unity 一个UI对象上下移动，移动速度符合余弦曲线

public GameObject lightpoint;  //上下移动的ui对象
private float starttime = 0.0f;
private float downpoint = -71.0f;  //实际情况来定
private float toppoint = 100.0f;   //实际情况来定
private float movetime = 2.0f;


void Update () {

        if (Time.time - starttime < movetime)
        {
            float temp = (Time.time - starttime) / movetime;
            lightpoint.transform.localPosition = new Vector3(lightpoint.transform.localPosition.x, easeInSine(downpoint, toppoint, temp), lightpoint.transform.localPosition.z);

        }
        else
        {
            starttime = Time.time;
        }
}


public static float easeInSine(float start, float end, float value)
{
        end -= start;
        return -end * Mathf.Cos(value / 1 * (Mathf.PI / 2)) + end + start;
}

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 FR:徐海涛（hunk Xu）
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