Functions for generating the annotated pdf. More...

Static Public Member Functions
static	copy_pages_to_readonly_area ($assignment, $grade)
	Copy the pages image to the readonly area.

static	delete_feedback_document ($assignment, $userid, $attemptnumber)
	This function deletes the generated pdf for a student.

static	generate_feedback_document ($assignment, $userid, $attemptnumber)
	This function takes the combined pdf and embeds all the comments and annotations.

static	get_combined_document_for_attempt ($assignment, $userid, $attemptnumber)
	Fetch the current combined document ready for state checking.

static	get_combined_pdf_for_attempt ($assignment, $userid, $attemptnumber)
	This function return the combined pdf for all valid submission files.

static	get_feedback_document ($assignment, $userid, $attemptnumber)
	This function returns the generated pdf (if it exists).

static	get_page_images_for_attempt ($assignment, $userid, $attemptnumber, $readonly=false)
	This function returns a list of the page images from a pdf.

static	page_number_for_attempt ($assignment, $userid, $attemptnumber, $readonly=false)
	This function will return the number of pages of a pdf.

static	rotate_page ($assignment, $userid, $attemptnumber, $index, $rotateleft)
	This function rotate a page, and mark the page as rotated.

Public Attributes
const	BLANK_PDF_BASE64 =
	Base64 encoded blank pdf.

const	BLANK_PDF_HASH = '4c803c92c71f21b423d13de570c8a09e0a31c718'
	Hash of blank pdf.

const	COMBINED_PDF_FILEAREA = 'combined'
	File area for combined pdf.

const	COMBINED_PDF_FILENAME = 'combined.pdf'
	Filename for combined pdf.

const	COMPONENT = "assignfeedback_editpdf"
	Compoment name.

const	FINAL_PDF_FILEAREA = 'download'
	File area for generated pdf.

const	IMPORT_HTML_FILEAREA = 'importhtml'
	File area for importing html.

const	PAGE_IMAGE_FILEAREA = 'pages'
	File area for page images.

const	PAGE_IMAGE_READONLY_FILEAREA = 'readonlypages'
	File area for readonly page images.

const	PARTIAL_PDF_FILEAREA = 'partial'
	File area for partial combined pdf.

const	STAMPS_FILEAREA = 'stamps'
	File area for the stamps.

const	TMP_JPG_TO_PDF_FILEAREA = 'tmp_jpg_to_pdf'
	Temporary place to save JPG Image to PDF file.

const	TMP_ROTATED_JPG_FILEAREA = 'tmp_rotated_jpg'
	Temporary place to save (Automatically) Rotated JPG FILE.

Static Protected Member Functions
static	generate_page_images_for_attempt ($assignment, $userid, $attemptnumber, $resetrotation=true)
	This function will generate and return a list of the page images from a pdf.

static	get_downloadable_feedback_filename ($assignment, $userid, $attemptnumber)
	This function returns sensible filename for a feedback file.

static	list_compatible_submission_files_for_attempt ($assignment, $userid, $attemptnumber)
	This function will search for all files that can be converted and concatinated into a PDF (1.4) - for any submission plugin for this students attempt.

static	strip_images ($html)
	Use a DOM parser to accurately replace images with their alt text.

Detailed Description

Functions for generating the annotated pdf.

This class controls the ingest of student submission files to a normalised PDF 1.4 document with all submission files concatinated together. It also provides the functions to generate a downloadable pdf with all comments and annotations embedded.

Copyright: 2012 Davo Smith

License: http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

Member Function Documentation

◆ copy_pages_to_readonly_area()

static assignfeedback_editpdf\document_services::copy_pages_to_readonly_area	(		$assignment,
			$grade )

static

Copy the pages image to the readonly area.

Parameters

int \| assign	$assignment	The assignment.
stdClass	$grade	The grade record.

Return values

void

◆ delete_feedback_document()

static assignfeedback_editpdf\document_services::delete_feedback_document	(	$assignment,
		$userid,
		$attemptnumber )

static

This function deletes the generated pdf for a student.

Parameters

int \| assign	$assignment
int	$userid
int	$attemptnumber	(-1 means latest attempt)

Return values

bool

◆ generate_feedback_document()

static assignfeedback_editpdf\document_services::generate_feedback_document	(	$assignment,
		$userid,
		$attemptnumber )

static

This function takes the combined pdf and embeds all the comments and annotations.

This also moves the annotations and comments from drafts to not drafts. And it will copy all the images stored to the readonly area, so that they can be viewed online, and not be overwritten when a new submission is sent.

Parameters

int \| assign	$assignment
int	$userid
int	$attemptnumber	(-1 means latest attempt)

Return values

stored_file

◆ generate_page_images_for_attempt()

static assignfeedback_editpdf\document_services::generate_page_images_for_attempt	(	$assignment,
		$userid,
		$attemptnumber,
		$resetrotation = true )

staticprotected

This function will generate and return a list of the page images from a pdf.

Parameters

int \| assign	$assignment
int	$userid
int	$attemptnumber	(-1 means latest attempt)
bool	$resetrotation	check if need to reset page rotation information

Return values

array(stored_file)

◆ get_combined_document_for_attempt()

static assignfeedback_editpdf\document_services::get_combined_document_for_attempt	(	$assignment,
		$userid,
		$attemptnumber )

static

Fetch the current combined document ready for state checking.

Parameters

int \| assign	$assignment
int	$userid
int	$attemptnumber	(-1 means latest attempt)

Return values

combined_document

◆ get_combined_pdf_for_attempt()

static assignfeedback_editpdf\document_services::get_combined_pdf_for_attempt	(	$assignment,
		$userid,
		$attemptnumber )

static

This function return the combined pdf for all valid submission files.

Parameters

int \| assign	$assignment
int	$userid
int	$attemptnumber	(-1 means latest attempt)

Return values

combined_document

◆ get_downloadable_feedback_filename()

static assignfeedback_editpdf\document_services::get_downloadable_feedback_filename	(	$assignment,
		$userid,
		$attemptnumber )

staticprotected

This function returns sensible filename for a feedback file.

Parameters

int \| assign	$assignment
int	$userid
int	$attemptnumber	(-1 means latest attempt)

Return values

string

◆ get_feedback_document()

static assignfeedback_editpdf\document_services::get_feedback_document	(	$assignment,
		$userid,
		$attemptnumber )

static

This function returns the generated pdf (if it exists).

Parameters

int \| assign	$assignment
int	$userid
int	$attemptnumber	(-1 means latest attempt)

Return values

stored_file

◆ get_page_images_for_attempt()

static assignfeedback_editpdf\document_services::get_page_images_for_attempt	(	$assignment,
		$userid,
		$attemptnumber,
		$readonly = false )

static

This function returns a list of the page images from a pdf.

The readonly version is different than the normal one. The readonly version contains a copy of the pages in the state they were when the PDF was annotated, by doing so we prevent the the pages that are displayed to change as soon as the submission changes.

Though there is an edge case, if the PDF was annotated before MDL-45580, then it is possible that we do not find any readonly version of the pages. In that case, we will get the normal pages and copy them to the readonly area. This ensures that the pages will remain in that state until the submission is updated. When the normal files do not exist, we throw an exception because the readonly pages should only ever be displayed after a teacher has annotated the PDF, they would not exist until they do.

Parameters

int \| assign	$assignment
int	$userid
int	$attemptnumber	(-1 means latest attempt)
bool	$readonly	If true, then we are requesting the readonly version.

Return values

array(stored_file)

◆ list_compatible_submission_files_for_attempt()

static assignfeedback_editpdf\document_services::list_compatible_submission_files_for_attempt	(	$assignment,
		$userid,
		$attemptnumber )

staticprotected

This function will search for all files that can be converted and concatinated into a PDF (1.4) - for any submission plugin for this students attempt.

Parameters

int \| assign	$assignment
int	$userid
int	$attemptnumber	(-1 means latest attempt)

Return values

combined_document

◆ page_number_for_attempt()

static assignfeedback_editpdf\document_services::page_number_for_attempt	(	$assignment,
		$userid,
		$attemptnumber,
		$readonly = false )

static

This function will return the number of pages of a pdf.

Parameters

int \| assign	$assignment
int	$userid
int	$attemptnumber	(-1 means latest attempt)
bool	$readonly	When true we get the number of pages for the readonly version.

Return values

int	number of pages

◆ rotate_page()

static assignfeedback_editpdf\document_services::rotate_page	(	$assignment,
		$userid,
		$attemptnumber,
		$index,
		$rotateleft )

static

This function rotate a page, and mark the page as rotated.

Parameters

int \| assign	$assignment	Assignment
int	$userid	User ID
int	$attemptnumber	Attempt Number
int	$index	Index of Current Page
bool	$rotateleft	To determine whether the page is rotated left or right.

Return values

null|stored_file return rotated File

Exceptions

coding_exception
file_exception
moodle_exception
stored_file_creation_exception

◆ strip_images()

static assignfeedback_editpdf\document_services::strip_images ( $html )

staticprotected

Use a DOM parser to accurately replace images with their alt text.

Parameters

string $html

Return values

string New html with no image tags.

Member Data Documentation

◆ BLANK_PDF_BASE64

const assignfeedback_editpdf\document_services::BLANK_PDF_BASE64 =

Base64 encoded blank pdf.

This is the most reliable/fastest way to generate a blank pdf.

The documentation for this class was generated from the following file:

mod/assign/feedback/editpdf/classes/document_services.php

Static Public Member Functions

Public Attributes

Static Protected Member Functions

Detailed Description

Member Function Documentation

◆ copy_pages_to_readonly_area()

◆ delete_feedback_document()

◆ generate_feedback_document()

◆ generate_page_images_for_attempt()

◆ get_combined_document_for_attempt()

◆ get_combined_pdf_for_attempt()

◆ get_downloadable_feedback_filename()

◆ get_feedback_document()

◆ get_page_images_for_attempt()

◆ list_compatible_submission_files_for_attempt()

◆ page_number_for_attempt()

◆ rotate_page()

◆ strip_images()

Member Data Documentation

◆ BLANK_PDF_BASE64