From 36824a459cf539d024a5c0bd07e2e7257b986ffd Mon Sep 17 00:00:00 2001
From: vng <viktor.govako@gmail.com>
Date: Tue, 29 Oct 2013 16:46:47 +0300
Subject: [PATCH] [tracks] Track::GetLengthMeters.

---
 map/track.cpp | 22 ++++++++++++++++++++++
 map/track.hpp |  2 +-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/map/track.cpp b/map/track.cpp
index 0f84f75e1f..f645f06279 100644
--- a/map/track.cpp
+++ b/map/track.cpp
@@ -1,5 +1,7 @@
 #include "track.hpp"
 
+#include "../indexer/mercator.hpp"
+
 #include "../graphics/screen.hpp"
 #include "../graphics/pen.hpp"
 #include "../graphics/depth_constants.hpp"
@@ -7,6 +9,7 @@
 
 #include "../geometry/distance.hpp"
 #include "../geometry/simplification.hpp"
+#include "../geometry/distance_on_sphere.hpp"
 
 #include "../base/timer.hpp"
 #include "../base/logging.hpp"
@@ -80,6 +83,25 @@ void Track::CreateDisplayList(graphics::Screen * dlScreen, MatrixT const & matri
   dlScreen->endFrame();
 }
 
+double Track::GetLengthMeters() const
+{
+  double res = 0.0;
+
+  PolylineD::IterT i = m_polyline.Begin();
+  double lat1 = MercatorBounds::YToLat(i->y);
+  double lon1 = MercatorBounds::XToLon(i->x);
+  for (++i; i != m_polyline.End(); ++i)
+  {
+    double const lat2 = MercatorBounds::YToLat(i->y);
+    double const lon2 = MercatorBounds::XToLon(i->x);
+    res += ms::DistanceOnEarth(lat1, lon1, lat2, lon2);
+    lat1 = lat2;
+    lon1 = lon2;
+  }
+
+  return res;
+}
+
 double Track::GetShortestSquareDistance(m2::PointD const & point) const
 {
   double res = numeric_limits<double>::max();
diff --git a/map/track.hpp b/map/track.hpp
index 85eb587b0e..d9669fcd63 100644
--- a/map/track.hpp
+++ b/map/track.hpp
@@ -68,7 +68,7 @@ public:
   m2::RectD const & GetLimitRect() const { return m_rect; }
   //@}
 
-  double GetLength() const { return m_polyline.GetLength(); }
+  double GetLengthMeters() const;
   double GetShortestSquareDistance(m2::PointD const & point) const;
 
   void Swap(Track & rhs);