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https://github.com/sigmasternchen/php-doc-en
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a5750a8f03
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@161074 c90b9560-bf6c-de11-be94-00142212c4b1
100 lines
3.1 KiB
XML
100 lines
3.1 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.6 $ -->
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<refentry id="function.imagecolorallocatealpha">
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<refnamediv>
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<refname>imagecolorallocatealpha</refname>
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<refpurpose>Allocate a color for an image</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>int</type><methodname>imagecolorallocatealpha</methodname>
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<methodparam><type>resource</type><parameter>image</parameter></methodparam>
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<methodparam><type>int</type><parameter>red</parameter></methodparam>
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<methodparam><type>int</type><parameter>green</parameter></methodparam>
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<methodparam><type>int</type><parameter>blue</parameter></methodparam>
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<methodparam><type>int</type><parameter>alpha</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>imagecolorallocatealpha</function> behaves identically to
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<function>imagecolorallocate</function> with the addition of the transparency
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parameter <parameter>alpha</parameter> which may have a value between
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<literal>0</literal> and <literal>127</literal>. <literal>0</literal>
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indicates completely opaque while <literal>127</literal> indicates
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completely transparent.
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</para>
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<para>
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Returns &false; if the allocation failed.
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</para>
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<para>
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<example>
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<title>Example of using <function>imagecolorallocatealpha</function></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$size = 300;
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$image=imagecreatetruecolor($size, $size);
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// something to get a white background with black border
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$back = imagecolorallocate($image, 255, 255, 255);
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$border = imagecolorallocate($image, 0, 0, 0);
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imagefilledrectangle($image, 0, 0, $size - 1, $size - 1, $back);
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imagerectangle($image, 0, 0, $size - 1, $size - 1, $border);
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$yellow_x = 100;
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$yellow_y = 75;
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$red_x = 120;
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$red_y = 165;
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$blue_x = 187;
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$blue_y = 125;
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$radius = 150;
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// allocate colors with alpha values
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$yellow = imagecolorallocatealpha($image, 255, 255, 0, 75);
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$red = imagecolorallocatealpha($image, 255, 0, 0, 75);
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$blue = imagecolorallocatealpha($image, 0, 0, 255, 75);
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// drawing 3 overlapped circle
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imagefilledellipse($image, $yellow_x, $yellow_y, $radius, $radius, $yellow);
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imagefilledellipse($image, $red_x, $red_y, $radius, $radius, $red);
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imagefilledellipse($image, $blue_x, $blue_y, $radius, $radius, $blue);
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// don't forget to output a correct header!
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header('Content-type: image/png');
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// and finally, output the result
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imagepng($image);
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imagedestroy($image);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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¬e.gd.2;
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<para>
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See also <function>imagecolorallocate</function> and
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<function>imagecolordeallocate</function>.
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</para>
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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:"../../../../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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