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<?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/>.
/**
* Common functions for the quiz statistics report.
*
* @package quiz_statistics
* @copyright 2013 The Open University
* @author James Pratt me@jamiep.org
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die;
/**
* SQL to fetch relevant 'quiz_attempts' records.
*
* @param int $quizid quiz id to get attempts for
* @param \core\dml\sql_join $groupstudentsjoins Contains joins, wheres, params, empty if not using groups
* @param string $whichattempts which attempts to use, represented internally as one of the constants as used in
* $quiz->grademethod ie.
* QUIZ_GRADEAVERAGE, QUIZ_GRADEHIGHEST, QUIZ_ATTEMPTLAST or QUIZ_ATTEMPTFIRST
* we calculate stats based on which attempts would affect the grade for each student.
* @param bool $includeungraded whether to fetch ungraded attempts too
* @return array FROM and WHERE sql fragments and sql params
*/
function quiz_statistics_attempts_sql($quizid, \core\dml\sql_join $groupstudentsjoins,
$whichattempts = QUIZ_GRADEAVERAGE, $includeungraded = false) {
$fromqa = "{quiz_attempts} quiza ";
$whereqa = 'quiza.quiz = :quizid AND quiza.preview = 0 AND quiza.state = :quizstatefinished';
$qaparams = array('quizid' => (int)$quizid, 'quizstatefinished' => quiz_attempt::FINISHED);
if (!empty($groupstudentsjoins->joins)) {
$fromqa .= "\nJOIN {user} u ON u.id = quiza.userid
{$groupstudentsjoins->joins} ";
$whereqa .= " AND {$groupstudentsjoins->wheres}";
$qaparams += $groupstudentsjoins->params;
}
$whichattemptsql = quiz_report_grade_method_sql($whichattempts);
if ($whichattemptsql) {
$whereqa .= ' AND ' . $whichattemptsql;
}
if (!$includeungraded) {
$whereqa .= ' AND quiza.sumgrades IS NOT NULL';
}
return array($fromqa, $whereqa, $qaparams);
}
/**
* Return a {@link qubaid_condition} from the values returned by {@link quiz_statistics_attempts_sql}.
*
* @param int $quizid
* @param \core\dml\sql_join $groupstudentsjoins Contains joins, wheres, params
* @param string $whichattempts which attempts to use, represented internally as one of the constants as used in
* $quiz->grademethod ie.
* QUIZ_GRADEAVERAGE, QUIZ_GRADEHIGHEST, QUIZ_ATTEMPTLAST or QUIZ_ATTEMPTFIRST
* we calculate stats based on which attempts would affect the grade for each student.
* @param bool $includeungraded
* @return \qubaid_join
*/
function quiz_statistics_qubaids_condition($quizid, \core\dml\sql_join $groupstudentsjoins,
$whichattempts = QUIZ_GRADEAVERAGE, $includeungraded = false) {
list($fromqa, $whereqa, $qaparams) = quiz_statistics_attempts_sql(
$quizid, $groupstudentsjoins, $whichattempts, $includeungraded);
return new qubaid_join($fromqa, 'quiza.uniqueid', $whereqa, $qaparams);
}
/**
* This helper function returns a sequence of colours each time it is called.
* Used for choosing colours for graph data series.
* @return string colour name.
* @deprecated since Moodle 3.2
*/
function quiz_statistics_graph_get_new_colour() {
debugging('The function quiz_statistics_graph_get_new_colour() is deprecated, please do not use it any more. '
. 'Colours will be handled by the charting library directly.', DEBUG_DEVELOPER);
static $colourindex = -1;
$colours = array('red', 'green', 'yellow', 'orange', 'purple', 'black',
'maroon', 'blue', 'ltgreen', 'navy', 'ltred', 'ltltgreen', 'ltltorange',
'olive', 'gray', 'ltltred', 'ltorange', 'lime', 'ltblue', 'ltltblue');
$colourindex = ($colourindex + 1) % count($colours);
return $colours[$colourindex];
}