//MyThread.cpp
void MyThread::run(){
    for (int i = 0; i < 60 ; i++) {
        int a = i;
        ui->label->setGeometry(0,a,20,20);
        sleep(0.001);
        cout << "\n";
    }
    for (int i = 0; i < 60 ; i++) {
        int a = i;
        ui->label->setGeometry(a,60,20,20);
        sleep(0.001);
    }
    for (int i = 0; i < 60 ; i++) {
        int a = 60-i;
        ui->label->setGeometry(60,a,20,20);
        sleep(0.001);
    }
    for (int i = 0; i < 60 ; i++) {
        int a = 60-i;
        ui->label->setGeometry(a,0,20,20);
        sleep(0.001);
    }
}


//MyThread.h
class MyThread : public QThread {
public:
    void run();
};

#endif  /* MYTHREAD_H */