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https://github.com/sigmasternchen/php-doc-en
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c030e2adf7
- All id attributes are now xml:id - Add docbook namespace to all root elements - Replace <ulink /> with <link xlink:href /> - Minor markup fixes here and there git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@238160 c90b9560-bf6c-de11-be94-00142212c4b1
148 lines
4 KiB
XML
148 lines
4 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.11 $ -->
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<refentry xml:id="function.imageline" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>imageline</refname>
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<refpurpose>Draw a line</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>imageline</methodname>
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<methodparam><type>resource</type><parameter>image</parameter></methodparam>
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<methodparam><type>int</type><parameter>x1</parameter></methodparam>
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<methodparam><type>int</type><parameter>y1</parameter></methodparam>
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<methodparam><type>int</type><parameter>x2</parameter></methodparam>
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<methodparam><type>int</type><parameter>y2</parameter></methodparam>
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<methodparam><type>int</type><parameter>color</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>imageline</function> draws a line between the two given points.
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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>x1</parameter></term>
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<listitem>
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<para>
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x-coordinate for first point
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>y1</parameter></term>
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<listitem>
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<para>
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y-coordinate for first point
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>x2</parameter></term>
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<listitem>
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<para>
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x-coordinate for second point
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>y2</parameter></term>
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<listitem>
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<para>
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y-coordinate for second point
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>color</parameter></term>
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<listitem>
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<para>
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The line color. A color identifier created with
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<function>imagecolorallocate</function>
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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="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Drawing a thick line</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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function imagelinethick($image, $x1, $y1, $x2, $y2, $color, $thick = 1)
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{
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/* this way it works well only for orthogonal lines
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imagesetthickness($image, $thick);
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return imageline($image, $x1, $y1, $x2, $y2, $color);
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*/
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if ($thick == 1) {
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return imageline($image, $x1, $y1, $x2, $y2, $color);
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}
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$t = $thick / 2 - 0.5;
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if ($x1 == $x2 || $y1 == $y2) {
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return imagefilledrectangle($image, round(min($x1, $x2) - $t), round(min($y1, $y2) - $t), round(max($x1, $x2) + $t), round(max($y1, $y2) + $t), $color);
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}
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$k = ($y2 - $y1) / ($x2 - $x1); //y = kx + q
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$a = $t / sqrt(1 + pow($k, 2));
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$points = array(
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round($x1 - (1+$k)*$a), round($y1 + (1-$k)*$a),
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round($x1 - (1-$k)*$a), round($y1 - (1+$k)*$a),
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round($x2 + (1+$k)*$a), round($y2 - (1-$k)*$a),
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round($x2 + (1-$k)*$a), round($y2 + (1+$k)*$a),
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);
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imagefilledpolygon($image, $points, 4, $color);
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return imagepolygon($image, $points, 4, $color);
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}
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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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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>imagecreatetruecolor</function></member>
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<member><function>imagecolorallocate</function></member>
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</simplelist>
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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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