void Line::move(int direction)
    {
        redraw(BG_COLOR);

        int y2 = floor(y-r*(cos(angle)));
        int x2 = floor(x+r*(sin(angle)));

        if(direction == DIRECTION_UP)
        {

            if(y2 <= y)
            {
                if(y2-MOVE_LENGTH <= 0) y -= y2;
                    else y -= MOVE_LENGTH;
            }
            else
            {
                if(y-MOVE_LENGTH <= 0) y = 0;
                    else y -= MOVE_LENGTH;
            }

        }
        if(direction == DIRECTION_DOWN)
        {
            if(y2 >= y)
            {
                if(y2+MOVE_LENGTH >= GrMaxY()) y += GrMaxY()-y2;
                    else y += MOVE_LENGTH;
            }
            else
            {
                if(y+MOVE_LENGTH >= GrMaxY()) y += GrMaxY()-y;
                    else y += MOVE_LENGTH;
            }
        }
        if(direction == DIRECTION_RIGHT)
        {

            if(x2 >= x)
            {
                if(x2+MOVE_LENGTH >= GrMaxX()) x += GrMaxX()-x2;
                    else x += MOVE_LENGTH;
            }
            else
            {
                if(x+MOVE_LENGTH >= GrMaxX()) x += GrMaxX()-x;
                    else x += MOVE_LENGTH;
            }
        }
        if(direction == DIRECTION_LEFT)
        {
            if(x2 <= x)
            {
                if(x2-MOVE_LENGTH <= 0) x -= x2;
                    else x -= MOVE_LENGTH;
            }
            else
            {
                if(x-MOVE_LENGTH <= 0) x = 0;
                    else x -= MOVE_LENGTH;
            }
        }
        redraw(color);
    }