add liberties

1 files changed, 15 insertions, 4 deletions

diff --git a/src/engine/vector2.js b/src/engine/vector2.js
index 6c2a2a2..8b10e28 100644
--- a/src/engine/vector2.js
+++ b/src/engine/vector2.js
@@ -5,9 +5,20 @@ export class Vector2 {
     }
 
     static sum(a, b) {
-	return new Vector2(
-	    a.x + b.x,
-	    a.y + b.y,
-	)
+        return new Vector2(
+            a.x + b.x,
+            a.y + b.y,
+        )
+    }
+
+    static equals(a, b) {
+        if (
+            a.x == b.x &&
+            a.y == b.y
+        ) {
+            return true
+        }
+
+        return false
     }
 }