Function geoAppendIfWithinShape

src/geo.cpp:217–241

Helper function for geoGetPointsInRange(): given a sorted set score * representing a point, and a GeoShape, appends this entry as a geoPoint * into the specified geoArray only if the point is within the search area. * * returns C_OK if the point is included, or REIDS_ERR if it is outside. */

 *
 * returns C_OK if the point is included, or REIDS_ERR if it is outside. */
int geoAppendIfWithinShape(geoArray *ga, GeoShape *shape, double score, sds member) {
    double distance = 0, xy[2];

    if (!decodeGeohash(score,xy)) return C_ERR; /* Can't decode. */
    /* Note that geohashGetDistanceIfInRadiusWGS84() takes arguments in
     * reverse order: longitude first, latitude later. */
    if (shape->type == CIRCULAR_TYPE) {
        if (!geohashGetDistanceIfInRadiusWGS84(shape->xy[0], shape->xy[1], xy[0], xy[1],
                                               shape->t.radius*shape->conversion, &distance)) return C_ERR;
    } else if (shape->type == RECTANGLE_TYPE) {
        if (!geohashGetDistanceIfInRectangle(shape->t.r.width * shape->conversion,
                                             shape->t.r.height * shape->conversion,
                                             shape->xy[0], shape->xy[1], xy[0], xy[1], &distance))
            return C_ERR;
    }

    /* Append the new element. */
    geoPoint *gp = geoArrayAppend(ga);
    gp->longitude = xy[0];
    gp->latitude = xy[1];
    gp->dist = distance;
    gp->member = member;
    gp->score = score;
    return C_OK;
}

/* Query a Redis sorted set to extract all the elements between 'min' and
 * 'max', appending them into the array of geoPoint structures 'gparray'.