Unity3D面试题-实现吊机吊物体的功能

最近忙着找Unity3D开发工程师的工作，看了一些面试题，看到这个，就写了一下，做个记录吧

题目：实现吊机吊物体的功能

没有详细说明怎么做，那么就写一个简单点的吧 先附上 效果图——



上面做了个横梁，上面一块Cube作为钩子，下面的Cube作为要吊起的重物，中间的绳子用Capsule

思路：鼠标左右滑动实现钩子的左右滑动，松开鼠标---钩子下滑，当钩子等撞到重物的时候停止下降 并带着重物一同上升，回到一定高度后，开始水平回到初始位置，并判断（是否勾住重物）如果勾住重物了 ，在原点位置，下降 然后放下重物，如果没勾住重物 则再远点不动，等待第二次操作。

在每次操作的过程中，不能进行第二次操作

结构：



上代码：

QizhongjiCS.cs控制钩子的滑动、钩子的下降、上升

using UnityEngine;
using System.Collections;

public class QizhongjiCS : MonoBehaviour {
private float dianX = 0;
public GameObject hook;
private float yuandianX;
private Vector3 hookV;
private int flag=0;
private delegate void HookMove();
private  HookMove _hookMove=null;
private int speed=3;

public HookZhongWu hzw;
private int zwFlag=0;
private GameObject zhongwu;                 //抓住的重物;

public GameObject shengzi;
public GameObject heng;
// Use this for initialization
void Start () {
hookV = hook.transform.localPosition;
yuandianX = hookV.x;
}

// Update is called once per frame
void Update () {
if (flag == 0) {
if (Input.GetMouseButtonDown(0))
{
dianX = Input.mousePosition.x;
}
else if (Input.GetMouseButton(0))
{
float dx = Input.mousePosition.x - dianX;
if (Mathf.Abs(dx) > 0.1f)
{

hookV.x = yuandianX + dx / 32;
if (hookV.x > -6 && hookV.x < 6)
{
hook.transform.localPosition = hookV;
}

}

}
else if (Input.GetMouseButtonUp(0))
{
//yuandianX = hookV.x;
flag = 1;
_hookMove = hookDown;
StartCoroutine(downZhua());
}
}
}
IEnumerator downZhua() {
yield return new WaitForSeconds(0.01f);
//1、向下移动， +speed
//2、判断移动的位置 如果大于某个位置 ，返回 speed为负
if (_hookMove != null)
{
_hookMove();
yield return StartCoroutine(downZhua());
}
else {
yield return null;
}

//3、判断移动回到原点    整个钩子向原始位置水平运动

//4、判断钩子回到原点   停止协程  flag=0
yield return StartCoroutine(downZhua());
}
void hookDown() {
hook.transform.Translate(Vector3.down * Time.deltaTime * speed);
changeShengZi();
if (hook.transform.localPosition.y < -2) {
if (zwFlag == 1) {
zhongwu.transform.parent = null;
zhongwu = null;
zwFlag = 0;
}
_hookMove = hookUp;
}
}
void hookUp()
{
hook.transform.Translate(Vector3.up * Time.deltaTime * speed);
changeShengZi();
if (hook.transform.localPosition.y >3.2)
{

_hookMove = HMove;

}
}
void HMove()
{

hook.transform.Translate(Vector3.left * Time.deltaTime * speed);

if (hook.transform.localPosition.x <=-4.5)
{
if (zwFlag == 0)
{
flag = 0;
_hookMove = null;
}
else {
_hookMove = hookDown;
}

}
}
public void zhuaZhongWu(GameObject zhongwu) {
_hookMove = hookUp;
zwFlag = 1;
this.zhongwu = zhongwu;
}
void changeShengZi() {
Vector3 hookPosition = hook.transform.position;
Vector3 hengliangP = heng.transform.position;
float dy = hookPosition.y - hengliangP.y;
Vector3 shengziP = shengzi.transform.position;
shengziP.y = hengliangP.y + dy / 2;
shengzi.transform.position = shengziP;

//改变 绳子长度
Vector3 shengziSclae = shengzi.transform.localScale;
shengziSclae.y = dy/2;
shengzi.transform.localScale = shengziSclae;
}
}

----------------------------------------------

HookZhongWu.cs用来判断 钩子是否和重物碰撞

碰上的时候 将重物设置成钩子的子对象 就可以实现带着往上升的效果了

using UnityEngine;
using System.Collections;

public class HookZhongWu : MonoBehaviour {
public QizhongjiCS qzj;
void OnTriggerEnter(Collider collision)
{//当碰撞时
print("OnTriggertEnter+" + collision.gameObject.name);
if (collision.gameObject.name == "zhongwu") {
collision.gameObject.transform.parent = this.gameObject.transform;
Vector3 v = collision.gameObject.transform.localPosition;
v.y = -1.2f;
collision.gameObject.transform.localPosition = v;
qzj.zhuaZhongWu(collision.gameObject);
}
}
}