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ps_rotate (PECL) ps_rotate -- Sets rotation factor Descrizionebool ps_rotate ( resource psdoc, float rot )
Sets the rotation of the coordinate system.
Elenco dei parametri
- psdoc
Resource identifier of the postscript file
as returned by ps_new().
- rot
Angle of rotation in degree.
Valori restituiti
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
Esempi
Esempio 1. Rotation of the coordinate system
<?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, "rotation.ps")) {
print "Cannot open PostScript file\n";
exit;
}
ps_set_info($ps, "Creator", "rotation.php");
ps_set_info($ps, "Author", "Uwe Steinmann");
ps_set_info($ps, "Title", "Rotation example");
ps_set_info($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_save($ps);
ps_translate($ps, 100, 100);
ps_rotate($ps, 45);
rectangle($ps);
ps_restore($ps);
ps_setfont($ps, $psfont, 8.0);
ps_show($ps, "Text without rotation");
ps_end_page($ps);
ps_delete($ps);
?>
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The above example illustrates a very common way of rotating a
graphic (in this case just a rectangle) by simply rotating the
coordinate system. Since the graphic's coordinate system assumes
(0,0) to be the origin, the page coordinate system is also translated
to place the graphics not on the edge of the page. Pay attention
to the order of ps_translate() and
ps_rotate(). In the above case the rectancle is
rotated around the point (100, 100) in the untranslated coordinate
system. Switching the two statements has a completely
different result.
In order to output the following text at the original position, all
modifications of the coordinate system are encapsulated in
ps_save() and ps_restore().
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