85 lines
2.2 KiB
PHP
85 lines
2.2 KiB
PHP
<?php
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require_once "PicturedTask.php";
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class SingleChoiceTask extends PicturedTask
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{
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private array $answers; // possible answers
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// -----------------
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function __construct(array $a = null)
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{
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parent::__construct("singlechoice", $a);
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$this->answers = $a["answers"] ?? [];
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$ca = $a["correct_answer"] ?? -1;
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if (gettype($ca) === "string") { // backward compatibility
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$this->correct_answer = array_search($a["correct_answer"], $this->answers);
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} else {
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$this->correct_answer = (int)($ca);
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}
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$this->player_answer = $a["player_answer"] ?? -1;
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}
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function addAnswer(string $answer): void
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{
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$this->answers[] = $answer;
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}
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function getAnswers(): array
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{
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return $this->answers;
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}
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private function isAnswerIdInsideBounds($ansid): bool
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{
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return ($ansid >= 0) && ($ansid <= count($this->answers));
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}
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function saveAnswer(mixed $ans): bool
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{
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$ansidx = (int)($ans); // cast answer to integer as it is a number
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if ($this->isAnswerIdInsideBounds($ansidx)) {
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$this->player_answer = $ansidx;
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return true;
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}
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return false;
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}
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function clearAnswer(): void
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{
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$this->player_answer = -1;
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}
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public function getMark(): float
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{
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return ($this->player_answer == $this->correct_answer) ? 1.0 : 0.0;
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}
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function toArray(): array
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{
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$a = parent::toArray();
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$a["answers"] = $this->answers;
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$a["correct_answer"] = $this->correct_answer;
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return $a;
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}
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function randomize(): void{
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$ordering = range(0, count($this->answers) - 1); // create an ordered range
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shuffle($ordering); // shuffle indices
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$shans = [];
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$ca_remapped = false; // avoid remapping the correct answer multiple times
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for ($i = 0; $i < count($this->answers); $i++) { // shuffle answers
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$orig_pos = $ordering[$i];
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$shans[] = $this->answers[$orig_pos];
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if ((!$ca_remapped) && ($orig_pos == $this->correct_answer)) {
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$this->correct_answer = $i;
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$ca_remapped = true;
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}
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}
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$this->answers = $shans;
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}
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} |