INTERFACE PZWindow;

(* A PZWindow.T is a rectangle on the plotting plane. *)
(* Last edited on 2001-11-11 12:42:13 by stolfi *)

IMPORT Rd;
IMPORT PSPlot;
FROM PZTypes IMPORT LONG;

TYPE 
  T = ARRAY Axis OF Range;

  Axis = PSPlot.Axis;

  Range = PSPlot.Range;

PROCEDURE Join(READONLY b1, b2: T): T;
  (*
    The smallest bounding box that contains "b1" and "b2". *)

PROCEDURE Expand(READONLY b: T; rel: LONG): T;
  (*
    Enlarges "b" on all four sides by "rel" times its maximum extent. *)

PROCEDURE Read(rd: Rd.T): T;
  (*
     Reads a window from "rd". *)
     
END PZWindow.