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Most of the way to making decode output GeoJSON

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This commit is contained in:
Eric Fischer 2015-10-09 12:41:28 -07:00
parent 329f041bf2
commit 0b47471777
1 changed files with 137 additions and 6 deletions
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143
decode.cc
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@ -6,6 +6,7 @@
#include <zlib.h>
#include <math.h>
#include "vector_tile.pb.h"
#include "tile.h"
extern "C" {
#include "projection.h"
@ -51,8 +52,35 @@ int dezig(unsigned n) {
return (n >> 1) ^ (-(n & 1));
}
void printq(const char *s) {
putchar('"');
for (; *s; s++) {
if (*s == '\\' || *s == '"') {
printf("\\%c", *s);
} else if (*s >= 0 && *s < ' ') {
printf("\\u%04x", *s);
} else {
putchar(*s);
}
}
putchar('"');
}
struct draw {
int op;
double lon;
double lat;
draw(int op, double lon, double lat) {
this->op = op;
this->lon = lon;
this->lat = lat;
}
};
void handle(std::string message, int z, unsigned x, unsigned y) {
GOOGLE_PROTOBUF_VERIFY_VERSION;
int within = 0;
// https://github.com/mapbox/mapnik-vector-tile/blob/master/examples/c%2B%2B/tileinfo.cpp
mapnik::vector::tile tile;
@ -69,6 +97,8 @@ void handle(std::string message, int z, unsigned x, unsigned y) {
exit(EXIT_FAILURE);
}
printf("{ \"type\": \"FeatureCollection\", \"features\": [\n");
for (int l = 0; l < tile.layers_size(); l++) {
mapnik::vector::tile_layer layer = tile.layers(l);
int extent = layer.extent();
@ -77,16 +107,57 @@ void handle(std::string message, int z, unsigned x, unsigned y) {
mapnik::vector::tile_feature feat = layer.features(f);
int px = 0, py = 0;
if (within) {
printf(",\n");
}
within = 1;
printf("{ \"type\": \"Feature\"");
printf(", \"properties\": { ");
for (unsigned t = 0; t + 1 < feat.tags_size(); t += 2) {
if (t != 0) {
printf(", ");
}
const char *key = layer.keys(feat.tags(t)).c_str();
mapnik::vector::tile_value const &val = layer.values(feat.tags(t + 1));
if (val.has_string_value()) {
printq(key);
printf(": ");
printq(val.string_value().c_str());
} else if (val.has_int_value()) {
printq(key);
printf(": %lld", (long long) val.int_value());
} else if (val.has_double_value()) {
printq(key);
printf(": %g", val.double_value());
} else if (val.has_float_value()) {
printq(key);
printf(": %g", val.float_value());
} else if (val.has_sint_value()) {
printq(key);
printf(": %lld", (long long) val.sint_value());
} else if (val.has_uint_value()) {
printq(key);
printf(": %lld", (long long) val.uint_value());
} else if (val.has_bool_value()) {
printq(key);
printf(": %s", val.bool_value() ? "true" : "false");
}
}
printf(" }, \"geometry\": { ");
std::vector<draw> ops;
for (int g = 0; g < feat.geometry_size(); g++) {
uint32_t geom = feat.geometry(g);
uint32_t op = geom & 7;
uint32_t count = geom >> 3;
if (op == 1 || op == 2) {
if (op == 1) {
printf("\n");
}
if (op == VT_MOVETO || op == VT_LINETO) {
for (unsigned k = 0; k < count; k++) {
px += dezig(feat.geometry(g + 1));
py += dezig(feat.geometry(g + 2));
@ -98,12 +169,72 @@ void handle(std::string message, int z, unsigned x, unsigned y) {
double lat, lon;
tile2latlon(wx, wy, 32, &lat, &lon);
printf("%f,%f ", lat, lon);
ops.push_back(draw(op, lon, lat));
}
} else {
ops.push_back(draw(op, 0, 27));
}
}
if (feat.type() == VT_POINT) {
if (ops.size() == 1) {
printf("\"type\": \"Point\", \"coordinates\": [ %f, %f ]", ops[0].lon, ops[0].lat);
} else {
printf("\"type\": \"MultiPoint\", \"coordinates\": [ ");
for (unsigned i = 0; i < ops.size(); i++) {
if (i != 0) {
printf(", ");
}
printf("[ %f, %f ]", ops[i].lon, ops[i].lat);
}
printf(" ]");
}
} else if (feat.type() == VT_LINE) {
int movetos = 0;
for (unsigned i = 0; i < ops.size(); i++) {
if (ops[i].op == VT_MOVETO) {
movetos++;
}
}
if (movetos < 2) {
printf("\"type\": \"LineString\", \"coordinates\": [ ");
for (unsigned i = 0; i < ops.size(); i++) {
if (i != 0) {
printf(", ");
}
printf("[ %f, %f ]", ops[i].lon, ops[i].lat);
}
printf(" ]");
} else {
printf("\"type\": \"MultiLineString\", \"coordinates\": [ [ ");
int state = 0;
for (unsigned i = 0; i < ops.size(); i++) {
if (ops[i].op == VT_MOVETO) {
if (state == 0) {
printf("[ %f, %f ]", ops[i].lon, ops[i].lat);
state = 1;
} else {
printf(" ], [ ");
printf("[ %f, %f ]", ops[i].lon, ops[i].lat);
state = 1;
}
} else {
printf(", [ %f, %f ]", ops[i].lon, ops[i].lat);
}
}
printf(" ] ]");
}
} else if (feat.type() == VT_POLYGON) {
}
printf(" } }\n");
}
}
printf("] }\n");
}
void decode(char *fname, int z, unsigned x, unsigned y) {