public Question NextQuestion()
{
QuizStats stats = CalcStats();
Question newQuestion = null;
QuestionStatus targetStatus;
int targetIndex;
int count = 20;
do
{
if (stats.CountRight > 0 && random.NextDouble() < 0.3)
{
// 30% chance to review one we know.
targetStatus = QuestionStatus.Right;
targetIndex = random.Next(stats.CountRight);
}
else if (stats.CountWrong + stats.CountPartial < 3 && stats.CountUnseen > 0 && random.NextDouble() < 0.5)
{
// If we have < 3 that we don't know, add a new one in.
targetStatus = QuestionStatus.NotSeen;
targetIndex = random.Next(stats.CountUnseen);
}
else if (random.Next(2 * stats.CountWrong + stats.CountPartial) < 2 * stats.CountWrong)
{
// Choose a question we don't know yet, with wrong weighted twice as partial.
targetStatus = QuestionStatus.Wrong;
targetIndex = random.Next(stats.CountWrong);
}
else
{
targetStatus = QuestionStatus.Partial;
targetIndex = random.Next(stats.CountPartial);
}
foreach (Question q in questions)
{
QuestionStatus status = q.Status;
if (status == targetStatus)
{
if (targetIndex == 0)
{
newQuestion = q;
break;
}
else
{
--targetIndex;
}
}
}
if (newQuestion == null)
{
newQuestion = questions[random.Next(questions.Count)];
}
} while (newQuestion == lastQuestion && count-- > 0); // Don't repeat the same question in a row unless we must.
lastQuestion = newQuestion;
return(newQuestion);
}
private void UpdateStatusGrid(QuizStats stats)
{
statusGrid.ColumnDefinitions[0].Width = new GridLength(stats.CountUnseen, GridUnitType.Star);
statusGrid.ColumnDefinitions[1].Width = new GridLength(stats.CountWrong, GridUnitType.Star);
statusGrid.ColumnDefinitions[2].Width = new GridLength(stats.CountPartial, GridUnitType.Star);
statusGrid.ColumnDefinitions[3].Width = new GridLength(stats.CountRight, GridUnitType.Star);
}
void Done()
{
quizGrid.Visibility = Visibility.Hidden;
doneGrid.Visibility = Visibility.Visible;
QuizStats stats = quiz.CalcStats();
resultsText.Text = string.Format("Known: {0}\r\nPartially Known: {1}\r\nNot known: {2}\r\nNot seen: {3}", stats.CountRight, stats.CountPartial, stats.CountWrong, stats.CountUnseen);
}
public QuizStats CalcStats()
{
QuizStats stats = new QuizStats();
foreach (Question q in questions) {
QuestionStatus status = q.Status;
switch (status) {
case QuestionStatus.NotSeen: stats.CountUnseen++; break;
case QuestionStatus.Wrong: stats.CountWrong++; break;
case QuestionStatus.Partial: stats.CountPartial++; break;
case QuestionStatus.Right: stats.CountRight++; break;
}
}
stats.Total = questions.Count;
return stats;
}
void PresentNextQuestion()
{
if (timeLimit != default(TimeSpan) && DateTime.Now > finishTime)
{
Done();
return;
}
quiz.SaveAnswers();
QuizStats stats = quiz.CalcStats();
UpdateStatusGrid(stats);
// statusLabel.Content = string.Format("{0} of {1} known", stats.CountRight, stats.Total);
question = quiz.NextQuestion();
ShowQuestion();
AllowAnswerEntry();
}
public QuizStats CalcStats()
{
QuizStats stats = new QuizStats();
foreach (Question q in questions)
{
QuestionStatus status = q.Status;
switch (status)
{
case QuestionStatus.NotSeen: stats.CountUnseen++; break;
case QuestionStatus.Wrong: stats.CountWrong++; break;
case QuestionStatus.Partial: stats.CountPartial++; break;
case QuestionStatus.Right: stats.CountRight++; break;
}
}
stats.Total = questions.Count;
return(stats);
}
