unity绘制弧线 unity绘制一条流动的弧线（贝塞尔线）

public Transform[] controlPoints;
public LineRenderer lineRenderer;
public float centerPoint =0.1f;

private int layerOrder = 0;
//生成弧线中间的点数
private int _segmentNum = 20;

//偏移
float m_offset;
float m_speed = 0.5f;

void Start()
{
 if (!lineRenderer)
 {
  lineRenderer = GetComponent<LineRenderer>();
 }
 lineRenderer.sortingLayerID = layerOrder;
 //调用画贝斯尔线
 GetBeizerList(controlPoints[0].position, (controlPoints[0].position + controlPoints[1].position) * 0.5f + new Vector3(0, centerPoint, 0), controlPoints[1].transform.position, _segmentNum);
}

private void Update()
{
 m_offset = m_offset - m_speed * Time.deltaTime;
 //控制offset使材质移动
 GetComponent<LineRenderer>().material.mainTextureOffset = new Vector2(m_offset, 0);
}

/// <summary>
/// 根据T值，计算贝塞尔曲线上面相对应的点
/// </summary>
/// <param name="t"></param>T值
/// <param name="p0"></param>起始点
/// <param name="p1"></param>控制点
/// <param name="p2"></param>目标点
/// <returns></returns>根据T值计算出来的贝赛尔曲线点
private static Vector3 CalculateCubicBezierPoint(float t, Vector3 p0, Vector3 p1, Vector3 p2)
{
 float u = 1 - t;
 float tt = t * t;
 float uu = u * u;

 Vector3 p = uu * p0;
 p += 2 * u * t * p1;
 p += tt * p2;

 return p;
}

/// <summary>
/// 获取存储贝塞尔曲线点的数组
/// </summary>
/// <param name="startPoint"></param>起始点
/// <param name="controlPoint"></param>控制点
/// <param name="endPoint"></param>目标点
/// <param name="segmentNum"></param>采样点的数量
/// <returns></returns>存储贝塞尔曲线点的数组
public Vector3[] GetBeizerList(Vector3 startPoint, Vector3 controlPoint, Vector3 endPoint, int segmentNum)
{
 Vector3[] path = new Vector3[segmentNum];
 for (int i = 1; i <= segmentNum; i++)
 {
  float t = i / (float)segmentNum;
  Vector3 pixel = CalculateCubicBezierPoint(t, startPoint,
   controlPoint, endPoint);
  //设置lineRenderer的control Points
  lineRenderer.positionCount = i;
  lineRenderer.SetPosition(i - 1, pixel);
  //存储Point
  path[i - 1] = pixel;
  Debug.Log(path[i - 1]);
 }
 return path;
}