Add extension methods for UI graphics

Author: adamgraham

Runtime/Extensions.meta

@@ -0,0 +1,36 @@
+using UnityEngine.UI;
+
+namespace Zigurous.UI
+{
+    /// <summary>
+    /// Extension methods for UI graphics.
+    /// </summary>
+    public static class GraphicExtensions
+    {
+        /// <summary>
+        /// Fades the alpha of the graphic to 100% over the given
+        /// <paramref name="duration"/>.
+        /// </summary>
+        /// <param name="graphic">The graphic to fade.</param>
+        /// <param name="duration">The amount of seconds it takes to fade the graphic.</param>
+        /// <param name="ignoreTimeScale">Ignores the time scale when fading the graphic.</param>
+        public static void FadeIn(this Graphic graphic, float duration, bool ignoreTimeScale = false)
+        {
+            graphic.CrossFadeAlpha(1.0f, duration, ignoreTimeScale);
+        }
+
+        /// <summary>
+        /// Fades the alpha of the graphic to 0% over the given
+        /// <paramref name="duration"/>.
+        /// </summary>
+        /// <param name="graphic">The graphic to fade.</param>
+        /// <param name="duration">The amount of seconds it takes to fade the graphic.</param>
+        /// <param name="ignoreTimeScale">Ignores the time scale when fading the graphic.</param>
+        public static void FadeOut(this Graphic graphic, float duration, bool ignoreTimeScale = false)
+        {
+            graphic.CrossFadeAlpha(0.0f, duration, ignoreTimeScale);
+        }
+
+    }
+
+}