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Project to web mercator and calculate bounding box

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This commit is contained in:
Eric Fischer 2014-09-16 11:16:51 -07:00
parent ff5b632cf5
commit 33747bdfd8
1 changed files with 26 additions and 3 deletions
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29
geojson.c
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@ -10,6 +10,7 @@
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include "jsonpull.h"
#define GEOM_POINT 0 /* array of positions */
@ -65,7 +66,7 @@ void latlon2tile(double lat, double lon, int zoom, unsigned int *x, unsigned int
*y = n * (1 - (log(tan(lat_rad) + 1/cos(lat_rad)) / M_PI)) / 2;
}
void parse_geometry(int t, json_object *j) {
void parse_geometry(int t, json_object *j, unsigned *bbox) {
if (j == NULL || j->type != JSON_ARRAY) {
fprintf(stderr, "expected array for type %d\n", t);
return;
@ -84,11 +85,29 @@ void parse_geometry(int t, json_object *j) {
}
}
parse_geometry(within, j->array[i]);
parse_geometry(within, j->array[i], bbox);
}
printf("]");
} else {
if (j->length == 2 && j->array[0]->type == JSON_NUMBER && j->array[1]->type == JSON_NUMBER) {
unsigned x, y;
double lon = j->array[0]->number;
double lat = j->array[1]->number;
latlon2tile(lat, lon, 32, &x, &y);
if (x < bbox[0]) {
bbox[0] = x;
}
if (y < bbox[1]) {
bbox[1] = y;
}
if (x > bbox[2]) {
bbox[2] = x;
}
if (y > bbox[3]) {
bbox[3] = y;
}
printf(" %f,%f ", j->array[0]->number, j->array[1]->number);
} else {
fprintf(stderr, "malformed point");
@ -185,9 +204,13 @@ void read_json(FILE *f) {
}
}
unsigned bbox[] = { UINT_MAX, UINT_MAX, 0, 0 };
printf("%d: ", mb_geometry[t]);
parse_geometry(t, coordinates);
parse_geometry(t, coordinates, bbox);
printf("\n");
printf("bbox %x %x %x %x\n", bbox[0], bbox[1], bbox[2], bbox[3]);
}
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