mapnik/benchmark/src/test_proj_transform1.cpp

#include "bench_framework.hpp"
#include <mapnik/geometry/box2d.hpp>
#include <mapnik/projection.hpp>
#include <mapnik/proj_transform.hpp>

class test : public benchmark::test_case
{
    std::string src_;
    std::string dest_;
    mapnik::box2d<double> from_;
    mapnik::box2d<double> to_;
    bool defer_proj_init_;

  public:
    test(mapnik::parameters const& params,
         std::string const& src,
         std::string const& dest,
         mapnik::box2d<double> const& from,
         mapnik::box2d<double> const& to,
         bool defer_proj)
        : test_case(params)
        , src_(src)
        , dest_(dest)
        , from_(from)
        , to_(to)
        , defer_proj_init_(defer_proj)
    {}
    bool validate() const
    {
        mapnik::projection src(src_, defer_proj_init_);
        mapnik::projection dest(dest_, defer_proj_init_);
        mapnik::proj_transform tr(src, dest);
        mapnik::box2d<double> bbox = from_;
        if (!tr.forward(bbox))
            return false;
        return ((std::fabs(bbox.minx() - to_.minx()) < .5) && (std::fabs(bbox.maxx() - to_.maxx()) < .5) &&
                (std::fabs(bbox.miny() - to_.miny()) < .5) && (std::fabs(bbox.maxy() - to_.maxy()) < .5));
    }
    bool operator()() const
    {
        mapnik::projection src(src_, defer_proj_init_);
        mapnik::projection dest(dest_, defer_proj_init_);
        mapnik::proj_transform tr(src, dest);
        for (std::size_t i = 0; i < iterations_; ++i)
        {
            for (int j = -180; j < 180; j = j + 5)
            {
                for (int k = -85; k < 85; k = k + 5)
                {
                    mapnik::box2d<double> box(j, k, j, k);
                    if (!tr.forward(box))
                        throw std::runtime_error("could not transform coords");
                }
            }
        }
        return true;
    }
};

// echo -180 -60 | cs2cs -f "%.10f" epsg:4326 +to epsg:3857
int main(int argc, char** argv)
{
    mapnik::box2d<double> from(-180, -80, 180, 80);
    mapnik::box2d<double> to(-20037508.3427892476, -15538711.0963092316, 20037508.3427892476, 15538711.0963092316);
    std::string from_str("epsg:4326");
    std::string to_str("epsg:3857");
    std::string from_str2("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs");
    std::string to_str2("+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m "
                        "+nadgrids=@null +wktext +no_defs +over");
    return benchmark::sequencer(argc, argv)
      .run<test>("lonlat->merc epsg (internal)", from_str, to_str, from, to, true)
      .run<test>("lonlat->merc literal (libproj)", from_str2, to_str2, from, to, true)
      .run<test>("merc->lonlat epsg (internal)", to_str, from_str, to, from, true)
      .run<test>("merc->lonlat literal (libproj)", to_str2, from_str2, to, from, true)
      .done();
}