Add color extension utility functions

Author: adamgraham

Runtime/ColorExtensions.cs

@@ -0,0 +1,56 @@
+using UnityEngine;
+
+namespace Zigurous.Tweening
+{
+    /// <summary>
+    /// Utility extension methods for colors.
+    /// </summary>
+    internal static class ColorExtensions
+    {
+        /// <summary>
+        /// Returns a copy of the color with the red component changed.
+        /// </summary>
+        /// <param name="color">The color to change.</param>
+        /// <param name="red">The new red component.</param>
+        /// <returns>A copy of the color with the red component changed.</returns>
+        public static Color WithRed(this Color color, float red)
+        {
+            return new Color(red, color.g, color.b, color.a);
+        }
+
+        /// <summary>
+        /// Returns a copy of the color with the green component changed.
+        /// </summary>
+        /// <param name="color">The color to change.</param>
+        /// <param name="green">The new green component.</param>
+        /// <returns>A copy of the color with the green component changed.</returns>
+        public static Color WithGreen(this Color color, float green)
+        {
+            return new Color(color.r, green, color.b, color.a);
+        }
+
+        /// <summary>
+        /// Returns a copy of the color with the blue component changed.
+        /// </summary>
+        /// <param name="color">The color to change.</param>
+        /// <param name="blue">The new blue component.</param>
+        /// <returns>A copy of the color with the blue component changed.</returns>
+        public static Color WithBlue(this Color color, float blue)
+        {
+            return new Color(color.r, color.g, blue, color.a);
+        }
+
+        /// <summary>
+        /// Returns a copy of the color with the alpha component changed.
+        /// </summary>
+        /// <param name="color">The color to change.</param>
+        /// <param name="alpha">The new alpha component.</param>
+        /// <returns>A copy of the color with the alpha component changed.</returns>
+        public static Color WithAlpha(this Color color, float alpha)
+        {
+            return new Color(color.r, color.g, color.b, alpha);
+        }
+
+    }
+
+}