From eb49b5776a2c94ef82e1c33866753a6f6a0bc742 Mon Sep 17 00:00:00 2001
From: Artem Pavlenko <artem@mapnik.org>
Date: Tue, 9 Mar 2021 15:02:11 +0000
Subject: [PATCH] Fix BBOX in geographic WGS84 (epsg:4326) calc logic

---
 demo/viewer/mapwidget.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/demo/viewer/mapwidget.cpp b/demo/viewer/mapwidget.cpp
index de4523059..a9eb166f5 100644
--- a/demo/viewer/mapwidget.cpp
+++ b/demo/viewer/mapwidget.cpp
@@ -23,7 +23,7 @@
 #include <boost/bind.hpp>
 #include <mapnik/agg_renderer.hpp>
 #include <mapnik/layer.hpp>
-#include <mapnik/projection.hpp>
+#include <mapnik/proj_transform.hpp>
 #include <mapnik/scale_denominator.hpp>
 #include <mapnik/view_transform.hpp>
 #include <mapnik/transform_path_adapter.hpp>
@@ -592,8 +592,12 @@ void MapWidget::updateMap()
           double y0 = ext.miny();
           double x1 = ext.maxx();
           double y1 = ext.maxy();
-          prj.inverse(x0,y0);
-          prj.inverse(x1,y1);
+          double z = 0;
+          std::string dest_srs = {"epsg:4326"};
+          mapnik::proj_transform proj_tr(map_->srs(), dest_srs);
+
+          proj_tr.forward(x0, y0, z);
+          proj_tr.forward(x1, y1, z);
           std::cout << "BBOX (WGS84): " << x0 << "," << y0 << "," << x1 << "," << y1 << "\n";
           update();
           // emit signal to interested widgets