fixed Vector2Int Distance issue

LinearAlgebra/Vector2.cs

@@ -1,6 +1,9 @@
+using System;
+using System.Numerics;
+
 namespace Passer.LinearAlgebra {
 
-    public class Vector2Of<T> {
+    public class Vector2Of<T> where T : IComparable<T> {
         public T x;
         public T y;
 
@@ -12,8 +15,37 @@ namespace Passer.LinearAlgebra {
 
     public class Vector2Int : Vector2Of<int> {
         public Vector2Int(int x, int y) : base(x, y) { }
+
+        public static Vector2Int operator -(Vector2Int v1, Vector2Int v2) {
+            return new Vector2Int(v1.x - v2.x, v1.y - v2.y);
+        }
+
+        public float magnitude {
+            get {
+                return (float)Math.Sqrt(this.x * this.x + this.y * this.y);
+            }
+        }
+
+        public static float Distance(Vector2Int v1, Vector2Int v2) {
+            return (v1 - v2).magnitude;
+        }
     }
+
     public class Vector2Float : Vector2Of<float> {
         public Vector2Float(float x, float y) : base(x, y) { }
+
+        public static Vector2Float operator -(Vector2Float v1, Vector2Float v2) {
+            return new Vector2Float(v1.x - v2.x, v1.y - v2.y);
+        }
+
+        public float magnitude {
+            get {
+                return (float)Math.Sqrt(this.x * this.x + this.y * this.y);
+            }
+        }
+
+        public static float Distance(Vector2Float v1, Vector2Float v2) {
+            return (v1 - v2).magnitude;
+        }
     }
 }