php-doc-en/reference/ps/functions/ps-translate.xml

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<refentry xml:id="function.ps-translate" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>ps_translate</refname>
  <refpurpose>Sets translation</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>ps_translate</methodname>
   <methodparam><type>resource</type><parameter>psdoc</parameter></methodparam>
   <methodparam><type>float</type><parameter>x</parameter></methodparam>
   <methodparam><type>float</type><parameter>y</parameter></methodparam>
  </methodsynopsis>
  <para>
   Sets a new initial point of the coordinate system.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>psdoc</parameter></term>
     <listitem>
      <para>
       Resource identifier of the postscript file
       as returned by <function>ps_new</function>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>x</parameter></term>
     <listitem>
      <para>
       x-coordinate of the origin of the translated coordinate system.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>y</parameter></term>
     <listitem>
      <para>
       y-coordinate of the origin of the translated coordinate system.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

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

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Translation of the coordinate system</title>
    <programlisting role="php">
<![CDATA[
<?php
function rectangle($ps) {
    ps_moveto($ps, 0, 0);
    ps_lineto($ps, 0, 50);
    ps_lineto($ps, 50, 50);
    ps_lineto($ps, 50, 0);
    ps_lineto($ps, 0, 0);
    ps_stroke($ps);
}

$ps = ps_new();
if (!ps_open_file($ps, "translate.ps")) {
  print "Cannot open PostScript file\n";
  exit;
}

ps_set_info($ps, "Creator", "translate.php");
ps_set_info($ps, "Author", "Uwe Steinmann");
ps_set_info($ps, "Title", "Translated example");
ps_set_info($ps, "BoundingBox", "0 0 596 842");

$psfont = ps_findfont($ps, "Helvetica", "", 0);

ps_begin_page($ps, 596, 842);
ps_set_text_pos($ps, 100, 100);
ps_translate($ps, 500, 750);
rectangle($ps);
ps_translate($ps, -500, -750);
ps_setfont($ps, $psfont, 8.0);
ps_show($ps, "Text at initial position");
ps_end_page($ps);

ps_begin_page($ps, 596, 842);
ps_set_text_pos($ps, 100, 100);
ps_save($ps);
ps_translate($ps, 500, 750);
rectangle($ps);
ps_restore($ps);
ps_setfont($ps, $psfont, 8.0);
ps_show($ps, "Text at initial position");
ps_end_page($ps);

ps_delete($ps);
?>

]]>
    </programlisting>
    <para>The above example demonstrates two possible ways to place
     a graphic (in this case just a rectangle) at any position on the page,
     while the graphic itself uses its own coordinate system. The trick is
     to change the origin of the current coordinate system before drawing
     the rectangle. The translation has to be undone after the graphic has
     been drawn.
    </para>
    <para>
     On the second page a slightly different and more elegant approach is
     applied. Instead of undoing the translation with a second call of
     <function>ps_translate</function> the graphics context is saved before
     modifying the coordinate system and restored after drawing the rectangle.
    </para>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>ps_scale</function></member>
    <member><function>ps_rotate</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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