#lang racket
;;; Science Collection
;;; discrete-histogram-graphics.rkt
;;; Copyright (c) 2004-2011 M. Douglas Williams
;;;
;;; This file is part of the Science Collection.
;;;
;;; The Science Collection 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 3 of the License
;;; or (at your option) any later version.
;;;
;;; The Science Collection is distributed in the hope that it will be useful,
;;; but WITHOUT 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 the Science Collection.  If not, see
;;; <http://www.gnu.org/licenses/>.
;;;
;;; -----------------------------------------------------------------------------
;;;
;;; This module implements the graphics for discrete histograms.
;;;
;;; Version  Date      Description
;;; 1.0.0    09/30/04  Marked as ready for Release 1.0. (MDW)
;;; 3.0.0    06/09/08  Changes required for V4.0 (MDW)
;;; 3.0.1    07/01/08  Changed x axis label. (MDW)
;;; 4.0.0    07/03/10  Changed the header and restructured the code. (MDW)

(require "discrete-histogram.rkt"
         "plot-discrete.ss"
         plot)

;;; 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)
             #:x-label "X"
             #: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)
             #:x-label "X"
             #:y-min 0 #:y-max (discrete-histogram-sum h)
             #:y-label "Count"
             #:title title)))
    ((h)
     (discrete-histogram-plot h "Histogram"))))

;;; Module Contracts

(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))))