#lang scheme/base
;;; PLT Scheme Science Collection
;;; discrete-histogram-graphics.ss
;;; Copyright (c) 2004-2008 M. Douglas Williams
;;;
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public
;;; License as published by the Free Software Foundation; either
;;; version 2.1 of the License, or (at your option) any later version.
;;;
;;; This library is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this library; if not, write to the Free
;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
;;; 02111-1307 USA.
;;;
;;; -------------------------------------------------------------------
;;;
;;; This module implements the graphics for discrete histograms.
;;;
;;; Version  Date      Description
;;; 1.0.0    09/30/04  Marked as ready for Release 1.0.  (Doug
;;;                    Williams)
;;; 3.0.0    06/09/08  Changes required for V4.0  (Doug Williams)

(require "discrete-histogram.ss"
         (lib "plot.ss" "plot")
         "plot-discrete.ss"
         (lib "contract.ss"))

(provide/contract
 (discrete-histogram-plot
  (case-> (-> discrete-histogram? string? any)
          (-> discrete-histogram? any)))
 (discrete-histogram-plot-scaled
  (case-> (-> discrete-histogram? string? any)
          (-> discrete-histogram? any))))

;;; discrete-histogram-plot: discrete-histogram x string -> void
;;;                          discrete-histogram -> void
(define discrete-histogram-plot
  (case-lambda
    ((h title)
     (let ((n1 (discrete-histogram-n1 h))
           (n2 (discrete-histogram-n2 h))
           (bins (discrete-histogram-bins h)))
       (plot (discrete `(,n1 ,n2 ,bins))
             (x-min (- n1 0.5)) (x-max (+ n2 0.5))
             (y-min 0) (y-max (discrete-histogram-max h))
             (y-label "Count")
             (title title))))
    ((h)
     (discrete-histogram-plot h "Histogram"))))

;;; discrete-histogram-plot-scaled: discrete-histogram x string -> void
;;;                                 discrete-histogram -> void
(define discrete-histogram-plot-scaled
  (case-lambda
    ((h title)
     (let ((n1 (discrete-histogram-n1 h))
           (n2 (discrete-histogram-n2 h))
           (bins (discrete-histogram-bins h)))
       (plot (discrete `(,n1 ,n2 ,bins))
             (x-min (- n1 0.5)) (x-max (+ n2 0.5))
             (y-min 0) (y-max (discrete-histogram-sum h))
             (y-label "Count")
             (title title))))
    ((h)
     (discrete-histogram-plot h "Histogram"))))