box2df_union_edge()

static float box2df_union_edge ( const BOX2DF *  a, const BOX2DF *  b  )

static

Definition at line 280 of file gserialized_gist_2d.c.

{
        float result;
 
        POSTGIS_DEBUG(5,"entered function");
 
        if ( a == NULL && b == NULL )
        {
                elog(ERROR, "box2df_union_edge received two null arguments");
                return 0.0;
        }
 
        if ( a == NULL || box2df_is_empty(a) )
                return box2df_edge(b);
 
        if ( b == NULL || box2df_is_empty(b) )
                return box2df_edge(a);
 
        result = (Max(a->xmax,b->xmax) - Min(a->xmin,b->xmin)) +
                 (Max(a->ymax,b->ymax) - Min(a->ymin,b->ymin));
 
        POSTGIS_DEBUGF(5, "union edge of %s and %s is %.8g", box2df_to_string(a), box2df_to_string(b), result);
 
        return result;
}

References box2df_edge(), box2df_is_empty(), and box2df_to_string().

Referenced by gserialized_gist_penalty_2d().

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