:
            y -= SIZE;
            break;
        case VK_DOWN:
            y += SIZE;
            break;
    }
    // 检查是否吃到食物
    if (x == food.x && y == food.y) {
        score++;
        if (score > high_score) {
            high_score = score;
        }
        generate_food();
    } else {
        // 移动蛇尾
        tail->x = x;
        tail->y = y;
        head->next = tail;
        head = tail;
        tail = tail->next;
    }
    // 检查是否撞到墙或自己
    if (x < 0 || x >= WIDTH || y < 0 || y >= HEIGHT || check_collision(x, y)) {
        game_over();
    }
}

void generate_food() {
    srand((unsigned)time(NULL));
    do {
        food.x = rand() % (WIDTH / SIZE) * SIZE;
        food.y = rand() % (HEIGHT / SIZE) * SIZE;
    } while (check_collision(food.x, food.y));
}

bool check_collision(int x, int y) {
    struct Snake *p = tail;
    while (p != head) {
        if (p->x == x && p->y == y) {
            return true;
        }
        p = p->next;
    }
    return false;
}

void game_over() {
    save_score();
    TCHAR str[20];
    _stprintf_s(str, _T("Game Over! Score: %d"), score);
    MessageBox(NULL, str, _T("Game Over"), MB_OK);
    restart_game();
}

void save_score() {
    FILE *fp;
    fopen_s(&fp, "score.txt", "w");
    fprintf_s(fp, "%d", high_score);
    fclose(fp);
}

void restart_game() {
    score = 0;
    direction = VK_RIGHT;
    struct Snake *p = tail->next;
    while (p != NULL) {
        struct Snake *q = p;
        p = p->next;
        delete q;
    }
    head = new Snake{WIDTH / 2, HEIGHT / 2, NULL};
    tail = head;
    generate_food();
}

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