How to make character one time shoot in one direction ?

Unity Engine
1

Hey everyone,

I design a character can shoot in four direction: up down left right. By using four button: W S A D. The issue is that , when i push those buttons together the character can shoot in direction at same. But what i want is when i push one button the character only can shoot in that direction .I don`t want my character can shot in different directions at same time. How can i fix this.Please assist .
This is my code:

1896013–122103–Gun.cs (1.09 KB)

2

One solution could be to use else if (instead of 4 distinct if statements). The user must release the current button to be able to shoot into another direction.
e.g.

        if(Input.GetButtonDown("FireRight"))
        {
           Rigidbody2D bulletInstance = Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,0))) as Rigidbody2D;
            bulletInstance.velocity = new Vector2(speed, 0);
        }      
           else if(Input.GetButtonDown("FireLeft"))
        {
            Rigidbody2D bulletInstance = Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,180))) as Rigidbody2D;
            bulletInstance.velocity = new Vector2(-speed, 0);
        }
        else if(Input.GetButtonDown("FireUp"))
        {
            Rigidbody2D bulletInstance = Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,90))) as Rigidbody2D;
            bulletInstance.velocity = new Vector2(0, speed);
        }
        else if(Input.GetButtonDown("FireDown"))
        {
            Rigidbody2D bulletInstance = Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,270))) as Rigidbody2D;
            bulletInstance.velocity = new Vector2(0, -speed);
        }
3

Thanks for ur adivce. I tried ur code but it still can shoot different directions at same time.But ur idea is helpful. So i can make my button like this: disablle other three buttons when i push one.and active those button after i released. But i don`t know the codes which can disable and reactive buttons. If u know , could u teach me that. XD

4

Could you try

Input.GetKey

instead of

Input.GetButtonDown?

5

THX GetKey can …But the frequency is too short …i try to add some time delay …Thanks of ur help~XD

6

as much as I hate code duplication… a remake of your current script with some fire delay:

using UnityEngine;
using System.Collections;

public class Gun : MonoBehaviour {
    public Rigidbody2D bullet;           
    public float speed = 20f;
    public float fireDelay = 0.5f;
    private bool canFire = true;
   
    void Update()
    { 
        if(Input.GetButtonDown("FireRight") && (canFire))
        {
            Rigidbody2D bulletInstance = Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,0))) as Rigidbody2D;
            bulletInstance.velocity = new Vector2(speed, 0);
            canFire = false;
            Invoke("ToggleFire", fireDelay);
        }

        if (Input.GetButtonDown("FireLeft") && (canFire))
        {
            Rigidbody2D bulletInstance = Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,180))) as Rigidbody2D;
            bulletInstance.velocity = new Vector2(-speed, 0);
            canFire = false;
            Invoke("ToggleFire", fireDelay);
        }

        if (Input.GetButtonDown("FireUp") && (canFire))
        {
            Rigidbody2D bulletInstance = Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,90))) as Rigidbody2D;
            bulletInstance.velocity = new Vector2(0, speed);
            canFire = false;
            Invoke("ToggleFire", fireDelay);
        }

        if (Input.GetButtonDown("FireDown") && (canFire))
        {
            Rigidbody2D bulletInstance = Instantiate(bullet, transform.position, Quaternion.Euler(new Vector3(0,0,270))) as Rigidbody2D;
            bulletInstance.velocity = new Vector2(0, -speed);
            canFire = false;
            Invoke("ToggleFire", fireDelay);
        }           
    }

    void ToggleFire()
    {
        canFire = !canFire;
    }
}
7

Thank u very much!