void start() {                //开始游戏按钮if (connected == 0) {MessageBox(NULL,"未连接到服务器，请在设置中输入IP","错误" , MB_OK);}else {form = 1;  //账号登录页面
    }
}   

class Button {
public:double x;double y;double w;double h;ClickEvent clickevent;            //按钮函数Button(double x1, double y1, double w1, double h1,ClickEvent ck) {x = x1;y = y1;w = w1;h = h1;clickevent = ck;}void draw() {            //绘制按钮glColor3f(0, 0, 0);glBegin(GL_QUADS);glVertex2f(x+w, y);glVertex2f(x, y);glVertex2f(x, y-h);glVertex2f(x+w, y-h);glEnd();}void click(double x1,double y1) {        //点击响应函数if (x1 >= x&&x1 <= x + w&&y1 >= y - h&&y1 <= y) {clickevent();}}
};

void connecttoserver() {stringstream ss(ip_inputbox.s);int a, b, c, d;char c1, c2, c3;ss >> a >> c1 >> b >> c2 >> c >> c3 >> d;if (c1 == '.'&&c2 == '.'&&c3 == '.'&&a <= 255 && a >= 0 && b <= 255 && b >= 0 && c <= 255 && c >= 0 && d <= 255 && d >= 0) {SERVIP = ip_inputbox.s.c_str();int status = client();if (status == 0) {MessageBox(NULL, "连接成功", "成功", MB_OK);            //*connected = 1;                //*
        }else if (status == 1) {MessageBox(NULL, "连接失败，请重试", "错误", MB_OK);}//form = 1;
    }else {ip_inputbox.s.clear();MessageBox(NULL, "IP地址格式输入错误，请重新输入", "错误", MB_OK);}
}

void musicon() {                //打开音乐按钮*PlaySound("res/abc.wav", NULL, SND_FILENAME | SND_ASYNC);
}

void musicoff() {                //关闭音乐按钮*
    PlaySound(NULL, NULL, NULL);
}

void fullscreen(){                //全屏按钮*
    glutFullScreen();
}

void window() {                //窗口化按钮*glutReshapeWindow(1366, 768);            //改变窗口大小int cx = glutGet(GLUT_SCREEN_WIDTH);    //获取屏幕大小int cy = glutGet(GLUT_SCREEN_HEIGHT);glutPositionWindow((cx - 1366) / 2, (cy - 768) / 2);    //窗口居中
}

void back() {                //返回按钮*form = 0;    //返回初始界面
}