php-doc-en/reference/image/functions/imagepolygon.xml

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  <refentry id="function.imagepolygon">
   <refnamediv>
    <refname>imagepolygon</refname>
    <refpurpose>Draw a polygon</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>imagepolygon</methodname>
      <methodparam><type>resource</type><parameter>image</parameter></methodparam>
      <methodparam><type>array</type><parameter>points</parameter></methodparam>
      <methodparam><type>int</type><parameter>num_points</parameter></methodparam>
      <methodparam><type>int</type><parameter>color</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>imagepolygon</function> creates a polygon in image id.
     <parameter>points</parameter> is a PHP array containing the
     polygon's vertices, i.e. points[0] = x0, points[1] = y0, points[2]
     = x1, points[3] = y1, etc.  <parameter>num_points</parameter> is
     the total number of points (vertices).
    </para>
    <para>
     <example>
      <title><function>imagepolygon</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
// create a blank image
$image = imagecreatetruecolor(400, 300);

// fill the background color
$bg = imagecolorallocate($image, 0, 0, 0);

// choose a color for the polygon
$col_poly = imagecolorallocate($image, 255, 255, 255);

// draw the polygon
imagepolygon($image, 
             array (
                    0, 0,
                    100, 200,
                    300, 200
             ),
             3,
             $col_poly);

// output the picture
header("Content-type: image/png");
imagepng($image);

?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     See also <function>imagecreate</function> and
     <function>imagecreatetruecolor</function>.
    </para>
   </refsect1>
  </refentry>

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