mirror of
https://github.com/sigmasternchen/php-doc-en
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f85d380904
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@350828 c90b9560-bf6c-de11-be94-00142212c4b1
150 lines
3.9 KiB
XML
150 lines
3.9 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.imageantialias" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>imageantialias</refname>
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<refpurpose>Should antialias functions be used or not</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>imageantialias</methodname>
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<methodparam><type>resource</type><parameter>image</parameter></methodparam>
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<methodparam><type>bool</type><parameter>enabled</parameter></methodparam>
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</methodsynopsis>
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<para>
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Activate the fast drawing antialiased methods for lines and wired polygons.
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It does not support alpha components. It works using a direct blend
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operation. It works only with truecolor images.
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</para>
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<para>
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Thickness and styled are not supported.
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</para>
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<para>
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Using antialiased primitives with transparent background color can end with
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some unexpected results. The blend method uses the background color as any
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other colors. The lack of alpha component support does not allow an alpha
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based antialiasing method.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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&gd.image.description;
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<varlistentry>
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<term><parameter>enabled</parameter></term>
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<listitem>
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<para>
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Whether to enable antialiasing or not.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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&return.success;
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</para>
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>7.2.0</entry>
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<entry>
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<function>imageantialias</function> is now generally available. Formerly
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it was only available if PHP was compiled with the bundled version of the
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GD library.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>A comparison of two lines, one with anti-aliasing switched on</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Setup an anti-aliased image and a normal image
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$aa = imagecreatetruecolor(400, 100);
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$normal = imagecreatetruecolor(200, 100);
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// Switch antialiasing on for one image
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imageantialias($aa, true);
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// Allocate colors
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$red = imagecolorallocate($normal, 255, 0, 0);
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$red_aa = imagecolorallocate($aa, 255, 0, 0);
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// Draw two lines, one with AA enabled
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imageline($normal, 0, 0, 200, 100, $red);
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imageline($aa, 0, 0, 200, 100, $red_aa);
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// Merge the two images side by side for output (AA: left, Normal: Right)
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imagecopymerge($aa, $normal, 200, 0, 0, 0, 200, 100, 100);
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// Output image
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header('Content-type: image/png');
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imagepng($aa);
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imagedestroy($aa);
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imagedestroy($normal);
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?>
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]]>
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</programlisting>
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&example.outputs.similar;
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<mediaobject>
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<alt>Output of example : A comparison of two lines, one with anti-aliasing switched on</alt>
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<imageobject>
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<imagedata fileref="en/reference/image/figures/imageantialias.png"/>
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</imageobject>
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</mediaobject>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<simplelist>
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<member><function>imagecreatetruecolor</function></member>
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</simplelist>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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