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Diffstat (limited to 'renderer.php')
| -rw-r--r-- | renderer.php | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/renderer.php b/renderer.php new file mode 100644 index 0000000..4ffe674 --- /dev/null +++ b/renderer.php @@ -0,0 +1,162 @@ +<?php +// This file is part of Moodle - http://moodle.org/ +// +// Moodle 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 3 of the License, or +// (at your option) any later version. +// +// Moodle is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with Moodle. If not, see <http://www.gnu.org/licenses/>. + +/** + * Algebra question renderer class. + * + * @package qtype + * @subpackage algebra + * @author Roger Moore <rwmoore 'at' ualberta.ca> + * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later + */ + + +defined('MOODLE_INTERNAL') || die(); + + +/** + * Generates the output for algebra questions. + * + * @copyright 2009 The Open University + * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later + */ +class qtype_algebra_renderer extends qtype_renderer { + public function formulation_and_controls(question_attempt $qa, + question_display_options $options) { + global $CFG; + + $question = $qa->get_question(); + + $currentanswer = $qa->get_last_qt_var('answer'); + + $inputname = $qa->get_qt_field_name('answer'); + + $nameprefix = str_replace(':', '_', $inputname); // valid javascript name + $inputattributes = array( + 'type' => 'text', + 'name' => $inputname, + 'value' => $currentanswer, + 'id' => $inputname, + 'size' => 80, + ); + + if ($options->readonly) { + $inputattributes['readonly'] = 'readonly'; + } + + $feedbackimg = ''; + if ($options->correctness) { + $answer = $question->get_matching_answer(array('answer' => $currentanswer)); + if ($answer) { + $fraction = $answer->fraction; + } else { + $fraction = 0; + } + $inputattributes['class'] = $this->feedback_class($fraction); + $feedbackimg = $this->feedback_image($fraction); + } + + $iframename = $nameprefix.'_if'; + // Name of the javascript function which causes the entered formula to be rendered + $df_name = $nameprefix.'_display'; + // Create an array of variable names to use when displaying the function entered + $varnames=array(); + if($question and isset($question->variables)) { + $variables = $question->variables; + foreach($question->variables as $var) { + $varnames[]=$var->name; + } + } + + $varnames=implode(',',$varnames); + // Javascript function which the button uses to display the rendering + // This function sents the source of the iframe to the 'displayformula.php' script giving + // it an argument of the formula entered by the student. + $displayfunction = + 'function '.$df_name."() {\n". + ' var text="vars='.$varnames.'&expr="+escape(document.getElementsByName("'.$inputname.'")[0].value);'."\n". + " if(text.length != 0) {\n". + ' document.getElementsByName("'.$iframename.'")[0].src="'. + $CFG->wwwroot.'/question/type/algebra/displayformula.php?"+'. + 'text.replace(/\+/g,"%2b")'."\n". + " }\n". + " }\n"; + + $questiontext = $question->format_questiontext($qa); + + $input = html_writer::empty_tag('input', $inputattributes) . $feedbackimg; + + + $result = html_writer::tag('div', $questiontext, array('class' => 'qtext')); + + $result .= html_writer::tag('script', $displayfunction, array('type'=>'text/javascript')); + + $result .= html_writer::start_tag('div', array('class' => 'ablock')); + $result .= html_writer::start_tag('div', array('class' => 'prompt', 'style' => 'vertical-align: top')); + if(isset($question->answerprefix) and !empty($question->answerprefix)) { + $opts=new StdClass; + $opts->para=false; + $result .= html_writer::tag('div', format_text($question->answerprefix,FORMAT_MOODLE,$opts).$input, array('class' => 'answer')); + } else { + $result .= get_string('answer', 'qtype_algebra', + html_writer::tag('div', $input, array('class' => 'answer'))); + } + $result .= html_writer::end_tag('div'); + + $result .= html_writer::end_tag('div'); + + + if ($qa->get_state() == question_state::$invalid) { + $result .= html_writer::nonempty_tag('div', + $question->get_validation_error(array('answer' => $currentanswer)), + array('class' => 'validationerror')); + } + $result .= html_writer::start_tag('div', array('class' => 'dispresponse')); + $result .= html_writer::empty_tag('input', array('type'=>'button', 'value'=>'Display Response', 'onclick'=>$df_name.'()')); + $result .= html_writer::start_tag('iframe', array('name'=>$iframename, 'width'=>'60%', 'height'=>60, 'align'=>'middle', 'src'=>'')); + $result .= html_writer::end_tag('iframe'); + $result .= html_writer::tag('script', $df_name.'();', array('type'=>'text/javascript')); + $result .= html_writer::end_tag('div'); + + return $result; + } + + public function specific_feedback(question_attempt $qa) { + $question = $qa->get_question(); + + $answer = $question->get_matching_answer(array('answer' => $qa->get_last_qt_var('answer'))); + if (!$answer || !$answer->feedback) { + return ''; + } + + return $question->format_text($answer->feedback, $answer->feedbackformat, + $qa, 'question', 'answerfeedback', $answer->id); + } + + public function correct_response(question_attempt $qa) { + $question = $qa->get_question(); + + $answer = $question->get_matching_answer($question->get_correct_response()); + if (!$answer) { + return ''; + } + $formatoptions = new stdClass; + $formatoptions->para = false; + $formatoptions->clean = false; + $formattedanswer = format_text($question->formated_expression($answer->answer), FORMAT_MOODLE, $formatoptions); + return get_string('correctansweris', 'qtype_algebra', s($answer->answer)). $formattedanswer; + } +}
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