View of /trunk/webwork-modperl/conf/global.conf.dist

    1 #!perl
    2 ################################################################################
    3 # WeBWorK Online Homework Delivery System
    4 # Copyright © 2000-2003 The WeBWorK Project, http://openwebwork.sf.net/
    5 # $CVSHeader: webwork2/conf/global.conf.dist,v 1.97 2004/08/23 19:14:42 jj Exp $
    6 #
    7 # This program is free software; you can redistribute it and/or modify it under
    8 # the terms of either: (a) the GNU General Public License as published by the
    9 # Free Software Foundation; either version 2, or (at your option) any later
   10 # version, or (b) the "Artistic License" which comes with this package.
   11 #
   12 # This program is distributed in the hope that it will be useful, but WITHOUT
   13 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   14 # FOR A PARTICULAR PURPOSE.  See either the GNU General Public License or the
   15 # Artistic License for more details.
   16 ################################################################################
   17 
   18 # This file is used to set up the default WeBWorK course environment for all
   19 # requests. Values may be overwritten by the course.conf for a specific course.
   20 # All package variables set in this file are added to the course environment.
   21 # If you wish to set a variable here but omit it from the course environment,
   22 # use the "my" keyword. The $webwork_dir variable is set in the WeBWorK Apache
   23 # configuration file (webwork.apache-config) and is available for use here. In
   24 # addition, the $courseName variable holds the name of the current course.
   25 
   26 ################################################################################
   27 # Seed variables
   28 ################################################################################
   29 
   30 # Set these variables to correspond to your configuration and preferences. You
   31 # will need to restart the webserver to reset the variables in this section
   32 
   33 # URL of WeBWorK handler.
   34 $webwork_url         = "/webwork2";
   35 
   36 # Root directory of PG.
   37 $pg_dir              = "/opt/pg";
   38 
   39 # URL and path to htdocs directory.
   40 $webwork_htdocs_url  = "/webwork2_files";
   41 $webwork_htdocs_dir  = "$webwork_dir/htdocs";
   42 
   43 # URL and path to courses directory.
   44 $webwork_courses_url = "/webwork2_course_files";
   45 $webwork_courses_dir = "$webwork_dir/courses";
   46 
   47 ################################################################################
   48 # Paths to external programs
   49 ################################################################################
   50 
   51 $externalPrograms{mkdir}    = "/bin/mkdir";
   52 $externalPrograms{mysql}    = "/usr/local/bin/mysql";
   53 
   54 $externalPrograms{latex}    = "/usr/local/bin/latex";
   55 $externalPrograms{pdflatex} = "/usr/local/bin/pdflatex";
   56 $externalPrograms{dvipng}   = "/usr/local/bin/dvipng";
   57 $externalPrograms{tth}      = "/usr/local/bin/tth";
   58 
   59 ################################################################################
   60 # Mail settings
   61 ################################################################################
   62 
   63 # Mail sent by the PG system and the mail merge and feedback modules will be
   64 # sent via this SMTP server.
   65 $mail{smtpServer}            = 'mail.yourschool.edu';
   66 
   67 # When connecting to the above server, WeBWorK will send this address in the
   68 # MAIL FROM command. This has nothing to do with the "From" address on the mail
   69 # message. It can really be anything, but some mail servers require it contain
   70 # a valid mail domain, or at least be well-formed.
   71 $mail{smtpSender}            = 'webwork@yourserver.yourschool.edu';
   72 
   73 # AllowedRecipients defines addresses that the PG system is allowed to send mail
   74 # to. this prevents subtle PG exploits. This should be set in course.conf to the
   75 # addresses of professors of each course. Sending mail from the PG system (i.e.
   76 # questionaires, essay questions) will fail if this is not set somewhere (either
   77 # here or in course.conf).
   78 $mail{allowedRecipients}     = [
   79   #'prof1@yourserver.yourdomain.edu',
   80   #'prof2@yourserver.yourdomain.edu',
   81 ];
   82 
   83 # If defined, feedbackRecipients overrides the list of recipients for feedback
   84 # email. It's appropriate to set this in the course.conf for specific courses,
   85 # but probably not in global.conf. if not defined, mail is sent to all
   86 # professors and TAs for a given course
   87 #$mail{feedbackRecipients}    = [
   88 # 'prof1@yourserver.yourdomain.edu',
   89 # 'prof2@yourserver.yourdomain.edu',
   90 #];
   91 
   92 # feedbackVerbosity:
   93 #  0: send only the feedback comment and context link
   94 #  1: as in 0, plus user, set, problem, and PG data
   95 #  2: as in 1, plus the problem environment (debugging data)
   96 $mail{feedbackVerbosity}     = 1;
   97 
   98 # Defines the size of the Mail Merge editor window
   99 # FIXME: should this be here? it's UI, not mail
  100 # FIXME: replace this with the auto-size method that TWiki uses
  101 $mail{editor_window_rows}    = 15;
  102 $mail{editor_window_columns} = 100;
  103 
  104 ################################################################################
  105 # System-wide locations (directories and URLs)
  106 ################################################################################
  107 
  108 # The root directory, set by webwork_root variable in Apache configuration.
  109 $webworkDirs{root}          = "$webwork_dir";
  110 
  111 # Location of system-wide data files.
  112 $webworkDirs{DATA}          = "$webworkDirs{root}/DATA";
  113 
  114 # Used for temporary storage of uploaded files.
  115 $webworkDirs{uploadCache}   = "$webworkDirs{DATA}/uploads";
  116 
  117 # Location of utility programs.
  118 $webworkDirs{bin}           = "$webworkDirs{root}/bin";
  119 
  120 # Location of configuration files, templates, snippets, etc.
  121 $webworkDirs{conf}          = "$webworkDirs{root}/conf";
  122 
  123 # Location of course directories.
  124 $webworkDirs{courses}       = "$webwork_courses_dir" || "$webworkDirs{root}/courses";
  125 
  126 # Contains log files.
  127 $webworkDirs{logs}          = "$webworkDirs{root}/logs";
  128 
  129 # Contains non-web-accessible temporary files, such as TeX working directories.
  130 $webworkDirs{tmp}           = "$webworkDirs{root}/tmp";
  131 
  132 ##### The following locations are web-accessible.
  133 
  134 # The root URL (usually /webwork2), set by <Location> in Apache configuration.
  135 $webworkURLs{root}          = "$webwork_url";
  136 
  137 # Location of system-wide web-accessible files, such as equation images, and
  138 # help files.
  139 $webworkDirs{htdocs}        = "$webwork_htdocs_dir" || "$webworkDirs{root}/htdocs";
  140 $webworkURLs{htdocs}        = "$webwork_htdocs_url";
  141 
  142 # Location of web-accessible temporary files, such as equation images.
  143 $webworkDirs{htdocs_temp}   = "$webworkDirs{htdocs}/tmp";
  144 $webworkURLs{htdocs_temp}   = "$webworkURLs{htdocs}/tmp";
  145 
  146 # Location of cached equation images.
  147 $webworkDirs{equationCache} = "$webworkDirs{htdocs_temp}/equations";
  148 $webworkURLs{equationCache} = "$webworkURLs{htdocs_temp}/equations";
  149 
  150 # Contains context-sensitive help files.
  151 $webworkDirs{local_help}    = "$webworkDirs{htdocs}/helpFiles";
  152 $webworkURLs{local_help}    = "$webworkURLs{htdocs}/helpFiles";
  153 
  154 # URL of general WeBWorK documentation.
  155 $webworkURLs{docs}          = "http://webhost.math.rochester.edu/webworkdocs/docs";
  156 
  157 # URL of WeBWorK 1.x profLogin.pl script, for access to old professor pages.
  158 # Note that both systems must share a single "courses" directory for this to be
  159 # useful. Leave this blank to disable
  160 $webworkURLs{oldProf}       = "/webwork1/profLogin.pl";
  161 
  162 # URL of WeBWorK Bugzilla database.
  163 $webworkURLs{bugReporter}   = "http://bugs.webwork.rochester.edu/enter_bug.cgi?product=WeBWorK%20mod_perl";
  164 
  165 # Location of jsMath script, used for the jsMath display mode.
  166 $webworkURLs{jsMath}        = "$webworkURLs{htdocs}/jsMath/jsMath.js";
  167 
  168 # Location of ASCIIMathML script, used for the asciimath display mode.
  169 $webworkURLs{asciimath}     = "$webworkURLs{htdocs}/ASCIIMathML/ASCIIMathML.js";
  170 
  171 ################################################################################
  172 # Defaults for course-specific locations (directories and URLs)
  173 ################################################################################
  174 
  175 # The root directory of the current course. (The ID of the current course is
  176 # available in $courseName.)
  177 $courseDirs{root}        = "$webworkDirs{courses}/$courseName";
  178 
  179 # Location of course-specific data files, such as WW1 (GDBM) database files.
  180 $courseDirs{DATA}        = "$courseDirs{root}/DATA";
  181 
  182 # Location of authentication data files when using a WW1 (GDBM) database.
  183 $courseDirs{auth_DATA}   = "$courseDirs{DATA}/.auth";
  184 
  185 # Location of course HTML files, passed to PG.
  186 $courseDirs{html}        = "$courseDirs{root}/html";
  187 $courseURLs{html}        = "$webwork_courses_url/$courseName";
  188 
  189 # Location of course image files, passed to PG.
  190 $courseDirs{html_images} = "$courseDirs{html}/images";
  191 
  192 # Location of web-accessible, course-specific temporary files, like static and
  193 # dynamically-generated PG graphics.
  194 $courseDirs{html_temp}   = "$courseDirs{html}/tmp";
  195 $courseURLs{html_temp}   = "$courseURLs{html}/tmp";
  196 
  197 # Location of course-specific logs, like the transaction log.
  198 $courseDirs{logs}        = "$courseDirs{root}/logs";
  199 
  200 # Location of scoring files.
  201 $courseDirs{scoring}     = "$courseDirs{root}/scoring";
  202 
  203 # Location of PG templates and set definition files.
  204 $courseDirs{templates}   = "$courseDirs{root}/templates";
  205 
  206 # Location of course-specific macro files.
  207 $courseDirs{macros}      = "$courseDirs{templates}/macros";
  208 
  209 # Location of mail-merge templates.
  210 $courseDirs{email}       = "$courseDirs{templates}/email";
  211 
  212 ################################################################################
  213 # System-wide files
  214 ################################################################################
  215 
  216 # Location of this file.
  217 $webworkFiles{environment}                      = "$webworkDirs{conf}/global.conf";
  218 
  219 # Flat-file database used to protect against MD5 hash collisions. TeX equations
  220 # are hashed to determine the name of the image file. There is a tiny chance of
  221 # a collision between two TeX strings. This file allows for that. However, this
  222 # is slow, so most people chose not to worry about it. Set this to "" if you
  223 # don't want to use the equation cache file.
  224 $webworkFiles{equationCacheDB}                  = ""; # "$webworkDirs{DATA}/equationcache";
  225 
  226 ##### Hardcopy snippets are used in constructing a TeX file for hardcopy output.
  227 ##### They should contain TeX code unless otherwise noted.
  228 
  229 # The preamble is the first thing in the TeX file.
  230 $webworkFiles{hardcopySnippets}{preamble}       = "$webworkDirs{conf}/snippets/hardcopyPreamble.tex";
  231 
  232 # The setHeader preceeds each set. It is a PG file.
  233 $webworkFiles{hardcopySnippets}{setHeader}      = "$webworkDirs{conf}/snippets/setHeader.pg";  # hardcopySetHeader.pg",
  234 
  235 # The problem divider goes between problems.
  236 $webworkFiles{hardcopySnippets}{problemDivider} = "$webworkDirs{conf}/snippets/hardcopyProblemDivider.tex";
  237 
  238 # The set footer goes after each set. Is is a PG file.
  239 $webworkFiles{hardcopySnippets}{setFooter}      = "$webworkDirs{conf}/snippets/hardcopySetFooter.pg";
  240 
  241 # The set divider goes between sets (in multiset output).
  242 $webworkFiles{hardcopySnippets}{setDivider}     = "$webworkDirs{conf}/snippets/hardcopySetDivider.tex";
  243 
  244 # The user divider does between users (in multiuser output).
  245 $webworkFiles{hardcopySnippets}{userDivider}    = "$webworkDirs{conf}/snippets/hardcopyUserDivider.tex";
  246 
  247 # The postabmle is the last thing in the TeX file.
  248 $webworkFiles{hardcopySnippets}{postamble}      = "$webworkDirs{conf}/snippets/hardcopyPostamble.tex";
  249 
  250 ##### Screen snippets are used when displaying problem sets on the screen.
  251 
  252 # The set header is displayed on the problem set page. It is a PG file.
  253 $webworkFiles{screenSnippets}{setHeader}        = "$webworkDirs{conf}/snippets/setHeader.pg"; # screenSetHeader.pg"
  254 
  255 ################################################################################
  256 # Course-specific files
  257 ################################################################################
  258 
  259 # The course configuration file.
  260 $courseFiles{environment} = "$courseDirs{root}/course.conf";
  261 
  262 # File contents are displayed after login, on the problem sets page. Path given
  263 # here is relative to the templates directory.
  264 $courseFiles{course_info} = "course_info.txt";
  265 
  266 # File contents are displayed on the login page. Path given here is relative to
  267 # the templates directory.
  268 $courseFiles{login_info}  = "login_info.txt";
  269 
  270 # Additional library buttons can be added to the Library Browser (SetMaker.pm)
  271 # by adding the libraries you want to the following line.  For each key=>value
  272 # in the list, if a directory (or link to a directory) with name 'key' appears
  273 # in the templates directory, then a button with name 'value' will be placed at
  274 # the top of the problem browser.  (No button will appear if there is no
  275 # directory or link with the given name in the templates directory.)  For
  276 # example,
  277 #
  278 #     $courseFiles{problibs} = {rochester => "Rochester", asu => "ASU"};
  279 #
  280 # would add two buttons, one for the Rochester library and one for the ASU
  281 # library, provided templates/rochester and templates/asu exists.
  282 #
  283 $courseFiles{problibs}    = {};
  284 
  285 ################################################################################
  286 # Database options
  287 ################################################################################
  288 
  289 # Several database are defined in the file conf/database.conf and stored in the
  290 # hash %dbLayouts.
  291 include "conf/database.conf";
  292 
  293 # Select the default database layout. This can be overridden in the course.conf
  294 # file of a particular course. If you choose "gdbm", WeBWorK will be able to
  295 # use courses from WeBWorK 1 without first adding course.conf files to them.
  296 # However, the recommended database layout for new courses is "sql_single". This
  297 # can be set when creating a course.
  298 $dbLayoutName = "sql_single"; # or "gdbm" or "sql"
  299 
  300 # This sets the symbol "dbLayout" as an alias for the selected database layout.
  301 *dbLayout     = $dbLayouts{$dbLayoutName};
  302 
  303 ################################################################################
  304 # Problem library options
  305 ################################################################################
  306 
  307 # The directory containing the problem library files. Set to "" if no problem
  308 # library is installed.
  309 $problemLibrary{root}        = "";
  310 
  311 # The name of the SQL database containing problem metadata
  312 $problemLibrary{sourceSQL}   = "ProblemLibrary";
  313 
  314 # The user name to use when connecting to the problem library database
  315 $problemLibrary{userSQL}     = "webworkRead";
  316 
  317 # The password to use when connecting to the problem library database
  318 $problemLibrary{passwordSQL} = "";
  319 
  320 ################################################################################
  321 # Logs
  322 ################################################################################
  323 
  324 # FIXME: take logs out of %webworkFiles/%courseFiles and give them their own
  325 # top-level hash.
  326 
  327 # Logs data about how long it takes to process problems. (Do not confuse this
  328 # with the /other/ timing log which can be set by WeBWorK::Timing and is used
  329 # for benchmarking system performance in general. At some point, this timing
  330 # mechanism will be deprecated in favor of the WeBWorK::Timing mechanism.)
  331 $webworkFiles{logs}{timing}         = "$webworkDirs{logs}/timing.log";
  332 
  333 # The transaction log contains data from each recorded answer submission. This
  334 # is useful if the database becomes corrupted.
  335 $webworkFiles{logs}{transaction}    = "$courseDirs{logs}/transaction.log";
  336 
  337 # The answer log stores a history of all users' submitted answers.
  338 $courseFiles{logs}{answer_log}      = "$courseDirs{logs}/answer_log";
  339 
  340 ################################################################################
  341 # More paths to external programs
  342 ################################################################################
  343 
  344 # These image conversion utilities are included in the WeBWorK distribution.
  345 $externalPrograms{gif2eps}  = "$webworkDirs{bin}/gif2eps";
  346 $externalPrograms{png2eps}  = "$webworkDirs{bin}/png2eps";
  347 $externalPrograms{gif2png}  = "$webworkDirs{bin}/gif2png";
  348 
  349 ################################################################################
  350 # Site defaults (FIXME: what other things could be "site defaults"?)
  351 ################################################################################
  352 
  353 # Status strings -- lists valid status values and their names. If your site uses
  354 # additional values, add them here.
  355 $siteDefaults{status} = {
  356   A        => "Audit",
  357   audit    => "Audit",
  358   D        => "Drop",
  359   drop     => "Drop",
  360   withdraw => "Drop",
  361   C        => "Enrolled",
  362   current  => "Enrolled",
  363   enrolled => "Enrolled",
  364 };
  365 
  366 ################################################################################
  367 # Frontend options
  368 ################################################################################
  369 
  370 %templates = (
  371   system => "$webworkDirs{conf}/templates/ur.template",
  372 );
  373 
  374 ################################################################################
  375 # Authorization system
  376 ################################################################################
  377 
  378 # This lets you specify a minimum permission level needed to perform certain
  379 # actions.  In the current system, >=10 will allow a professor to perform the
  380 # action, >=5 will allow a TA to, and >=0 will allow a student to perform an
  381 # action (almost never what you want).
  382 
  383 my $student   = 0;
  384 my $ta        = 5;
  385 my $professor = 10;
  386 my $nobody    = undef;
  387 
  388 %permissionLevels = (
  389   report_bugs                    => $student,
  390 
  391   view_multiple_sets             => $ta,
  392   view_unopened_sets             => $ta,
  393   view_unpublished_sets          => $ta,
  394   view_answers                   => $ta,
  395 
  396   become_student                 => $professor,
  397   access_instructor_tools        => $ta,
  398   score_sets                     => $professor,
  399   send_mail                      => $professor,
  400 
  401   create_and_delete_problem_sets => $professor,
  402   assign_problem_sets            => $professor,
  403   modify_problem_sets            => $professor,
  404   modify_student_data            => $professor,
  405 
  406   modify_classlist_files         => $professor,
  407   modify_set_def_files           => $professor,
  408   modify_scoring_files           => $professor,
  409   modify_problem_template_files  => $professor,
  410 
  411   create_and_delete_courses      => $professor,
  412   fix_course_databases           => $professor,
  413 
  414   ##### Behavior of the interactive problem processor #####
  415 
  416   show_correct_answers_before_answer_date         => $ta,
  417   show_solutions_before_answer_date               => $ta,
  418   avoid_recording_answers                         => $ta,
  419 
  420   check_answers_before_open_date                  => $ta,
  421   check_answers_after_open_date_with_attempts     => $ta,
  422   check_answers_after_open_date_without_attempts  => $student,
  423   check_answers_after_due_date                    => $student,
  424   check_answers_after_answer_date                 => $student,
  425 
  426   record_answers_when_acting_as_student           => $nobody,
  427 
  428   # "record_answers_when_acting_as_student" takes precedence
  429   # over the following for professors acting as students:
  430   record_answers_before_open_date                 => $nobody,
  431   record_answers_after_open_date_with_attempts    => $student,
  432   record_answers_after_open_date_without_attempts => $nobody,
  433   record_answers_after_due_date                   => $nobody,
  434   record_answers_after_answer_date                => $nobody,
  435 );
  436 
  437 ################################################################################
  438 # Session options
  439 ################################################################################
  440 
  441 # $sessionKeyTimeout defines seconds of inactivity before a key expires
  442 $sessionKeyTimeout = 60*30;
  443 
  444 # $sessionKeyLength defines the length (in characters) of the session key
  445 $sessionKeyLength = 40;
  446 
  447 # @sessionKeyChars lists the legal session key characters
  448 @sessionKeyChars = ('A'..'Z', 'a'..'z', '0'..'9', '.', '^', '/', '!', '*');
  449 
  450 # Practice users are users who's names start with $practiceUser
  451 # (you can comment this out to remove practice user support)
  452 $practiceUserPrefix = "practice";
  453 
  454 # There is a practice user who can be logged in multiple times.  He's
  455 # commented out by default, though, so you don't hurt yourself.  It is
  456 # kindof a backdoor to the practice user system, since he doesn't have a
  457 # password.  Come to think of it, why do we even have this?!
  458 #$debugPracticeUser = "practice666";
  459 
  460 ################################################################################
  461 # PG subsystem options
  462 ################################################################################
  463 
  464 # List of enabled display modes. Comment out any modes you don't wish to make
  465 # available for use.
  466 $pg{displayModes} = [
  467   "plainText",     # display raw TeX for math expressions
  468   "formattedText", # format math expressions using TtH
  469   "images",        # display math expressions as images generated by dvipng
  470   "jsMath",        # render TeX math expressions on the client side using jsMath
  471   "asciimath",     # render TeX math expressions on the client side using ASCIIMathML
  472 ];
  473 
  474 #### Default settings for the PG translator
  475 
  476 # Default display mode. Should be listed above.
  477 $pg{options}{displayMode}        = "images";
  478 
  479 # The default grader to use, if a problem doesn't specify.
  480 $pg{options}{grader}             = "avg_problem_grader";
  481 
  482 # Fill in answer blanks with the student's last answer by default?
  483 $pg{options}{showOldAnswers}     = 1;
  484 
  485 # Show correct answers (when allowed) by default?
  486 $pg{options}{showCorrectAnswers} = 0;
  487 
  488 # Show hints (when allowed) by default?
  489 $pg{options}{showHints}          = 0;
  490 
  491 # Show solutions (when allowed) by default?
  492 $pg{options}{showSolutions}      = 0;
  493 
  494 # Catch translation warnings internally by default? (We no longer need to do
  495 # this, since there is a global warnings handler. So this should be off.)
  496 $pg{options}{catchWarnings}      = 0;
  497 
  498 ##### Currently-selected renderer
  499 
  500 # Only the local renderer is supported in this version.
  501 $pg{renderer} = "WeBWorK::PG::Local";
  502 
  503 # The remote renderer connects to an XML-RPC PG rendering server.
  504 #$pg{renderer} = "WeBWorK::PG::Remote"'
  505 
  506 ##### Renderer-dependent options
  507 
  508 # The remote renderer has one option:
  509 $pg{renderers}{"WeBWorK::PG::Remote"} = {
  510   # The "proxy" server to connect to for remote rendering.
  511   proxy => "http://localhost:21000/RenderD",
  512 };
  513 
  514 ##### Settings for various display modes
  515 
  516 # "images" mode has several settings:
  517 $pg{displayModeOptions}{images} = {
  518   # Determines the method used to align images in output. Can be
  519   # "baseline", "absmiddle", or "mysql".
  520   dvipng_align => 'baseline',
  521 
  522   # If we choose mysql, we need information on connecting to the
  523   # database. Whatever you use here, you have to create the database
  524   # and grant read/write priveleges to the user listed here. To create
  525   # the database in mysql, as root use:
  526   #
  527   #     CREATE DATABASE DvipngDepths;
  528   #     USE DvipngDepths;
  529   #     CREATE TABLE depths (md5 CHAR(33) NOT NULL, depth SMALLINT, PRIMARY KEY (md5));
  530   #     GRANT ALL ON DvipngDepths.* TO webworkWrite;
  531   #
  532   # In the last statement, "webworkWrite" should match the user below.
  533   dvipng_depth_db => {
  534     dbsource => 'dbi:mysql:DvipngDepths',
  535     user     => $dbLayouts{sql}->{password}->{params}->{usernameRW},
  536     passwd   => $dbLayouts{sql}->{password}->{params}->{passwordRW},
  537   },
  538 };
  539 
  540 ##### Directories used by PG
  541 
  542 # The root of the PG directory tree (from pg_root in Apache config).
  543 $pg{directories}{root}   = "$pg_dir";
  544 $pg{directories}{lib}    = "$pg{directories}{root}/lib";
  545 $pg{directories}{macros} = "$pg{directories}{root}/macros";
  546 
  547 ##### "Special" PG environment variables. (Stuff that doesn't fit in anywhere else.)
  548 
  549 # Users for whom to print the file name of the PG file being processed.
  550 $pg{specialPGEnvironmentVars}{PRINT_FILE_NAMES_FOR} = [ "professor", ];
  551 
  552 # Locations of CAPA resources. (Only necessary if you need to use converted CAPA
  553 # problems.)
  554 $pg{specialPGEnvironmentVars}{CAPA_Tools}             = "$courseDirs{macros}/CAPA_Tools/",
  555 $pg{specialPGEnvironmentVars}{CAPA_MCTools}           = "$courseDirs{macros}/CAPA_MCTools/",
  556 $pg{specialPGEnvironmentVars}{CAPA_GraphicsDirectory} = "$courseDirs{html}/CAPA_Graphics/",
  557 $pg{specialPGEnvironmentVars}{CAPA_Graphics_URL}      = "$courseURLs{html}/CAPA_Graphics/",
  558 
  559 # Size in pixels of dynamically-generated images, i.e. graphs.
  560 $pg{specialPGEnvironmentVars}{onTheFlyImageSize}      = 400,
  561 
  562 ##### PG modules to load
  563 
  564 # The first item of each list is the module to load. The remaining items are
  565 # additional packages to import.
  566 
  567 ${pg}{modules} = [
  568   [qw(DynaLoader)],
  569   [qw(Exporter)],
  570   [qw(GD)],
  571 
  572   [qw(AlgParser AlgParserWithImplicitExpand Expr ExprWithImplicitExpand)],
  573   [qw(AnswerHash AnswerEvaluator)],
  574   [qw(WWPlot)], # required by Circle (and others)
  575   [qw(Circle)],
  576   [qw(Complex)],
  577   [qw(Complex1)],
  578   [qw(Distributions)],
  579   [qw(Fraction)],
  580   [qw(Fun)],
  581   [qw(Hermite)],
  582   [qw(Label)],
  583   [qw(List)],
  584   [qw(Match)],
  585   [qw(MatrixReal1)], # required by Matrix
  586   [qw(Matrix)],
  587   [qw(Multiple)],
  588   [qw(PGrandom)],
  589   [qw(Regression)],
  590   [qw(Select)],
  591   [qw(Units)],
  592   [qw(VectorField)],
  593   [qw(Parser Value)],
  594 ];
  595 
  596 ##### Answer evaluatior defaults
  597 
  598 $pg{ansEvalDefaults} = {
  599   functAbsTolDefault            => .001,
  600   functLLimitDefault            => .0000001,
  601   functMaxConstantOfIntegration => 1E8,
  602   functNumOfPoints              => 3,
  603   functRelPercentTolDefault     => .1,
  604   functULimitDefault            => .9999999,
  605   functVarDefault               => "x",
  606   functZeroLevelDefault         => 1E-14,
  607   functZeroLevelTolDefault      => 1E-12,
  608   numAbsTolDefault              => .001,
  609   numFormatDefault              => "",
  610   numRelPercentTolDefault       => .1,
  611   numZeroLevelDefault           => 1E-14,
  612   numZeroLevelTolDefault        => 1E-12,
  613   useBaseTenLog                 => 0,
  614   defaultDisplayMatrixStyle     => "[s]",
  615 };
  616 
  617 ################################################################################
  618 # Compatibility
  619 ################################################################################
  620 
  621 # Define the old names for the various "root" variables.
  622 $webworkRoot    = $webworkDirs{root};
  623 $webworkURLRoot = $webworkURLs{root};
  624 $pgRoot         = $pg{directories}{root};