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imagecolorexactalpha.xml
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imagecolorexactalpha.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 593ea510e853ff034e03f78a4be0daa41661c9d4 Maintainer: HonestQiao Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<refentry xml:id="function.imagecolorexactalpha" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>imagecolorexactalpha</refname>
<refpurpose>取得指定的颜色加透明度的索引值</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>imagecolorexactalpha</methodname>
<methodparam><type>GdImage</type><parameter>image</parameter></methodparam>
<methodparam><type>int</type><parameter>red</parameter></methodparam>
<methodparam><type>int</type><parameter>green</parameter></methodparam>
<methodparam><type>int</type><parameter>blue</parameter></methodparam>
<methodparam><type>int</type><parameter>alpha</parameter></methodparam>
</methodsynopsis>
<para>
返回图像调色板中指定颜色加透明度的索引值。
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&gd.image.description;
<varlistentry>
<term><parameter>red</parameter></term>
<listitem>
<para>&gd.value.red;</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>green</parameter></term>
<listitem>
<para>&gd.value.green;</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>blue</parameter></term>
<listitem>
<para>&gd.value.blue;</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>alpha</parameter></term>
<listitem>
<para>
介于 <literal>0</literal> 和 <literal>127</literal> 之间的值。<literal>0</literal>
表示完全不透明,而 <literal>127</literal> 表示完全透明。
</para>
</listitem>
</varlistentry>
</variablelist>
colors 参数是 0 到 255 之间的整数或 0x00 到 0xFF 之间的十六进制数。
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
返回图像调色板中指定颜色加透明度的索引值。
如果颜色不在图像的调色板中,返回 -1。
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&gd.changelog.image-param;
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title>从 GD logo 中获取颜色</title>
<programlisting role="php">
<![CDATA[
<?php
// Setup an image
$im = imagecreatefrompng('./gdlogo.png');
$colors = Array();
$colors[] = imagecolorexactalpha($im, 255, 0, 0, 0);
$colors[] = imagecolorexactalpha($im, 0, 0, 0, 127);
$colors[] = imagecolorexactalpha($im, 255, 255, 255, 55);
$colors[] = imagecolorexactalpha($im, 100, 255, 52, 20);
print_r($colors);
// Free from memory
imagedestroy($im);
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
Array
(
[0] => 16711680
[1] => 2130706432
[2] => 939524095
[3] => 342163252
)
]]>
</screen>
</example>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<simplelist>
<member><function>imagecolorclosestalpha</function></member>
</simplelist>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->