/**
* Creates a Problem.
* @param $type Problem type: 'text', 'equation', ... ?
* @param $content An xml string with the problem content. The format depends on the $type.
*/
public static function create($type, $content)
{
if ($type == 'text') {
return ProblemFactory::createText($content);
}
throw new Exception("Problem type {$type} is undefined.");
}
function testTextProblem()
{
$content = '<problem><text>Problem question.</text><answer>The answer.</answer></problem>';
$p = ProblemFactory::create('text', $content);
$txt = $p->getText();
echo "text={$txt}\nans={$p->answer}\n";
$this->assertEqual($p->getText(), 'Problem question.');
$this->assertEqual($p->answer, 'The answer.');
}
/**
* Initializes the inputs with existing post data.
* This method is invoked by the framework when the page is being initialized.
* @param mixed event parameter
*/
public function onInit($param)
{
parent::onInit($param);
// Retrieves the existing user data. This is equivalent to:
// $postRecord=$this->getPost();
$problemRecord = $this->Problem;
// Authorization check: only the author or the administrator can edit the post
//if($postRecord->author_id!==$this->User->Name && !$this->User->IsAdmin)
// throw new THttpException(500,'You are not allowed to edit this post.');
if (!$this->IsPostBack) {
// Populates the input controls with the existing post data
$p = ProblemFactory::create($problemRecord->problem_type, $problemRecord->content);
$this->TextEdit->Text = $p->getText();
$this->AnswerEdit->Text = $p->answer;
}
}
public function define()
{
$p = ProblemFactory::newProblem("Test");
$x = $p->variable('X', 1, 10);
$y = $p->variable('Y', 1, 10);
$z = $p->variable('Z', 1, 10);
$r = $p->variable('R', 1, 10);
$vars = array($x, $y, $z, $r);
$p->post($x, '<', $y);
$p->post($z, '>', 4);
$p->post($x->plus($y), '=', $z);
$p->postAllDifferent($vars);
$coef1 = array(3, 4, -5, 2);
$p->post($coef1, $vars, '>', 0);
$p->post($vars, '>=', 15);
$coef2 = array(2, -4, 5, 1);
$p->post($coef2, $vars, '>', $x->multiply($y));
$this->problem = $p;
$this->data = $vars;
}
public function getText()
{
$p = ProblemFactory::create($this->Data->problem_type, $this->Data->content);
return $p->getText();
}
