mirror of
https://github.com/mapbox/tippecanoe.git
synced 2025-02-02 01:08:14 +00:00
276 lines
6.8 KiB
C
276 lines
6.8 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include "jsonpull.h"
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#define GEOM_POINT 0 /* array of positions */
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#define GEOM_MULTIPOINT 1 /* array of arrays of positions */
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#define GEOM_LINESTRING 2 /* array of arrays of positions */
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#define GEOM_MULTILINESTRING 3 /* array of arrays of arrays of positions */
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#define GEOM_POLYGON 4 /* array of arrays of arrays of positions */
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#define GEOM_MULTIPOLYGON 5 /* array of arrays of arrays of arrays of positions */
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#define GEOM_TYPES 6
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#define VT_END 0
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#define VT_POINT 1
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#define VT_LINE 2
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#define VT_POLYGON 3
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#define VT_MOVETO 1
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#define VT_LINETO 2
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#define VT_CLOSEPATH 7
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#define VT_STRING 1
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#define VT_NUMBER 2
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#define VT_BOOLEAN 7
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char *geometry_names[GEOM_TYPES] = {
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"Point",
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"MultiPoint",
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"LineString",
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"MultiLineString",
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"Polygon",
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"MultiPolygon",
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};
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int geometry_within[GEOM_TYPES] = {
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-1, /* point */
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GEOM_POINT, /* multipoint */
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GEOM_POINT, /* linestring */
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GEOM_LINESTRING, /* multilinestring */
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GEOM_LINESTRING, /* polygon */
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GEOM_POLYGON, /* multipolygon */
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};
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int mb_geometry[GEOM_TYPES] = {
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VT_POINT,
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VT_POINT,
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VT_LINE,
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VT_LINE,
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VT_POLYGON,
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VT_POLYGON,
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};
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// http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
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void latlon2tile(double lat, double lon, int zoom, unsigned int *x, unsigned int *y) {
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double lat_rad = lat * M_PI / 180;
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unsigned long long n = 1LL << zoom;
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*x = n * ((lon + 180) / 360);
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*y = n * (1 - (log(tan(lat_rad) + 1/cos(lat_rad)) / M_PI)) / 2;
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}
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void serialize_int(FILE *out, int n, long long *fpos) {
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fwrite(&n, sizeof(int), 1, out);
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*fpos += sizeof(int);
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}
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void serialize_uint(FILE *out, unsigned n, long long *fpos) {
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fwrite(&n, sizeof(unsigned), 1, out);
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*fpos += sizeof(unsigned);
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}
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void serialize_string(FILE *out, char *s, long long *fpos) {
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int len = strlen(s);
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serialize_int(out, len, fpos);
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fwrite(s, sizeof(char), len, out);
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*fpos += len;
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}
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void parse_geometry(int t, json_object *j, unsigned *bbox, long long *fpos, FILE *out, int op) {
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if (j == NULL || j->type != JSON_ARRAY) {
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fprintf(stderr, "expected array for type %d\n", t);
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return;
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}
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int within = geometry_within[t];
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if (within >= 0) {
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int i;
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for (i = 0; i < j->length; i++) {
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if (within == GEOM_POINT) {
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if (i == 0 || t == GEOM_MULTIPOINT) {
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op = VT_MOVETO;
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} else {
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op = VT_LINETO;
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}
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}
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parse_geometry(within, j->array[i], bbox, fpos, out, op);
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}
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} else {
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if (j->length == 2 && j->array[0]->type == JSON_NUMBER && j->array[1]->type == JSON_NUMBER) {
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unsigned x, y;
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double lon = j->array[0]->number;
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double lat = j->array[1]->number;
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latlon2tile(lat, lon, 32, &x, &y);
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if (bbox != NULL) {
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if (x < bbox[0]) {
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bbox[0] = x;
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}
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if (y < bbox[1]) {
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bbox[1] = y;
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}
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if (x > bbox[2]) {
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bbox[2] = x;
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}
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if (y > bbox[3]) {
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bbox[3] = y;
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}
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}
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serialize_int(out, op, fpos);
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serialize_uint(out, x, fpos);
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serialize_uint(out, y, fpos);
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} else {
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fprintf(stderr, "malformed point");
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}
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}
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if (t == GEOM_POLYGON) {
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serialize_int(out, VT_CLOSEPATH, fpos);
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}
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}
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void read_json(FILE *f) {
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json_pull *jp = json_begin_file(f);
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FILE *out = fopen("meta.out", "wb");
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long long fpos = 0;
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while (1) {
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json_object *j = json_read(jp);
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if (j == NULL) {
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if (jp->error != NULL) {
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fprintf(stderr, "%d: %s\n", jp->line, jp->error);
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}
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json_free(jp->root);
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break;
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}
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json_object *type = json_hash_get(j, "type");
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if (type == NULL || type->type != JSON_STRING || strcmp(type->string, "Feature") != 0) {
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continue;
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}
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json_object *geometry = json_hash_get(j, "geometry");
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if (geometry == NULL) {
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fprintf(stderr, "%d: feature with no geometry\n", jp->line);
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goto next_feature;
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}
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json_object *geometry_type = json_hash_get(geometry, "type");
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if (geometry_type == NULL || geometry_type->type != JSON_STRING) {
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fprintf(stderr, "%d: geometry without type string\n", jp->line);
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goto next_feature;
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}
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json_object *properties = json_hash_get(j, "properties");
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if (properties == NULL || properties->type != JSON_HASH) {
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fprintf(stderr, "%d: feature without properties hash\n", jp->line);
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goto next_feature;
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}
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json_object *coordinates = json_hash_get(geometry, "coordinates");
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if (coordinates == NULL || coordinates->type != JSON_ARRAY) {
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fprintf(stderr, "%d: feature without coordinates array\n", jp->line);
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goto next_feature;
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}
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int t;
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for (t = 0; t < GEOM_TYPES; t++) {
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if (strcmp(geometry_type->string, geometry_names[t]) == 0) {
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break;
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}
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}
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if (t >= GEOM_TYPES) {
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fprintf(stderr, "%d: Can't handle geometry type %s\n", jp->line, geometry_type->string);
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goto next_feature;
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}
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/* scope for variable-length arrays */
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{
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char *metakey[properties->length];
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char *metaval[properties->length];
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int metatype[properties->length];
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int m = 0;
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int i;
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for (i = 0; i < properties->length; i++) {
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if (properties->keys[i]->type == JSON_STRING) {
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metakey[m] = properties->keys[i]->string;
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if (properties->values[i] != NULL && properties->values[i]->type == JSON_STRING) {
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metatype[m] = VT_STRING;
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metaval[m] = properties->values[i]->string;
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m++;
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} else if (properties->values[i] != NULL && properties->values[i]->type == JSON_NUMBER) {
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metatype[m] = VT_NUMBER;
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metaval[m] = properties->values[i]->string;
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m++;
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} else if (properties->values[i] != NULL && (properties->values[i]->type == JSON_TRUE || properties->values[i]->type == JSON_FALSE)) {
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metatype[m] = VT_BOOLEAN;
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metaval[m] = properties->values[i]->string;
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m++;
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} else {
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fprintf(stderr, "%d: Unsupported meta type\n", jp->line);
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goto next_feature;
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}
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}
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}
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serialize_int(out, m, &fpos);
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for (i = 0; i < m; i++) {
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serialize_int(out, metatype[i], &fpos);
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serialize_string(out, metakey[i], &fpos);
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serialize_string(out, metaval[i], &fpos);
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}
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unsigned bbox[] = { UINT_MAX, UINT_MAX, 0, 0 };
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serialize_int(out, t, &fpos);
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parse_geometry(t, coordinates, bbox, &fpos, out, VT_MOVETO);
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serialize_int(out, VT_END, &fpos);
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printf("bbox %x %x %x %x\n", bbox[0], bbox[1], bbox[2], bbox[3]);
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}
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next_feature:
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json_free(j);
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/* XXX check for any non-features in the outer object */
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}
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json_end(jp);
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}
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int main(int argc, char **argv) {
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if (argc > 1) {
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int i;
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for (i = 1; i < argc; i++) {
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FILE *f = fopen(argv[i], "r");
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if (f == NULL) {
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fprintf(stderr, "%s: %s: %s\n", argv[0], argv[i], strerror(errno));
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} else {
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read_json(f);
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fclose(f);
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}
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}
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} else {
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read_json(stdin);
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}
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return 0;
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}
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