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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<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>
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