<?php // $Id: question.class.php 10234 2006-11-28 13:43:34Z develop-it $
/*
==============================================================================
Dokeos - elearning and course management software
Copyright (c) 2004 Dokeos S.A.
Copyright (c) 2003 Ghent University (UGent)
Copyright (c) 2001 Universite catholique de Louvain (UCL)
Copyright (c) Olivier Brouckaert
For a full list of contributors, see "credits.txt".
The full license can be read in "license.txt".
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
See the GNU General Public License for more details.
Contact: Dokeos, 181 rue Royale, B-1000 Brussels, Belgium, info@dokeos.com
==============================================================================
*/
/**
==============================================================================
* File containing the Question class.
*
* @author Olivier Brouckaert
* @package dokeos.exercise
==============================================================================
*/
if(!class_exists('Question')):
/**
CLASS QUESTION
*
* This class allows to instantiate an object of type Question
*
* @author Olivier Brouckaert, original author
* @author Patrick Cool, LaTeX support
* @package dokeos.exercise
*/
class Question
{
var $id;
var $question;
var $description;
var $weighting;
var $position;
var $type;
var $picture;
var $exerciseList; // array with the list of exercises which this question is in
/**
* constructor of the class
*
* @author - Olivier Brouckaert
*/
function Question()
{
$this->id=0;
$this->question='';
$this->description='';
$this->weighting=0;
$this->position=1;
$this->type=2;
$this->picture='';
$this->exerciseList=array();
}
/**
* reads question informations from the data base
*
* @author - Olivier Brouckaert
* @param - integer $id - question ID
* @return - boolean - true if question exists, otherwise false
*/
function read($id)
{
global $_course;
$TBL_EXERCICES = $_course['dbNameGlu'].'quiz';
$TBL_QUESTIONS = $_course['dbNameGlu'].'quiz_question';
$TBL_EXERCICE_QUESTION = $_course['dbNameGlu'].'quiz_rel_question';
$sql="SELECT question,description,ponderation,position,type,picture FROM `$TBL_QUESTIONS` WHERE id='$id'";
$result=api_sql_query($sql,__FILE__,__LINE__);
// if the question has been found
if($object=mysql_fetch_object($result))
{
$this->id=$id;
$this->question=$object->question;
$this->description=$object->description;
$this->weighting=$object->ponderation;
$this->position=$object->position;
$this->type=$object->type;
$this->picture=$object->picture;
$sql="SELECT exercice_id FROM `$TBL_EXERCICE_QUESTION` WHERE question_id='$id'";
$result=api_sql_query($sql,__FILE__,__LINE__);
// fills the array with the exercises which this question is in
while($object=mysql_fetch_object($result))
{
$this->exerciseList[]=$object->exercice_id;
}
return true;
}
// question not found
return false;
}
/**
* returns the question ID
*
* @author - Olivier Brouckaert
* @return - integer - question ID
*/
function selectId()
{
return $this->id;
}
/**
* returns the question title
*
* @author - Olivier Brouckaert
* @return - string - question title
*/
function selectTitle()
{
$this->question=api_parse_tex($this->question);
return $this->question;
}
/**
* returns the question description
*
* @author - Olivier Brouckaert
* @return - string - question description
*/
function selectDescription()
{
$this->description=api_parse_tex($this->description);
return $this->description;
}
/**
* returns the question weighting
*
* @author - Olivier Brouckaert
* @return - integer - question weighting
*/
function selectWeighting()
{
return $this->weighting;
}
/**
* returns the question position
*
* @author - Olivier Brouckaert
* @return - integer - question position
*/
function selectPosition()
{
return $this->position;
}
/**
* returns the answer type
*
* @author - Olivier Brouckaert
* @return - integer - answer type
*/
function selectType()
{
return $this->type;
}
/**
* returns the picture name
*
* @author - Olivier Brouckaert
* @return - string - picture name
*/
function selectPicture()
{
return $this->picture;
}
/**
* returns the array with the exercise ID list
*
* @author - Olivier Brouckaert
* @return - array - list of exercise ID which the question is in
*/
function selectExerciseList()
{
return $this->exerciseList;
}
/**
* returns the number of exercises which this question is in
*
* @author - Olivier Brouckaert
* @return - integer - number of exercises
*/
function selectNbrExercises()
{
return sizeof($this->exerciseList);
}
/**
* changes the question title
*
* @author - Olivier Brouckaert
* @param - string $title - question title
*/
function updateTitle($title)
{
$this->question=$title;
}
/**
* changes the question description
*
* @author - Olivier Brouckaert
* @param - string $description - question description
*/
function updateDescription($description)
{
$this->description=$description;
}
/**
* changes the question weighting
*
* @author - Olivier Brouckaert
* @param - integer $weighting - question weighting
*/
function updateWeighting($weighting)
{
$this->weighting=$weighting;
}
/**
* changes the question position
*
* @author - Olivier Brouckaert
* @param - integer $position - question position
*/
function updatePosition($position)
{
$this->position=$position;
}
/**
* changes the answer type. If the user changes the type from "unique answer" to "multiple answers"
* (or conversely) answers are not deleted, otherwise yes
*
* @author - Olivier Brouckaert
* @param - integer $type - answer type
*/
function updateType($type)
{
global $TBL_REPONSES;
// if we really change the type
if($type != $this->type)
{
// if we don't change from "unique answer" to "multiple answers" (or conversely)
if(!in_array($this->type,array(UNIQUE_ANSWER,MULTIPLE_ANSWER)) || !in_array($type,array(UNIQUE_ANSWER,MULTIPLE_ANSWER)))
{
// removes old answers
$sql="DELETE FROM `$TBL_REPONSES` WHERE question_id='".$this->id."'";
api_sql_query($sql,__FILE__,__LINE__);
}
$this->type=$type;
}
}
/**
* adds a picture to the question
*
* @author - Olivier Brouckaert
* @param - string $Picture - temporary path of the picture to upload
* @param - string $PictureName - Name of the picture
* @return - boolean - true if uploaded, otherwise false
*/
function uploadPicture($Picture,$PictureName)
{
global $picturePath;
// if the question has got an ID
if($this->id)
{
$PictureName=explode('.',$PictureName);
$Extension=$PictureName[sizeof($PictureName)-1];
$this->picture='quiz-'.$this->id.'.'.$Extension;
return move_uploaded_file($Picture,$picturePath.'/'.$this->picture)?true:false;
}
return false;
}
/**
* Resizes a picture || Warning!: can only be called after uploadPicture, or if picture is already available in object.
*
* @author - Toon Keppens
* @param - string $Dimension - Resizing happens proportional according to given dimension: height|width|any
* @param - integer $Max - Maximum size
* @return - boolean - true if success, false if failed
*/
function resizePicture($Dimension, $Max)
{
global $picturePath;
// if the question has an ID
if($this->id)
{
// Get dimensions from current image.
$current_img = imagecreatefromjpeg($picturePath.'/'.$this->picture);
$current_image_size = getimagesize($picturePath.'/'.$this->picture);
$current_height = imagesy($current_img);
$current_width = imagesx($current_img);
if($current_image_size[0] < $Max & & $current_image_size[1] < $Max)
return true;
elseif($current_height == "")
return false;
// Resize according to height.
if ($Dimension == "height")
{
$resize_scale = $current_height / $Max;
$new_height = $Max;
$new_width = ceil($current_width / $resize_scale);
}
// Resize according to width
if ($Dimension == "width")
{
$resize_scale = $current_width / $Max;
$new_width = $Max;
$new_height = ceil($current_height / $resize_scale);
}
// Resize according to height or width, both should not be larger than $Max after resizing.
if ($Dimension == "any")
{
if ($current_height > $current_width || $current_height == $current_width)
{
$resize_scale = $current_height / $Max;
$new_height = $Max;
$new_width = ceil($current_width / $resize_scale);
}
if ($current_height < $current_width)
{
$resize_scale = $current_width / $Max;
$new_width = $Max;
$new_height = ceil($current_height / $resize_scale);
}
}
// Create new image
$new_img = imagecreatetruecolor($new_width, $new_height);
$bgColor = imagecolorallocate($new_img, 255,255,255);
imagefill($new_img , 0,0 , $bgColor);
// Resize image
imagecopyresized($new_img, $current_img, 0, 0, 0, 0, $new_width, $new_height, $current_width, $current_height);
// Write image to file
$result = imagejpeg($new_img, $picturePath.'/'.$this->picture, 100);
// Delete temperory images, clear memory
imagedestroy($current_img);
imagedestroy($new_img);
if ($result)
{
return true;
}
else
{
return false;
}
}
}
/**
* deletes the picture
*
* @author - Olivier Brouckaert
* @return - boolean - true if removed, otherwise false
*/
function removePicture()
{
global $picturePath;
// if the question has got an ID and if the picture exists
if($this->id)
{
$picture=$this->picture;
$this->picture='';
return @unlink($picturePath.'/'.$picture)?true:false;
}
return false;
}
/**
* exports a picture to another question
*
* @author - Olivier Brouckaert
* @param - integer $questionId - ID of the target question
* @return - boolean - true if copied, otherwise false
*/
function exportPicture($questionId)
{
global $TBL_QUESTIONS, $picturePath;
// if the question has got an ID and if the picture exists
if($this->id & & !empty($this->picture))
{
$picture=explode('.',$this->picture);
$Extension=$picture[sizeof($picture)-1];
$picture='quiz-'.$questionId.'.'.$Extension;
$sql="UPDATE `$TBL_QUESTIONS` SET picture='$picture' WHERE id='$questionId'";
api_sql_query($sql,__FILE__,__LINE__);
return @copy($picturePath.'/'.$this->picture,$picturePath.'/'.$picture)?true:false;
}
return false;
}
/**
* saves the picture coming from POST into a temporary file
* Temporary pictures are used when we don't want to save a picture right after a form submission.
* For example, if we first show a confirmation box.
*
* @author - Olivier Brouckaert
* @param - string $Picture - temporary path of the picture to move
* @param - string $PictureName - Name of the picture
*/
function setTmpPicture($Picture,$PictureName)
{
global $picturePath;
$PictureName=explode('.',$PictureName);
$Extension=$PictureName[sizeof($PictureName)-1];
// saves the picture into a temporary file
@move_uploaded_file($Picture,$picturePath.'/tmp.'.$Extension);
}
/**
* moves the temporary question "tmp" to "quiz-$questionId"
* Temporary pictures are used when we don't want to save a picture right after a form submission.
* For example, if we first show a confirmation box.
*
* @author - Olivier Brouckaert
* @return - boolean - true if moved, otherwise false
*/
function getTmpPicture()
{
global $picturePath;
// if the question has got an ID and if the picture exists
if($this->id)
{
if(file_exists($picturePath.'/tmp.jpg'))
{
$Extension='jpg';
}
elseif(file_exists($picturePath.'/tmp.gif'))
{
$Extension='gif';
}
elseif(file_exists($picturePath.'/tmp.png'))
{
$Extension='png';
}
$this->picture='quiz-'.$this->id.'.'.$Extension;
return @rename($picturePath.'/tmp.'.$Extension,$picturePath.'/'.$this->picture)?true:false;
}
return false;
}
/**
* updates the question in the data base
* if an exercise ID is provided, we add that exercise ID into the exercise list
*
* @author - Olivier Brouckaert
* @param - integer $exerciseId - exercise ID if saving in an exercise
*/
function save($exerciseId=0)
{
global $TBL_QUESTIONS, $_course;
$id=$this->id;
$question=addslashes($this->question);
$description=addslashes($this->description);
$weighting=$this->weighting;
$position=$this->position;
$type=$this->type;
$picture=addslashes($this->picture);
// question already exists
if($id)
{
$sql="UPDATE `$TBL_QUESTIONS` SET question='$question',description='$description',ponderation='$weighting',position='$position',type='$type',picture='$picture' WHERE id='$id'";
api_sql_query($sql,__FILE__,__LINE__);
}
// creates a new question
else
{
$sql="INSERT INTO `$TBL_QUESTIONS`(question,description,ponderation,position,type,picture) VALUES('$question','$description','$weighting','$position','$type','$picture')";
api_sql_query($sql,__FILE__,__LINE__);
$this->id=mysql_insert_id();
// If hotspot, create first answer
if ($type == HOT_SPOT || $type == HOT_SPOT_ORDER) {
$TBL_ANSWERS = $_course['dbNameGlu'].'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;
}
}
endif;
?>
