Add BananaShower models and representations

(cherry picked from commit e12e095)

osu.Game.Rulesets.Catch/Objects/BananaShower.cs

@@ -0,0 +1,61 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.MathUtils;
+using osu.Game.Rulesets.Objects.Types;
+using OpenTK.Graphics;
+
+namespace osu.Game.Rulesets.Catch.Objects
+{
+    public class BananaShower : CatchHitObject, IHasEndTime
+    {
+        public override FruitVisualRepresentation VisualRepresentation => FruitVisualRepresentation.Banana;
+
+        protected override void CreateNestedHitObjects()
+        {
+            base.CreateNestedHitObjects();
+            createBananas();
+        }
+
+        private void createBananas()
+        {
+            double spacing = Duration;
+            while (spacing > 100)
+                spacing /= 2;
+
+            if (spacing <= 0)
+                return;
+
+            for (double i = StartTime; i <= EndTime; i += spacing)
+                AddNested(new Banana
+                {
+                    Samples = Samples,
+                    ComboColour = getNextComboColour(),
+                    StartTime = i,
+                    X = RNG.NextSingle()
+                });
+        }
+
+        private Color4 getNextComboColour()
+        {
+            switch (RNG.Next(0, 3))
+            {
+                default:
+                    return new Color4(255, 240, 0, 255);
+                case 1:
+                    return new Color4(255, 192, 0, 255);
+                case 2:
+                    return new Color4(214, 221, 28, 255);
+            }
+        }
+
+        public double EndTime => StartTime + Duration;
+
+        public double Duration { get; set; }
+
+        public class Banana : Fruit
+        {
+            public override FruitVisualRepresentation VisualRepresentation => FruitVisualRepresentation.Banana;
+        }
+    }
+}