#ifndef pz_window_H
#define pz_window_H

/* A pz_window_t is a box (axis-aligned rectangle) on the plotting plane. */
/* Last edited on 2008-02-08 11:32:49 by stolfi */

#include <pz_types.h>
#include <ia.h>
#include <interval.h>

typedef
   struct pz_window_t { interval_t r[2]; } pz_window_t;

bool_t pz_window_is_empty ( pz_window_t *w );
  /*
    TRUE if {w} is empty or reduces to a single point. */

pz_window_t pz_window_join ( pz_window_t *w1, pz_window_t *w2 );
  /*
    The smallest box that contains {w1} and {w2}. */

pz_window_t pz_window_expand ( pz_window_t *w, double rel );
  /*
    Enlarges {w} on all four sides by {rel} times its maximum extent. */

pz_window_t pz_window_read( FILE *rd );
  /*
     Reads a window from {rd}. */

#endif