box2df_distance()

static double box2df_distance ( const BOX2DF *  a, const BOX2DF *  b  )

static

Calculate the box->box distance.

Definition at line 533 of file gserialized_gist_2d.c.

References box2df_above(), box2df_below(), box2df_left(), box2df_overlaps(), box2df_right(), and pt_distance().

Referenced by gserialized_distance_box_2d(), and gserialized_gist_distance_2d().

{
        /* Check for overlap */
        if ( box2df_overlaps(a, b) )
                return 0.0;

        if ( box2df_left(a, b) )
        {
                if ( box2df_above(a, b) )
                        return pt_distance(a->xmax, a->ymin, b->xmin, b->ymax);
                if ( box2df_below(a, b) )
                        return pt_distance(a->xmax, a->ymax, b->xmin, b->ymin);
                else
                        return (double)b->xmin - (double)a->xmax;
        }
        if ( box2df_right(a, b) )
        {
                if ( box2df_above(a, b) )
                        return pt_distance(a->xmin, a->ymin, b->xmax, b->ymax);
                if ( box2df_below(a, b) )
                        return pt_distance(a->xmin, a->ymax, b->xmax, b->ymin);
                else
                        return (double)a->xmin - (double)b->xmax;
        }
        if ( box2df_above(a, b) )
        {
                if ( box2df_left(a, b) )
                        return pt_distance(a->xmax, a->ymin, b->xmin, b->ymax);
                if ( box2df_right(a, b) )
                        return pt_distance(a->xmin, a->ymin, b->xmax, b->ymax);
                else
                        return (double)a->ymin - (double)b->ymax;
        }
        if ( box2df_below(a, b) )
        {
                if ( box2df_left(a, b) )
                        return pt_distance(a->xmax, a->ymax, b->xmin, b->ymin);
                if ( box2df_right(a, b) )
                        return pt_distance(a->xmin, a->ymax, b->xmax, b->ymin);
                else
                        return (double)b->ymin - (double)a->ymax;
        }

        return FLT_MAX;
}

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