Unity2D中的DoubleJumping限制

Question

查看關於Unity的幫助論壇，我很快發現我所看到的語法確實過時了（同樣的事情在這裏：Unity Doublejump in C#）。

下面是我在談論的文章： http://answers.unity3d.com/questions/753238/restrict-number-of-double-jumps.html

例如，在虛空中清醒（），在Unity的當前版本我使用的，它說，rigidbody2D.fixedAngle = TRUE;不再受支持，我需要對我正在嘗試編程的gameObject使用約束（我應該使用哪個軸... x，y或z？）。在完成一些編輯之後，查看錯誤消息後，我可以將所有的rigidbody2D.velocity改爲更新的語法，即GetComponent（）.velocity。

這裏是我的代碼：

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

    public class NewBehaviourScript : MonoBehaviour { 

public float speed = 6.0f; 
//public float j 
Transform groundCheck; 
//private float overlapRadius = 0.2f; 
public LayerMask whatisGround; 
private bool grounded = false; 
private bool jump = false; 
public float jumpForce = 700f; 
private bool doubleJump = false; 
public int dJumpLimit = 5; 

void Start() 
{ 
    groundCheck = transform.Find ("groundcheck"); 
    PlayerPrefs.SetInt ("doublejumps", dJumpLimit); 
} 

void Update() 
{ 
    if (Input.GetKey(KeyCode.Space)) 
    { 
     jump = true; 
    } 
    //perhaps put A and D here? 
} 
void FixedUpdate() 
{ 
    //to check if Mario is on the ground 

    //overlap collider replace Overlap Circle??? 
    //overlap point?? 
    //grounded = GetComponent<Rigidbody2D>().OverlapCollision(groundCheck.position, overlapRadius, whatisGround); 

    if (grounded) 
     doubleJump = false; 

    if (dJumpLimit < 1) 
     doubleJump = true; 

    bool canJump = (grounded || !doubleJump); 

    if (jump && canJump) { 
     GetComponent<Rigidbody2D>().velocity = new Vector2 (GetComponent<Rigidbody2D>().velocity.x, 0); 
     GetComponent<Rigidbody2D>().AddForce (new Vector2 (0, jumpForce)); 

     if (!doubleJump && !grounded) { 
      doubleJump = true; 
      dJumpLimit--; 

     } 

    } 

     jump = false; 


     //code that will work with the limits? 
     //GetComponent<Rigidbody2D>().velocity = new Vector2(speed,GetComponent<Rigidbody2D>().velocity.y); 

     //this will make it stack? 
     //GetComponent<Rigidbody2D>().velocity = new Vector2(speed,GetComponent<Rigidbody2D>().velocity.x); 
     //GetComponent<Rigidbody2D>().velocity = new Vector2(speed,GetComponent<Rigidbody2D>().velocity.y); 
    } 

} 

好處是，它能夠在最後進行編譯。但是我仍然不知道約束是如何工作的（它們抵抗x，y，z軸上的運動？）。跳轉仍然沒有頂點，並且變量dJumpLimit似乎不會停止所有跳轉！我試圖破譯布爾人想要完成的工作也遇到了很多麻煩，如果你告訴我什麼是過時的代碼試圖做什麼，以及我做了什麼失敗，這將有很大的幫助。這將幫助我很多。非常感謝您的幫助！

Answer 1

我已經添加了相同的代碼和一些額外的評論來幫助你。

的基本思想是允許在一定條件下跳，並允許在某些其他條件雙跳，

嘗試邏輯想想，馬里奧可以當他是在地面上，只有跳，所以我們需要檢查每幀。如果他接地，並且玩家按下空間，我們讓他跳。

現在，我們希望馬里奧能夠雙跳，但前提是他已經在空中（否則這只是一次常規跳躍），並且只有在他沒有在這次「當前」跳躍中雙跳時才能夠雙跳。

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

public class NewBehaviourScript : MonoBehaviour { 

    public float speed = 6.0f; 
    //public float j 
    Transform groundCheck; // For checking if grounded 
    //private float overlapRadius = 0.2f; // For checking if grounded 
    public LayerMask whatisGround; // A layer mask to distinguish what is considered as ground 
    private bool grounded = false; // True when Mario is touching ground 
    private bool jump = false;  // Flag to check when player intends to jump 
    public float jumpForce = 700f; // How much force we will apply to our jump 
    private bool doubleJump = false; // This becomes true once we have double-jumped 
    public int dJumpLimit = 5; // A limit to prevent too many jumps happening 

    void Start() 
    { 
     // Find the Transform called "groundcheck" 
     groundCheck = transform.Find ("groundcheck"); 
     // Set the PlayerPrefs integer called "doublejumps" to the value of dJumpLimit 
     PlayerPrefs.SetInt ("doublejumps", dJumpLimit); 
    } 

    void Update() 
    { 
     // If Space is being pressed... 
     if (Input.GetKey(KeyCode.Space)) 
     { 
      jump = true; // Set jump bool to true to indicate our intention to jump 
     } 
    //perhaps put A and D here? 
    } 

    void FixedUpdate() 
    { 
     //to check if Mario is on the ground - this is necessary so we can't jump forever 

     //overlap collider replace Overlap Circle??? 
     //overlap point?? 
     //grounded = GetComponent<Rigidbody2D>().OverlapCollision(groundCheck.position, overlapRadius, whatisGround); 

     // If Mario is touching ground... 
     if (grounded) 
      doubleJump = false; // Make sure that as we are grounded we are not allowed to "jump again" 

     if (dJumpLimit < 1) 
      doubleJump = true; 
     // Set a new bool to true if grounded is true OR doubleJump is false 
     bool canJump = (grounded || !doubleJump); 

     // If the player pressed space AND we are allowed to jump... 
     if (jump && canJump) { 
      // Apply existing x velocity to the x direction 
      GetComponent<Rigidbody2D>().velocity = new Vector2 (GetComponent<Rigidbody2D>().velocity.x, 0); 
      // Apply our jump force to the y direction 
      GetComponent<Rigidbody2D>().AddForce (new Vector2 (0, jumpForce)); 

     // If doubleJump is false AND we are not grounded... 
     if (!doubleJump && !grounded) { 
      doubleJump = true; // We have double jumped so set to true 
      dJumpLimit--; // Decrement one from dJumpLimit 
     } 
    } 

     jump = false; // Reset the jump bool to false 

     //code that will work with the limits? 
     //GetComponent<Rigidbody2D>().velocity = new Vector2(speed,GetComponent<Rigidbody2D>().velocity.y); 

     //this will make it stack? 
     //GetComponent<Rigidbody2D>().velocity = new Vector2(speed,GetComponent<Rigidbody2D>().velocity.x); 
     //GetComponent<Rigidbody2D>().velocity = new Vector2(speed,GetComponent<Rigidbody2D>().velocity.y); 
    } 
}