private void _InitRelationPoint(Transform relationPoint, LineRenderer relationLineRenderer, RelationLineController relationLineController, bool isStart)
{
RelationPointController relationPointController = relationPoint.GetComponent <RelationPointController> ();
Vector3 position = relationPoint.position;
relationLineRenderer.SetPosition(isStart ? 0 : 1, position);
relationLineController.SaveRelationPoint(relationPointController, isStart);
relationPointController.SaveRelationLine(relationLineRenderer, isStart);
}
