fillin exercise in PDF: bug with underlining?
Sean Fitzpatrick
I am noticing that in PDF output, exercises with fillin sometimes get an answer blank that is underlined, and sometimes the underline is not there.
I am not sure why, since the .tex source is the same in each case, but not the PDF output.
Examples:
Here is an exercise in .ptx source:
<exercise label="TaC-antiderivatives-4">
<statement>
<p>
Fill in the blanks:
<q>Inverse operations do the <fillin
answer="opposite" width="20"/>
things in the <fillin answer="opposite"
width="20"/> order.</q>
</p>
</statement>
<evaluation>
<evaluate>
<test correct="yes">
<strcmp
case="insensitive">opposite|reverse</strcmp>
</test>
</evaluate>
<evaluate>
<test correct="yes">
<strcmp
case="insensitive">opposite|reverse</strcmp>
</test>
</evaluate>
</evaluation>
</exercise>
It produces the following .tex:
\begin{divisionexercise}{4}{}{}{TaC-antiderivatives-4}%
Fill in the blanks: \textquotedblleft{}Inverse operations do the
\fillintext{20} things in the \fillintext{20}
order.\textquotedblright{}%
\end{divisionexercise}%
And in PDF, it appears thus:
In this case, we get underlines. But here is another example. The .ptx source is
<exercise label="TaC-lHospitals-rule-5">
<statement>
<p>
Fill in the blanks: The Quotient Rule is applied
to
<m>\ds \frac{f(x)}{g(x)}</m> when
taking <fillin width="20" answer="derivatives"/>;
l'Hospital's Rule is applied when taking certain
<fillin width="20" answer="limits"/>.
</p>
</statement>
<evaluation>
<evaluate>
<test correct="yes">
<strcmp case="insensitive">a
derivative|derivatives?</strcmp>
</test>
<test>
<strcmp use-answer="yes" strip="no" />
<feedback>
<p>
Your answer includes the correct word but
has extra text.
</p>
</feedback>
</test>
</evaluate>
<evaluate>
<test correct="yes">
<strcmp
case="insensitive">limits?</strcmp>
</test>
<test>
<strcmp use-answer="yes" strip="no" />
<feedback>
<p>
Your answer includes the correct word but
has extra text.
</p>
</feedback>
</test>
</evaluate>
</evaluation>
</exercise>
The .tex produced is:
\begin{divisionexercise}{5}{}{}{TaC-lHospitals-rule-5}%
Fill in the blanks: The Quotient Rule is applied to \(\ds
\frac{f(x)}{g(x)}\) when taking \fillintext{20}; l'Hospital's Rule
is applied when taking certain \fillintext{20}.%
\end{divisionexercise}%
This seems like the same result! But in PDF, there is no underline:
Seems like a TeX (XeLaTeX) bug? Or something else? I don't see any difference in .ptx or .tex source that explains why one gets underlined and the other does not.
Sean Fitzpatrick
Sorry, I think it is a false alarm.
All the blanks get underlined, but which underlines show up depends on the zoom level.
What is weird is that I have one exercise set where there are two questions on the same page, using fillin blanks of the same length. The underlining shows up for one but not the other. But if I zoom in, both are there.
Oscar Levin
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Sean Fitzpatrick
My only remaining concern comes from my experience with the Ricoh printer in our department.
Last term I had weekly quizzes with an \hrule near the top. Sometimes it printed, sometimes it didn't.
PDF is not as immutable as we were led to believe!
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