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<title>Define a viewing transformation</title>
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</div><hr /><div id="function.swf-lookat" class="refentry">
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<h1 class="refname">swf_lookat</h1>
<p class="verinfo">(PHP 4)</p><p class="refpurpose"><span class="refname">swf_lookat</span> — <span class="dc-title">Define a viewing transformation</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.swf-lookat-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>swf_lookat</strong></span>
( <span class="methodparam"><span class="type">float</span> <code class="parameter">$view_x</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$view_y</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$view_z</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$reference_x</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$reference_y</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$reference_z</code></span>
, <span class="methodparam"><span class="type">float</span> <code class="parameter">$twist</code></span>
)</div>
<p class="para rdfs-comment">
Defines a viewing transformation by giving the viewing position and the
coordinates of a reference point in the scene.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.swf-lookat-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">view_x</code></em></span>
<dd>
<p class="para">
x-coordinate for the viewing position
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">view_y</code></em></span>
<dd>
<p class="para">
y-coordinate for the viewing position
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">view_z</code></em></span>
<dd>
<p class="para">
z-coordinate for the viewing position
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">reference_x</code></em></span>
<dd>
<p class="para">
x-coordinate for the reference point
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">reference_y</code></em></span>
<dd>
<p class="para">
y-coordinate for the reference point
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">reference_z</code></em></span>
<dd>
<p class="para">
z-coordinate for the reference point
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">twist</code></em></span>
<dd>
<p class="para">
Controls the rotation along with viewer's z axis.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.swf-lookat-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
No value is returned.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.swf-lookat-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-3577">
<p><strong>Example #1 A simple 3D-rotation around a text</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br />header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-type: application/x-shockwave-flash'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">swf_openfile</span><span style="color: #007700">(</span><span style="color: #DD0000">"php://stdout"</span><span style="color: #007700">, </span><span style="color: #0000BB">320</span><span style="color: #007700">, </span><span style="color: #0000BB">200</span><span style="color: #007700">, </span><span style="color: #0000BB">25</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">swf_ortho</span><span style="color: #007700">(-</span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, -</span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, -</span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">); </span><span style="color: #FF8000">// create 3D coordinates<br /><br /></span><span style="color: #0000BB">swf_definefont</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #DD0000">"Pix3"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">swf_addcolor</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">swf_fontsize</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">swf_fonttracking</span><span style="color: #007700">(</span><span style="color: #0000BB">0.2</span><span style="color: #007700">);<br /><br />for (</span><span style="color: #0000BB">$i </span><span style="color: #007700">= </span><span style="color: #0000BB">0</span><span style="color: #007700">; </span><span style="color: #0000BB">$i </span><span style="color: #007700">< </span><span style="color: #0000BB">628</span><span style="color: #007700">; </span><span style="color: #0000BB">$i </span><span style="color: #007700">+= </span><span style="color: #0000BB">8</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$j </span><span style="color: #007700">= </span><span style="color: #0000BB">$i </span><span style="color: #007700">/ </span><span style="color: #0000BB">100</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">swf_pushmatrix</span><span style="color: #007700">();<br /> </span><span style="color: #0000BB">swf_translate</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">swf_perspective</span><span style="color: #007700">(</span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">swf_lookat</span><span style="color: #007700">(</span><span style="color: #0000BB">sin</span><span style="color: #007700">(</span><span style="color: #0000BB">$j</span><span style="color: #007700">) * </span><span style="color: #0000BB">60</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">cos</span><span style="color: #007700">(</span><span style="color: #0000BB">$j</span><span style="color: #007700">) * </span><span style="color: #0000BB">60</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">swf_definetext </span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #DD0000">'HotKey@'</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">swf_translate</span><span style="color: #007700">(-</span><span style="color: #0000BB">50</span><span style="color: #007700">,</span><span style="color: #0000BB">0</span><span style="color: #007700">,</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">swf_placeobject</span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">,</span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">swf_definetext</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #DD0000">'example.com'</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">swf_translate</span><span style="color: #007700">(</span><span style="color: #0000BB">55</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">swf_placeobject</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">11</span><span style="color: #007700">);<br /><br /> </span><span style="color: #0000BB">swf_showframe</span><span style="color: #007700">();<br /> </span><span style="color: #0000BB">swf_removeobject</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">swf_removeobject</span><span style="color: #007700">(</span><span style="color: #0000BB">11</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">swf_popmatrix</span><span style="color: #007700">();<br />}<br /><br /></span><span style="color: #0000BB">swf_closefile</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
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</p>
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