mirror of
https://github.com/sigmasternchen/php-doc-en
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115 lines
3.1 KiB
XML
115 lines
3.1 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.imagealphablending" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>imagealphablending</refname>
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<refpurpose>Set the blending mode for an image</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>imagealphablending</methodname>
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<methodparam><type>GdImage</type><parameter>image</parameter></methodparam>
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<methodparam><type>bool</type><parameter>enable</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>imagealphablending</function> allows for two different
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modes of drawing on truecolor images. In blending mode, the
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alpha channel component of the color supplied to all drawing function,
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such as <function>imagesetpixel</function> determines how much of the
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underlying color should be allowed to shine through. As a result, gd
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automatically blends the existing color at that point with the drawing color,
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and stores the result in the image. The resulting pixel is opaque. In
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non-blending mode, the drawing color is copied literally with its alpha channel
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information, replacing the destination pixel. Blending mode is not available
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when drawing on palette images.
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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>enable</parameter></term>
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<listitem>
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<para>
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Whether to enable the blending mode or not. On true color images
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the default value is &true; otherwise the default value is &false;
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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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&gd.changelog.image-param;
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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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<example>
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<title><function>imagealphablending</function> usage example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Create image
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$im = imagecreatetruecolor(100, 100);
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// Set alphablending to on
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imagealphablending($im, true);
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// Draw a square
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imagefilledrectangle($im, 30, 30, 70, 70, imagecolorallocate($im, 255, 0, 0));
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// Output
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header('Content-Type: image/png');
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imagepng($im);
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imagedestroy($im);
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?>
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]]>
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</programlisting>
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</example>
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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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