Initial commit

Assets/Resources/Scripts/ScaleToFitScreen.cs

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+using UnityEngine;
+
+public class ScaleToFitScreen : MonoBehaviour
+{
+    private SpriteRenderer sr;
+
+    private void Start()
+    {
+        sr = GetComponent<SpriteRenderer>();
+
+        // world height is always camera's orthographicSize * 2
+        float worldScreenHeight = Camera.main.orthographicSize * 2;
+
+        // world width is calculated by diving world height with screen heigh
+        // then multiplying it with screen width
+        float worldScreenWidth = worldScreenHeight / Screen.height * Screen.width;
+
+        // to scale the game object we divide the world screen width with the
+        // size x of the sprite, and we divide the world screen height with the
+        // size y of the sprite
+        transform.localScale = new Vector3(
+            worldScreenWidth / sr.sprite.bounds.size.x,
+            worldScreenHeight / sr.sprite.bounds.size.y, 1);
+    }
+
+} // class