Add function of computing position range occupied by hit objects

osu.Game.Rulesets.Catch/Edit/PositionRange.cs

@@ -0,0 +1,33 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+
+#nullable enable
+
+namespace osu.Game.Rulesets.Catch.Edit
+{
+    /// <summary>
+    /// Represents a closed interval of horizontal positions in the playfield.
+    /// </summary>
+    public readonly struct PositionRange
+    {
+        public readonly float Min;
+        public readonly float Max;
+
+        public PositionRange(float value)
+            : this(value, value)
+        {
+        }
+
+        public PositionRange(float min, float max)
+        {
+            Min = min;
+            Max = max;
+        }
+
+        public static PositionRange Union(PositionRange a, PositionRange b) => new PositionRange(Math.Min(a.Min, b.Min), Math.Max(a.Max, b.Max));
+
+        public static readonly PositionRange EMPTY = new PositionRange(float.PositiveInfinity, float.NegativeInfinity);
+    }
+}