Add clone to gradients.

Dashboard.Common/Gradient.cs

@@ -30,7 +30,7 @@ namespace Dashboard
     /// <summary>
     /// Represents a linear gradient.
     /// </summary>
-    public struct Gradient : ICollection<GradientStop>
+    public struct Gradient : ICollection<GradientStop>, ICloneable
     {
         private readonly List<GradientStop> _stops = new List<GradientStop>();
 
@@ -79,6 +79,16 @@ namespace Dashboard
             Add(new GradientStop(1, b));
         }
 
+        public Gradient(IEnumerable<GradientStop> stops)
+        {
+            _stops.AddRange(stops);
+
+            if (_stops.Any(x => x.Position < 0 || x.Position > 1))
+                throw new Exception("Gradient stop positions must be in the range [0, 1].");
+
+            _stops.Sort((a, b) => a.Position.CompareTo(b.Position));
+        }
+
         public Color GetColor(float position)
         {
             if (Count == 0)
@@ -112,6 +122,28 @@ namespace Dashboard
             return Color.FromArgb((byte)color.W, (byte)color.X, (byte)color.Y, (byte)color.Z);
         }
 
+        public Gradient Clone()
+        {
+            Gradient gradient = new Gradient()
+            {
+                Type = Type,
+                C0 = C0,
+                C1 = C1,
+            };
+
+            foreach (GradientStop stop in _stops)
+            {
+                gradient.Add(stop);
+            }
+
+            return gradient;
+        }
+
+        object ICloneable.Clone()
+        {
+            return Clone();
+        }
+
         public IEnumerator<GradientStop> GetEnumerator()
         {
             return _stops.GetEnumerator();
@@ -124,6 +156,9 @@ namespace Dashboard
 
         public void Add(GradientStop item)
         {
+            if (item.Position < 0 || item.Position > 1)
+                throw new Exception("Gradient stop positions must be in the range [0, 1].");
+
             int index = _stops.FindIndex(x => x.Position > item.Position);
             if (index == -1)
                 index = _stops.Count;