Updated reprojection code

Makefile

@@ -74,6 +74,9 @@ test-python:
 test-cpp:
 	./tests/cpp_tests/run
 
+test-cxx:
+	./tests/cxx/run
+
 check: test-local
 
 bench:

include/mapnik/geometry_reprojection.hpp

@@ -27,16 +27,36 @@
 #include <mapnik/proj_transform.hpp>
 #include <mapnik/geometry.hpp>
 
-// std
-#include <string>
 
 namespace mapnik {
 
-MAPNIK_DECL geometry::geometry reproject(geometry::geometry const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse = false);
+namespace geometry {
 
-MAPNIK_DECL geometry::geometry reproject(geometry::geometry const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+// There is a difference between reprojecting a const vs reprojecting a non const in behavior. If you reproject a
+// const a new geometry (or perhaps empty geometry) will be returned no matter how many geometries fail to reproject.
+// This is done this way so that large geometry collections that only have a few failing points or polygon parts could
+// still be return with out the few failing projections.
 
-MAPNIK_DECL geometry::geometry reproject(geometry::geometry const& geom, std::string const& source, std::string const& dest, unsigned int & n_err);
+MAPNIK_DECL geometry reproject_copy(geometry const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse = false);
+
+template <typename T>
+MAPNIK_DECL T reproject_copy(T const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse = false);
+
+template <typename T>
+MAPNIK_DECL T reproject_copy(T const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+
+
+// No error count is required for a non const reprojection and this will reproject in place.
+// because the reprojection is done on the same memory it is important to check if it succeeded,
+// otherwise you could be dealing with a corrupt geometry.
+
+template <typename T>
+MAPNIK_DECL bool reproject(T & geom, proj_transform const& proj_trans, bool reverse = false);
+
+template <typename T>
+MAPNIK_DECL bool reproject(T & geom, projection const& source, projection const& dest);
+
+} // end geometry ns
 
 } // end mapnik ns
 

include/mapnik/util/variant.hpp

@@ -274,6 +274,12 @@ struct unwrapper<recursive_wrapper<T>>
     {
         return obj.get();
     }
+    
+    auto operator() (recursive_wrapper<T> & obj) const
+        -> typename recursive_wrapper<T>::type &
+    {
+        return obj.get();
+    }
 };
 
 template <typename T>

src/geometry_reprojection.cpp

@@ -22,223 +22,283 @@
 
 // mapnik
 #include <mapnik/geometry_reprojection.hpp>
+#include <mapnik/geometry.hpp>
 
 namespace mapnik {
 
+namespace geometry {
+
 namespace detail {
-
-struct geom_reproj_visitor {
-
-    geom_reproj_visitor(proj_transform const & proj_trans, unsigned int & n_err, bool reverse)
-        : proj_trans_(proj_trans), n_err_(n_err), reverse_(reverse) {}
-
-    geometry::geometry operator() (geometry::geometry_empty const&) 
-    {
-        return geometry::geometry(geometry::geometry_empty());
-    }
     
-    bool trans_point(geometry::point & new_p)
+geometry_empty reproject_internal(geometry_empty const&, proj_transform const&, unsigned int &, bool)
+{
+    return geometry_empty();
+}
+
+point reproject_internal(point const & p, proj_transform const& proj_trans, unsigned int & n_err, bool reverse)
+{
+    point new_p(p);
+    if (!reverse)
     {
-        if (!reverse_)
+        if (!proj_trans.forward(new_p))
         {
-            if (!proj_trans_.forward(new_p))
+            n_err++;
-            {
+        }
-                n_err_++;
+    }
-                return false;
+    else
-            }
+    {
+        if (!proj_trans.backward(new_p))
+        {
+            n_err++;
+        }
+    }
+    return std::move(new_p);
+}
+
+line_string reproject_internal(line_string const & ls, proj_transform const& proj_trans, unsigned int & n_err, bool reverse)
+{
+    line_string new_ls(ls);
+    unsigned int err = 0;
+    if (!reverse)
+    {
+        err = proj_trans.forward(new_ls);
+    }
+    else
+    {
+        err = proj_trans.backward(new_ls);
+    }
+    if (err > 0)
+    {
+        n_err += err;
+    }
+    return std::move(new_ls);
+}
+    
+polygon reproject_internal(polygon const & poly, proj_transform const& proj_trans, unsigned int & n_err, bool reverse)
+{
+    polygon new_poly;
+    linear_ring new_ext(poly.exterior_ring);
+    int err = 0;
+    if (!reverse)
+    {
+        err = proj_trans.forward(new_ext);
+    }
+    else
+    {
+        err = proj_trans.backward(new_ext);
+    }
+    // If the exterior ring doesn't transform don't bother with the holes.
+    if (err > 0)
+    {
+        n_err += err;
+        return std::move(new_poly);
+    }
+    new_poly.set_exterior_ring(std::move(new_ext));
+    new_poly.interior_rings.reserve(poly.interior_rings.size());
+
+    for (auto const& lr : poly.interior_rings)
+    {
+        linear_ring new_lr(lr);
+        if (!reverse)
+        {
+            err = proj_trans.forward(new_lr);
         }
         else
         {
-            if (!proj_trans_.backward(new_p))
+            err = proj_trans.backward(new_lr);
-            {
-                n_err_++;
-                return false;
-            }
-        }
-        return true;
-    }
-    
-    geometry::geometry operator() (geometry::point const & p)
-    {
-        geometry::point new_p(p);
-        if (!trans_point(new_p))
-        {
-            return geometry::geometry(geometry::geometry_empty());
-        }
-        return geometry::geometry(std::move(new_p));
-    }
-
-    bool trans_ls(geometry::line_string & new_ls)
-    {
-        unsigned int err = 0;
-        if (!reverse_)
-        {
-            err = proj_trans_.forward(new_ls);
-        }
-        else
-        {
-            err = proj_trans_.backward(new_ls);
         }
         if (err > 0)
         {
-            n_err_ += err;
+            n_err += err;
-            return false;
+            // If there is an error in interior ring drop
+            // it from polygon.
+            continue;
         }
-        return true;
+        new_poly.add_hole(std::move(new_lr));
     }
+    return std::move(new_poly);
+}
     
-    geometry::geometry operator() (geometry::line_string const & ls)
+multi_point reproject_internal(multi_point const & mp, proj_transform const& proj_trans, unsigned int & n_err, bool reverse)
+{
+    if (proj_trans.is_known())
     {
-        geometry::line_string new_ls(ls);
+        // If the projection is known we do them all at once because it is faster
-        if (!trans_ls(new_ls))
+        // since we know that no point will fail reprojection
+        multi_point new_mp(mp);
+        if (!reverse)
         {
-            return geometry::geometry(geometry::geometry_empty());
+            proj_trans.forward(new_mp);
-        }
-        return geometry::geometry(std::move(new_ls));
-    }
-
-    bool trans_poly(geometry::polygon & new_poly, geometry::polygon const & poly)
-    {
-        geometry::linear_ring new_ext(poly.exterior_ring);
-        int err = 0;
-        if (!reverse_)
-        {
-            err = proj_trans_.forward(new_ext);
         }
         else
         {
-            err = proj_trans_.backward(new_ext);
+            proj_trans.backward(new_mp);
         }
-        // If the exterior ring doesn't transform don't bother with the holes.
+        return std::move(new_mp);
-        if (err > 0)
+    }
+    multi_point new_mp;
+    new_mp.reserve(mp.size());
+    for (auto const& p : mp)
+    {
+        point new_p(p);
+        if (!reverse)
         {
-            n_err_ += err;
+            if (!proj_trans.forward(new_p))
-            return false;
-        }
-        new_poly.set_exterior_ring(std::move(new_ext));
-        new_poly.interior_rings.reserve(poly.interior_rings.size());
-
-        for (auto const& lr : poly.interior_rings)
-        {
-            geometry::linear_ring new_lr(lr);
-            if (!reverse_)
             {
-                err = proj_trans_.forward(new_lr);
+                n_err++;
             }
             else
             {
-                err = proj_trans_.backward(new_lr);
+                new_mp.emplace_back(std::move(new_p));
             }
-            if (err > 0)
-            {
-                n_err_ += err;
-                // If there is an error in interior ring drop
-                // it from polygon.
-                continue;
-            }
-            new_poly.add_hole(std::move(new_lr));
         }
-        return true;
+        else
+        {
+            if (!proj_trans.backward(new_p))
+            {
+                n_err++;
+            }
+            else
+            {
+                new_mp.emplace_back(std::move(new_p));
+            }
+        }
+    }
+    return std::move(new_mp);
+}
+
+multi_line_string reproject_internal(multi_line_string const & mls, proj_transform const& proj_trans, unsigned int & n_err, bool reverse)
+{
+    multi_line_string new_mls;
+    new_mls.reserve(mls.size());
+    for (auto const& ls : mls)
+    {
+        line_string new_ls = reproject_internal(ls, proj_trans, n_err, reverse);
+        if (!new_ls.empty())
+        {
+            new_mls.emplace_back(std::move(new_ls));
+        }
+    }
+    return std::move(new_mls);
+}
+    
+multi_polygon reproject_internal(multi_polygon const & mpoly, proj_transform const& proj_trans, unsigned int & n_err, bool reverse)
+{
+    multi_polygon new_mpoly;
+    new_mpoly.reserve(mpoly.size());
+    for (auto const& poly : mpoly)
+    {
+        polygon new_poly = reproject_internal(poly, proj_trans, n_err, reverse);
+        if (!new_poly.exterior_ring.empty())
+        {
+            new_mpoly.emplace_back(std::move(new_poly));
+        }
+    }
+    return std::move(new_mpoly);
+}
+    
+geometry_collection reproject_internal(geometry_collection const & c, proj_transform const& proj_trans, unsigned int & n_err, bool reverse)
+{
+    geometry_collection new_c;
+    new_c.reserve(c.size());
+    for (auto const& g : c)
+    {
+        geometry new_g(std::move(reproject_copy(g, proj_trans, n_err, reverse)));
+        if (!new_g.is<geometry_empty>())
+        {
+            new_c.emplace_back(std::move(new_g));
+        }
+    }
+    return std::move(new_c);
+}
+
+struct geom_reproj_copy_visitor {
+
+    geom_reproj_copy_visitor(proj_transform const & proj_trans, 
+                             unsigned int & n_err,
+                             bool reverse)
+        : proj_trans_(proj_trans), 
+          n_err_(n_err),
+          reverse_(reverse) {}
+
+    geometry operator() (geometry_empty const&)
+    {
+        return std::move(geometry_empty());
     }
     
-    geometry::geometry operator() (geometry::polygon const & poly)
+    geometry operator() (point const& p)
     {
-        geometry::polygon new_poly;
+        int intial_err = n_err_;
-        if (!trans_poly(new_poly, poly))
+        point new_p = reproject_internal(p, proj_trans_, n_err_, reverse_);
+        if (n_err_ > intial_err)
         {
-            return std::move(geometry::geometry_empty());
+            return std::move(geometry_empty());
+        }
+        return std::move(new_p);
+    }
+
+    geometry operator() (line_string const& ls)
+    {
+        int intial_err = n_err_;
+        line_string new_ls = reproject_internal(ls, proj_trans_, n_err_, reverse_);
+        if (n_err_ > intial_err)
+        {
+            return std::move(geometry_empty());
+        }
+        return std::move(new_ls);
+    }
+    
+    geometry operator() (polygon const& poly)
+    {
+        polygon new_poly = reproject_internal(poly, proj_trans_, n_err_, reverse_);
+        if (new_poly.exterior_ring.empty())
+        {
+            return std::move(geometry_empty());
         }
         return std::move(new_poly);
     }
     
-    geometry::geometry operator() (geometry::multi_point const & mp)
+    geometry operator() (multi_point const& mp)
     {
-        if (proj_trans_.is_known())
+        multi_point new_mp = reproject_internal(mp, proj_trans_, n_err_, reverse_);
-        {
-            geometry::multi_point new_mp(mp);
-            if (!trans_ls(new_mp))
-            {
-                // should be impossible to reach this currently
-                /* LCOV_EXCL_START */
-                return std::move(geometry::geometry_empty());
-                /* LCOV_EXCL_END */
-            }
-            return std::move(new_mp);
-        }
-        geometry::multi_point new_mp;
-        new_mp.reserve(mp.size());
-        for (auto const& p : mp)
-        {
-            geometry::point new_p(p);
-            if (trans_point(new_p))
-            {
-                new_mp.emplace_back(new_p);
-            }
-        }
         if (new_mp.empty())
         {
-            return std::move(geometry::geometry_empty());
+            return std::move(geometry_empty());
         }
         return std::move(new_mp);
     }
     
-    geometry::geometry operator() (geometry::multi_line_string const & mls)
+    geometry operator() (multi_line_string const& mls)
     {
-        geometry::multi_line_string new_mls;
+        multi_line_string new_mls = reproject_internal(mls, proj_trans_, n_err_, reverse_);
-        new_mls.reserve(mls.size());
-        for (auto const& ls : mls)
-        {
-            geometry::line_string new_ls(ls);
-            if (trans_ls(new_ls))
-            {
-                new_mls.emplace_back(new_ls);
-            }
-        }
         if (new_mls.empty())
         {
-            return std::move(geometry::geometry_empty());
+            return std::move(geometry_empty());
         }
         return std::move(new_mls);
     }
     
-    geometry::geometry operator() (geometry::multi_polygon const & mpoly)
+    geometry operator() (multi_polygon const& mpoly)
     {
-        geometry::multi_polygon new_mpoly;
+        multi_polygon new_mpoly = reproject_internal(mpoly, proj_trans_, n_err_, reverse_);
-        new_mpoly.reserve(mpoly.size());
-        for (auto const& poly : mpoly)
-        {
-            geometry::polygon new_poly;
-            if (trans_poly(new_poly, poly))
-            {
-                new_mpoly.emplace_back(new_poly);
-            }
-        }
         if (new_mpoly.empty())
         {
-            return std::move(geometry::geometry_empty());
+            return std::move(geometry_empty());
         }
         return std::move(new_mpoly);
     }
     
-    geometry::geometry operator() (geometry::geometry_collection const & c)
+    geometry operator() (geometry_collection const& c)
     {
-        geometry::geometry_collection new_c;
+        geometry_collection new_c = reproject_internal(c, proj_trans_, n_err_, reverse_);
-        new_c.reserve(c.size());
-        for (auto const& g : c)
-        {
-            geometry::geometry new_g(std::move(reproject(g, proj_trans_, n_err_, reverse_)));
-            if (!new_g.is<geometry::geometry_empty>())
-            {
-                new_c.emplace_back(new_g);
-            }
-        }
         if (new_c.empty())
         {
-            return std::move(geometry::geometry_empty());
+            return std::move(geometry_empty());
         }
         return std::move(new_c);
     }
 
+
   private:
     proj_transform const& proj_trans_;
     unsigned int & n_err_;
@@ -248,10 +308,217 @@ struct geom_reproj_visitor {
 
 } // end detail ns
 
-geometry::geometry reproject(geometry::geometry const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse)
+geometry reproject_copy(geometry const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse)
 {
-    detail::geom_reproj_visitor visit(proj_trans, n_err, reverse);
+    detail::geom_reproj_copy_visitor visit(proj_trans, n_err, reverse);
-    return util::apply_visitor(visit, geom);  
+    return mapnik::util::apply_visitor(visit, geom);
 }
 
+template <typename T>
+T reproject_copy(T const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse)
+{
+    return detail::reproject_internal(geom, proj_trans, n_err, reverse);
+}
+
+template MAPNIK_DECL geometry_empty reproject_copy(geometry_empty const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse);
+template MAPNIK_DECL point reproject_copy(point const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse);
+template MAPNIK_DECL line_string reproject_copy(line_string const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse);
+template MAPNIK_DECL polygon reproject_copy(polygon const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse);
+template MAPNIK_DECL multi_point reproject_copy(multi_point const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse);
+template MAPNIK_DECL multi_line_string reproject_copy(multi_line_string const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse);
+template MAPNIK_DECL multi_polygon reproject_copy(multi_polygon const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse);
+template MAPNIK_DECL geometry_collection reproject_copy(geometry_collection const& geom, proj_transform const& proj_trans, unsigned int & n_err, bool reverse);
+
+template <typename T>
+T reproject_copy(T const& geom, projection const& source, projection const& dest, unsigned int & n_err)
+{
+    proj_transform proj_trans(source, dest);
+    return reproject_copy(geom, proj_trans, n_err, false);
+}
+
+template MAPNIK_DECL geometry reproject_copy(geometry const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+template MAPNIK_DECL geometry_empty reproject_copy(geometry_empty const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+template MAPNIK_DECL point reproject_copy(point const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+template MAPNIK_DECL line_string reproject_copy(line_string const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+template MAPNIK_DECL polygon reproject_copy(polygon const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+template MAPNIK_DECL multi_point reproject_copy(multi_point const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+template MAPNIK_DECL multi_line_string reproject_copy(multi_line_string const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+template MAPNIK_DECL multi_polygon reproject_copy(multi_polygon const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+template MAPNIK_DECL geometry_collection reproject_copy(geometry_collection const& geom, projection const& source, projection const& dest, unsigned int & n_err);
+
+namespace detail {
+
+struct geom_reproj_visitor {
+
+    geom_reproj_visitor(proj_transform const & proj_trans, bool reverse)
+        : proj_trans_(proj_trans), reverse_(reverse) {}
+
+    bool operator() (geometry & geom)
+    {
+        return mapnik::util::apply_visitor((*this), geom);
+    }
+
+    bool operator() (geometry_empty &) { return true; }
+    
+    bool operator() (point & p)
+    {
+        if (!reverse_)
+        {
+            if (!proj_trans_.forward(p))
+            {
+                return false;
+            }
+        }
+        else
+        {
+            if (!proj_trans_.backward(p))
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    bool operator() (line_string & ls)
+    {
+        if (!reverse_)
+        {
+            if (proj_trans_.forward(ls) > 0)
+            {
+                return false;
+            }
+        }
+        else
+        {
+            if (proj_trans_.backward(ls) > 0)
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    bool operator() (polygon & poly)
+    {
+        if (!reverse_)
+        {
+            if (proj_trans_.forward(poly.exterior_ring) > 0)
+            {
+                return false;
+            }
+        }
+        else
+        {
+            if (proj_trans_.backward(poly.exterior_ring) > 0)
+            {
+                return false;
+            }
+        }
+        
+        for (auto & lr : poly.interior_rings)
+        {
+            if (!reverse_)
+            {
+                if (proj_trans_.forward(lr) > 0)
+                {
+                    return false;
+                }
+            }
+            else
+            {
+                if (proj_trans_.backward(lr) > 0)
+                {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+    
+    bool operator() (multi_point & mp)
+    {
+        return (*this) (static_cast<line_string &>(mp));
+    }
+    
+    bool operator() (multi_line_string & mls)
+    {
+        for (auto & ls : mls)
+        {
+            if (! (*this) (ls))
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+    
+    bool operator() (multi_polygon & mpoly)
+    {
+        for (auto & poly : mpoly)
+        {
+            if(! (*this)(poly))
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+    
+    bool operator() (geometry_collection & c)
+    {
+        for (auto & g : c)
+        {
+            if (! (*this)(g) )
+            {
+                return false;
+            }
+        }
+        return true;
+    }
+
+  private:
+    proj_transform const& proj_trans_;
+    bool reverse_;
+
+};
+
+} // end detail ns
+
+template <typename T>
+bool reproject(T & geom, proj_transform const& proj_trans, bool reverse)
+{
+    detail::geom_reproj_visitor visit(proj_trans, reverse);
+    return visit(geom);
+}
+
+template MAPNIK_DECL bool reproject(geometry & geom, proj_transform const& proj_trans, bool reverse);
+template MAPNIK_DECL bool reproject(geometry_empty & geom, proj_transform const& proj_trans, bool reverse);
+template MAPNIK_DECL bool reproject(point & geom, proj_transform const& proj_trans, bool reverse);
+template MAPNIK_DECL bool reproject(line_string & geom, proj_transform const& proj_trans, bool reverse);
+template MAPNIK_DECL bool reproject(polygon & geom, proj_transform const& proj_trans, bool reverse);
+template MAPNIK_DECL bool reproject(multi_point & geom, proj_transform const& proj_trans, bool reverse);
+template MAPNIK_DECL bool reproject(multi_line_string & geom, proj_transform const& proj_trans, bool reverse);
+template MAPNIK_DECL bool reproject(multi_polygon & geom, proj_transform const& proj_trans, bool reverse);
+template MAPNIK_DECL bool reproject(geometry_collection & geom, proj_transform const& proj_trans, bool reverse);
+
+template <typename T>
+bool reproject(T & geom, projection const& source, projection const& dest)
+{
+    proj_transform proj_trans(source, dest);
+    detail::geom_reproj_visitor visit(proj_trans, false);
+    return visit(geom);
+}
+
+template MAPNIK_DECL bool reproject(geometry & geom, projection const& source, projection const& dest);
+template MAPNIK_DECL bool reproject(geometry_empty & geom, projection const& source, projection const& dest);
+template MAPNIK_DECL bool reproject(point & geom, projection const& source, projection const& dest);
+template MAPNIK_DECL bool reproject(line_string & geom, projection const& source, projection const& dest);
+template MAPNIK_DECL bool reproject(polygon & geom, projection const& source, projection const& dest);
+template MAPNIK_DECL bool reproject(multi_point & geom, projection const& source, projection const& dest);
+template MAPNIK_DECL bool reproject(multi_line_string & geom, projection const& source, projection const& dest);
+template MAPNIK_DECL bool reproject(multi_polygon & geom, projection const& source, projection const& dest);
+template MAPNIK_DECL bool reproject(geometry_collection & geom, projection const& source, projection const& dest);
+
+} // end geometry ns
+
 } // end mapnik ns

tests/cxx/geometry_reprojection.cpp

@@ -0,0 +1,277 @@
+#include "catch.hpp"
+//#include "geometry_equal.hpp"
+
+// mapnik
+#include <mapnik/geometry.hpp>
+#include <mapnik/projection.hpp>
+#include <mapnik/proj_transform.hpp>
+#include <mapnik/geometry_reprojection.hpp>
+#include <mapnik/geometry_correct.hpp>
+
+// std
+#include <iostream>
+
+TEST_CASE("geometry reprojection") {
+
+SECTION("test_projection_4326_3857 - Empty Geometry Object") {
+    using namespace mapnik::geometry;
+    mapnik::projection source("+init=epsg:4326");
+    mapnik::projection dest("+init=epsg:3857");
+    mapnik::proj_transform proj_trans(source, dest);
+    {
+        geometry_empty geom;
+        unsigned int err = 0;
+        // Test Standard Transform
+        geometry_empty new_geom = reproject_copy(geom, proj_trans, err);
+        REQUIRE(err == 0);
+        // Transform in reverse
+        new_geom = reproject_copy(geom, proj_trans, err, true);
+        REQUIRE(err == 0);
+        // Transform providing projections not transfrom
+        new_geom = reproject_copy(geom, source, dest, err);
+        REQUIRE(err == 0);
+        // Transform providing projections in reverse
+        new_geom = reproject_copy(geom, dest, source, err);
+        REQUIRE(err == 0);
+        // Transform in place
+        REQUIRE(reproject(new_geom, proj_trans));
+        // Transform in place reverse
+        REQUIRE(reproject(new_geom, proj_trans, true));
+        // Transform in place providing projections
+        REQUIRE(reproject(new_geom, source, dest));
+        // Transform in place provoding projections reversed
+        REQUIRE(reproject(new_geom, dest, source));
+    }
+} // End Section
+
+SECTION("test_projection_4326_3857 - Empty Geometry in Geometry Variant") {
+    using namespace mapnik::geometry;
+    mapnik::projection source("+init=epsg:4326");
+    mapnik::projection dest("+init=epsg:3857");
+    mapnik::proj_transform proj_trans(source, dest);
+    {
+        geometry geom(std::move(geometry_empty()));
+        unsigned int err = 0;
+        // Test Standard Transform
+        geometry new_geom = reproject_copy(geom, proj_trans, err);
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.is<geometry_empty>());
+        // Transform in reverse
+        new_geom = reproject_copy(geom, proj_trans, err, true);
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.is<geometry_empty>());
+        // Transform providing projections not transfrom
+        new_geom = reproject_copy(geom, source, dest, err);
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.is<geometry_empty>());
+        // Transform providing projections in reverse
+        new_geom = reproject_copy(geom, dest, source, err);
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.is<geometry_empty>());
+        // Transform in place
+        REQUIRE(reproject(new_geom, proj_trans));
+        // Transform in place reverse
+        REQUIRE(reproject(new_geom, proj_trans, true));
+        // Transform in place providing projections
+        REQUIRE(reproject(new_geom, source, dest));
+        // Transform in place provoding projections reversed
+        REQUIRE(reproject(new_geom, dest, source));
+    }
+} // End Section
+
+SECTION("test_projection_4326_3857 - Point Geometry Object") {
+    using namespace mapnik::geometry;
+    mapnik::projection source("+init=epsg:4326");
+    mapnik::projection dest("+init=epsg:3857");
+    mapnik::proj_transform proj_trans(source, dest);
+    {
+        point geom1(-97.552175, 35.522895);
+        point geom2(-10859458.446776, 4235169.496066);
+        unsigned int err = 0;
+        // Test Standard Transform
+        point new_geom = reproject_copy(geom1, proj_trans, err);
+        std::cout << std::fixed << new_geom.x << "," << std::fixed << new_geom.y << std::endl;
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.x == Approx(geom2.x));
+        REQUIRE(new_geom.y == Approx(geom2.y));
+        // Transform in reverse
+        new_geom = reproject_copy(geom2, proj_trans, err, true);
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.x == Approx(geom1.x));
+        REQUIRE(new_geom.y == Approx(geom1.y));
+        // Transform providing projections not transfrom
+        new_geom = reproject_copy(geom1, source, dest, err);
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.x == Approx(geom2.x));
+        REQUIRE(new_geom.y == Approx(geom2.y));
+        // Transform providing projections in reverse
+        new_geom = reproject_copy(geom2, dest, source, err);
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.x == Approx(geom1.x));
+        REQUIRE(new_geom.y == Approx(geom1.y));
+        // Transform in place
+        point geom3(-97.552175, 35.522895);
+        REQUIRE(reproject(geom3, proj_trans));
+        REQUIRE(geom3.x == Approx(geom2.x));
+        REQUIRE(geom3.y == Approx(geom2.y));
+        // Transform in place reverse
+        REQUIRE(reproject(geom3, proj_trans, true));
+        REQUIRE(geom3.x == Approx(geom1.x));
+        REQUIRE(geom3.y == Approx(geom1.y));
+        // Transform in place providing projections
+        REQUIRE(reproject(geom3, source, dest));
+        REQUIRE(geom3.x == Approx(geom2.x));
+        REQUIRE(geom3.y == Approx(geom2.y));
+        // Transform in place provoding projections reversed
+        REQUIRE(reproject(geom3, dest, source));
+        REQUIRE(geom3.x == Approx(geom1.x));
+        REQUIRE(geom3.y == Approx(geom1.y));
+    }
+} // End Section
+/*
+SECTION("test_projection_4326_3857 - Point Geometry Object") {
+    using namespace mapnik::geometry;
+    mapnik::projection source("+init=epsg:4326");
+    mapnik::projection dest("+init=epsg:3857");
+    mapnik::proj_transform proj_trans(source, dest);
+    {
+        geometry geom1(point(-97.552175, 35.522895));
+        geometry geom2(point(-10859458.446776, 4235169.496066));
+        unsigned int err = 0;
+        // Test Standard Transform
+        point new_geom = reproject_copy(geom1, proj_trans, err);
+        std::cout << std::fixed << new_geom.x << "," << std::fixed << new_geom.y << std::endl;
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.x == Approx(geom2_.x));
+        REQUIRE(new_geom.y == Approx(geom2_.y));
+        // Transform in reverse
+        new_geom = reproject_copy(geom2, proj_trans, err, true);
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.x == Approx(geom1.x));
+        REQUIRE(new_geom.y == Approx(geom1.y));
+        // Transform providing projections not transfrom
+        new_geom = reproject_copy(geom1, source, dest, err);
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.x == Approx(geom2.x));
+        REQUIRE(new_geom.y == Approx(geom2.y));
+        // Transform providing projections in reverse
+        new_geom = reproject_copy(geom2, dest, source, err);
+        REQUIRE(err == 0);
+        REQUIRE(new_geom.x == Approx(geom1.x));
+        REQUIRE(new_geom.y == Approx(geom1.y));
+        // Transform in place
+        point geom3(-97.552175, 35.522895);
+        REQUIRE(reproject(geom3, proj_trans));
+        REQUIRE(geom3.x == Approx(geom2.x));
+        REQUIRE(geom3.y == Approx(geom2.y));
+        // Transform in place reverse
+        REQUIRE(reproject(geom3, proj_trans, true));
+        REQUIRE(geom3.x == Approx(geom1.x));
+        REQUIRE(geom3.y == Approx(geom1.y));
+        // Transform in place providing projections
+        REQUIRE(reproject(geom3, source, dest));
+        REQUIRE(geom3.x == Approx(geom2.x));
+        REQUIRE(geom3.y == Approx(geom2.y));
+        // Transform in place provoding projections reversed
+        REQUIRE(reproject(geom3, dest, source));
+        REQUIRE(geom3.x == Approx(geom1.x));
+        REQUIRE(geom3.y == Approx(geom1.y));
+    }
+} // End Section */
+    /*{
+        geometry geom(point(0,0));
+        REQUIRE( mapnik::hit_test(geom,0,0,0) );
+    }
+    {
+        geometry geom(point(0,0));
+        REQUIRE( mapnik::hit_test(geom,1,0,1) );
+    }
+    {
+        geometry geom(point(0,0));
+        REQUIRE( mapnik::hit_test(geom,0,1,1) );
+    }
+    {
+        geometry geom(point(0,0));
+        REQUIRE( mapnik::hit_test(geom,1,1,1.5) );
+    }
+    {
+        line_string line;
+        line.add_coord(0,0);
+        line.add_coord(1,1);
+        line.add_coord(2,2);
+        geometry geom(line);
+        REQUIRE( mapnik::hit_test(geom,0,0,1.5) );
+    }
+    {
+        line_string line;
+        line.add_coord(0,0);
+        line.add_coord(1,1);
+        line.add_coord(2,2);
+        multi_line_string multi_line;
+        multi_line.emplace_back(std::move(line));
+        geometry geom(multi_line);
+        REQUIRE( mapnik::hit_test(geom,0,0,1.5) );
+    }
+    {
+        polygon poly;
+        linear_ring ring;
+        ring.add_coord(0,0);
+        ring.add_coord(-10,0);
+        ring.add_coord(-10,10);
+        ring.add_coord(0,10);
+        ring.add_coord(0,0);
+        poly.set_exterior_ring(std::move(ring));
+        geometry geom(poly);
+        REQUIRE( mapnik::hit_test(geom,-5,5,0) );
+
+        multi_polygon mp;
+        mp.push_back(poly);
+        geometry geom_mp(mp);
+        REQUIRE( mapnik::hit_test(geom_mp,-5,5,0) );
+
+        correct(geom);
+        REQUIRE( mapnik::hit_test(geom,-5,5,0) );
+        correct(geom_mp);
+        REQUIRE( mapnik::hit_test(geom_mp,-5,5,0) );
+
+        geometry_collection gc;
+        REQUIRE( !mapnik::hit_test(geometry(gc),-5,5,0) );
+        gc.push_back(geom_mp);
+        REQUIRE( mapnik::hit_test(geometry(gc),-5,5,0) );
+        REQUIRE( !mapnik::hit_test(geometry(gc),-50,-50,0) );
+        gc.emplace_back(point(-50,-50));
+        REQUIRE( mapnik::hit_test(geometry(gc),-50,-50,0) );
+    }
+
+    {
+        // polygon with hole
+        polygon poly;
+        linear_ring ring;
+        ring.add_coord(0,0);
+        ring.add_coord(-10,0);
+        ring.add_coord(-10,10);
+        ring.add_coord(0,10);
+        ring.add_coord(0,0);
+        poly.set_exterior_ring(std::move(ring));
+        linear_ring hole;
+        hole.add_coord(-7,7);
+        hole.add_coord(-7,3);
+        hole.add_coord(-3,3);
+        hole.add_coord(-3,7);
+        hole.add_coord(-7,7);
+        poly.add_hole(std::move(hole));
+        geometry geom(poly);
+        REQUIRE( !mapnik::hit_test(geom,-5,5,0) );
+        // add another hole inside the first hole
+        // which should be considered a hit
+        linear_ring fill;
+        fill.add_coord(-6,4);
+        fill.add_coord(-6,6);
+        fill.add_coord(-4,6);
+        fill.add_coord(-4,4);
+        fill.add_coord(-6,4);
+        poly.add_hole(std::move(fill));
+        REQUIRE( mapnik::hit_test(geometry(poly),-5,5,0) );
+    }*/
+
+} // End Testcase