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vector_tile.cpp
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vector_tile.cpp
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#include "catch.hpp"
// test utils
#include "test_utils.hpp"
// mapnik
#include <mapnik/agg_renderer.hpp>
#include <mapnik/datasource_cache.hpp>
#include <mapnik/feature_factory.hpp>
#include <mapnik/geometry.hpp>
#include <mapnik/version.hpp>
#if MAPNIK_VERSION >= 300100
#include <mapnik/geometry/is_empty.hpp>
#include <mapnik/geometry/reprojection.hpp>
#else
#include <mapnik/geometry_is_empty.hpp>
#include <mapnik/geometry_reprojection.hpp>
#endif
#include <mapnik/image_util.hpp>
#include <mapnik/load_map.hpp>
#include <mapnik/memory_datasource.hpp>
#include <mapnik/projection.hpp>
#include <mapnik/proj_transform.hpp>
#include <mapnik/util/file_io.hpp>
#include <mapnik/util/fs.hpp>
#include <mapnik/util/geometry_to_geojson.hpp>
#include <mapnik/vertex_adapters.hpp>
// boost
#include <boost/optional/optional_io.hpp>
// mapnik-vector-tile
#include "vector_tile_processor.hpp"
#include "vector_tile_geometry_decoder.hpp"
#include "vector_tile_datasource_pbf.hpp"
// libprotobuf
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#pragma GCC diagnostic ignored "-Wsign-conversion"
#include "vector_tile.pb.h"
#pragma GCC diagnostic pop
// std
#include <fstream>
TEST_CASE("vector tile from simplified geojson")
{
unsigned tile_size = 256 * 100;
mapnik::Map map(256,256,"epsg:3857");
mapnik::layer lyr("layer","epsg:4326");
std::shared_ptr<mapnik::memory_datasource> ds = testing::build_geojson_ds("./test/data/poly.geojson");
ds->set_envelope(mapnik::box2d<double>(160.147311,11.047284,160.662858,11.423830));
lyr.set_datasource(ds);
map.add_layer(lyr);
mapnik::vector_tile_impl::processor ren(map);
mapnik::vector_tile_impl::tile out_tile = ren.create_tile(0,0,0,tile_size);
CHECK(out_tile.is_painted() == true);
CHECK(out_tile.is_empty() == false);
vector_tile::Tile tile;
tile.ParseFromString(out_tile.get_buffer());
REQUIRE(1 == tile.layers_size());
vector_tile::Tile_Layer const& layer = tile.layers(0);
CHECK(std::string("layer") == layer.name());
REQUIRE(1 == layer.features_size());
vector_tile::Tile_Feature const& f = layer.features(0);
unsigned z = 0;
unsigned x = 0;
unsigned y = 0;
double resolution = mapnik::EARTH_CIRCUMFERENCE/(1 << z);
double tile_x = -0.5 * mapnik::EARTH_CIRCUMFERENCE + x * resolution;
double tile_y = 0.5 * mapnik::EARTH_CIRCUMFERENCE - y * resolution;
double scale = static_cast<double>(layer.extent())/resolution;
protozero::pbf_reader layer_reader;
out_tile.layer_reader(0, layer_reader);
REQUIRE(layer_reader.next(mapnik::vector_tile_impl::Layer_Encoding::FEATURES));
protozero::pbf_reader feature_reader = layer_reader.get_message();
int32_t geometry_type = mapnik::vector_tile_impl::Geometry_Type::UNKNOWN;
mapnik::vector_tile_impl::GeometryPBF::pbf_itr geom_itr;
while (feature_reader.next())
{
if (feature_reader.tag() == mapnik::vector_tile_impl::Feature_Encoding::GEOMETRY)
{
geom_itr = feature_reader.get_packed_uint32();
}
else if (feature_reader.tag() == mapnik::vector_tile_impl::Feature_Encoding::TYPE)
{
geometry_type = feature_reader.get_enum();
}
else
{
feature_reader.skip();
}
}
mapnik::vector_tile_impl::GeometryPBF geoms(geom_itr);
auto geom = mapnik::vector_tile_impl::decode_geometry<double>(geoms, geometry_type, 2, tile_x, tile_y, scale, -1.0 * scale);
unsigned int n_err = 0;
mapnik::projection wgs84("epsg:4326",true);
mapnik::projection merc("epsg:3857",true);
mapnik::proj_transform prj_trans(merc,wgs84);
mapnik::geometry::geometry<double> projected_geom = mapnik::geometry::reproject_copy(geom,prj_trans,n_err);
CHECK( n_err == 0 );
std::string geojson_string;
CHECK( mapnik::util::to_geojson(geojson_string,projected_geom) );
std::string geojson_file = "./test/data/simplified_geometry.geojson";
mapnik::util::file input(geojson_file);
if (input.is_open())
{
std::string json_string(input.data().get(), input.size());
CHECK (geojson_string == json_string);
}
if (!mapnik::util::exists(geojson_file) || (std::getenv("UPDATE") != nullptr))
{
std::ofstream out(geojson_file);
out << geojson_string;
}
}
TEST_CASE("vector tile transform -- should not throw on coords outside merc range")
{
unsigned tile_size = 256 * 64;
mapnik::Map map(256,256,"epsg:3857");
// Note: 4269 is key. 4326 will trigger custom mapnik reprojection code
// that does not hit proj4 and clamps values
mapnik::layer lyr("layer","epsg:4269");
mapnik::parameters params;
params["type"] = "shape";
params["file"] = "./test/data/poly-lat-invalid-4269.shp";
std::shared_ptr<mapnik::datasource> ds =
mapnik::datasource_cache::instance().create(params);
lyr.set_datasource(ds);
map.add_layer(lyr);
mapnik::vector_tile_impl::processor ren(map);
mapnik::vector_tile_impl::tile out_tile = ren.create_tile(0,0,0,tile_size);
CHECK(out_tile.is_painted() == true);
CHECK(out_tile.is_empty() == false);
vector_tile::Tile tile;
tile.ParseFromString(out_tile.get_buffer());
// serialize to message
std::string buffer;
CHECK(tile.SerializeToString(&buffer));
CHECK(71 == buffer.size());
// now create new objects
mapnik::Map map2(256,256,"epsg:3857");
vector_tile::Tile tile2;
CHECK(tile2.ParseFromString(buffer));
CHECK(1 == tile2.layers_size());
vector_tile::Tile_Layer const& layer2 = tile2.layers(0);
CHECK(std::string("layer") == layer2.name());
CHECK(1 == layer2.features_size());
CHECK(1 == layer2.features(0).id());
CHECK(3 == layer2.features(0).type());
mapnik::layer lyr2("layer",map.srs());
protozero::pbf_reader layer_reader;
out_tile.layer_reader(0, layer_reader);
std::shared_ptr<mapnik::vector_tile_impl::tile_datasource_pbf> ds2 = std::make_shared<
mapnik::vector_tile_impl::tile_datasource_pbf>(
layer_reader,0,0,0);
//ds2->set_envelope(bbox);
CHECK( ds2->type() == mapnik::datasource::Vector );
CHECK( ds2->get_geometry_type() == mapnik::datasource_geometry_t::Collection );
mapnik::layer_descriptor lay_desc = ds2->get_descriptor();
std::vector<std::string> expected_names;
expected_names.push_back("FID");
std::vector<std::string> names;
for (auto const& desc : lay_desc.get_descriptors())
{
names.push_back(desc.get_name());
}
CHECK(names == expected_names);
lyr2.set_datasource(ds2);
lyr2.add_style("style");
map2.add_layer(lyr2);
mapnik::load_map(map2,"test/data/polygon-style.xml");
//std::clog << mapnik::save_map_to_string(map2) << "\n";
map2.zoom_all();
mapnik::image_rgba8 im(map2.width(),map2.height());
mapnik::agg_renderer<mapnik::image_rgba8> ren2(map2,im);
ren2.apply();
if (!mapnik::util::exists("test/fixtures/transform-expected-1.png"))
{
mapnik::save_to_file(im,"test/fixtures/transform-expected-1.png","png32");
}
unsigned diff = testing::compare_images(im,"test/fixtures/transform-expected-1.png");
CHECK(0 == diff);
if (diff > 0)
{
mapnik::save_to_file(im,"test/fixtures/transform-actual-1.png","png32");
}
}
TEST_CASE("vector tile transform2 -- should not throw reprojected data from local NZ projection")
{
unsigned tile_size = 256 * 64;
mapnik::box2d<double> bbox(-20037508.342789,-20037508.342789,20037508.342789,20037508.342789);
mapnik::Map map(256,256,"epsg:3857");
// Note: 4269 is key. 4326 will trigger custom mapnik reprojection code
// that does not hit proj4 and clamps values
mapnik::layer lyr("layer","+proj=nzmg +lat_0=-41 +lon_0=173 +x_0=2510000 +y_0=6023150 +ellps=intl +units=m +no_defs");
mapnik::parameters params;
params["type"] = "shape";
params["file"] = "./test/data/NZ_Coastline_NZMG.shp";
std::shared_ptr<mapnik::datasource> ds =
mapnik::datasource_cache::instance().create(params);
lyr.set_datasource(ds);
map.add_layer(lyr);
mapnik::vector_tile_impl::processor ren(map);
mapnik::vector_tile_impl::tile out_tile = ren.create_tile(0,0,0,tile_size);
CHECK(out_tile.is_painted() == true);
CHECK(out_tile.is_empty() == false);
vector_tile::Tile tile;
tile.ParseFromString(out_tile.get_buffer());
// serialize to message
std::string buffer;
CHECK(tile.SerializeToString(&buffer));
CHECK(231 == buffer.size());
// now create new objects
mapnik::Map map2(256,256,"epsg:3857");
vector_tile::Tile tile2;
CHECK(tile2.ParseFromString(buffer));
CHECK(1 == tile2.layers_size());
vector_tile::Tile_Layer const& layer2 = tile2.layers(0);
CHECK(std::string("layer") == layer2.name());
CHECK(2 == layer2.features_size());
mapnik::layer lyr2("layer",map.srs());
protozero::pbf_reader layer_reader;
out_tile.layer_reader(0, layer_reader);
std::shared_ptr<mapnik::vector_tile_impl::tile_datasource_pbf> ds2 = std::make_shared<
mapnik::vector_tile_impl::tile_datasource_pbf>(
layer_reader,0,0,0);
ds2->set_envelope(bbox);
CHECK( ds2->type() == mapnik::datasource::Vector );
CHECK( ds2->get_geometry_type() == mapnik::datasource_geometry_t::Collection );
mapnik::layer_descriptor lay_desc = ds2->get_descriptor();
std::vector<std::string> expected_names;
expected_names.push_back("featurecla");
expected_names.push_back("scalerank");
std::vector<std::string> names;
for (auto const& desc : lay_desc.get_descriptors())
{
names.push_back(desc.get_name());
}
CHECK(names == expected_names);
lyr2.set_datasource(ds2);
lyr2.add_style("style");
map2.add_layer(lyr2);
mapnik::load_map(map2,"test/data/polygon-style.xml");
//std::clog << mapnik::save_map_to_string(map2) << "\n";
map2.zoom_to_box(bbox);
mapnik::image_rgba8 im(map2.width(),map2.height());
mapnik::agg_renderer<mapnik::image_rgba8> ren2(map2,im);
ren2.apply();
if (!mapnik::util::exists("test/fixtures/transform-expected-2.png")) {
mapnik::save_to_file(im,"test/fixtures/transform-expected-2.png","png32");
}
unsigned diff = testing::compare_images(im,"test/fixtures/transform-expected-2.png");
CHECK(0 == diff);
if (diff > 0) {
mapnik::save_to_file(im,"test/fixtures/transform-actual-2.png","png32");
}
}