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855 lines
22 KiB
855 lines
22 KiB
<?php
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/*
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DOKEOS - elearning and course management software
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For a full list of contributors, see documentation/credits.html
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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See "documentation/licence.html" more details.
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Contact:
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Dokeos
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Rue des Palais 44 Paleizenstraat
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B-1030 Brussels - Belgium
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Tel. +32 (2) 211 34 56
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*/
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/**
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* File containing the Question class.
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* @package dokeos.exercise
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* @author Olivier Brouckaert
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* @version $Id: question.class.php 12078 2007-04-23 09:05:34Z elixir_julian $
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*/
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if(!class_exists('Question')):
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// answer types
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define(UNIQUE_ANSWER, 1);
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define(MULTIPLE_ANSWER, 2);
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define(FILL_IN_BLANKS, 3);
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define(MATCHING, 4);
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define(FREE_ANSWER, 5);
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define(HOT_SPOT, 6);
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define(HOT_SPOT_ORDER, 7);
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/**
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CLASS QUESTION
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*
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* This class allows to instantiate an object of type Question
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*
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* @author Olivier Brouckaert, original author
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* @author Patrick Cool, LaTeX support
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* @package dokeos.exercise
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*/
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abstract class Question
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{
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var $id;
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var $question;
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var $description;
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var $weighting;
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var $position;
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var $type;
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var $picture;
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var $exerciseList; // array with the list of exercises which this question is in
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static $typePicture = 'new_question.png';
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static $explanationLangVar = '';
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static $questionTypes = array(
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UNIQUE_ANSWER => array('unique_answer.class.php' , 'UniqueAnswer'),
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MULTIPLE_ANSWER => array('multiple_answer.class.php' , 'MultipleAnswer'),
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FILL_IN_BLANKS => array('fill_blanks.class.php' , 'FillBlanks'),
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MATCHING => array('matching.class.php' , 'Matching'),
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FREE_ANSWER => array('freeanswer.class.php' , 'FreeAnswer'),
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HOT_SPOT => array('hotspot.class.php' , 'HotSpot')
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);
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/**
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* constructor of the class
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*
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* @author - Olivier Brouckaert
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*/
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function Question()
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{
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$this->id=0;
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$this->question='';
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$this->description='';
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$this->weighting=0;
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$this->position=1;
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$this->picture='';
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$this->exerciseList=array();
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}
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/**
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* reads question informations from the data base
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*
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* @author - Olivier Brouckaert
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* @param - integer $id - question ID
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* @return - boolean - true if question exists, otherwise false
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*/
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static function read($id)
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{
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global $_course;
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$TBL_EXERCICES = Database::get_course_table(TABLE_QUIZ_TEST);
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$TBL_QUESTIONS = Database::get_course_table(TABLE_QUIZ_QUESTION);
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$TBL_EXERCICE_QUESTION = Database::get_course_table(TABLE_QUIZ_TEST_QUESTION);
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$sql="SELECT question,description,ponderation,position,type,picture FROM $TBL_QUESTIONS WHERE id='$id'";
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$result=api_sql_query($sql,__FILE__,__LINE__);
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// if the question has been found
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if($object=mysql_fetch_object($result))
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{
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$objQuestion = Question::getInstance($object->type);
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$objQuestion->id=$id;
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$objQuestion->question=$object->question;
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$objQuestion->description=$object->description;
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$objQuestion->weighting=$object->ponderation;
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$objQuestion->position=$object->position;
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$objQuestion->type=$object->type;
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$objQuestion->picture=$object->picture;
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$sql="SELECT exercice_id FROM $TBL_EXERCICE_QUESTION WHERE question_id='".intval($id)."'";
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$result=api_sql_query($sql,__FILE__,__LINE__);
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// fills the array with the exercises which this question is in
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while($object=mysql_fetch_object($result))
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{
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$objQuestion->exerciseList[]=$object->exercice_id;
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}
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return $objQuestion;
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}
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// question not found
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return false;
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}
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/**
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* returns the question ID
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*
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* @author - Olivier Brouckaert
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* @return - integer - question ID
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*/
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function selectId()
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{
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return $this->id;
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}
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/**
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* returns the question title
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*
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* @author - Olivier Brouckaert
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* @return - string - question title
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*/
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function selectTitle()
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{
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$this->question=api_parse_tex($this->question);
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return $this->question;
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}
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/**
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* returns the question description
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*
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* @author - Olivier Brouckaert
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* @return - string - question description
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*/
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function selectDescription()
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{
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$this->description=api_parse_tex($this->description);
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return $this->description;
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}
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/**
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* returns the question weighting
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*
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* @author - Olivier Brouckaert
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* @return - integer - question weighting
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*/
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function selectWeighting()
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{
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return $this->weighting;
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}
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/**
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* returns the question position
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*
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* @author - Olivier Brouckaert
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* @return - integer - question position
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*/
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function selectPosition()
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{
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return $this->position;
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}
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/**
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* returns the answer type
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*
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* @author - Olivier Brouckaert
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* @return - integer - answer type
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*/
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function selectType()
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{
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return $this->type;
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}
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/**
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* returns the picture name
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*
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* @author - Olivier Brouckaert
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* @return - string - picture name
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*/
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function selectPicture()
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{
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return $this->picture;
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}
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/**
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* returns the array with the exercise ID list
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*
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* @author - Olivier Brouckaert
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* @return - array - list of exercise ID which the question is in
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*/
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function selectExerciseList()
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{
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return $this->exerciseList;
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}
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/**
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* returns the number of exercises which this question is in
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*
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* @author - Olivier Brouckaert
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* @return - integer - number of exercises
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*/
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function selectNbrExercises()
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{
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return sizeof($this->exerciseList);
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}
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/**
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* changes the question title
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*
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* @author - Olivier Brouckaert
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* @param - string $title - question title
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*/
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function updateTitle($title)
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{
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$this->question=$title;
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}
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/**
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* changes the question description
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*
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* @author - Olivier Brouckaert
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* @param - string $description - question description
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*/
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function updateDescription($description)
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{
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$this->description=$description;
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}
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/**
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* changes the question weighting
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*
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* @author - Olivier Brouckaert
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* @param - integer $weighting - question weighting
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*/
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function updateWeighting($weighting)
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{
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$this->weighting=$weighting;
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}
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/**
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* changes the question position
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*
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* @author - Olivier Brouckaert
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* @param - integer $position - question position
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*/
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function updatePosition($position)
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{
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$this->position=$position;
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}
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/**
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* changes the answer type. If the user changes the type from "unique answer" to "multiple answers"
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* (or conversely) answers are not deleted, otherwise yes
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*
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* @author - Olivier Brouckaert
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* @param - integer $type - answer type
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*/
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function updateType($type)
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{
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global $TBL_REPONSES;
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// if we really change the type
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if($type != $this->type)
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{
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// if we don't change from "unique answer" to "multiple answers" (or conversely)
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if(!in_array($this->type,array(UNIQUE_ANSWER,MULTIPLE_ANSWER)) || !in_array($type,array(UNIQUE_ANSWER,MULTIPLE_ANSWER)))
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{
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// removes old answers
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$sql="DELETE FROM $TBL_REPONSES WHERE question_id='".$this->id."'";
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api_sql_query($sql,__FILE__,__LINE__);
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}
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$this->type=$type;
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}
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}
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/**
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* adds a picture to the question
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*
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* @author - Olivier Brouckaert
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* @param - string $Picture - temporary path of the picture to upload
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* @param - string $PictureName - Name of the picture
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* @return - boolean - true if uploaded, otherwise false
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*/
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function uploadPicture($Picture,$PictureName)
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{
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global $picturePath;
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// if the question has got an ID
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if($this->id)
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{
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$PictureName=explode('.',$PictureName);
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$Extension=$PictureName[sizeof($PictureName)-1];
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$this->picture='quiz-'.$this->id.'.'.$Extension;
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return move_uploaded_file($Picture,$picturePath.'/'.$this->picture)?true:false;
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}
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return false;
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}
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/**
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* Resizes a picture || Warning!: can only be called after uploadPicture, or if picture is already available in object.
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*
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* @author - Toon Keppens
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* @param - string $Dimension - Resizing happens proportional according to given dimension: height|width|any
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* @param - integer $Max - Maximum size
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* @return - boolean - true if success, false if failed
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*/
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function resizePicture($Dimension, $Max)
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{
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global $picturePath;
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// if the question has an ID
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if($this->id)
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{
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// Get dimensions from current image.
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$current_img = imagecreatefromjpeg($picturePath.'/'.$this->picture);
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$current_image_size = getimagesize($picturePath.'/'.$this->picture);
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$current_height = imagesy($current_img);
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$current_width = imagesx($current_img);
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if($current_image_size[0] < $Max && $current_image_size[1] <$Max)
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return true;
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elseif($current_height == "")
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return false;
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// Resize according to height.
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if ($Dimension == "height")
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{
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$resize_scale = $current_height / $Max;
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$new_height = $Max;
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$new_width = ceil($current_width / $resize_scale);
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}
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// Resize according to width
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if ($Dimension == "width")
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{
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$resize_scale = $current_width / $Max;
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$new_width = $Max;
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$new_height = ceil($current_height / $resize_scale);
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}
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// Resize according to height or width, both should not be larger than $Max after resizing.
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if ($Dimension == "any")
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{
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if ($current_height > $current_width || $current_height == $current_width)
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{
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$resize_scale = $current_height / $Max;
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$new_height = $Max;
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$new_width = ceil($current_width / $resize_scale);
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}
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if ($current_height < $current_width)
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{
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$resize_scale = $current_width / $Max;
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$new_width = $Max;
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$new_height = ceil($current_height / $resize_scale);
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}
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}
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// Create new image
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$new_img = imagecreatetruecolor($new_width, $new_height);
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$bgColor = imagecolorallocate($new_img, 255,255,255);
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imagefill($new_img , 0,0 , $bgColor);
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// Resize image
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imagecopyresized($new_img, $current_img, 0, 0, 0, 0, $new_width, $new_height, $current_width, $current_height);
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// Write image to file
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$result = imagejpeg($new_img, $picturePath.'/'.$this->picture, 100);
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// Delete temperory images, clear memory
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imagedestroy($current_img);
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imagedestroy($new_img);
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if ($result)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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}
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/**
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* deletes the picture
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*
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* @author - Olivier Brouckaert
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* @return - boolean - true if removed, otherwise false
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*/
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function removePicture()
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{
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global $picturePath;
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// if the question has got an ID and if the picture exists
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if($this->id)
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{
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$picture=$this->picture;
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$this->picture='';
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return @unlink($picturePath.'/'.$picture)?true:false;
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}
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return false;
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}
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/**
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* exports a picture to another question
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*
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* @author - Olivier Brouckaert
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* @param - integer $questionId - ID of the target question
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* @return - boolean - true if copied, otherwise false
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*/
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function exportPicture($questionId)
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{
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global $TBL_QUESTIONS, $picturePath;
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// if the question has got an ID and if the picture exists
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if($this->id && !empty($this->picture))
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{
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$picture=explode('.',$this->picture);
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$Extension=$picture[sizeof($picture)-1];
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$picture='quiz-'.$questionId.'.'.$Extension;
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$sql="UPDATE $TBL_QUESTIONS SET picture='$picture' WHERE id='$questionId'";
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api_sql_query($sql,__FILE__,__LINE__);
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return @copy($picturePath.'/'.$this->picture,$picturePath.'/'.$picture)?true:false;
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}
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return false;
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}
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/**
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* saves the picture coming from POST into a temporary file
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* Temporary pictures are used when we don't want to save a picture right after a form submission.
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* For example, if we first show a confirmation box.
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*
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* @author - Olivier Brouckaert
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* @param - string $Picture - temporary path of the picture to move
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* @param - string $PictureName - Name of the picture
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*/
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function setTmpPicture($Picture,$PictureName)
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{
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global $picturePath;
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$PictureName=explode('.',$PictureName);
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$Extension=$PictureName[sizeof($PictureName)-1];
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// saves the picture into a temporary file
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@move_uploaded_file($Picture,$picturePath.'/tmp.'.$Extension);
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}
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/**
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* moves the temporary question "tmp" to "quiz-$questionId"
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* Temporary pictures are used when we don't want to save a picture right after a form submission.
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* For example, if we first show a confirmation box.
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*
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* @author - Olivier Brouckaert
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* @return - boolean - true if moved, otherwise false
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*/
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function getTmpPicture()
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{
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global $picturePath;
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// if the question has got an ID and if the picture exists
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if($this->id)
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{
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if(file_exists($picturePath.'/tmp.jpg'))
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{
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$Extension='jpg';
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}
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elseif(file_exists($picturePath.'/tmp.gif'))
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{
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$Extension='gif';
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}
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elseif(file_exists($picturePath.'/tmp.png'))
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{
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$Extension='png';
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}
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$this->picture='quiz-'.$this->id.'.'.$Extension;
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return @rename($picturePath.'/tmp.'.$Extension,$picturePath.'/'.$this->picture)?true:false;
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}
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return false;
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}
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/**
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* updates the question in the data base
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* if an exercise ID is provided, we add that exercise ID into the exercise list
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*
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* @author - Olivier Brouckaert
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* @param - integer $exerciseId - exercise ID if saving in an exercise
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*/
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function save($exerciseId=0)
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{
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global $TBL_QUESTIONS, $TBL_EXERCICE_QUESTION, $_course;
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$id=$this->id;
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$question=addslashes($this->question);
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$description=addslashes($this->description);
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$weighting=$this->weighting;
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$position=$this->position;
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$type=$this->type;
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$picture=addslashes($this->picture);
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// question already exists
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if($id)
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{
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$sql="UPDATE $TBL_QUESTIONS SET question='$question',description='$description',ponderation='$weighting',position='$position',type='$type',picture='$picture' WHERE id='$id'";
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api_sql_query($sql,__FILE__,__LINE__);
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}
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// creates a new question
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else
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{
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$sql="SELECT max(position) FROM $TBL_QUESTIONS as question, $TBL_EXERCICE_QUESTION as test_question WHERE question.id=test_question.question_id AND test_question.exercice_id='$exerciseId'";
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$result=api_sql_query($sql);
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$current_position=mysql_result($result,0,0);
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$this -> updatePosition($current_position+1);
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$position = $this -> position;
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$sql="INSERT INTO $TBL_QUESTIONS(question,description,ponderation,position,type,picture) VALUES('$question','$description','$weighting','$position','$type','$picture')";
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api_sql_query($sql,__FILE__,__LINE__);
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$this->id=mysql_insert_id();
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// If hotspot, create first answer
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if ($type == HOT_SPOT || $type == HOT_SPOT_ORDER) {
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$TBL_ANSWERS = Database::get_course_table(TABLE_QUIZ_ANSWER);
|
|
|
|
$sql="INSERT INTO $TBL_ANSWERS (`id` , `question_id` , `answer` , `correct` , `comment` , `ponderation` , `position` , `hotspot_coordinates` , `hotspot_type` ) VALUES ('1', '$this->id', '', NULL , '', NULL , '1', '0;0|0|0', 'square')";
|
|
api_sql_query($sql,__FILE__,__LINE__);
|
|
}
|
|
}
|
|
|
|
// if the question is created in an exercise
|
|
if($exerciseId)
|
|
{
|
|
// adds the exercise into the exercise list of this question
|
|
$this->addToList($exerciseId);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* adds an exercise into the exercise list
|
|
*
|
|
* @author - Olivier Brouckaert
|
|
* @param - integer $exerciseId - exercise ID
|
|
*/
|
|
function addToList($exerciseId)
|
|
{
|
|
global $TBL_EXERCICE_QUESTION;
|
|
|
|
$id=$this->id;
|
|
|
|
// checks if the exercise ID is not in the list
|
|
if(!in_array($exerciseId,$this->exerciseList))
|
|
{
|
|
$this->exerciseList[]=$exerciseId;
|
|
|
|
$sql="INSERT INTO $TBL_EXERCICE_QUESTION(question_id,exercice_id) VALUES('$id','$exerciseId')";
|
|
|
|
api_sql_query($sql,__FILE__,__LINE__);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* removes an exercise from the exercise list
|
|
*
|
|
* @author - Olivier Brouckaert
|
|
* @param - integer $exerciseId - exercise ID
|
|
* @return - boolean - true if removed, otherwise false
|
|
*/
|
|
function removeFromList($exerciseId)
|
|
{
|
|
global $TBL_EXERCICE_QUESTION;
|
|
|
|
$id=$this->id;
|
|
|
|
// searches the position of the exercise ID in the list
|
|
$pos=array_search($exerciseId,$this->exerciseList);
|
|
|
|
// exercise not found
|
|
if($pos === false)
|
|
{
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
// deletes the position in the array containing the wanted exercise ID
|
|
unset($this->exerciseList[$pos]);
|
|
|
|
$sql="DELETE FROM $TBL_EXERCICE_QUESTION WHERE question_id='$id' AND exercice_id='$exerciseId'";
|
|
api_sql_query($sql,__FILE__,__LINE__);
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* deletes a question from the database
|
|
* the parameter tells if the question is removed from all exercises (value = 0),
|
|
* or just from one exercise (value = exercise ID)
|
|
*
|
|
* @author - Olivier Brouckaert
|
|
* @param - integer $deleteFromEx - exercise ID if the question is only removed from one exercise
|
|
*/
|
|
function delete($deleteFromEx=0)
|
|
{
|
|
global $TBL_EXERCICE_QUESTION, $TBL_QUESTIONS, $TBL_REPONSES;
|
|
|
|
$id=$this->id;
|
|
|
|
// if the question must be removed from all exercises
|
|
if(!$deleteFromEx)
|
|
{
|
|
$sql="DELETE FROM $TBL_EXERCICE_QUESTION WHERE question_id='$id'";
|
|
api_sql_query($sql,__FILE__,__LINE__);
|
|
|
|
$sql="DELETE FROM $TBL_QUESTIONS WHERE id='$id'";
|
|
api_sql_query($sql,__FILE__,__LINE__);
|
|
|
|
$sql="DELETE FROM $TBL_REPONSES WHERE question_id='$id'";
|
|
api_sql_query($sql,__FILE__,__LINE__);
|
|
|
|
$this->removePicture();
|
|
|
|
// resets the object
|
|
$this->Question();
|
|
}
|
|
// just removes the exercise from the list
|
|
else
|
|
{
|
|
$this->removeFromList($deleteFromEx);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* duplicates the question
|
|
*
|
|
* @author - Olivier Brouckaert
|
|
* @return - integer - ID of the new question
|
|
*/
|
|
function duplicate()
|
|
{
|
|
global $TBL_QUESTIONS, $picturePath;
|
|
|
|
$question=addslashes($this->question);
|
|
$description=addslashes($this->description);
|
|
$weighting=$this->weighting;
|
|
$position=$this->position;
|
|
$type=$this->type;
|
|
|
|
$sql="INSERT INTO $TBL_QUESTIONS(question,description,ponderation,position,type) VALUES('$question','$description','$weighting','$position','$type')";
|
|
api_sql_query($sql,__FILE__,__LINE__);
|
|
|
|
$id=mysql_insert_id();
|
|
|
|
// duplicates the picture
|
|
$this->exportPicture($id);
|
|
|
|
return $id;
|
|
}
|
|
|
|
/**
|
|
* Returns an instance of the class corresponding to the type
|
|
* @param integer $type the type of the question
|
|
* @return an instance of a Question subclass (or of Questionc class by default)
|
|
*/
|
|
static function getInstance ($type) {
|
|
|
|
list($file_name,$class_name) = self::$questionTypes[$type];
|
|
|
|
include_once ($file_name);
|
|
|
|
|
|
if(class_exists($class_name))
|
|
{
|
|
return new $class_name();
|
|
}
|
|
else
|
|
{
|
|
echo 'Can\'t instanciate class '.$class_name.' of type '.$type;
|
|
return null;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Creates the form to create / edit a question
|
|
* A subclass can redifine this function to add fields...
|
|
* @param FormValidator $form the formvalidator instance (by reference)
|
|
*/
|
|
function createForm (&$form) {
|
|
|
|
echo ' <style>
|
|
div.row div.label{ width: 10%; }
|
|
div.row div.formw{ width: 89%; }
|
|
</style>';
|
|
|
|
// question name
|
|
$test=$form->addElement('text','questionName',get_lang('Question'),'size="60"');
|
|
$renderer = $form->defaultRenderer();
|
|
$renderer->setElementTemplate('<div class="row"><div class="label">{label}</div><div class="formw">{element}</div></div>','questionName');
|
|
$form->addRule('questionName', get_lang('GiveQuestion'), 'required');
|
|
|
|
// question type
|
|
$answerType= intval($_REQUEST['answerType']);
|
|
$form->addElement('hidden','answerType',$_REQUEST['answerType']);
|
|
|
|
|
|
// html editor
|
|
global $fck_attribute;
|
|
$fck_attribute = array();
|
|
$fck_attribute['Width'] = '100%';
|
|
$fck_attribute['Height'] = '150';
|
|
$fck_attribute['ToolbarSet'] = 'TestComment';
|
|
$fck_attribute['Config']['IMUploadPath'] = 'upload/test/';
|
|
$fck_attribute['Config']['FlashUploadPath'] = 'upload/test/';
|
|
if(!api_is_allowed_to_edit()) $fck_attribute['Config']['UserStatus'] = 'student';
|
|
|
|
$form->add_html_editor('questionDescription', get_lang('QuestionDescription'), false);
|
|
$renderer->setElementTemplate('<div class="row"><div class="label">{label}</div><div class="formw">{element}</div></div>','questionDescription');
|
|
|
|
// hidden values
|
|
$form->addElement('hidden','myid',$_REQUEST['myid']);
|
|
|
|
|
|
// default values
|
|
$defaults = array();
|
|
$defaults['questionName'] = $this -> question;
|
|
$defaults['questionDescription'] = $this -> description;
|
|
$form -> setDefaults($defaults);
|
|
}
|
|
|
|
/**
|
|
* function which process the creation of questions
|
|
* @param FormValidator $form the formvalidator instance
|
|
* @param Exercise $objExercise the Exercise instance
|
|
*/
|
|
function processCreation ($form, $objExercise) {
|
|
|
|
$this -> updateTitle($form->getSubmitValue('questionName'));
|
|
$this -> updateDescription($form->getSubmitValue('questionDescription'));
|
|
$this -> save($objExercise -> id);
|
|
|
|
// modify the exercise
|
|
$objExercise->addToList($this -> id);
|
|
$objExercise->save();
|
|
|
|
}
|
|
|
|
/**
|
|
* abstract function which creates the form to create / edit the answers of the question
|
|
* @param the formvalidator instance
|
|
*/
|
|
abstract function createAnswersForm ($form);
|
|
|
|
/**
|
|
* abstract function which process the creation of answers
|
|
* @param the formvalidator instance
|
|
*/
|
|
abstract function processAnswersCreation ($form);
|
|
|
|
|
|
/**
|
|
* Displays the menu of question types
|
|
*/
|
|
static function display_type_menu ()
|
|
{
|
|
global $exerciseId;
|
|
echo '<strong>'.get_lang('AddQ').' :</strong> <div>';
|
|
foreach(self::$questionTypes as $i=>$a_type)
|
|
{
|
|
|
|
// include the class of the type
|
|
include_once($a_type[0]);
|
|
|
|
// get the picture of the type and the langvar which describes it
|
|
eval('$img = '.$a_type[1].'::$typePicture;');
|
|
eval('$explanation = get_lang('.$a_type[1].'::$explanationLangVar);');
|
|
|
|
echo '
|
|
<div id="answer_type_'.$i.'" style="float: left; width:120px; text-align:center">
|
|
<a href="admin.php?newQuestion=yes&answerType='.$i.'">
|
|
<div>
|
|
<img src="'.api_get_path(WEB_IMG_PATH).'/'.$img.'" />
|
|
</div>
|
|
<div>
|
|
'.$explanation.'
|
|
</div>
|
|
</a>
|
|
</div>';
|
|
|
|
}
|
|
echo '
|
|
<div id="answer_type_'.$i.'" style="float: left; width:120px; text-align:center">
|
|
<a href="question_pool.php?fromExercise='.$exerciseId.'">
|
|
<div>
|
|
<img src="'.api_get_path(WEB_IMG_PATH).'/database.gif" />
|
|
</div>
|
|
<div>
|
|
'.get_lang('GetExistingQuestion').'
|
|
</div>
|
|
</a>
|
|
</div>
|
|
</div>
|
|
<div style="clear:both"></div>';
|
|
|
|
}
|
|
}
|
|
|
|
endif;
|
|
|
|
|
|
?>
|
|
|