Double jumping

Questions & Answers
1

Hi! I am new to unity coding and i am developing my first 2D game. But I am stuck on how to make my character double jump. I am currently on Unity 5. Can someone explain to me how it could be done with my current jumping script?

Script:

using UnityEngine;
using System.Collections;

public class Jump : MonoBehaviour {

public float jumpHeight;
private bool isJumping = false;

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {
	//Jumping Section
	if (Input.GetKeyDown (KeyCode.Space)) 
	{
		if (isJumping == false) 
		{
			gameObject.GetComponent<Rigidbody2D> ().AddForce (Vector2.up * 500);
			isJumping = true;
		}

	}
}

//this bit is to check if the object that collided with it has the ground tag
void OnCollisionEnter2D(Collision2D col)
{
  if (col.gameObject.tag == "Ground") 
	{
		isJumping = false;
	}
}

}

2

One way you can do this is to set a variable to keep track of if they have second jumped yet.

 public float jumpHeight;
 private bool isJumping = false;
 private bool isJumping2 = false;
 
 // Use this for initialization
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
     //Jumping Section
     if (Input.GetKeyDown (KeyCode.Space)) 
     {
         if (isJumping == false) 
         {
             gameObject.GetComponent<Rigidbody2D> ().AddForce (Vector2.up * 500);
             isJumping = true;
         }
         else if (!isJumping2)
         {
            AddMoreForce & isJumping2 = true;
         }
 
     }
 }
 
 //this bit is to check if the object that collided with it has the ground tag
 void OnCollisionEnter2D(Collision2D col)
 {
   if (col.gameObject.tag == "Ground") 
     {
         isJumping = false;
         isJumping2 = false;
     }
 }
3

hi i recently made my own jump function and i try adding in a double jump function but it seems like it
wont jump only twice it will do infinite jump in the air how would i only make it jump twice

heres the code

using UnityEngine;
using System.Collections;

public class PlayerControl : MonoBehaviour {

public bool jump = false;        // if it jumps
public bool doublejump;        // if it jumps

public float jumpForce = 0.2f;                     // how high the player jump
public float doublejumpForce = 0.2f;         // how high the player jump
private Transform groundCheck;                // if the player is on ground
private bool grounded = false;                       // weather the player is on ground or not 

void Start ()
{
    // finding a ground layer called "groundCheck"
    groundCheck = transform.Find("groundCheck");
}

void Update()
{
    // if linecast hits a groundcheck then the player is on the ground
    grounded = Physics2D.Linecast(transform.position, groundCheck.position, 1 <<               LayerMask.NameToLayer("Ground"));

    if (Input.GetButtonDown("Jump") && grounded)
        jump = true;

    if (Input.GetButtonDown("Jump") && !grounded && !doublejump)
        jump = true;
    
}

void FixedUpdate()
{
    // if the player will jump 
    if (jump)
    {
        // add vertical force to the player
        GetComponent<Rigidbody2D>().AddForce(new Vector2(0f, jumpForce));

        // when the player has just land on the ground it needs to wait before it can jump again
        jump = false;
    }

 else  if (doublejump)
    {
        // add vertical force to the player
       GetComponent<Rigidbody2D>().velocity.y(new Vector2(0f, jumpForce));

        // when the player has just land on the ground it needs to wait before it can jump again
        jump = false;
    }

}