<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.7 $ -->
<refentry xml:id="function.swf-lookat" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>swf_lookat</refname>
  <refpurpose>Define a viewing transformation</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>void</type><methodname>swf_lookat</methodname>
   <methodparam><type>float</type><parameter>view_x</parameter></methodparam>
   <methodparam><type>float</type><parameter>view_y</parameter></methodparam>
   <methodparam><type>float</type><parameter>view_z</parameter></methodparam>
   <methodparam><type>float</type><parameter>reference_x</parameter></methodparam>
   <methodparam><type>float</type><parameter>reference_y</parameter></methodparam>
   <methodparam><type>float</type><parameter>reference_z</parameter></methodparam>
   <methodparam><type>float</type><parameter>twist</parameter></methodparam>
  </methodsynopsis>
  <para>
   Defines a viewing transformation by giving the viewing position and the
   coordinates of a reference point in the scene.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>view_x</parameter></term>
     <listitem>
      <para>
       x-coordinate for the viewing position
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>view_y</parameter></term>
     <listitem>
      <para>
       y-coordinate for the viewing position
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>view_z</parameter></term>
     <listitem>
      <para>
       z-coordinate for the viewing position
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>reference_x</parameter></term>
     <listitem>
      <para>
       x-coordinate for the reference point
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>reference_y</parameter></term>
     <listitem>
      <para>
       y-coordinate for the reference point
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>reference_z</parameter></term>
     <listitem>
      <para>
       z-coordinate for the reference point
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>twist</parameter></term>
     <listitem>
      <para>
       Controls the rotation along with viewer's z axis.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.void;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>A simple 3D-rotation around a text</title>
    <programlisting role="php">
<![CDATA[
<?php

header('Content-type: application/x-shockwave-flash');

swf_openfile("php://stdout", 320, 200, 25, 1, 1, 1);

swf_ortho(-100, 100, -100, 100, -100, 100); // create 3D coordinates

swf_definefont(0, "Pix3");
swf_addcolor(0, 0, 0, 1);
swf_fontsize(10);
swf_fonttracking(0.2);

for ($i = 0; $i < 628; $i += 8) {
    $j = $i / 100;
    swf_pushmatrix();
    swf_translate(0, 0, 0);
    swf_perspective(100, 1, 0, 10);
    swf_lookat(sin($j) * 60, 50, cos($j) * 60, 0, 0, 0, 0);

    swf_definetext (1, 'HotKey@', 0);
    swf_translate(-50,0,0);

    swf_placeobject(1,10);

    swf_definetext(2, 'example.com', 0);
    swf_translate(55, 0, 0);
    swf_placeobject(2, 11);

    swf_showframe();
    swf_removeobject(10);
    swf_removeobject(11);
    swf_popmatrix();
}

swf_closefile();
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

</refentry>

<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"../../../../manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->