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;;; pie.skb -- Pie charts.
;;;
;;; Copyright 2006, 2009 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]
:info-node [Pie 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"))))
(p [The available markups and their options are described below.])
(doc-markup 'pie
`((:title ,[The title of the pie chart.])
(:initial-angle ,[The initial angle of the pie, in degrees.])
(:total ,[If a number, specifies the
"weight" of the whole pie; in this case, if the pie's slices don't add
up to that number, then part of the pie is shown as empty. If ,(code
[#f]), the total that is used is the sum of the weight of each slice.])
(:radius ,[The pie's radius. How this value
is interpreted depends on the engine used.])
(:fingers? ,[Indicates whether to add "fingers"
(arrows) from labels to slices when labels are outside of slices.])
(:labels ,[A symbol indicating where slice
labels are rendered: ,(code [outside]) to have them appear outside of
the pie, ,(code [inside]) to have them appear inside the pie, and ,(code
[legend]) to have them appear in a separate legend.]))
:source "skribilo/package/pie.scm"
:see-also '(slice))
(doc-markup 'slice
`((#!rest label ,[The label of the node. It can
contain arbitrary markup, notably instances of ,(markup-ref
"sliceweight"). However, some engines, such as the Ploticus-based
rendering, are not able to render markup other than ,(markup-ref
"sliceweight"); consequently, they render the label as though it were
markup-free.])
(:weight ,[An integer indicating the weight of this
slice.])
(:color ,[The background color of the slice.])
(:detach? ,[Indicates whether the slice should be
detached from the pie.]))
:source "skribilo/package/pie.scm"
:see-also '(pie sliceweight))
(p [As seen in the examples above, the body of a ,(markup-ref
"slice") markup can contain instances of ,(markup-ref "sliceweight") to
represent the weight of the slice:])
(doc-markup 'sliceweight
`((:percentage? ,[Indicates whether the slice's weight
should be shown as a percentage of the total pie weight or as a raw
weight.]))
:see-also '(slice)
:source "skribilo/package/pie.scm")))
;; Local Variables:
;; coding: latin-1
;; ispell-local-dictionary: "american"
;; End:
|
