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;;; pie.skb -- Pie charts.
;;;
;;; Copyright 2006 Ludovic Court�s <ludovic.courtes@laas.fr>
;;;
;;;
;;; This program 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 2 of the License, or
;;; (at your option) any later version.
;;;
;;; This program 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 this program; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
;;; USA.
;;; FIXME: This is a stub and must be completed!
(chapter :title [Pie Charts] :ident "pie-charts"
(p [Skribilo contains a pie-chart formatting package, located in the
,(tt [(skribilo package pie)]) module. It allows users to produces
represent numeric data as pie charts as in the following example:]
(disp (pie :title [Use of Document Formatting Systems]
:fingers? #t :labels 'outside
:initial-angle 90
:ident "pie-skribilo-rulez"
(slice :weight 10 :color "red" :detach? #t
(bold [Skribilo]))
(slice :weight 6 :color "green" "Skribe")
(slice :weight 6 :color "blue" "Lout")
(slice :weight 4 :color "lightgrey" "LaTeX")
(slice :weight 2 :color "yellow" "Docbook")
(slice :weight 1 :color "black" "others"))))
(p [A default implementation, which uses ,(ref :text [Ploticus] :url
"http://ploticus.sf.net") as an external program, is available for all
engines. There is also a specific implementation for the Lout engine
which relies on Lout's own pie-chart package. In the latter case, you
don't need to have Ploticus installed, but you need it in the former.])
(p [Currently it only supports slice-coloring, but support for
textures (particularly useful for black & white printouts) could be
added in the future.])
(section :title [Syntax]
(p [Let us start with a simple example:]
(example-produce
(example :legend "Example of a pie chart"
(prgm :file "src/pie1.skb"))
(disp (include "src/pie1.skb"))))
(p [This illustrates the three markups provided by the ,(tt [pie])
package, namely ,(tt [pie]), ,(tt [slice]), and ,(tt [sliceweight]).
This last markup returns the weight of the slice it is used in, be it as
a percentage or an absolute value. Note that the ,(tt [:total]) option
of ,(tt [pie]) can be used to create pie charts no entirely filled.])
(p [Various options allow the pie layout to be controlled:]
(example-produce
(example :legend "Specifying the layout of a pie chart"
(prgm :file "src/pie2.skb"))
(disp (include "src/pie2.skb"))))))
;;; arch-tag: 60382016-3a63-4466-83e0-46a259cb39ab
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