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#include "catch.hpp"
#include <mapnik/projection.hpp>
#include <mapnik/proj_transform.hpp>
#include <mapnik/box2d.hpp>
#ifdef MAPNIK_USE_PROJ4
// proj4
#include <proj_api.h>
#endif
TEST_CASE("projection transform")
{
SECTION("Test bounding box transforms - 4326 to 3857")
{
mapnik::projection proj_4326("+init=epsg:4326");
mapnik::projection proj_3857("+init=epsg:3857");
mapnik::proj_transform prj_trans(proj_4326, proj_3857);
double minx = -45.0;
double miny = 55.0;
double maxx = -40.0;
double maxy = 75.0;
mapnik::box2d<double> bbox(minx, miny, maxx, maxy);
prj_trans.forward(bbox);
INFO(bbox.to_string());
CHECK(bbox.minx() == Approx(-5009377.085697311));
CHECK(bbox.miny() == Approx(7361866.1130511891));
CHECK(bbox.maxx() == Approx(-4452779.631730943));
CHECK(bbox.maxy() == Approx(12932243.1119920239));
prj_trans.backward(bbox);
CHECK(bbox.minx() == Approx(minx));
CHECK(bbox.miny() == Approx(miny));
CHECK(bbox.maxx() == Approx(maxx));
CHECK(bbox.maxy() == Approx(maxy));
}
#if defined(MAPNIK_USE_PROJ4) && PJ_VERSION >= 480
SECTION("test pj_transform failure behavior")
{
mapnik::projection proj_4269("+init=epsg:4269");
mapnik::projection proj_3857("+init=epsg:3857");
mapnik::proj_transform prj_trans(proj_4269, proj_3857);
mapnik::proj_transform prj_trans2(proj_3857, proj_4269);
auto proj_ctx0 = pj_ctx_alloc();
REQUIRE( proj_ctx0 != nullptr );
auto proj0 = pj_init_plus_ctx(proj_ctx0, proj_4269.params().c_str());
REQUIRE( proj0 != nullptr );
auto proj_ctx1 = pj_ctx_alloc();
REQUIRE( proj_ctx1 != nullptr );
auto proj1 = pj_init_plus_ctx(proj_ctx1, proj_3857.params().c_str());
REQUIRE( proj1 != nullptr );
// first test valid values directly against proj
double x = -180.0;
double y = -60.0;
x *= DEG_TO_RAD;
y *= DEG_TO_RAD;
CHECK( x == Approx(-3.1415926536) );
CHECK( y == Approx(-1.0471975512) );
CHECK( 0 == pj_transform(proj0, proj1, 1, 0, &x, &y, nullptr) );
CHECK( x == Approx(-20037508.3427892439) );
CHECK( y == Approx(-8399737.8896366451) );
// now test mapnik class
double x0 = -180.0;
double y0 = -60.0;
CHECK( prj_trans.forward(&x0,&y0,nullptr,1,1) );
CHECK( x0 == Approx(-20037508.3427892439) );
CHECK( y0 == Approx(-8399737.8896366451) );
double x1 = -180.0;
double y1 = -60.0;
CHECK( prj_trans2.backward(&x1,&y1,nullptr,1,1) );
CHECK( x1 == Approx(-20037508.3427892439) );
CHECK( y1 == Approx(-8399737.8896366451) );
// longitude value outside the value range for mercator
x = -181.0;
y = -91.0;
x *= DEG_TO_RAD;
y *= DEG_TO_RAD;
CHECK( x == Approx(-3.1590459461) );
CHECK( y == Approx(-1.5882496193) );
CHECK( 0 == pj_transform(proj0, proj1, 1, 0, &x, &y, nullptr) );
CHECK( std::isinf(x) );
CHECK( std::isinf(y) );
// now test mapnik class
double x2 = -181.0;
double y2 = -91.0;
CHECK( false == prj_trans.forward(&x2,&y2,nullptr,1,1) );
CHECK( std::isinf(x2) );
CHECK( std::isinf(y2) );
double x3 = -181.0;
double y3 = -91.0;
CHECK( false == prj_trans2.backward(&x3,&y3,nullptr,1,1) );
CHECK( std::isinf(x3) );
CHECK( std::isinf(y3) );
// cleanup
pj_ctx_free(proj_ctx0);
proj_ctx0 = nullptr;
pj_free(proj0);
proj0 = nullptr;
pj_ctx_free(proj_ctx1);
proj_ctx1 = nullptr;
pj_free(proj1);
proj1 = nullptr;
}
#endif
// Github Issue https://github.com/mapnik/mapnik/issues/2648
SECTION("Test proj antimeridian bbox")
{
mapnik::projection prj_geog("+init=epsg:4326");
mapnik::projection prj_proj("+init=epsg:2193");
mapnik::proj_transform prj_trans_fwd(prj_proj, prj_geog);
mapnik::proj_transform prj_trans_rev(prj_geog, prj_proj);
// reference values taken from proj4 command line tool:
// (non-corner points assume PROJ_ENVELOPE_POINTS == 20)
//
// cs2cs -Ef %.10f +init=epsg:2193 +to +init=epsg:4326 <<END
// 2105800 3087000 # left-most
// 1495200 3087000 # bottom-most
// 2105800 7173000 # right-most
// 3327000 7173000 # top-most
// END
//
// wrong = mapnik.Box2d(-177.3145325044, -62.3337481525,
// 178.0277836332, -24.5845974912)
const mapnik::box2d<double> better(-180.0, -62.3337481525,
180.0, -24.5845974912);
{
mapnik::box2d<double> ext(274000, 3087000, 3327000, 7173000);
prj_trans_fwd.forward(ext, PROJ_ENVELOPE_POINTS);
CHECK(ext.minx() == Approx(better.minx()));
CHECK(ext.miny() == Approx(better.miny()));
CHECK(ext.maxx() == Approx(better.maxx()));
CHECK(ext.maxy() == Approx(better.maxy()));
}
{
// check the same logic works for .backward()
mapnik::box2d<double> ext(274000, 3087000, 3327000, 7173000);
prj_trans_rev.backward(ext, PROJ_ENVELOPE_POINTS);
CHECK(ext.minx() == Approx(better.minx()));
CHECK(ext.miny() == Approx(better.miny()));
CHECK(ext.maxx() == Approx(better.maxx()));
CHECK(ext.maxy() == Approx(better.maxy()));
}
// reference values taken from proj4 command line tool:
//
// cs2cs -Ef %.10f +init=epsg:2193 +to +init=epsg:4326 <<END
// 274000 3087000 # left-most
// 276000 3087000 # bottom-most
// 276000 7173000 # right-most
// 274000 7173000 # top-most
// END
//
const mapnik::box2d<double> normal(148.7667597489, -60.1222810241,
159.9548489296, -24.9771195155);
{
// checks for not being snapped (ie. not antimeridian)
mapnik::box2d<double> ext(274000, 3087000, 276000, 7173000);
prj_trans_fwd.forward(ext, PROJ_ENVELOPE_POINTS);
CHECK(ext.minx() == Approx(normal.minx()));
CHECK(ext.miny() == Approx(normal.miny()));
CHECK(ext.maxx() == Approx(normal.maxx()));
CHECK(ext.maxy() == Approx(normal.maxy()));
}
{
// check the same logic works for .backward()
mapnik::box2d<double> ext(274000, 3087000, 276000, 7173000);
prj_trans_rev.backward(ext, PROJ_ENVELOPE_POINTS);
CHECK(ext.minx() == Approx(normal.minx()));
CHECK(ext.miny() == Approx(normal.miny()));
CHECK(ext.maxx() == Approx(normal.maxx()));
CHECK(ext.maxy() == Approx(normal.maxy()));
}
}
}
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