TEST_CASE("vector tile from simplified geojson")
{
unsigned tile_size = 256 * 100;
mapnik::Map map(256,256,"+init=epsg:3857");
mapnik::layer lyr("layer","+init=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);
#pragma GCC diagnostic ignored "-Wsign-conversion"
#include "vector_tile.pb.h"
#pragma GCC diagnostic pop
TEST_CASE("pbf vector tile input")
{
unsigned tile_size = 4096;
mapnik::Map map(256,256,"+init=epsg:3857");
mapnik::layer lyr("layer",map.srs());
lyr.set_datasource(testing::build_ds(0,0));
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(147 == buffer.size());
// now create new objects
mapnik::Map map2(256,256,"+init=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());
mapnik::layer lyr2("layer",map.srs());
void OutputTile(bool verbose, vector_tile::Tile& tile)
{
if (!verbose) {
std::cout << "layers: " << static_cast<std::size_t>(tile.layers_size()) << "\n";
for (std::size_t i = 0; i<static_cast<std::size_t>(tile.layers_size()); ++i)
{
vector_tile::Tile_Layer const& layer = tile.layers(i);
const double tileScale = 1.0 / layer.extent();
std::cout << layer.name() << ":\n";
std::cout << " version: " << layer.version() << "\n";
std::cout << " extent: " << layer.extent() << "\n";
std::cout << " features: " << static_cast<std::size_t>(layer.features_size()) << "\n";
std::cout << " keys: " << static_cast<std::size_t>(layer.keys_size()) << "\n";
std::cout << " values: " << static_cast<std::size_t>(layer.values_size()) << "\n";
unsigned total_repeated = 0;
unsigned num_commands = 0;
unsigned num_move_to = 0;
unsigned num_line_to = 0;
unsigned num_close = 0;
unsigned num_empty = 0;
unsigned degenerate = 0;
vector<Polygon> polygons;
vector<TPolygon2D<double>> lineStrings;
uint64_t lastFeatureId = 0;
for (std::size_t j = 0; j<static_cast<std::size_t>(layer.features_size()); ++j)
{
int32_t cursorX = 0;
int32_t cursorY = 0;
vector_tile::Tile_Feature const & f = layer.features(j);
total_repeated += f.geometry_size();
int cmd = -1;
const int cmd_bits = 3;
unsigned length = 0;
unsigned g_length = 0;
vector<TPolygon2D<int32_t>> polys;
TPolygon2D<int32_t> poly;
for (int k = 0; k < f.geometry_size();)
{
if (!length) {
unsigned cmd_length = f.geometry(k++);
cmd = cmd_length & ((1 << cmd_bits) - 1);
length = cmd_length >> cmd_bits;
if (length <= 0) num_empty++;
num_commands++;
}
if (length > 0) {
length--;
if (cmd == SEG_MOVETO || cmd == SEG_LINETO)
{
uint32_t xZigZag = f.geometry(k++);
uint32_t yZigZag = f.geometry(k++);
int32_t xRel = ZigZagUint32ToInt32(xZigZag);
int32_t yRel = ZigZagUint32ToInt32(yZigZag);
cursorX += xRel;
cursorY += yRel;
g_length++;
if (cmd == SEG_MOVETO)
{
if (poly.GetNumVertices() > 0)
{
polys.push_back(move(poly));
poly = TPolygon2D<int32_t>();
poly.ReserveNumVertices(10);
}
num_move_to++;
}
else if (cmd == SEG_LINETO)
{
num_line_to++;
}
poly.AddVertex(TVector2D<int32_t>(cursorX, cursorY));
}
else if (cmd == (SEG_CLOSE & ((1 << cmd_bits) - 1)))
{
if (g_length <= 2) degenerate++;
g_length = 0;
num_close++;
polys.push_back(move(poly));
poly = TPolygon2D<int32_t>();
poly.ReserveNumVertices(10);
}
else
{
std::stringstream s;
s << "Unknown command type: " << cmd;
throw std::runtime_error(s.str());
}
}
}
if (f.type() == vector_tile::Tile_GeomType_POLYGON)
{
size_t polyStartIndex = 0;
for (size_t p = 0; p < polys.size(); p++)
{
int64_t polyArea = polys[p].ComputeArea<int64_t>();
if (p > polyStartIndex && polyArea < 0) // test for multipolygons including interior polys
{
auto& poly = polys[polyStartIndex];
const auto* nextPoly = &polys[polyStartIndex + 1];
Polygon polygon(f.id(), tileScale, poly,
(polyStartIndex + 1 < polys.size() ) ? nextPoly : NULL,
(uint32_t)(p - polyStartIndex - 1));
polygons.push_back(move(polygon));
polyStartIndex = p;
}
}
if (polyStartIndex < polys.size())
{
Polygon polygon(f.id(), tileScale, polys[polyStartIndex],
(polyStartIndex + 1 < polys.size()) ? &polys[polyStartIndex + 1] : NULL,
(uint32_t)(polys.size() - 1 - polyStartIndex));
polygons.push_back(move(polygon));
}
}
else if (f.type() == vector_tile::Tile_GeomType_LINESTRING)
{
polys.push_back(move(poly));
for (const auto& p : polys)
{
lineStrings.push_back(move(p.Clone<double>(tileScale)));
}
}
}
std::cout << " geometry summary:\n";
std::cout << " total: " << total_repeated << "\n";
std::cout << " commands: " << num_commands << "\n";
std::cout << " move_to: " << num_move_to << "\n";
std::cout << " line_to: " << num_line_to << "\n";
std::cout << " close: " << num_close << "\n";
std::cout << " degenerate polygons: " << degenerate << "\n";
std::cout << " empty geoms: " << num_empty << "\n";
std::cout << " NUM POLYGONS: " << polygons.size() << "\n";
std::cout << " NUM LINE STRINGS: " << lineStrings.size() << "\n";
}