php man page for ps_rotate

PS_ROTATE(3)								 1							      PS_ROTATE(3)

ps_rotate - Sets rotation factor

SYNOPSIS
       bool ps_rotate (resource  $psdoc, float	$rot)

DESCRIPTION
	Sets the rotation of the coordinate system.

PARAMETERS
	      o $psdoc
		- Resource identifier of the postscript file as returned by ps_new(3).

	      o $rot
		- Angle of rotation in degree.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

EXAMPLES
       Example #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
";
		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);
	      ?>

	       The  above example illustrates a very common way of rotating a graphic (in this case just a rectangle) by simply rotating the coor-
	      dinate 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(3) and ps_rotate(3). In the above case
	      the rectancle is rotated around the point (100, 100) in the untranslated coordinate system. Switching the two statements has a  com-
	      pletely different result.

	       In  order  to  output  the  following text at the original position, all modifications of the coordinate system are encapsulated in
	      ps_save(3) and ps_restore(3).

SEE ALSO
       ps_scale(3), ps_translate(3).

PHP Documentation Group 													      PS_ROTATE(3)