Create BackgroundScaler.cs

BackgroundScaler.cs

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+// Resharper disable all
+// **************************************************************** //
+//
+//   Copyright (c) RimuruDev. All rights reserved.
+//   Contact me: 
+//          - Gmail:    rimuru.dev@gmail.com
+//          - GitHub:   https://github.com/RimuruDev
+//          - LinkedIn: https://www.linkedin.com/in/rimuru/
+//          - GitHub    Organizations: https://github.com/Rimuru-Dev
+//          - Gists:    https://gist.github.com/RimuruDev/61e9f0111b35d3e67ef18fab611d7595
+// **************************************************************** //
+
+using UnityEngine;
+
+namespace RimuruDev
+{
+    [SelectionBase]
+    [DisallowMultipleComponent]
+    [RequireComponent(typeof(SpriteRenderer))]
+    [HelpURL("https://github.com/RimuruDev/Unity-BackgroundScaler")]
+    public sealed class BackgroundScaler : MonoBehaviour
+    {
+        [SerializeField] private Camera cameraRenderer;
+        private SpriteRenderer backgroundSpriteRenderer;
+
+        private void Awake() =>
+            backgroundSpriteRenderer = GetComponent<SpriteRenderer>();
+
+        private void Start() =>
+            ScaleBackground();
+
+        private void LateUpdate() =>
+            ScaleBackground();
+
+        private void ScaleBackground()
+        {
+            var targetHeight = cameraRenderer.orthographicSize * 2;
+            var targetWidth = targetHeight * Screen.width / Screen.height;
+
+            var backgroundSize = backgroundSpriteRenderer.sprite.bounds.size;
+
+            var targetScale = Vector3.one;
+
+            var widthRatio = targetWidth / backgroundSize.x;
+            var heightRatio = targetHeight / backgroundSize.y;
+
+            if (widthRatio > heightRatio)
+                targetScale *= widthRatio;
+            else
+                targetScale *= heightRatio;
+
+            transform.localScale = targetScale;
+        }
+    }
+}