From 5fd5f13b9387ad01195b49b3309de4ab7197ac49 Mon Sep 17 00:00:00 2001
From: Matteo Cypriani <matteo.cypriani@univ-fcomte.fr>
Date: Fri, 24 Aug 2012 16:25:26 +0200
Subject: [PATCH] [Positioner] Add Point3D::distance_2d()

---
 owlps-positioner/src/point3d.hh | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/owlps-positioner/src/point3d.hh b/owlps-positioner/src/point3d.hh
index 04e2b6c..7a3cb40 100644
--- a/owlps-positioner/src/point3d.hh
+++ b/owlps-positioner/src/point3d.hh
@@ -57,6 +57,8 @@ public:
   float square_distance_2d(const Point3D &p) const ;
   /// Square euclidean distance to a Point3D
   float square_distance(const Point3D &p) const ;
+  /// Euclidean distance to a Point3D, in 2D
+  float distance_2d(const Point3D &p) const ;
   /// Euclidean distance to a Point3D
   float distance(const Point3D &p) const ;
   /// Euclidean distance to the radius of a sphere
@@ -166,6 +168,16 @@ inline void Point3D::set_coordinates(const Point3D &source)
 /* *** Distance operations *** */
 
 
+/**
+ * Note: to compare distances, use preferably square_distance_2d(),
+ * which is more efficient.
+ */
+inline float Point3D::distance_2d(const Point3D &source) const
+{
+  return sqrt(square_distance_2d(source)) ;
+}
+
+
 /**
  * Note: to compare distances, use preferably square_distance(),
  * which is more efficient.