php man page for ps_translate

PS_TRANSLATE(3) 							 1							   PS_TRANSLATE(3)

ps_translate - Sets translation

SYNOPSIS
       bool ps_translate (resource  $psdoc, float  $x, float  $y)

DESCRIPTION
	Sets a new initial point of the coordinate system.

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

	      o $x
		- x-coordinate of the origin of the translated coordinate system.

	      o $y
		- y-coordinate of the origin of the translated coordinate system.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

EXAMPLES
       Example #1

	      Translation 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, "translate.ps")) {
		print "Cannot open PostScript file
";
		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);
	      ?>

	      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.

	       On the second page a slightly different and more elegant approach is applied. Instead of undoing the translation with a second call
	      of ps_translate(3) the graphics context is saved before modifying the coordinate system and restored after drawing the rectangle.

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

PHP Documentation Group 													   PS_TRANSLATE(3)