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Shrink the geometry by shaving off bits below the maxzoom tile resolution

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This commit is contained in:
Eric Fischer
2015-06-18 14:16:16 -07:00
parent a1d3ecf9bb
commit a185073f0a
4 changed files with 12 additions and 7 deletions
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geojson.c
+7 -3
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@@ -26,6 +26,7 @@ int full_detail = -1;
int min_detail = 7;
unsigned initial_x = 0, initial_y = 0;
int geometry_scale = 0;
int initialized = 0;
#define GEOM_POINT 0 /* array of positions */
@@ -164,8 +165,8 @@ void parse_geometry(int t, json_object *j, unsigned *bbox, long long *fpos, FILE
}
serialize_byte(out, op, fpos, fname);
serialize_long_long(out, x - *wx, fpos, fname);
serialize_long_long(out, y - *wy, fpos, fname);
serialize_long_long(out, (x >> geometry_scale) - (*wx >> geometry_scale), fpos, fname);
serialize_long_long(out, (y >> geometry_scale) - (*wy >> geometry_scale), fpos, fname);
*wx = x;
*wy = y;
} else {
@@ -494,7 +495,7 @@ int read_json(int argc, char **argv, char *fname, const char *layername, int max
long long indexpos = 0;
unlink(metaname);
unlink(poolname);
//unlink(poolname);
unlink(geomname);
unlink(indexname);
@@ -1182,6 +1183,9 @@ int main(int argc, char **argv) {
exit(EXIT_FAILURE);
}
geometry_scale = 32 - (full_detail + maxzoom);
printf("geometry scale is %d\n", geometry_scale);
if (outdir == NULL) {
fprintf(stderr, "%s: must specify -o out.mbtiles\n", argv[0]);
exit(EXIT_FAILURE);