|
PGchoicemacros.pl --- located in the courseScripts directory
There are two types of choice macros. The older versions are simply scripts.
The newer versions involve the "List.pm" class and its sub-classes
and the use of objects based on these classes. The list sub-classes are:
"Match.pm" which aids in setting up matching question
and answer lists, "Select.pm" which aids in selecting
and presenting a subset of questions with short answers
(e.g. true/false questions) from a larger question set, and
"Multiple.pm" which aids in setting up a
standard style, one question, many answers type multiple
choice question.
Sample usage:
$ml = new_match_list();
# enter three questions and their answers
$ml->qa( "What color is a rose?",
"Red",
"What color is the sky?",
"Blue",
"What color is the sea?",
"Green"
);
# choose two of these questions, ordered at random,
# which will be printed in the problem.
$ml->choose(2);
BEGIN_TEXT
Match the answers below with these questions:$BR
\\{$ml->print_q\\} $BR
Answers:
\\{$ml->print_a\\}
END_TEXT
ANS( $ml->ra_correct_ans() );
Matching list object creation macro
Usage:
$ml = new_match_list();
Which is short hand for the following direct call to Match
$ml = new Match(random(1,2000,1), ~~&std_print_q, ~~&std_print_a);
Either call will create a matching list object in the variable $ml.
( Note: $ml cannot be a my variable if it is to be used within a BEGIN_TEXT/END_TEXT
block.)
The first argument is the seed for the match list (choosen at random between 1 and
2000 in
the example above.). The next two arguments are references to the print subroutines
used to print the questions and the answers.
Other printing methods can be used instead of the standard ones. An
example of how to do this is demonstrated with
"pop_up_list_print_q" below.
Standard method for formatting a list of questions with answer blanks.
This formatting routine is the default method for formatting the
way questions are printed
for each of the three sub-classes of "List.pm". It lists the questions vertically,
numbering
them sequentially and providing an answer blank before each question.
std_print_q checks which mode the user is trying to print the
questions from and returns the appropriately formatted string.
The length of the answer blank can be set with $ml-
To replace the standard question formatting method with your own, use:
$ml->rf_print_q(~~&my_question_format_method)
Your method should be a subroutine of the form my_question_format_method($self, @questions)
and should return a string to be printed. The @questions array contains the
questions to be listed, while $self can be used to obtain extra information from
the object for formatting purposes. The variable $main::displayMode contains the
current display mode. (See "MODES" for more details on display modes and
see "writing print methods for lists" for details on constructing formatting subroutines.)
Standard method for formatting a list of answers.
This simple formatting routine is the default method for formatting
the answers for matching lists. It lists the answers vertically
lettered sequentially.
To replace the standard answer formatting method with your own subroutine use:
$ml->rf_print_q(~~&my_answer_format_method)
The answer formatting method has the same interface as the question formatting
method.
Select list object creation macro
Usage:
$sl = new_select_list;
Which is equivalent to this direct call to Select
$sl = new Select(random(1,2000,1), ~~&std_print_q, ~~&std_print_a);
Either call will create a select list object in the variable $sl. ( Note that
$sl cannot be a my variable if it is to be used within a BEGIN_TEXT/END_TEXT
block.) The printing methods are the same as those defined for new_match_list
above.
See the documentation for "Select.pm" to see how to use this
object to create a true/false question.
std_print_a is only intended to be used for debugging with select lists, as there
is rarely a reason to
print out the answers to a select list.
Usage:
$sl = new_pop_up_select_list;</I></PRE>
Which is equivalent to this direct call to Select
$sl = new Select(random(1,2000,1), ~~&pop_up_list_print_q, ~~&std_print_a);
Either call will create a select list object in the variable $sl. ( Note that
$sl cannot be a my variable if it is to be used within a BEGIN_TEXT/END_TEXT
block.) The printing methods are passed as references (~~ in PG equals \ in
perl) to subroutines so that no matter what printing subroutines are used,
those subroutines can be used by saying $sl->print_q and $sl->print_a. This
also means that other subroutines can be used instead of the default ones.
| See the documentation for <a href='Select'>Select.pm</a> to see how to use this
|
| object to create a true/false question. |
Standard method for printing questions with answer boxes
See std_print_q under Matching Lists above.
Alternate method for print questions with pop up lists.
Usage:
This printing routine is used to print the questions for a true/false or other
select list with a preceding pop up list of possible answers. A list of values
and labels need to be given to the pop_up_list so that the intended answer is
returned when a student selects an answer form the list. Notethe use of => to
associate the values on the left with the labels on the right, this means that,
for instance, the student will see the word True in the pop_up_list but the
answer that is returned to the grader is T, so that it corresponds with what
the professor typed in as the answer when using $sl->qa('blah blah', 'T');
$sl->ra_pop_up_list([value => label,
T => 'True',
F => 'False']);
This is only intended to be used for debugging as there is rarely a reason to
print out the answers to a select list.
See std_print_a under Matching Lists above.
Multiple choice object creation macro
Usage:
$mc = new_multiple_choice; Which is equivalent to this direct call to Multiple
$mc = new Multiple(random(1,2000,1), ~~&std_print_q, ~~&std_print_a); Either call will create a multiple choice
object in the variable $mc. Note that
$mc cannot be a my variable if it is to be used within a BEGIN_TEXT/END_TEXT
block.
See the documentation for Multiple.pm to see how to use
this object to create a multiple choice question.
Standard method for printing questions
See std_print_q under Matching Lists above.
Method for printing answers with radio buttons
This simple printing routine is used to print the answers to multiple choice
questions in a bulleted style with radio buttons preceding each possible answer.
When a multiple choice object is created, a reference to radio_print_a is passed
to that object so that it can be used from within the object later.
radio_print_a checks which mode the user is trying to print the answers from and
returns the appropriately formatted string.
Checkbox multiple choice object creation macro
Usage:
$cmc = new_checkbox_multiple_choice; Which is equivalent to this direct call to
Multiple
$cmc = new Multiple(random(1,2000,1), ~~&std_print_q, ~~&checkbox_print_a); Either call will create a checkbox multiple
choice object in the variable $cmc. Note that
$cmc cannot be a my variable if it is to be used within a BEGIN_TEXT/END_TEXT
block.
See the documentation for Multiple.pm to see how to use
this object to create a multiple choice question.
Standard method for printing questions
See std_print_q under Matching Lists above.
Method for printing answers with radio buttons
This simple printing routine is used to print the answers to multiple choice
questions in a bulleted style with checkboxes preceding each possible answer.
When a multiple choice object is created, a reference to checkbox_print_a is passed
to that object so that it can be used from within the object later.
checkbox_print_a checks which mode the user is trying to print the answers from and
returns the appropriately formatted string.
Usage: $ml = new_match_list();
Note that $ml cannot be a my variable if used within a BEGIN_TEXT/END_TEXT block
Note that $sl cannot be a my variable if used within a BEGIN_TEXT/END_TEXT block
Usage: $pusl = new_pop_up_select_list();
Usage: $mc = new_multiple_choice();
Usage: $mcc = new_checkbox_multiple_choice();
Usage: $sl->rf_print_a(~~&pop_up_list_print_q);
$sl->ra_pop_up_list([</I>value<I> => </I>label<I>, T => 'True', F =>
'False']);
These are maintained for backward compatibility.
They can still be useful in constructing non-standard lists that don't fit
the various list objects. In general the using the list objects is likely
to give better results and is preferred.
File path = /ww/webwork/pg/macros/PGchoicemacros.pl
<| Post or View Comments |>
|