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Assets/Free 2D Cartoon Parallax Background/Demo/Script/BackgroundControl_0.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class BackgroundControl_0 : MonoBehaviour
+{
+    [Header("BackgroundNum 0 -> 3")]
+    public int backgroundNum;
+    public Sprite[] Layer_Sprites;
+    private GameObject[] Layer_Object = new GameObject[5];
+    private int max_backgroundNum = 3;
+
+    public bool enableSwitching = false;
+    void Start()
+    {
+        for (int i = 0; i < Layer_Object.Length; i++){
+            Layer_Object[i] = GameObject.Find("Layer_" + i);
+        }
+        
+        ChangeSprite();
+    }
+
+    void Update() {
+        if(!enableSwitching){return;}
+        //for presentation without UIs
+        if (Input.GetKeyDown(KeyCode.RightArrow)) NextBG();
+        if (Input.GetKeyDown(KeyCode.LeftArrow)) BackBG();
+    }
+
+    void ChangeSprite(){
+        Layer_Object[0].GetComponent<SpriteRenderer>().sprite = Layer_Sprites[backgroundNum*5];
+        for (int i = 1; i < Layer_Object.Length; i++){
+            Sprite changeSprite = Layer_Sprites[backgroundNum*5 + i];
+            //Change Layer_1->7
+            Layer_Object[i].GetComponent<SpriteRenderer>().sprite = changeSprite;
+            //Change "Layer_(*)x" sprites in children of Layer_1->7
+            Layer_Object[i].transform.GetChild(0).GetComponent<SpriteRenderer>().sprite = changeSprite;
+            Layer_Object[i].transform.GetChild(1).GetComponent<SpriteRenderer>().sprite = changeSprite;
+        }
+    }
+
+    public void NextBG(){
+        backgroundNum = backgroundNum + 1;
+        if (backgroundNum > max_backgroundNum) backgroundNum = 0;
+        ChangeSprite();
+    }
+    public void BackBG(){
+        backgroundNum = backgroundNum - 1;
+        if (backgroundNum < 0) backgroundNum = max_backgroundNum;
+        ChangeSprite();
+    }
+}

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Assets/Free 2D Cartoon Parallax Background/Demo/Script/ParallaxBackground_0.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class ParallaxBackground_0 : MonoBehaviour
+{
+    public bool Camera_Move;
+    public float Camera_MoveSpeed = 1.5f;
+    [Header("Layer Setting")]
+    public float[] Layer_Speed = new float[7];
+    public GameObject[] Layer_Objects = new GameObject[7];
+
+    private Transform _camera;
+    private float[] startPos = new float[7];
+    private float boundSizeX;
+    private float sizeX;
+    private GameObject Layer_0;
+    void Start()
+    {
+        _camera = Camera.main.transform;
+        sizeX = Layer_Objects[0].transform.localScale.x;
+        boundSizeX = Layer_Objects[0].GetComponent<SpriteRenderer>().sprite.bounds.size.x;
+        for (int i=0;i<5;i++){
+            startPos[i] = _camera.position.x;
+        }
+    }
+
+    void Update(){
+        //Moving camera
+        if (Camera_Move){
+        _camera.position += Vector3.right * Time.deltaTime * Camera_MoveSpeed;
+        }
+        for (int i=0;i<5;i++){
+            float temp = (_camera.position.x * (1-Layer_Speed[i]) );
+            float distance = _camera.position.x  * Layer_Speed[i];
+            Layer_Objects[i].transform.position = new Vector2 (startPos[i] + distance, _camera.position.y);
+            if (temp > startPos[i] + boundSizeX*sizeX){
+                startPos[i] += boundSizeX*sizeX;
+            }else if(temp < startPos[i] - boundSizeX*sizeX){
+                startPos[i] -= boundSizeX*sizeX;
+            }
+            
+        }
+    }
+}

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