shoot the monsters,but i just only shoot at right.

when i press down the button,it will be start to shoot projectiles,but just only shoot projectiles at right.the character can't to shoot at left.What should i do? Anyone can help me ?or getting some idea!Thanks!!
bulletmove:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Shooting : MonoBehaviour {
5.  
6.     public GameObject Rock;
7.  
8.     // Use this for initialization
9.     void Start () {
10.    
11.     }
12.    
13.     // Update is called once per frame
14.     void Update () {
15.         if (Input.GetKeyDown (KeyCode.Z)) {
16.             //Rigidbody clone;
17.             Instantiate (Rock, transform.position,new Quaternion(0,0,0,0));
18.             //clone.velocity = transform.TransformDirection (Vector3.forward * 10);
19.         }
20.         if (Input.GetKeyDown (KeyCode.X)) {
21.             Instantiate (Rock, transform.position,new Quaternion (0,0,0,0));
22.         }
23.    
24.     }
25. }

shooting:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Rockmove : MonoBehaviour {
5.     public float BulletSpeed = 1;
6.     //public float Bulletleft = -8;
7.  
8.     // Use this for initialization
9.     void Start () {
10.    
11.     }
12.    
13.     // Update is called once per frame
14.     void Update () {
15.         transform.Translate (Vector2.one * BulletSpeed * Time.deltaTime);
16.         if (transform.position.y > 20 || transform.position.y < -20) {
17.             Destroy (gameObject);
18.         }
19.     }
20. }
21.  

 

Code (CSharp):

1.  
2. transform.Translate(Vector2.one*BulletSpeed*Time.deltaTime);
3.  

This is whats causing the problem.
Change BulletSpeed as the player changes direction.

Code (CSharp):

1.  
2. BulletSpeed=PlayerDirection;
3.  

so ,if PlayerDirection is 1 then bulletspeed is 1 ,
if PlayerDirection is -1 then bulletSpeed is -1.

 

or you can add second bullet for left as prefab. Make it speed -1.
public GameObject Rock, RockLeft;
then Instantiate for shooting left, RockLeft.

 

Oh~i got it.
Thanks for your helps^_^