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Copy pathrelate.c
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141 lines (128 loc) · 4.23 KB
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/*
A simple utility for getting a "relate" result in JSON using the GEOS library.
$ cc -O3 -Ilibgeos/build/install/include -o relate relate.c \
libgeos/build/install/lib/libgeos_c.a \
libgeos/build/install/lib/libgeos.a -lm -pthread -lstdc++
$ ./relate <geom-a> <geom-b>
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <ctype.h>
#include <string.h>
#include <geos_c.h>
GEOSContextHandle_t handle;
static void geos_error(const char *message, void *userdata) {
fprintf(stderr, "error: %s\n", message);
}
char predicate0(GEOSGeometry *a, GEOSGeometry *b, const char *name) {
int res;
if (strcmp(name, "equals") == 0) {
res = GEOSEquals_r(handle, a, b);
} else if (strcmp(name, "intersects") == 0) {
res = GEOSIntersects_r(handle, a, b);
} else if (strcmp(name, "disjoint") == 0) {
res = GEOSDisjoint_r(handle, a, b);
} else if (strcmp(name, "contains") == 0) {
res = GEOSContains_r(handle, a, b);
} else if (strcmp(name, "within") == 0) {
res = GEOSWithin_r(handle, a, b);
} else if (strcmp(name, "covers") == 0) {
res = GEOSCovers_r(handle, a, b);
} else if (strcmp(name, "coveredby") == 0) {
res = GEOSCovers_r(handle, b, a);
} else if (strcmp(name, "crosses") == 0) {
res = GEOSCrosses_r(handle, a, b);
} else if (strcmp(name, "overlaps") == 0) {
res = GEOSOverlaps_r(handle, a, b);
} else if (strcmp(name, "touches") == 0) {
res = GEOSTouches_r(handle, a, b);
} else {
abort();
}
if (res == 0) {
return 'F';
}
if (res == 1) {
return 'T';
}
abort();
}
char *predicate(GEOSGeometry *a, GEOSGeometry *b, const char *name) {
char *out = malloc(128);
if (!out) abort();
char t1 = predicate0(a, b, name);
char t2 = predicate0(b, a, name);
snprintf(out, 128, "\"%s\": %.*s[\"%c\", \"%c\"]", name,
(int)(10-strlen(name)), " ", t1, t2);
return out;
}
bool isjson(const char *str) {
char *p = (char *)str;
while (*p) {
if (*p == '{') {
return true;
}
if (!isspace(*p)) {
break;
}
p++;
}
return false;
}
GEOSGeometry *read_json(const char *json) {
GEOSGeoJSONReader *reader = GEOSGeoJSONReader_create_r(handle);
GEOSGeometry *geom = GEOSGeoJSONReader_readGeometry_r(handle, reader, json);
return geom;
}
GEOSGeometry *read_wkt(const char *wkt) {
GEOSWKTReader *reader = GEOSWKTReader_create_r(handle);
GEOSGeometry *geom = GEOSWKTReader_read_r(handle, reader, wkt);
return geom;
}
int main(int argc, char **argv) {
if (argc < 3) {
fprintf(stderr, "usage: relate <geom-a> <geom-b>\n");
exit(1);
}
handle = GEOS_init_r();
GEOSContext_setErrorMessageHandler_r(handle, geos_error, 0);
bool ajson = isjson(argv[1]);
bool bjson = isjson(argv[2]);
GEOSGeometry *a = ajson ? read_json(argv[1]) : read_wkt(argv[1]);
GEOSGeometry *b = bjson ? read_json(argv[2]) : read_wkt(argv[2]);
if (!a || !b) exit(1);
char *ab = GEOSRelate_r(handle, a, b);
char *ba = GEOSRelate_r(handle, b, a);
if (!ab || !ba) abort();
int da = GEOSGeom_getDimensions(a);
int db = GEOSGeom_getDimensions(b);
printf("{\n");
printf(" \"geoms\": [\n");
if (ajson) {
printf(" %s,\n",argv[1]);
} else {
printf(" \"%s\",\n",argv[1]);
}
if (bjson) {
printf(" %s\n", argv[2]);
} else {
printf(" \"%s\"\n",argv[2]);
}
printf(" ],\n");
printf(" \"dims\": [ %d, %d ],\n", da, db);
printf(" \"relate\": [ \"%s\", \"%s\" ],\n", ab, ba);
printf(" \"predicates\": {\n");
printf(" %s,\n", predicate(a, b, "equals"));
printf(" %s,\n", predicate(a, b, "intersects"));
printf(" %s,\n", predicate(a, b, "disjoint"));
printf(" %s,\n", predicate(a, b, "contains"));
printf(" %s,\n", predicate(a, b, "within"));
printf(" %s,\n", predicate(a, b, "covers"));
printf(" %s,\n", predicate(a, b, "coveredby"));
printf(" %s,\n", predicate(a, b, "crosses"));
printf(" %s,\n", predicate(a, b, "overlaps"));
printf(" %s\n", predicate(a, b, "touches"));
printf(" }\n");
printf("}\n");
}