From 39340e70f86f362d10d2fe21d1cb06080d5870c8 Mon Sep 17 00:00:00 2001
From: Randy Mackay <rmackay9@yahoo.com>
Date: Tue, 15 Sep 2015 15:53:44 +0900
Subject: [PATCH] Math: add Vector2 is_zero method

---
 libraries/AP_Math/vector2.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/AP_Math/vector2.h b/libraries/AP_Math/vector2.h
index 9cdd8ab604..c599ed6496 100644
--- a/libraries/AP_Math/vector2.h
+++ b/libraries/AP_Math/vector2.h
@@ -105,6 +105,9 @@ struct Vector2
     // check if any elements are infinity
     bool is_inf(void) const;
 
+    // check if all elements are zero
+    bool is_zero(void) const { return (fabsf(x) < FLT_EPSILON) && (fabsf(y) < FLT_EPSILON); }
+
     // zero the vector
     void zero()
     {