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;;; lout.scm -- Lout implementation of the `pie' package.
;;;
;;; Copyright 2005, 2006, 2007, 2009 Ludovic Court�s <ludo@gnu.org>
;;;
;;;
;;; This file is part of Skribilo.
;;;
;;; Skribilo is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; Skribilo 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 General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Skribilo. If not, see <http://www.gnu.org/licenses/>.
(define-module (skribilo package pie lout)
:use-module (skribilo package pie)
:use-module (skribilo ast)
:autoload (skribilo output) (output)
:use-module (skribilo writer)
:use-module (skribilo engine)
:use-module (skribilo lib)
:use-module (skribilo utils syntax)
:autoload (skribilo engine lout) (lout-color-specification))
(skribilo-module-syntax)
;;;
;;; Helper functions.
;;;
(let ((lout (find-engine 'lout)))
(if lout
(engine-custom-set! lout 'includes
(string-append (engine-custom lout 'includes)
"\n@SysInclude { pie } # Pie Charts\n"))))
;;;
;;; Writers.
;;;
(markup-writer 'pie (find-engine 'lout)
:options '(:title :initial-angle :total :radius :labels :fingers?)
:before (lambda (node engine)
(let* ((weights (map (lambda (slice)
(markup-option slice :weight))
(markup-body node)))
(total-weight (or (if (number? (markup-option node
:total))
(markup-option node :total)
#f)
(apply + weights))))
(if (= 0 total-weight)
(skribe-error 'lout
"Slices weight sum should not be zero"
total-weight))
;; Attach useful information to the pie and its slices
(markup-option-add! node '&total-weight total-weight)
(display "\n@Pie\n")
(display " abovecaption { ")
(if (markup-option node :title)
(output (markup-option node :title) engine))
(display " }\n")
(format #t " totalweight { ~a }\n" total-weight)
(format #t " initialangle { ~a }\n"
(or (markup-option node :initial-angle) 0))
(format #t " finger { ~a }\n"
(case (markup-option node :labels)
((outside) (if (markup-option node :fingers?)
"yes" "no"))
(else "no")))
;; We assume `:radius' to be centimeters
(if (markup-option node :radius)
(format #t " radius { ~ac }\n"
(markup-option node :radius)))
(format #t " labelradius { ~a }\n"
(case (markup-option node :labels)
((outside #f) "external") ; FIXME: options are
; not availble within
; :before? (hence the #f)
((inside) "internal")
(else
(skribe-error 'lout
"`:labels' should be one of 'inside or 'outside."
(markup-option node :labels)))))
(display "{\n")))
:after "\n} # @Pie\n")
(markup-writer 'slice (find-engine 'lout)
:options '(:weight :detach? :color)
:action (lambda (node engine)
(display " @Slice\n")
(format #t " detach { ~a }\n"
(if (markup-option node :detach?)
"yes"
"no"))
(format #t " paint { ~a }\n"
(lout-color-specification (markup-option node
:color)))
(format #t " weight { ~a }\n"
(markup-option node :weight))
(display " label { ")
(output (markup-body node) engine)
(display " }\n")))
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