[游戏开发]Unity功能 扣血 贝塞尔曲线

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;
using UnityEngine.UI;

public class TextHp : MonoBehaviour
{
    private float _times = 0.5F;
    private float _pointCount = 5F;
    private float _distance = 0.25F;
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.A))
        {
            DoAnim(-6,1);
        }
    }
    //参数1：掉血值 ，2：1为向右，-1为向左
    public void DoAnim(int subHp, int dir)
    {
        this.GetComponent<Text>().text = string.Format("-{0}", subHp);
        Vector3[] pathvec = Bezier2Path(transform.position, transform.position + new Vector3(_distance * dir, 0.5F, 0), transform.position + new Vector3(_distance * 2 * dir, 0, 0));
        transform.DOPath(pathvec, _times).SetEase(Ease.Linear).OnComplete(() => { Destroy(gameObject); });
    }

    //获取二阶贝塞尔曲线路径数组
    private Vector3[] Bezier2Path(Vector3 startPos, Vector3 controlPos, Vector3 endPos)
    {
        Vector3[] path = new Vector3[(int)_pointCount];
        for (int i = 1; i <= _pointCount; i++)
        {
            float t = i / _pointCount;
            path[i - 1] = Bezier2(startPos, controlPos, endPos, t);
        }
        return path;
    }

    // 2阶贝塞尔曲线
    public static Vector3 Bezier2(Vector3 startPos, Vector3 controlPos, Vector3 endPos, float t)
    {
        return (1 - t) * (1 - t) * startPos + 2 * t * (1 - t) * controlPos + t * t * endPos;
    }

    // 3阶贝塞尔曲线
    public static Vector3 Bezier3(Vector3 startPos, Vector3 controlPos1, Vector3 controlPos2, Vector3 endPos, float t)
    {
        float t2 = 1 - t;
        return t2 * t2 * t2 * startPos
            + 3 * t * t2 * t2 * controlPos1
            + 3 * t * t * t2 * controlPos2
            + t * t * t * endPos;
    }
}