private void UpdatePicture()
{
int failedAttempts = _backend.GetFailedAttempts();
int totalAttempts = _backend.GetAllowedAttempts();
if (failedAttempts >= totalAttempts)
{
// Show last picture
image.Source = pictures.Last();
}
else
{
int percentage = failedAttempts / totalAttempts * 10;
// Show the picture that matches the closest picture id from the percentage between failedAttempts and totalAttempts
// Show the picture.
image.Source = pictures[percentage];
}
}