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281 lines
12 KiB
281 lines
12 KiB
<?php
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/* For licensing terms, see /license.txt */
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use Webit\Util\EvalMath\EvalMath;
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/**
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* Class CalculatedAnswer
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* This class contains calculated answer form and answer processing functions
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*
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* @author Imanol Losada
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* @package chamilo.exercise
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**/
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class CalculatedAnswer extends Question
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{
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public static $typePicture = 'calculated_answer.png';
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public static $explanationLangVar = 'CalculatedAnswer';
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/**
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* Constructor
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*/
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public function __construct()
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{
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parent::__construct();
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$this->type = CALCULATED_ANSWER;
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$this->isContent = $this->getIsContent();
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}
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/**
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* function which redefines Question::createAnswersForm
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* @param FormValidator $form
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*/
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public function createAnswersForm($form)
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{
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$defaults = array();
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if (!empty($this->id)) {
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$objAnswer = new Answer($this->id);
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$preArray = explode('@@', $objAnswer->selectAnswer(1));
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$defaults['formula'] = array_pop($preArray);
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$defaults['answer'] = array_shift($preArray);
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$defaults['answer'] = preg_replace("/\[.*\]/", "", $defaults['answer']);
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$defaults['weighting'] = $this->weighting;
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} else {
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$defaults['answer'] = get_lang('DefaultTextInBlanks');
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}
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$lowestValue = "1.00";
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$highestValue = "20.00";
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// javascript //
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echo '<script>
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function parseTextNumber(textNumber, floatValue) {
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if (textNumber.indexOf(".") > -1) {
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textNumber = parseFloat(textNumber);
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floatValue.exists = "true";
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} else {
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textNumber = parseInt(textNumber);
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}
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return textNumber;
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}
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function updateRandomValue(element) {
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// "floatValue" helps to distinguish between an integer (10) and a float with all 0 decimals (10.00)
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var floatValue = { exists: "false" };
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var index = (element.name).match(/\[[^\]]*\]/g);
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var lowestValue = parseTextNumber(document.getElementById("lowestValue"+index).value, floatValue);
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var highestValue = parseTextNumber(document.getElementById("highestValue"+index).value, floatValue);
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var result = Math.random() * (highestValue - lowestValue) + lowestValue;
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if (floatValue.exists == "true") {
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result = parseFloat(result).toFixed(2);
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} else {
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result = parseInt(result);
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}
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document.getElementById("randomValue"+index).innerHTML = "'.get_lang("ExampleValue").': " + result;
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}
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CKEDITOR.on("instanceCreated", function(e) {
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if (e.editor.name === "answer") {
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e.editor.on("change", updateBlanks);
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}
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});
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var firstTime = true;
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function updateBlanks(e) {
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if (firstTime) {
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field = document.getElementById("answer");
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var answer = field.value;
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} else {
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var answer = e.editor.getData();
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}
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var blanks = answer.match(/\[[^\]]*\]/g);
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var fields = "<div class=\"form-group\"><label class=\"col-sm-2\">'.get_lang('VariableRanges').'</label><div class=\"col-sm-8\"><table>";
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if (blanks!=null) {
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if (typeof updateBlanks.randomValues === "undefined") {
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updateBlanks.randomValues = [];
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}
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for (i=0 ; i<blanks.length ; i++){
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if (document.getElementById("lowestValue["+i+"]") && document.getElementById("highestValue["+i+"]")) {
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lowestValue = document.getElementById("lowestValue["+i+"]").value;
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highestValue = document.getElementById("highestValue["+i+"]").value;
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} else {
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lowestValue = '.$lowestValue.'.toFixed(2);
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highestValue = '.$highestValue.'.toFixed(2);
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for (j=0; j<blanks.length; j++) {
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updateBlanks.randomValues[j] = parseFloat(Math.random() * (highestValue - lowestValue) + lowestValue).toFixed(2);
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}
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}
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fields += "<tr><td><label>"+blanks[i]+"</label></td><td><input class=\"span1\" style=\"margin-left: 0em;\" size=\"5\" value=\""+lowestValue+"\" type=\"text\" id=\"lowestValue["+i+"]\" name=\"lowestValue["+i+"]\" onblur=\"updateRandomValue(this)\"/></td><td><input class=\"span1\" style=\"margin-left: 0em; width:80px;\" size=\"5\" value=\""+highestValue+"\" type=\"text\" id=\"highestValue["+i+"]\" name=\"highestValue["+i+"]\" onblur=\"updateRandomValue(this)\"/></td><td><label class=\"span3\" id=\"randomValue["+i+"]\"/>'.get_lang('ExampleValue').': "+updateBlanks.randomValues[i]+"</label></td></tr>";
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}
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}
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document.getElementById("blanks_weighting").innerHTML = fields + "</table></div></div>";
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if (firstTime) {
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firstTime = false;
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}
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}
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window.onload = updateBlanks;
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</script>';
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// answer
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$form->addElement('label', null, '<br /><br />'.get_lang('TypeTextBelow').', '.get_lang('And').' '.get_lang('UseTagForBlank'));
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$form->addElement(
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'html_editor',
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'answer',
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Display::return_icon('fill_field.png'),
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array(
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'id' => 'answer',
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'onkeyup' => 'javascript: updateBlanks(this);'
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),
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array('ToolbarSet' => 'TestQuestionDescription', 'Width' => '100%', 'Height' => '350'));
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$form->addRule('answer', get_lang('GiveText'),'required');
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$form->addRule('answer', get_lang('DefineBlanks'),'regex','/\[.*\]/');
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$form->addElement('label', null, get_lang('IfYouWantOnlyIntegerValuesWriteBothLimitsWithoutDecimals'));
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$form->addElement('html', '<div id="blanks_weighting"></div>');
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$notationListButton = Display::url(
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get_lang('NotationList'),
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api_get_path(WEB_PATH).'main/exercice/evalmathnotation.php',
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array(
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'class' => 'btn btn-info ajax',
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'data-title' => get_lang('NotationList'),
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'_target' => '_blank'
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)
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);
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$form->addElement(
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'label',
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null,
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$notationListButton
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);
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$form->addElement('label', null, get_lang('FormulaExample'));
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$form->addElement('text', 'formula', get_lang('Formula'), array('id' => 'formula'));
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$form->addRule('formula', get_lang('GiveFormula'), 'required');
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$form->addElement('text', 'weighting', get_lang('Weighting'), array('id' => 'weighting'));
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$form->setDefaults(array('weighting' => '10'));
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$form->addElement('text', 'answerVariations', get_lang('AnswerVariations'));
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$form->addRule('answerVariations', get_lang('GiveAnswerVariations'),'required');
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$form->setDefaults(array('answerVariations' => '1'));
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global $text;
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// setting the save button here and not in the question class.php
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$form->addButtonSave($text, 'submitQuestion');
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if (!empty($this->id)) {
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$form -> setDefaults($defaults);
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} else {
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if ($this->isContent == 1) {
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$form->setDefaults($defaults);
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}
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}
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}
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/**
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* abstract function which creates the form to create / edit the answers of the question
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* @param FormValidator $form
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*/
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public function processAnswersCreation($form)
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{
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if (!self::isAnswered()) {
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$table = Database::get_course_table(TABLE_QUIZ_ANSWER);
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Database::delete(
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$table,
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array(
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'c_id = ? AND question_id = ?' => array(
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$this->course['real_id'],
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$this->id
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)
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)
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);
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$answer = $form->getSubmitValue('answer');
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$formula = $form->getSubmitValue('formula');
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$lowestValues = $form->getSubmitValue('lowestValue');
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$highestValues = $form->getSubmitValue('highestValue');
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$answerVariations = $form->getSubmitValue('answerVariations');
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$this->weighting = $form->getSubmitValue('weighting');
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// Create as many answers as $answerVariations
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for ($j=0 ; $j < $answerVariations; $j++) {
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$auxAnswer = $answer;
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$auxFormula = $formula;
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$nb = preg_match_all('/\[[^\]]*\]/', $auxAnswer, $blanks);
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if ($nb > 0) {
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for ($i=0 ; $i < $nb; ++$i) {
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$blankItem = $blanks[0][$i];
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$replace = array("[", "]");
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$newBlankItem = str_replace($replace, "", $blankItem);
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$newBlankItem = "[".trim($newBlankItem)."]";
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// take random float values when one or both edge values have a decimal point
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$randomValue =
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(strpos($lowestValues[$i],'.') !== false ||
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strpos($highestValues[$i],'.') !== false) ?
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mt_rand($lowestValues[$i]*100,$highestValues[$i]*100)/100 :
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mt_rand($lowestValues[$i],$highestValues[$i]);
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$auxAnswer = str_replace($blankItem, $randomValue, $auxAnswer);
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$auxFormula = str_replace($blankItem, $randomValue, $auxFormula);
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}
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$math = new EvalMath();
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$result = $math->evaluate($auxFormula);
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$result = number_format($result, 2, ".", "");
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// Remove decimal trailing zeros
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$result = rtrim($result, "0");
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// If it is an integer (ends in .00) remove the decimal point
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if (mb_substr($result, -1) === ".") {
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$result = str_replace(".", "", $result);
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}
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// Attach formula
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$auxAnswer .= " [".$result."]@@".$formula;
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}
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$this->save();
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$objAnswer = new Answer($this->id);
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$objAnswer->createAnswer($auxAnswer, 1, '', $this->weighting, '');
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$objAnswer->position = array();
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$objAnswer->save();
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}
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}
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}
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/**
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* @param null $feedback_type
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* @param null $counter
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* @param null $score
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* @return null|string
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*/
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public function return_header($feedback_type = null, $counter = null, $score = null)
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{
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$header = parent::return_header($feedback_type, $counter, $score);
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$header .= '<table class="'.$this->question_table_class .'">
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<tr>
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<th>'.get_lang("Answer").'</th>
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</tr>';
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return $header;
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}
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/**
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* Returns true if the current question has been attempted to be answered
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* @return boolean
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*/
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public function isAnswered()
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{
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$table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
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$result = Database::select(
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'question_id',
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$table,
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array(
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'where' => array(
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'question_id = ? AND c_id = ?' => array(
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$this->id,
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$this->course['real_id']
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)
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)
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)
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);
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return empty($result) ? false : true;
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}
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}
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