d72ac078
 Guillaume
Ajout graphe V1.1
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Character encoding</title><link rel="stylesheet" type="text/css" href="manual.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.0"><link rel="home" href="index.html" title="JpGraph Manual"><link rel="up" href="ch08.html" title="Chapter 8. Text and font handling"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Character encoding</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 8. Text and font handling</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="Character encoding"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sec1.character-encoding"></a>Character encoding</h2></div></div></div>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
<p>If you are not using Japanese, Chinese, Cyrillic , Greek or Hebrew
languages then this section can be safely skipped.</p>
</div><p>The core problem for the library is that it has no way of knowing in what
input encoding the string given to the library is using. Hence it is necessary to,
sometime, tell the library what input encoding is being used in order for the
library to do necessary character encoding conversion to generate UTF-8 (or UTF-16)
as needed to properly render the TTF fonts. The specific encoding options for each
major supported locale are explained below.</p>
<p>By default all JpGraph library files and examples are encoded in UTF-8</p>
<p>All defines mentioned below can be found in the file
"<code class="filename">jpgraph_ttf.inc.php</code>" </p>
<div class="sect2" title="Japanese encoding options"><div class="titlepage"><div><div><h3 class="title"><a name="id2500277"></a>Japanese encoding options</h3></div></div></div>
<p>There is only one possible option that can be specified.</p>
<p>
</p><div class="table"><a name="id2500290"></a><p class="title"><b>Table 8.4. Japanese encoding options</b></p><div class="table-contents">
<table summary="Japanese encoding options" border="1"><colgroup><col class="c1"><col class="c2"><col class="c3"></colgroup><thead><tr><th>Symbolic define</th><th>Possible values </th><th>Description</th></tr></thead><tbody><tr><td><code class="code">ASSUME_EUCJP_ENCODING</code></td><td>true/false</td><td>Assumes that Japanese text have been entered in EUC-JP
encoding. If this define is true then conversion from EUC-JP
to UTF8 is done automatically in the library using the
<code class="code">mbstring</code> module in PHP. Note that the
multibyte extension in PHP is not normally enabled.</td></tr></tbody></table>
</div></div><p><br class="table-break">
</p>
<p>Otherwise it is assumed that the input characters are encoded in UTF-8.
Remember that to show the Japanese character sets (Kanji, Hiragana and Katakana)
one of the Japanese font families (<code class="code">FF_MINCHO</code>,
<code class="code">FF_PMINCHO</code>, <code class="code">FF_GOTHIC</code> or <code class="code">FF_PGOTHIC</code>)
must be specified. </p>
<p>An example of using Japanese locale together with Windrose plots can be seen
in <a class="xref" href="ch21s03.html#sec.windrose-locale-compass" title="Localizing the default names for the compass directions">Localizing the default names for the compass directions</a>.</p>
</div>
<div class="sect2" title="Chinese encoding options"><div class="titlepage"><div><div><h3 class="title"><a name="id2500408"></a>Chinese encoding options</h3></div></div></div>
<p>There are no specific settings that control the encoding. The following rules
are used depending on the font is specified. </p>
<p>
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p>If the font is specified as <code class="code">FF_SIMSUN</code> the built-in
library conversion from GB2312 to UTF-8 will be used. This
translation table is stored in the file
<code class="filename">jpgraph_gb2312.inc.php</code>.</p>
</li><li class="listitem">
<p>If the font is specified as <code class="code">FF_CHINESE</code> then no
conversion is made since it is assumed that the input character
string is already in UTF-8 This only has the effect of changing the
font to the default Chinese font family.</p>
</li><li class="listitem">
<p>If the font is specified as <code class="code">FF_BIG5</code> then it is
assumed that the input character string is encoded in BIG5 and the
internal translation to UTF-8 is done by the <code class="code">iconv()</code>
function. This means that PHP must be built with
<code class="code">iconv()</code> support. By default this is not compiled
into PHP (needs the "<code class="code">--width-iconv</code>" when configured).
For more on building PHP with the right options see <a class="xref" href="api.html" title="Appendix I. Compiling PHP">Appendix I. <i>Compiling PHP</i></a>. If this method is not present
the library will generate the following an error message.</p>
</li></ol></div><p>
</p>
<p>An example of using Chinese encoding with Windrose plots can be seen in <a class="xref" href="ch21s03.html#fig.windrose_ex6.1" title="Figure 21.11. Using chinese fonts (windrose_ex6.1.php)">Figure 21.11. Using chinese fonts <code class="uri"><a class="uri" href="example_src/windrose_ex6.1.html" target="_top">(<code class="filename">windrose_ex6.1.php</code>)</a></code> </a>
</p>
</div>
<div class="sect2" title="Cyrillic encoding options"><div class="titlepage"><div><div><h3 class="title"><a name="id2500502"></a>Cyrillic encoding options</h3></div></div></div>
<p>In order to do proper translation to unicode from cyrillic the
<code class="code">LANGUAGE_CYRILLIC</code> define should be set to true. If you are
running the library in multiuser environment it might be necessary to also
adjust the <code class="code">LANGUGAE_CHARSET</code> define as described below.</p>
<p>
</p><div class="table"><a name="id2500523"></a><p class="title"><b>Table 8.5. Cyrillic encoding options</b></p><div class="table-contents">
<table summary="Cyrillic encoding options" border="1"><colgroup><col class="c1"><col class="c2"><col class="c3"></colgroup><thead><tr><th>Symbolic define</th><th>Possible values </th><th>Description</th></tr></thead><tbody><tr><td><code class="code">LANGUAGE_CYRILLIC</code></td><td>true/false</td><td>
<p>Special unicode cyrillic language support</p>
</td></tr><tr><td><code class="code">CYRILLIC_FROM_WINDOWS</code></td><td>true/false</td><td>
<p>If you are setting this config to true the conversion
will assume that the input text is encoded in windows
1251, if false it will assume koi8-r</p>
</td></tr><tr><td><code class="code">LANGUAGE_CHARSET</code></td><td>string</td><td>
<p>This constant is used to auto-detect whether cyrillic
conversion is really necessary if enabled. Just specify
the encoding used, e.g. 'windows-1251', with a variable
containing the input character encoding string of your
application calling JpGraph. </p>
<p>A typical such string would be 'UTF-8' or 'utf-8'. The
comparison is case-insensitive. If this charset is not a
'koi8-r' or 'windows-1251' derivate then no conversion
is done. This constant can be very important in
multi-user multi-language environments where a cyrillic
conversion could be needed for some cyrillic people and
resulting in just erroneous conversions for non cyrillic
language based people. </p>
<p>Example: In the free project management software
dotproject.net <code class="code">$locale_char_set</code> is
dynamically set by the language environment the user has
chosen. </p>
<p>Usage: <code class="code">define('LANGUAGE_CHARSET',
$locale_char_set);</code> where
<code class="code">$locale_char_set</code> is a GLOBAL (string)
variable from the application including JpGraph.</p>
</td></tr></tbody></table>
</div></div><p><br class="table-break">
</p>
</div>
<div class="sect2" title="Hebrew encoding options"><div class="titlepage"><div><div><h3 class="title"><a name="id2500687"></a>Hebrew encoding options</h3></div></div></div>
<p>There are no user adjustable settings. The conversion is made from iso to
unicode with the help of the PHP method "<code class="code">hebrev()</code>" which is used to
convert logical Hebrew text to visual text. This conversion is done
automatically when the font is one of <code class="code">FF_DAVID</code>,
<code class="code">FF_MIRIAM</code> or <code class="code">FF_AHRON</code></p>
</div>
<div class="sect2" title="Greek encoding options"><div class="titlepage"><div><div><h3 class="title"><a name="id2500718"></a>Greek encoding options</h3></div></div></div>
<p>In order to do proper translation to unicode from greek the
<code class="code">LANGUAGE_GREEK</code> define should be specified to true.</p>
<p>
</p><div class="table"><a name="id2500733"></a><p class="title"><b>Table 8.6. Greek encoding options</b></p><div class="table-contents">
<table summary="Greek encoding options" border="1"><colgroup><col class="c1"><col class="c2"><col class="c3"></colgroup><thead><tr><th>Symbolic define</th><th>Possible values </th><th>Description</th></tr></thead><tbody><tr><td><code class="code">LANGUAGE_GREEK</code></td><td>true/false</td><td>Special unicode greek language support</td></tr><tr><td><code class="code">GREEK_FROM_WINDOWS</code></td><td>true/false</td><td>If you are setting this define to true the conversion of
greek characters will assume that the input text is windows
1251</td></tr></tbody></table>
</div></div><p><br class="table-break">
</p>
</div>
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