How can I make a 2d sprite shoot the direction player is facing?

Question

I have a variable that checks if it is looking right or left (true = right, left = false), and I've tried the for hours to get it to "fire" the sprite ball in that direction after instantiating it, but it just doesn't work. I'm at the point where I just dont know what to do anymore. Have anyone had this problem with 2d shooting? If so I would appreciate it if you could share what you did.

TL;DR, I'm trying to make a ball fire the correct Z direction. Thank you!!

Answer 1

Hi,

Why don't you just do:

 public Sprite FireSprite;
     void Update () {
         if (Input.GetKeyDown ("a")) {
             Instantiate(FireSprite,transform.position,transform.rotation);}
     }

Attatch that script to the player (shooter)

Create another script and attatch it to the FireSprite :

 public int direction;
 
 void Start () {
             if (Player.DirectionFacing == "Right") {
                     direction = 1;    
     
             } else if (Player.DirectionFacing == "Left") {
                     direction = 2;

             }

     }

 void Update () {
     if (direction == 1) {
     
                     transform.Translate (0, 0, Time.deltaTime);
     
             } else if (direction == 2) {
             
         transform.Translate (0,0,-Time.deltaTime);
     }

 }

I didn't test the code so i don't know if it will work, let me know if it has any problem. I hope i could help.

Answer 2

Answer by bob1234 · Aug 12, 2014 at 02:00 PM

I have done like this: (this is in c#)

     public  Vector2 moving = new Vector2();
     bool lookRight;
 void Update()
 {
                 if(Input.GetKey("d"))
                 {
              moving.x = 1;
                 }
             if(Input.GetKey("a"))
                 { moving.x = -1;
                 }
             if(moving.x > 0)
             {
             lookRight = true;
             }else if(moving.x < 0)
             lookRight = false;
 }
             void Fireball()
             {
             if(lookRight)
             Rigidbody2D projectile = Instantiate(BubblePrefab, BubbleSpawn.position, BubbleSpawn.rotation) as Rigidbody2D;
             projectile.AddForce(vector3.right * 500)
             }else{
             Rigidbody2D projectile = Instantiate(BubblePrefab, BubbleSpawn.position, BubbleSpawn.rotation) as Rigidbody2D;
             projectile.AddForce(vector3.right * 500)
             }
     }

and then just call Fireball() where you have your keypress

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Madswint · Aug 12, 2014 at 02:06 PM 0

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It gives me

InvalidCastException: Cannot cast from source type to destination type. BasicAttack.Fireball () (at Assets/BasicAttack.js:23) BasicAttack.Update () (at Assets/BasicAttack.js:17)

bob1234 · Aug 12, 2014 at 02:13 PM 0

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Hmm, i'm not sure what it is, but what i wrote was in c# and it looks like ur using javascript, did u convert it or just copy paste?

Madswint · Aug 12, 2014 at 02:18 PM 0

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I converted it all and it's working now. Thank you. Do you have any idea on jumping as 2d? Here's my controls incase you can help

(move left and right, I need jump and perhaps doublejump)

 var maxSpeed = 5;
 static var FacingRight = true;
 private var myRigidbody : Rigidbody;
 
 function FixedUpdate () {
 var move = Input.GetAxis("Horizontal");
 
 rigidbody2D.velocity = new Vector2(move * maxSpeed, rigidbody2D.velocity.y);
 
 if (move > 0 && !FacingRight) 
 Flip();
 else if(move < 0 && FacingRight)
 Flip();
 }
 
 function Flip () {
 
 FacingRight = !FacingRight;
 
 var theScale : Vector3 = transform.localScale;
 theScale.x *= -1;
 transform.localScale = theScale;
 }

bob1234 · Aug 12, 2014 at 02:26 PM 0

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Yeah sure man, do

 int maxJump = 2;
 int jumpCount = 0;
 bool grounded;
 public float jumpForce = 325f;
 
 void FixedUpdate()
 {
 var absVelY = $$anonymous$$athf.Abs(rigidbody2D.velocity.y); // this takes the absolute value of the velocity's y value and returns a positive value, whatever its positive or negative
 
 if(absVelY < 0.02f)
 {
 grounded = true;
 }else
 {
 grounded = false;
 }
 if(grounded)
 {
 jumpCount = 0;
 }
 
 if(jumpCount < maxJump)
 {
 if(Input.Get$$anonymous$$eyDown("space"))
 {
 rigidbody2D.AddForce(new vector2 (0, jumpForce));
 jumpCount++;
 }
 }
 }

thats my jumping code i use

Madswint · Aug 12, 2014 at 03:36 PM 0

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It resets in air, do you have this problem too?

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How can I make a 2d sprite shoot the direction player is facing?

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