【unity學習筆記】unity實現鉤子功能

場景佈置

運行效果：

層次面板

實現方法

1. 使用LineRenderer作爲鉤鏈
   
   1. 在BeginPoint物體上添加LineRenderer組件，記得取消勾選 use world space

2. 使用小球（Hook）作爲鉤子

3. 當發射時對鉤子進行碰撞檢測

4. 檢測到敵人便將敵人作爲鉤子的子物體
   
   1. 添加膠囊體Enemy，並將tag設置”Enemy”

代碼部分

附件於Hand上

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Hook: MonoBehaviour
{

    public LineRenderer hookObj;                //鉤子起始點 附加有LineRenderer組件
    public float hookSpeed = 10f;               //鉤子發射速度
    public float totalDistance = 3f;            //鉤子最大長度
    public bool isOut = false;                  //鉤子發射或者收回標記
    public Transform hookTransform;             //鉤子物體（即小球）

    private Collider[] colCollection;           //發射中碰撞到的物體
    private float oriZvalue;                    
    private bool isStop = true;                 //用來判斷鉤子是否停止
    private float tempZvalue;
    // Use this for initialization
    void Start() {
        oriZvalue = hookTransform.localPosition.z;
        tempZvalue = oriZvalue;
    }

    // Update is called once per frame
    void Update() {
        checkCollider();                //檢測發射過程中碰到的碰撞體
        CheckLength();                  //檢測是否超過鉤子長度
        if (Input.GetKeyDown(KeyCode.H)) {
            isOut = true;
        }
        //發射鉤子
        if (isOut) {
            hookTransform.Translate(0, 0, hookSpeed * Time.deltaTime);
            hookObj.SetPosition(1, hookTransform.localPosition);
        }
        //收回鉤子
        else {
            if (hookTransform.localPosition.z > oriZvalue) {
                hookTransform.Translate(0, 0, -hookSpeed * Time.deltaTime);
                hookObj.SetPosition(1, hookTransform.localPosition);
            }
        }

        //判斷鉤子是否爲停止狀態
        if (hookTransform.childCount > 0) {
            isStop = Mathf.Abs(hookTransform.localPosition.z - tempZvalue) <= 0 ? true : false;
        }
        else
            isStop = false;
        //將敵人夠到身前後，放開鉤子
        if (isStop) RealeaseChild();
    }

    private void LateUpdate() {
        tempZvalue = hookTransform.localPosition.z;
    }
    void CheckLength() {
        if (Vector3.Distance(hookTransform.position, hookObj.transform.position) > totalDistance) {
            isOut = false;
        }
    }


    void checkCollider() {
        //對鉤子進行球形檢測，返回所有碰到或者在球範圍內的碰撞體數組     
        //注意將人稱控制器及其子物體的Layer修改爲不是Default的一個層，否則鉤子會檢測到自身的碰撞體
        colCollection = Physics.OverlapSphere(hookTransform.position, 0.2f, 1 << LayerMask.NameToLayer("Default"));
        if (colCollection.Length > 0) {
            foreach (Collider item in colCollection) {
                //將敵人的tag設置爲“Enemy”
                if (item.gameObject.tag.Equals("Enemy"))
                    item.transform.SetParent(hookTransform);
            }
            isOut = false;
        }
    }

    void RealeaseChild() {
        if (hookTransform.childCount > 0) {
            for (int i = 0; i < hookTransform.childCount; i++) {
                hookTransform.GetChild(i).transform.SetParent(null);
            }
        }
    }
}

附加於Enemy上 進行pingpong運動

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Enemymove : MonoBehaviour {

    public float moveSpeed = 3;
    public float zVlaue=5;

    private Vector3 ori;
    private float timer = 0;
    private Vector3 targetPoi = Vector3.zero;
    private Quaternion oriRot;
    // Use this for initialization
    void Start () {
        ori = transform.position;
        oriRot = transform.rotation;
    }

    // Update is called once per frame
    void Update () {
        //當沒被鉤中時，進行pingpong運動
        if (transform.parent == null) {
            transform.rotation = oriRot;            //更新爲初始旋轉，否則在放鉤後旋轉會改變
            timer += Time.deltaTime*2;
            zVlaue = Mathf.PingPong(timer, 7);
            targetPoi = transform.right * zVlaue;
            transform.position = ori + targetPoi;
        }
        //當背鉤中時
        else {
            ori = new Vector3(transform.position.x, 0.98f, transform.position.z);
            timer = 0;
        }
    }
}

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完