Движение машинки

void Car::moving()
{

    // движение при подъезде к перекрёстку, если светофор не зелёный, то стоп

    if (tc !=3 && f==false)
    {

        if (direction==1 && y>=10)
        {
            emit siganlXY(direction, x, y);
            return;
        }
        if (direction==2 && x<=320)
        {
            int nx = x + CLENGTH;
            emit siganlXY(direction, nx, y);
            return;
        }

        if (direction==3 && y<=320)
        {
            int ny = y + CLENGTH;
            emit siganlXY(direction, x, ny);
            return;
        }


        if (direction==4 && x>=10)
        {
            emit siganlXY(direction, x, y);
            return;
        }


    }

    if (tc == 3 && f==false)
    {

        if (direction==1 && y>=20)
        {
            turn();
            return;
        }
        if (direction==2 && x<=310)
        {
            turn();
            return;
        }

        if (direction==3 && y<=310)
        {
            turn();
            return;
        }

        if (direction==4 && x>=20)
        {
            turn();
            return;
        }


    }

    // если машинка после повторота исчезла за краем экрана, то
    if (f==true)
    {

        if (direction==1 && y>=450)
        {
            x = 150;
            y = -138;
            srand (time(NULL));
            Turn = rand()%3;
            f = false;
            return;
        }
        if (direction==2 && x<=0)
        {
            x = 460;
            y = 150;
            srand (time(NULL));
            Turn = rand()%3;
            f = false;
            return;
        }

        if (direction==3 && y<=0)
        {
            x = 250;
            y = 460;
            srand (time(NULL));
            Turn = rand()%3;
            f = false;
            return;
        }


        if (direction==4 && x>=450)
        {
            x = -138;
            y = 250;
            srand (time(NULL));
            Turn = rand()%3;
            f = false;
            return;
        }

    }

    // движение в зависимости от направления

    if (direction==1)
    {
        y++;
        emit siganlXY(direction, x, y);
        return;
    }
    if (direction==2)
    {
        x--;
        int nx = x + CLENGTH;
        emit siganlXY(direction, nx, y);
        return;
    }

    if (direction==3)
    {
        y--;
        int ny = y + CLENGTH;
        emit siganlXY(direction, x, ny);
        return;
    }


    if (direction==4)
    {
        x++;
        emit siganlXY(direction, x, y);
        return;
    }



}


//==================================================
void Car::turn()
{
    if (Turn == 0)
    {
        f = true;
        return;
    }

    if ((direction == 1 && Turn == 1) || (direction == 3 && Turn == 2))
    {
        direction = 4;
        x++;
        y = 250;
    }

    if ((direction == 1 && Turn == 2) || (direction == 3 && Turn == 1))
    {
        direction = 2;
        x--;
        y = 150;
    }

    if ((direction == 2 && Turn == 1) || (direction == 4 && Turn == 2))
    {
        direction = 1;
        y++;
        x = 150;
    }

    if ((direction == 2 && Turn == 2) || (direction == 4 && Turn == 1))
    {
        direction = 3;
        y--;
        x = 250;
    }

    f = true;

}

//==================================================
//==================================================