let dist = getDiaDist(...getAbsDist([clientX, clientY], [_x, _y]));

if (dist < range) {
      unit.x = clientX;
      unit.y = clientY;
  } else {
      let xx = clientX;
      let yy = clientY;
      let cc = range / dist;

      unit.x = _x + (xx - _x) * cc;
      unit.y = _y + (yy - _y) * cc;
  }