General plugins

Once you have installed the offline quiz plugin

Go to the plugin directory: https://yoursite/moodle/mod/offlinequiz

Here you will have to modify the following files (for generating different formats of your quiz).

• locallib.php
  
• pdflib.php
  
• docxlib.php

I edited 1st and 2nd as I did not need DOCx.

In locallib.php, you will have to make changes to the offlinequiz_print_question_preview method

In pdflib.php, you will modify offlinequiz_create_pdf_question method

For locallib.php, follow the following steps:

1. Include the filter file

• moodle/filter/wiris/filter.php
  

2. Add the filter to your array of filters that are already applied

$filters = filter_get_active_in_context($context);

if (array_key_exists('wiris', $filters)) {
    $wirisfilter = new filter_wiris($context, array());
}

3. And then apply the wiris filter to your data:

if ($wirisfilter) {
    $text = $wirisfilter->filter($text);
    if ($question->qtype != 'description') {
        foreach ($choiceorder as $key => $answer) {
            $question->options->answers[$answer]->answer = $wirisfilter->filter($question->options->answers[$answer]->answer);
        }
    }
}

For pdflib.php:

1. Include the filter file as you did above.

2. Create a new wirisfilter variable:

$wirisfilter = new filter_wiris($context, array());

3. Find pdf->checkpoint() in your code and add the wirisfilter:

$pdf->checkpoint();

$questiontext = $question->questiontext;

if (!empty($texfilter)) {
    $questiontext = $texfilter->filter($questiontext);
}

//Add this filter. The above code will be already be there.
if (!empty($wirisfilter)) {
    $questiontext = $wirisfilter->filter($questiontext);
}

We added this to our question text only. We still need to apply to the answers/options yet.

4. Find the foreach loop (shown below) and add the filter to answers/choices

foreach ($order as $key => $answer) {

    //Add this filter code inside the loop
    if (!empty($wirisfilter)) {
        $answertext = $wirisfilter->filter($answertext);
    }

5. Wherever you find any other filter (in my case 'texfilter') already applied in your code, include the wirisfilter there.

These are all the steps I followed to get the rendering proper.

Regards,

Mohanish