Initial commit

GameOfLife/Entities/Projections.cs

@@ -0,0 +1,32 @@
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+
+namespace GameOfLife.Entities
+{
+    public class Projections : ReadOnlyCollection<Pattern>
+    {
+        public Dictionary<Pattern, Pattern> BoundaryCells { get; }
+
+        public Projections(IEnumerable<Pattern> pattern) 
+            : base(pattern.SelectMany(GeneratePatterns).Distinct().ToList())
+        {
+            BoundaryCells = this.ToDictionary(p => p, p => p.GetBoundary);
+        }
+
+        public Projections(Pattern pattern) : this(new[] { pattern }) { }
+
+        private static List<Pattern> GeneratePatterns(Pattern pattern) =>
+            new[]
+            {
+                pattern.Normalize(),
+                pattern.Rotate(1).Normalize(),
+                pattern.Rotate(2).Normalize(),
+                pattern.Rotate(3).Normalize(),
+                pattern.ReflectX().Normalize(),
+                pattern.ReflectY().Normalize(),
+                pattern.ReflectX().Rotate().Normalize(),
+                pattern.ReflectY().Rotate().Normalize()
+            }.Distinct().ToList();
+    }
+}