<?php
#---------------------------------------------------------------------------------------
# Copyright (c) 2001-2012 by PDFTron Systems Inc. All Rights Reserved.
# Consult legal.txt regarding legal and license information.
#---------------------------------------------------------------------------------------
include("../../../Lib/PDFNetPHP.php");

#---------------------------------------------------------------------------------------
# The sample code shows how to edit the page display list and how to modify graphics state 
# attributes on existing Elements. In particular the sample program strips all images from 
# the page and changes text color to blue. 
#---------------------------------------------------------------------------------------

# Relative path to the folder containing the test files.
$input_path = getcwd()."/../../TestFiles/";
$output_path = $input_path."Output/";
$input_filename = "newsletter.pdf";
$output_filename = "newsletter_edited.pdf";

function ProcessElements($reader, $writer) {
	while (($element = $reader->Next()) != null) 	// Read page contents
	{
		switch ($element->GetType())
		{		
		case Element::e_image: 
		case Element::e_inline_image: 
			// remove all images by skipping them			
			break;
		case Element::e_text:// Process text strings...
			{
				// Set all text to blue color.
				$gs = $element->GetGState();
				$gs->SetFillColorSpace(ColorSpace::CreateDeviceRGB());
				$cp = new ColorPt(0.0, 0.0, 1.0);
				$gs->SetFillColor($cp);
				$writer->WriteElement($element);
				break;
			}
		case Element::e_form:// Recursively process form XObjects
			{
				$reader->FormBegin(); 
				ProcessElements($reader, $writer);
				$reader->End(); 				
				break; 
			}
		default:
			$writer->WriteElement($element);
		}
	}
}

	PDFNet::Initialize();
	
	echo nl2br("-------------------------------------------------\n");

	// Open the test file
	echo nl2br("Opening the input file...\n");
	$doc = new PDFDoc($input_path.$input_filename);
	$doc->InitSecurityHandler();

	$writer = new ElementWriter();
	$reader = new ElementReader();
	
	$itr = $doc->GetPageIterator();

	while ($itr->HasNext())
	{
		$page = $itr->Current();
		$reader->Begin($page);
		$writer->Begin($page, ElementWriter::e_replacement, false);
		ProcessElements($reader, $writer);
		$writer->End();
		$reader->End();
		$itr->Next();
	}

	$doc->Save($output_path.$output_filename, SDFDoc::e_remove_unused);		
	echo nl2br("Done. Result saved in ".$output_filename."...\n");
?>