dbscan_update_context()

static int dbscan_update_context ( GEOSSTRtree *  tree, struct QueryContext *  cxt, LWGEOM **  geoms, uint32_t  p, double  eps  )

static

Definition at line 264 of file lwgeom_geos_cluster.c.

{
        cxt->num_items_found = 0;
 
        GEOSGeometry* query_envelope;
        if (geoms[p]->type == POINTTYPE)
        {
                const POINT2D* pt = getPoint2d_cp(lwgeom_as_lwpoint(geoms[p])->point, 0);
                query_envelope = make_geos_segment( pt->x - eps, pt->y - eps, pt->x + eps, pt->y + eps );
        } else {
                const GBOX* box = lwgeom_get_bbox(geoms[p]);
                query_envelope = make_geos_segment( box->xmin - eps, box->ymin - eps, box->xmax + eps, box->ymax + eps );
        }
 
        if (!query_envelope)
                return LW_FAILURE;
 
        GEOSSTRtree_query(tree, query_envelope, &query_accumulate, cxt);
 
        GEOSGeom_destroy(query_envelope);
 
        return LW_SUCCESS;
}

References getPoint2d_cp(), LW_FAILURE, LW_SUCCESS, lwgeom_as_lwpoint(), lwgeom_get_bbox(), make_geos_segment(), QueryContext::num_items_found, POINTTYPE, query_accumulate(), POINT2D::x, GBOX::xmax, GBOX::xmin, POINT2D::y, GBOX::ymax, and GBOX::ymin.

Referenced by union_dbscan_general(), and union_dbscan_minpoints_1().

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