How do I make a gun have iron sight aim using pixel sprites?

Hey Everyone!

I am new to programming and Unity for that matter and I am playing around with pixel gun sprites that I made.

Anyways, so far I only have non-aim gun animations for shooting and I want to add to my code that I have made to support aiming down the sites when you hold down right-click on your mouse. My code is below as well as the images.

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.UI;
3. using System.Collections;
4.  
5. [RequireComponent(typeof(AudioSource))]
6. public class Pistol : MonoBehaviour
7. {
8.  
9.     public Sprite idlePistol;
10.     public Sprite shotPistol;
11.     public Sprite shotPistol1;
12.     public Sprite shotPistol2;
13.     public Sprite shotPistol3;
14.     public float pistolDamage;
15.     public float pistolRange;
16.     public AudioClip shotSound;
17.     public AudioClip reloadSound;
18.     public AudioClip emptyGunSound;
19.  
20.     public Text ammoText;
21.  
22.     public int ammoAmount;
23.     public int ammoClipSize;
24.  
25.     public GameObject bulletHole;
26.  
27.     int ammoLeft;
28.     int ammoClipLeft;
29.  
30.     bool isShot;
31.     bool isReloading;
32.  
33.     AudioSource source;
34.  
35.     void Awake()
36.     {
37.         source = GetComponent<AudioSource>();
38.         ammoLeft = ammoAmount;
39.         ammoClipLeft = ammoClipSize;
40.     }
41.  
42.     void Update()
43.     {
44.         ammoText.text = ammoClipLeft + " / " + ammoLeft;
45.  
46.         if (Input.GetButtonDown("Fire1") && isReloading == false)
47.             isShot = true;
48.         if (Input.GetKeyDown(KeyCode.R) && isReloading == false)
49.         {
50.             Reload();
51.         }
52.     }
53.  
54.     void FixedUpdate()
55.     {
56.         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
57.         RaycastHit hit;
58.         if (isShot == true && ammoClipLeft > 0 && isReloading == false)
59.         {
60.             isShot = false;
61.             ammoClipLeft--;
62.             source.PlayOneShot(shotSound);
63.             StartCoroutine("shot");
64.             if (Physics.Raycast(ray, out hit, pistolRange))
65.             {
66.                 Debug.Log("Wszedlem w kolizje z " + hit.collider.gameObject.name);
67.                 hit.collider.gameObject.SendMessage("pistolHit", pistolDamage, SendMessageOptions.DontRequireReceiver);
68.                 Instantiate(bulletHole, hit.point, Quaternion.FromToRotation(Vector3.up, hit.normal));
69.             }
70.         }
71.         else if (isShot == true && ammoClipLeft <= 0 && isReloading == false)
72.         {
73.             isShot = false;
74.             Reload();
75.         }
76.     }
77.  
78.     void Reload()
79.     {
80.         int bulletsToReload = ammoClipSize - ammoClipLeft;
81.         if (ammoLeft >= bulletsToReload)
82.         {
83.             StartCoroutine("ReloadWeapon");
84.             ammoLeft -= bulletsToReload;
85.             ammoClipLeft = ammoClipSize;
86.         }
87.         else if (ammoLeft < bulletsToReload && ammoLeft > 0)
88.         {
89.             StartCoroutine("ReloadWeapon");
90.             ammoClipLeft += ammoLeft;
91.             ammoLeft = 0;
92.         }
93.         else if (ammoLeft <= 0)
94.         {
95.             source.PlayOneShot(emptyGunSound);
96.         }
97.     }
98.     IEnumerator ReloadWeapon()
99.     {
100.         isReloading = true;
101.         source.PlayOneShot(reloadSound);
102.         yield return new WaitForSeconds(2);
103.         isReloading = false;
104.     }
105.     IEnumerator shot()
106.     {
107.         GetComponent<SpriteRenderer>().sprite = shotPistol;
108.         yield return new WaitForSeconds(0.1f);
109.         GetComponent<SpriteRenderer>().sprite = shotPistol1;
110.         yield return new WaitForSeconds(0.1f);
111.         GetComponent<SpriteRenderer>().sprite = shotPistol2;
112.         yield return new WaitForSeconds(0.1f);
113.         GetComponent<SpriteRenderer>().sprite = shotPistol3;
114.         yield return new WaitForSeconds(0.1f);
115.         GetComponent<SpriteRenderer>().sprite = idlePistol;
116.     }
117.  
118. }

I used the internet and youtube to help make some of this code

Also, how do you make the shots perfectly line up through the iron sights?

Here is the sprite work for the iron sights...



Thanks!