static IEnumerator ShotAndReturnTransverselyLineBullets(GameObject bulletPrefab, Vector3 position, Quaternion rotation, int bulletsNumber, float angle, float spownTime)
{
List <GameObject> bullets = new List <GameObject>();
float length = Mathf.Tan(angle * Mathf.Deg2Rad / 2) * 2; //数字横行的长度
float eulerZ = rotation.eulerAngles.z;
float startTime = Time.time;
for (int i = 0; i < bulletsNumber; i++)
{
float currentX = length / (bulletsNumber - 1) * i - length / 2;
Quaternion currentRotation = BarrageBase.GetAimRotation(Vector2.zero, new Vector2(currentX, 1));
currentRotation.eulerAngles = currentRotation.eulerAngles + new Vector3(0, 0, eulerZ);
GameObject bullet = GetInactiveBullet(bulletPrefab, position, currentRotation);
bullets.Add(bullet);
BulletMoveUp move = bullet.GetComponent <BulletMoveUp>();
move.speed = move.speed * Mathf.Sqrt(1 + currentX * currentX); //因为到中心点的距离是1，那么所有点的速度比例就和距离相同，直接乘上就行
float expectedTime = spownTime / bulletsNumber * i;
float elapsedTime = Time.time - startTime;
if (expectedTime > elapsedTime)
{
yield return(new WaitForSeconds(expectedTime - elapsedTime));
}
}
yield return(bullets.ToArray());
}
private void Awake()
{
_bulletMove = GetComponent <BulletMoveUp>();
}
