protected static function ensure_fraction_options_initialised() {
if (!is_null(self::$fractionoptions)) {
return;
}
// define basic array of grades. This list comprises all fractions of the form:
// a. p/q for q <= 6, 0 <= p <= q
// b. p/10 for 0 <= p <= 10
// c. 1/q for 1 <= q <= 10
// d. 1/20
$rawfractions = array(
0.9000000,
0.8333333,
0.8000000,
0.7500000,
0.7000000,
0.6666667,
0.6000000,
0.5000000,
0.4000000,
0.3333333,
0.3000000,
0.2500000,
0.2000000,
0.1666667,
0.1428571,
0.1250000,
0.1111111,
0.1000000,
0.0500000,
);
// Put the None option at the top.
self::$fractionoptions = array(
'0.0' => get_string('none'),
'1.0' => '100%',
);
self::$fractionoptionsfull = array(
'0.0' => get_string('none'),
'1.0' => '100%',
);
// The the positive grades in descending order.
foreach ($rawfractions as $fraction) {
$percentage = (100 * $fraction) . '%';
self::$fractionoptions["$fraction"] = $percentage;
self::$fractionoptionsfull["$fraction"] = $percentage;
}
// The the negative grades in descending order.
foreach (array_reverse($rawfractions) as $fraction) {
self::$fractionoptionsfull['' . (-$fraction)] = (-100 * $fraction) . '%';
}
self::$fractionoptionsfull['-1.0'] = '-100%';
}
