imagecolorexactalpha.xml

<?xml version="1.0" encoding="utf-8"?>
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<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>
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