2D Plataformer: Character doesn't Flip after Walljump . C#

Question

Hi, I'm a beginner in Unity, and I'm making a 2D plataformer and I'm having problems with Fliping the character after a Walljump.

I coded the walljump so the character jumps in a diagonal direction opposite to the wall. (Similar to the New Super Mario Bros).

The WallJump action works, but it doesn't flip the character when it does it.

Here is avideo showing the problem: Video

This is the function I use to flip the character.

     // Function FLIP
     void Flip()
     {       
         Vector2  newScale = graphics.localScale; // this is a child object that cntains all the Sprites and animations of the character.
         newScale.x *= -1;
         graphics.localScale = newScale;
         frontOffset.x = -frontOffset.x;  // this is the position of the Wall Jump Collider
 
         facingRight = !facingRight;    
     }

And this is the statement I use to call the Flip() function. This line of code is inside of FixedUpdate:

         // INPUT
          move = Input.GetAxis("Horizontal") ;
 
          //FLIP
         if (move > 0 && !facingRight) Flip();
         else if (move < 0 &&  facingRight) Flip();

For the WallJump I use this function.

     void wallJump()
     {
         rb.velocity = new Vector2(xWallForce * -move , yWallForce);         
         wallJumpCounter = wallJumpTime;
     }

and this line of code for calling the function, this is inside Update():

             //WALL JUMP
             if(Input.GetButtonDown("Jump") && wallSliding)
             {
                 wallJump();      
             }

For more context here is the rest of the code.

 using System;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlayerBehave : MonoBehaviour 
 
 {
     // Character controller
     [Header("Controller")]
     private Rigidbody2D rb;
     public float move;
     public float speed;
 
 
     public float maxSpeed;
 
     [Header("Jump")]
     public float airSpeed;
     public float jumpForce;
     public float gravityForce;
     //this is a JumpKey
     public float fallMultiplaier;
     public float jumpDelay = 1;
     public float jumpTimer;
 
     // Grafics
     [Header("Graphics")]
     public Transform graphics;
     public bool facingRight;
     public Animator anim;
 
     // Ground Checker
     [Header ("GroundChecker")]
     public Transform groundTransform;
     public bool isGrounded;
     public LayerMask groundMask;
     public float groundLenght = 0.6f;
     public Vector3 colliderOffset;
     
     [Header("WallJumpChecker")]
     public bool isTouchingFront;
     public Vector3 frontOffset;
     public bool wallSliding;
     public float wallSlidingSpeed;
     public Vector2 wallCheckSize;
 
     [Header("WallJump")] 
     public bool isWallJump;   
     public float wallJumpTime;
     private float wallJumpCounter;    
     public float xWallForce;
     public float yWallForce;
     
 
     // Start is called before the first frame update
     void Start()
     {
         Application.targetFrameRate = 60;
         rb = GetComponent<Rigidbody2D>();
         facingRight = true;
         maxSpeed = speed * 3;
         airSpeed = speed * 2;
     }
 
     void FixedUpdate()
     {
         //GROUNDED
         isGrounded = Physics2D.Raycast(transform.position + colliderOffset, Vector2.down, groundLenght, groundMask) || Physics2D.Raycast(transform.position - colliderOffset, Vector2.down, groundLenght, groundMask);
 
         // TOUCHING WALL
         isTouchingFront = Physics2D.OverlapBox(transform.position + frontOffset, wallCheckSize,0, groundMask);
   
         //JUMP INPUT
         if(jumpTimer > Time.time && isGrounded){
             Jump();
         }
 
         // INPUT
          move = Input.GetAxis("Horizontal") ;
 
          //FLIP
         if (move > 0 && !facingRight) Flip();
         else if (move < 0 &&  facingRight) Flip();  
 
     }
 
     // Update is called once per frame
     void Update()
     {
         if(wallJumpCounter <= 0)
         {
     
             //MOVEMENT
             if(isGrounded)
             {
                 rb.velocity = new Vector2(move * speed, rb.velocity.y); 
             }
             else if (!isGrounded && !wallSliding && move !=0)
             {
                 rb.AddForce(new Vector2(airSpeed*move,0));
 
                 if(Mathf.Abs(rb.velocity.x)>maxSpeed)
                 {
                     rb.velocity = new Vector2(move * speed, rb.velocity.y); 
                 }
 
             }
 
             //GRAVITY
             if(isGrounded){
                 rb.gravityScale = 0;
             }else
             {
                 rb.gravityScale = gravityForce;
                 if(rb.velocity.y < 0){
                     rb.gravityScale = gravityForce * fallMultiplaier;
                 }else if (rb.velocity.y > 0 && !Input.GetButton("Jump"))
                 {
                     rb.gravityScale = gravityForce * (fallMultiplaier / 2);
                 }
             }
             
             //JUMP Timer
             if (Input.GetButtonDown("Jump") && isGrounded )
             {
                 jumpTimer = Time.time + jumpDelay;  // esto hace que el jumpTimer se active
             }
 
             // WALL     sliding
             if(isTouchingFront == true && isGrounded == false && move != 0)
             {
                 wallSliding = true;
             } else{
                 wallSliding = false;
             }
 
             if (wallSliding)
             {
                 rb.velocity = new Vector2(rb.velocity.x, Mathf.Clamp(rb.velocity.y, -wallSlidingSpeed, float.MaxValue));
             }
   
             //WALL JUMP
             if(Input.GetButtonDown("Jump") && wallSliding)
             {
                 wallJump();      
             }
        
         }
         else
         {
             wallJumpCounter -= Time.deltaTime;
         }    
         
     }
 
     //FUNCTIONS -------------------------------------------------------------------------------------------
 
     // Character movement
     void Jump()
     {
         rb.AddForce(Vector2.up * jumpForce, ForceMode2D.Impulse);
          jumpTimer = 0;
     }
 
     // Function FLIP
     void Flip()
     {       
         Vector2  newScale = graphics.localScale; // this is a child object that cntains all the Sprites and animations of the character.
         newScale.x *= -1;
         graphics.localScale = newScale;
         frontOffset.x = -frontOffset.x;  // this is the position of the Wall Jump Collider
 
         facingRight = !facingRight;    
     }
 
     void wallJump()
     {
         rb.velocity = new Vector2(xWallForce * -move , yWallForce);         
         wallJumpCounter = wallJumpTime;
     }
   
 
     //gIZMOS FOR THE COLLAIDERS
     private void OnDrawGizmos(){
         //GROUND_CHECKER
          Gizmos.color = Color.blue;
          Gizmos.DrawLine(transform.position + colliderOffset, transform.position + colliderOffset + Vector3.down * groundLenght); 
          Gizmos.DrawLine(transform.position - colliderOffset, transform.position - colliderOffset + Vector3.down * groundLenght);
          //                                                                     
         //WALL JUMP CHECKER
         Gizmos.color = Color.green;
         Gizmos.DrawCube(transform.position + frontOffset, wallCheckSize);              
     }
   
 }

Sorry for the lengthy post, but I have no idea why it doesn't flip.

I made this code following tutorials, and I try to understand everything I code. So I'm pretty sure this code is a isn't the best.

Any help is welcome.

Answer 1

Best Answer

Answer by ReceptiveRaptor · Mar 26, 2021 at 10:37 PM

      void Flip()
      {       
          Vector2  newScale = graphics.localScale; // this is a child object that cntains all the Sprites and animations of the character.
          newScale.x *= -1;
          graphics.localScale = newScale;
          frontOffset.x = -frontOffset.x;  // this is the position of the Wall Jump Collider
  
          facingRight = !facingRight;    
      }

As of Unity 5.3, there is built-in "Flip" support. Just check whether you want to flip by X, Y, or both.

SpriteRenderer inspector

In code, you would just assign true/false to SpriteRenderer.flipX and .flipY.

Credit to @JoeStrout

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andresnieto · Mar 27, 2021 at 02:05 PM 0

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I changed the line of graphics for the SpriteRenderer.flipX and it works, it flips when the character walks and jumps:

     void Flip()
     {       
         sprites.flipX = !sprites.flipX;
         
         frontOffset.x = -frontOffset.x;  // this is the position of the Wall Jump Collider
 
         facingRight = !facingRight;    
     }

Still doesn't flip when it walljumps. But I think I know where is the problem. I will post it later.

ReceptiveRaptor andresnieto · Mar 27, 2021 at 06:03 PM 0

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Test reply

OK that was annoying, I was being told that I can't reply twice to an answer.

You need to reference the Sprite Renderer component. Your original code was probably fine, just needed to replace the local scale stuff with the flip x method

https://docs.unity3d.com/ScriptReference/SpriteRenderer-flipX.html

Check this page for more info. I would double check the script myself but it's 4 am

andresnieto ReceptiveRaptor · Mar 29, 2021 at 12:03 PM 0

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Ok, I'm not sure if this is what you meant but it works!

             //WALL JUMP
             if(Input.GetButtonDown("Jump") && wallSliding)
             {              
                 wallJump();
                 sprites.flipX = !sprites.flipX;
             }
 
             //WALL JUMP FLIP
 
             if(isGrounded && move < 0 || isGrounded && move > 0) sprites.flipX = false;
             else if(!isGrounded && Input.GetButtonDown("Horizontal") || !isGrounded && Input.GetButtonDown("Horizontal")) sprites.flipX = false;

I also put a flipX = false in the Flip() function.

     // Function FLIP
     void Flip()
     {       
         Vector2  newScale = graphics.localScale; // this is a child object that cntains all the Sprites and animations of the character.
         newScale.x *= -1;
         graphics.localScale = newScale;
 
         sprites.flipX = false;
         
         frontOffset.x = -frontOffset.x;  // this is the position of the Wall Jump Collider
 
         facingRight = !facingRight;  
     }

The only object that doesn't flip is the wallslider collider, but I think it doesn't matter because the player has to move towards the wall in order to activate the wallsliding.

I will continue the testing but at first glance it seems to be working.

If there is a better way to code this any suggestion is welcome.

@ReceptiveRaptor Thank you very much!

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2D Plataformer: Character doesn't Flip after Walljump . C#

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