From 866f5f98eb66316ea5de0aa471db18cadb056c86 Mon Sep 17 00:00:00 2001
From: Artem Pavlenko <artem@mapnik.org>
Date: Mon, 2 Feb 2009 23:07:18 +0000
Subject: [PATCH] + implement buffered_extent method on Map object

---
 include/mapnik/map.hpp | 5 +++++
 src/map.cpp            | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/mapnik/map.hpp b/include/mapnik/map.hpp
index 355226f1b..089b88a6a 100644
--- a/include/mapnik/map.hpp
+++ b/include/mapnik/map.hpp
@@ -298,6 +298,11 @@ namespace mapnik
          */
         const Envelope<double>& getCurrentExtent() const;
 
+        /*! \brief Get current buffered bounding box.
+         *  @return The current buffered bounding box.
+         */
+        Envelope<double> get_buffered_extent() const;
+        
         double scale() const;
         
         double scale_denominator() const;
diff --git a/src/map.cpp b/src/map.cpp
index 9034990d5..88bb19923 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -372,6 +372,15 @@ namespace mapnik
         return currentExtent_;
     }
 
+   Envelope<double> Map::get_buffered_extent() const
+   {
+      double extra = 2.0 * scale() * buffer_size_;
+      Envelope<double> ext(currentExtent_);
+      ext.width(currentExtent_.width() + extra);
+      ext.height(currentExtent_.height() + extra);
+      return ext;
+   }
+   
     void Map::pan(int x,int y)
     {
         int dx = x - int(0.5 * width_);