From e9388a4f4c47d1df503ed538e62c09e010c6aa2d Mon Sep 17 00:00:00 2001
From: Pacien TRAN-GIRARD
Date: Mon, 23 Nov 2015 11:43:34 +0100
Subject: Add zero vector constructor

---
 src/ch/epfl/maze/util/Vector2D.java | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/ch/epfl/maze/util/Vector2D.java')

diff --git a/src/ch/epfl/maze/util/Vector2D.java b/src/ch/epfl/maze/util/Vector2D.java
index 66b0216..407851c 100644
--- a/src/ch/epfl/maze/util/Vector2D.java
+++ b/src/ch/epfl/maze/util/Vector2D.java
@@ -9,6 +9,8 @@ public final class Vector2D {
     /* shift constant to compute the hash */
     private static final int SHIFT = 1000;
 
+    private static final int ZERO = 0;
+
     /* 2-dimension coordinates */
     private final int mX, mY;
 
@@ -24,6 +26,13 @@ public final class Vector2D {
         mY = y;
     }
 
+    /**
+     * Constructs a 2-dimensional zero vector.
+     */
+    public Vector2D() {
+        this(Vector2D.ZERO, Vector2D.ZERO);
+    }
+
     /**
      * Adds two coordinates to the vector.
      *
-- 
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