box2df_union_edge()

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

static

Definition at line 255 of file gserialized_gist_2d.c.

References box2df_edge(), and box2df_to_string().

Referenced by gserialized_gist_penalty_2d().

{
        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 )
                return box2df_edge(b);

        if ( b == NULL )
                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;
}

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