rectTransform Extensions #84

Runtime/Utilities/RectTransformExtensions.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Linq;
+using UnityEngine;
+
+namespace StansAssets.Foundation
+{
+    /// <summary>
+    /// Rect Transform Utility methods.
+    /// </summary>
+    public static class RectTransformExtensions
+    //
+    {
+        /// <summary>
+        /// Method to get Rect related to ScreenSpace, from given RectTransform.
+        /// This will give the real position of this Rect on screen.
+        /// </summary>
+        /// <param name="transform">Original RectTransform of some object</param>
+        /// <returns>New Rect instance.</returns>
+        public static Rect RectTransformToScreenSpace(RectTransform transform) 
+        {
+            Vector2 size = Vector2.Scale(transform.rect.size, transform.lossyScale);
+            Rect rect = new Rect(transform.position.x, Screen.height - transform.position.y, size.x, size.y);
+            rect.x -= (transform.pivot.x * size.x);
+            rect.y -= ((1.0f - transform.pivot.y) * size.y);
+            return rect;
+        }
+        public static void SetLeft(this RectTransform rt, float left)
+        {
+            rt.offsetMin = new Vector2(left, rt.offsetMin.y);
+        }
+
+        public static void SetRight(this RectTransform rt, float right)
+        {
+            rt.offsetMax = new Vector2(-right, rt.offsetMax.y);
+        }
+
+        public static void SetTop(this RectTransform rt, float top)
+        {
+            rt.offsetMax = new Vector2(rt.offsetMax.x, -top);
+        }
+
+        public static void SetBottom(this RectTransform rt, float bottom)
+        {
+            rt.offsetMin = new Vector2(rt.offsetMin.x, bottom);
+        }
+    }
+}