如何將隨機預製分配給3個隨機公共vector2之一？

Question

我一直在努力想弄清楚如何爲3個可能的位置之一指定一個正確的預製件（當前是一個按鈕），另外2個位置是從一個不正確的預製件（也包括按鈕）中選擇的一個不正確的預製陣列。

由於原型是基於UI的，因此我只使用Canvas。

將不勝感激任何幫助，因爲我無法想象如何這應該工作，儘管多次嘗試。

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

public class Testing : MonoBehaviour { 


    //3 locations where the options are to appear 
    Vector2[] positions; 
    public Vector2 leftPosition; 
    public Vector2 middlePosition; 
    public Vector2 rightPosition; 

    //list the possible options (iconPrefab) to choose from in an array 
    public List<Transform> optionPrefab = new List<Transform>(); 
    int optionPrefab_num; 

    //state which option is correct for this scene 
    public Transform correctOption; 



void start() 
{ 
    correctOption = Random.Range (0, 2); 

    positions = new Vector2[3]; 
    leftPosition = positions [Random.Range (0, positions.Length)]; 


    middlePosition = positions [Random.Range (0, positions.Length)]; 
    rightPosition = positions [Random.Range (0, positions.Length)]; 

    Instantiate (correctOption [0], //....to one of the 3 positions listed above); 

} 

Answer 1

如果問題太難了，可以逐步解決。我想，你需要位置的字段和改造公共

實例化的東西在給定的位置：

using UnityEngine; 
using System.Collections; 

public class Spawn : MonoBehaviour 
{ 
    public Vector3 Position; 
    [SerializeField] 
    GameObject ThingToSpawn; 
    void Start() 
    { 
     if (ThingToSpawn == null) 
     { 
      Debug.LogError ("ThingToSpawn is null for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     Instantiate (ThingToSpawn,Position,Quaternion.identity); 
    } 
} 

實例化的東西在隨機位置之一：

using UnityEngine; 
using System.Collections; 

public class Spawn : MonoBehaviour 
{ 
    public Vector3[] Positions; 
    [SerializeField] 
    GameObject ThingToSpawn; 
    void Start() 
    { 
     if (ThingToSpawn == null) 
     { 
      Debug.LogError ("ThingToSpawn is null for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     Instantiate (ThingToSpawn,Positions[Random.Range(0,3)],Quaternion.identity); 
    } 
} 

隨機選擇三個位置和實例隨機一個東西。我不確定擁有一個公開的轉換列表是一個很好的解決方案，但是Unity對於構造函數並不適用。 （如果你只在檢查assing它，使它私人和使用[SerializeField]）

using UnityEngine; 
using System.Collections; 
using System.Collections.Generic; 
using System.Collections.ObjectModel; 
using System.Linq; 

public class Spawn : MonoBehaviour 
{ 
    public ReadOnlyCollection<Vector3> Positions; 
    public List<Transform> Transforms=new List<Transform>(); 
    [SerializeField] 
    GameObject ThingToSpawn; 
    void Start() 
    { 
     if (ThingToSpawn == null) 
     { 
      Debug.LogError ("ThingToSpawn is null for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     if (Transforms == null) 
     { 
      Debug.LogError ("Transforms variable is null for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     if (Transforms.Count == 0) 
     { 
      Debug.LogError ("No transforms provided for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     var positionsList = 
      Enumerable.Range (0, 3) 
       .Select (i => Transforms [Random.Range (0, Transforms.Count)].position) 
       .ToList(); 
     Positions = new ReadOnlyCollection<Vector3> (positionsList); 

     Instantiate (ThingToSpawn,Positions[0],Quaternion.identity); 
    } 
} 

選擇三個位置隨機。在其中一個實例化任意東西。檢查哪些是正確的，哪些是中間的，哪些是剩餘的，但不關心重疊。

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

public class Spawn : MonoBehaviour 
{ 
    public List<Transform> Transforms=new List<Transform>(); 
    public Vector3 LeftPosition{ get; private set;} 
    public Vector3 MiddlePosition{ get; private set;} 
    public Vector3 RightPosition{ get; private set;} 
    [SerializeField] 
    GameObject ThingToSpawn; 
    void Start() 
    { 
     if (ThingToSpawn == null) 
     { 
      Debug.LogError ("ThingToSpawn is null for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     if (Transforms == null) 
     { 
      Debug.LogError ("Transforms variable is null for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     if (Transforms.Count == 0) 
     { 
      Debug.LogError ("No transforms provided for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     var Positions = 
      Enumerable.Range (0, 3) 
       .Select (i => Transforms [Random.Range(0,Transforms.Count)].position) 
       .OrderBy (i => i.x) 
       .ToList(); 
     LeftPosition = Positions [0]; 
     MiddlePosition = Positions [1]; 
     RightPosition = Positions [2]; 
     Instantiate (ThingToSpawn,new[]{LeftPosition,MiddlePosition,RightPosition}[Random.Range(0,3)],Quaternion.identity); 
    } 
} 

和上面一樣，但是要注意重疊。分爲兩個文件

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

public class Spawn : MonoBehaviour 
{ 
    public List<Transform> Transforms=new List<Transform>(); 
    public Vector3 LeftPosition{ get; private set;} 
    public Vector3 MiddlePosition{ get; private set;} 
    public Vector3 RightPosition{ get; private set;} 
    [SerializeField] 
    GameObject ThingToSpawn; 
    void Start() 
    { 
     if (ThingToSpawn == null) 
     { 
      Debug.LogError ("ThingToSpawn is null for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     if (Transforms == null) 
     { 
      Debug.LogError ("Transforms variable is null for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     if (Transforms.Count <= 3) 
     { 
      Debug.LogError ("Less than 3 transforms provided for instance of Spawn.cs at "+transform.name); 
      return; 
     } 
     var Positions = 
      Enumerable.Range (0, 3) 
       .RandomShuffle() 
       .Take(3) 
       .Select (i => Transforms [i].position) 
       .OrderBy (i => i.x) 
       .ToList(); 
     LeftPosition = Positions [0]; 
     MiddlePosition = Positions [1]; 
     RightPosition = Positions [2]; 
     Instantiate (ThingToSpawn,new[]{LeftPosition,MiddlePosition,RightPosition}[Random.Range(0,3)],Quaternion.identity); 
    } 
} 

在RNGUtils.cs。使用Fisher-Yates算法

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

public static class RNGUtils 
{ 
    static void SwapListElements<T>(IList<T> list, int firstIndex, int secondIndex) 
    { 
     T tmp = list[firstIndex]; 
     list[firstIndex]=list[secondIndex]; 
     list[secondIndex]=tmp; 
    } 
    public static IList<T> RandomShuffle<T>(this IEnumerable<T> enumerable) 
    { 
     List<T> res = enumerable.ToList(); 
     for (int i = 0; i < res.Count; ++i) 
     { 
      SwapListElements (res,i,Random.Range(i,res.Count)); 
     } 
     return res; 
    } 
} 

正如你可以看到，上述兩種使用語法new[]{a,b,c}[]最後的解決方案。 It is valid.您提到的錯誤很可能是編譯器錯誤。他們通常可以通過搜索他們的名字和錯誤代碼來逐個修復。

在您的代碼中，您將int指定爲Transform，並發現了一些可以通過查看編譯器錯誤來解決的其他錯誤。我建議你從像spoj/project euler這樣的網站解決幾十個最簡單的任務，不要犯基本錯誤。我每次學習新的編程語言時都會使用它們

希望這有助於！