分散文件结构，添加了枚举类型的一个辅助类

Runtime/MicroLibrary/Vector2Extend.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+
+using UnityEngine;
+
+namespace XericLibrary.Runtime.MacroLibrary
+{
+    public static class Vector2Extend 
+    {
+		/// <summary>
+		/// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>涨<EFBFBD>ı༭<C4B1><E0BCAD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+		/// </summary>
+		/// <param name="vec"></param>
+		/// <returns></returns>
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static Vector3 ToVector3(this Vector2 vec)
+			=> new Vector3(vec.x, 0, vec.y);
+
+		[Obsolete("unfinished")]
+		public static Vector2 Projection(this Vector2 point, Vector3 start, Vector3 end)
+		{
+			Vector3 vec = end - start;
+			float xx = Mathf.Pow(vec.x, 2f);
+			float yy = Mathf.Pow(vec.y, 2f);
+			float denominator = xx + yy;
+			if(denominator == 0)
+				return point;
+
+			float xy = vec.x * vec.y;
+			//float moleculey = yy * 
+			return new Vector2(xx, xy);
+		}
+
+		public static Vector2 Projection(this Vector2 point, Vector2 start, Vector2 end)
+		{
+			Vector2 ab = end - start;
+			Vector2 ap = point - start;
+			return start + ab * Vector2.Dot(ap, ab) / ab.sqrMagnitude;
+		}
+
+		/// <summary>
+		/// ʸ<><CAB8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+		/// </summary>
+		/// <param name="vec"></param>
+		/// <returns></returns>
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static Vector2 Orthogonalization(this Vector2 vec)
+			=> new Vector2(
+			(float)Math.Round(vec.x),
+			(float)Math.Round(vec.y)
+			);
+
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static Vector2 Min(this Vector2 a, Vector2 b)
+		{
+			return new Vector2(Math.Min(a.x, b.x), Math.Min(a.y, b.y));
+		}
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static Vector2 Max(this Vector2 a, Vector2 b)
+		{
+			return new Vector2(Math.Max(a.x, b.x), Math.Max(a.y, b.y));
+		}
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static float MinElement(this Vector2 a)
+		{
+			return Math.Min(a.x, a.y);
+		}
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static float MaxElement(this Vector2 a)
+		{
+			return Math.Max(a.x, a.y);
+		}
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static Vector2 Abs(this Vector2 a)
+		{
+			return new Vector2(Math.Abs(a.x), Math.Abs(a.y));
+		}
+		/// <summary>
+		/// <20><>ȡʸ<C8A1><CAB8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+		/// </summary>
+		/// <param name="vec"></param>
+		/// <returns></returns>
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static Vector2 Sign(this Vector2 vec)
+			=> new Vector2(
+			Math.Sign(vec.x),
+			Math.Sign(vec.y)
+			);
+
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static float Cross(this Vector2 lhs, Vector2 rhs)
+			=> lhs.x * rhs.y - rhs.x * lhs.y;
+
+		/// <summary>
+		/// <20><>б<EFBFBD>߶<EFBFBD><DFB6><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>
+		/// </summary>
+		/// <param name="point"></param>
+		/// <param name=""></param>
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		public static Vector2 ObliqueAlign(this Vector2 point, Vector2 constPoint, out float exec)
+		{
+			float b1 = point.y - point.x, b2 = constPoint.y - constPoint.x;
+			float dt = b1 + (b2 - b1);
+			exec = dt * MacroMath.Sqrt22;
+			Vector2 ab = constPoint - point;
+			bool cool = ab.x * ab.y < 0;
+			return exec * (cool ? Vector2.one : new Vector2(-1, 1));
+		}
+
+	}
+}