--- loncom/interface/loncommon.pm 2003/08/20 18:18:45 1.112
+++ loncom/interface/loncommon.pm 2003/11/04 19:01:01 1.142
@@ -1,7 +1,7 @@
# The LearningOnline Network with CAPA
# a pile of common routines
#
-# $Id: loncommon.pm,v 1.112 2003/08/20 18:18:45 bowersj2 Exp $
+# $Id: loncommon.pm,v 1.142 2003/11/04 19:01:01 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -68,6 +68,9 @@ use POSIX qw(strftime mktime);
use Apache::Constants qw(:common :http :methods);
use Apache::lonmsg();
use Apache::lonmenu();
+use Apache::lonlocal;
+use HTML::Entities;
+
my $readit;
=pod
@@ -78,6 +81,7 @@ my $readit;
# ----------------------------------------------- Filetypes/Languages/Copyright
my %language;
+my %supported_language;
my %cprtag;
my %fe; my %fd;
my %category_extensions;
@@ -144,8 +148,11 @@ BEGIN {
while (<$fh>) {
next if /^\#/;
chomp;
- my ($key,$two,$country,$three,$enc,$val)=(split(/\t/,$_));
+ my ($key,$two,$country,$three,$enc,$val,$sup)=(split(/\t/,$_));
$language{$key}=$val.' - '.$enc;
+ if ($sup) {
+ $supported_language{$key}=$sup;
+ }
}
}
}
@@ -268,7 +275,7 @@ of the element the selection from the se
sub browser_and_searcher_javascript {
return <<END;
var editbrowser = null;
- function openbrowser(formname,elementname,only,omit) {
+ function openbrowser(formname,elementname,only,omit,titleelement) {
var url = '/res/?';
if (editbrowser == null) {
url += 'launch=1&';
@@ -282,6 +289,9 @@ sub browser_and_searcher_javascript {
if (omit != null) {
url += 'omit=' + omit + '&';
}
+ if (titleelement != null) {
+ url += 'titleelement=' + titleelement + '&';
+ }
url += 'element=' + elementname + '';
var title = 'Browser';
var options = 'scrollbars=1,resizable=1,menubar=0';
@@ -290,7 +300,7 @@ sub browser_and_searcher_javascript {
editbrowser.focus();
}
var editsearcher;
- function opensearcher(formname,elementname) {
+ function opensearcher(formname,elementname,titleelement) {
var url = '/adm/searchcat?';
if (editsearcher == null) {
url += 'launch=1&';
@@ -298,6 +308,9 @@ sub browser_and_searcher_javascript {
url += 'catalogmode=interactive&';
url += 'mode=edit&';
url += 'form=' + formname + '&';
+ if (titleelement != null) {
+ url += 'titleelement=' + titleelement + '&';
+ }
url += 'element=' + elementname + '';
var title = 'Search';
var options = 'scrollbars=1,resizable=1,menubar=0';
@@ -346,17 +359,18 @@ sub selectstudent_link {
return '';
}
return "<a href='".'javascript:openstdbrowser("'.$form.'","'.$unameele.
- '","'.$udomele.'");'."'>Select User</a>";
+ '","'.$udomele.'");'."'>".&mt('Select User')."</a>";
}
if ($ENV{'request.role'}=~/^(au|dc|su)/) {
return "<a href='".'javascript:openstdbrowser("'.$form.'","'.$unameele.
- '","'.$udomele.'",1);'."'>Select User</a>";
+ '","'.$udomele.'",1);'."'>".&mt('Select User')."</a>";
}
return '';
}
sub coursebrowser_javascript {
- return (<<'ENDSTDBRW');
+ my ($domainfilter)=@_;
+ return (<<ENDSTDBRW);
<script type="text/javascript" language="Javascript" >
var stdeditbrowser;
function opencrsbrowser(formname,uname,udom) {
@@ -367,6 +381,12 @@ sub coursebrowser_javascript {
url += 'filter='+filter+'&';
}
}
+ var domainfilter='$domainfilter';
+ if (domainfilter != null) {
+ if (domainfilter != '') {
+ url += 'domainfilter='+domainfilter+'&';
+ }
+ }
url += 'form=' + formname + '&cnumelement='+uname+
'&cdomelement='+udom;
var title = 'Course_Browser';
@@ -382,7 +402,7 @@ ENDSTDBRW
sub selectcourse_link {
my ($form,$unameele,$udomele)=@_;
return "<a href='".'javascript:opencrsbrowser("'.$form.'","'.$unameele.
- '","'.$udomele.'");'."'>Select Course</a>";
+ '","'.$udomele.'");'."'>".&mt('Select Course')."</a>";
}
=pod
@@ -514,7 +534,7 @@ END
foreach my $value (sort(keys(%$hashref))) {
$result.=" <option value=\"$value\" ";
$result.=" selected=\"true\" " if ($value eq $firstdefault);
- $result.=">$hashref->{$value}->{'text'}</option>\n";
+ $result.=">".&mt($hashref->{$value}->{'text'})."</option>\n";
}
$result .= "</select>\n";
my %select2 = %{$hashref->{$firstdefault}->{'select2'}};
@@ -524,7 +544,7 @@ END
foreach my $value (sort(keys(%select2))) {
$result.=" <option value=\"$value\" ";
$result.=" selected=\"true\" " if ($value eq $seconddefault);
- $result.=">$select2{$value}</option>\n";
+ $result.=">".&mt($select2{$value})."</option>\n";
}
$result .= "</select>\n";
# return $debug;
@@ -624,8 +644,6 @@ sub helpLatexCheatsheet {
Translate $text to allow it to be output as a 'comma seperated values'
format.
-=back
-
=cut
sub csv_translate {
@@ -635,6 +653,91 @@ sub csv_translate {
return $text;
}
+=pod
+
+=item * change_content_javascript():
+
+This and the next function allow you to create small sections of an
+otherwise static HTML page that you can update on the fly with
+Javascript, even in Netscape 4.
+
+The Javascript fragment returned by this function (no E<lt>scriptE<gt> tag)
+must be written to the HTML page once. It will prove the Javascript
+function "change(name, content)". Calling the change function with the
+name of the section
+you want to update, matching the name passed to C<changable_area>, and
+the new content you want to put in there, will put the content into
+that area.
+
+B<Note>: Netscape 4 only reserves enough space for the changable area
+to contain room for the original contents. You need to "make space"
+for whatever changes you wish to make, and be B<sure> to check your
+code in Netscape 4. This feature in Netscape 4 is B<not> powerful;
+it's adequate for updating a one-line status display, but little more.
+This script will set the space to 100% width, so you only need to
+worry about height in Netscape 4.
+
+Modern browsers are much less limiting, and if you can commit to the
+user not using Netscape 4, this feature may be used freely with
+pretty much any HTML.
+
+=cut
+
+sub change_content_javascript {
+ # If we're on Netscape 4, we need to use Layer-based code
+ if ($ENV{'browser.type'} eq 'netscape' &&
+ $ENV{'browser.version'} =~ /^4\./) {
+ return (<<NETSCAPE4);
+ function change(name, content) {
+ doc = document.layers[name+"___escape"].layers[0].document;
+ doc.open();
+ doc.write(content);
+ doc.close();
+ }
+NETSCAPE4
+ } else {
+ # Otherwise, we need to use semi-standards-compliant code
+ # (technically, "innerHTML" isn't standard but the equivalent
+ # is really scary, and every useful browser supports it
+ return (<<DOMBASED);
+ function change(name, content) {
+ element = document.getElementById(name);
+ element.innerHTML = content;
+ }
+DOMBASED
+ }
+}
+
+=pod
+
+=item * changable_area($name, $origContent):
+
+This provides a "changable area" that can be modified on the fly via
+the Javascript code provided in C<change_content_javascript>. $name is
+the name you will use to reference the area later; do not repeat the
+same name on a given HTML page more then once. $origContent is what
+the area will originally contain, which can be left blank.
+
+=cut
+
+sub changable_area {
+ my ($name, $origContent) = @_;
+
+ if ($ENV{'browser.type'} eq 'netscape' &&
+ $ENV{'browser.version'} =~ /^4\./) {
+ # If this is netscape 4, we need to use the Layer tag
+ return "<ilayer width='100%' id='${name}___escape' overflow='none'><layer width='100%' id='$name' overflow='none'>$origContent</layer></ilayer>";
+ } else {
+ return "<span id='$name'>$origContent</span>";
+ }
+}
+
+=pod
+
+=back
+
+=cut
+
###############################################################
## Home server <option> list generating code ##
###############################################################
@@ -679,10 +782,16 @@ See lonrights.pm for an example invocati
sub select_form {
my ($def,$name,%hash) = @_;
my $selectform = "<select name=\"$name\" size=\"1\">\n";
- foreach (sort keys %hash) {
+ my @keys;
+ if (exists($hash{'select_form_order'})) {
+ @keys=@{$hash{'select_form_order'}};
+ } else {
+ @keys=sort(keys(%hash));
+ }
+ foreach (@keys) {
$selectform.="<option value=\"$_\" ".
($_ eq $def ? 'selected' : '').
- ">".$hash{$_}."</option>\n";
+ ">".&mt($hash{$_})."</option>\n";
}
$selectform.="</select>";
return $selectform;
@@ -1420,7 +1529,10 @@ returns description of a specified langu
=cut
sub languagedescription {
- return $language{shift(@_)};
+ my $code=shift;
+ return ($supported_language{$code}?'* ':'').
+ $language{$code}.
+ ($supported_language{$code}?' ('.&mt('interface available').')':'');
}
=pod
@@ -1528,16 +1640,8 @@ sub fileextensions {
sub display_languages {
my %languages=();
- if ($ENV{'environment.languages'}) {
- foreach (split(/\s*(\,|\;|\:)\s*/,$ENV{'environment.languages'})) {
- $languages{$_}=1;
- }
- }
- if ($ENV{'course.'.$ENV{'request.course.id'}.'.languages'}) {
- foreach (split(/\s*(\,|\;|\:)\s*/,
- $ENV{'course.'.$ENV{'request.course.id'}.'.languages'})) {
- $languages{$_}=1;
- }
+ foreach (&preferred_languages()) {
+ $languages{$_}=1;
}
&get_unprocessed_cgi($ENV{'QUERY_STRING'},['displaylanguage']);
if ($ENV{'form.displaylanguage'}) {
@@ -1548,6 +1652,45 @@ sub display_languages {
return %languages;
}
+sub preferred_languages {
+ my @languages=();
+ if ($ENV{'environment.languages'}) {
+ @languages=split(/\s*(\,|\;|\:)\s*/,$ENV{'environment.languages'});
+ }
+ if ($ENV{'course.'.$ENV{'request.course.id'}.'.languages'}) {
+ @languages=(@languages,split(/\s*(\,|\;|\:)\s*/,
+ $ENV{'course.'.$ENV{'request.course.id'}.'.languages'}));
+ }
+ my $browser=(split(/\;/,$ENV{'HTTP_ACCEPT_LANGUAGE'}))[0];
+ if ($browser) {
+ @languages=(@languages,split(/\s*(\,|\;|\:)\s*/,$browser));
+ }
+ if ($Apache::lonnet::domain_lang_def{$ENV{'user.domain'}}) {
+ @languages=(@languages,
+ $Apache::lonnet::domain_lang_def{$ENV{'user.domain'}});
+ }
+ if ($Apache::lonnet::domain_lang_def{$ENV{'request.role.domain'}}) {
+ @languages=(@languages,
+ $Apache::lonnet::domain_lang_def{$ENV{'request.role.domain'}});
+ }
+ if ($Apache::lonnet::domain_lang_def{
+ $Apache::lonnet::perlvar{'lonDefDomain'}}) {
+ @languages=(@languages,
+ $Apache::lonnet::domain_lang_def{
+ $Apache::lonnet::perlvar{'lonDefDomain'}});
+ }
+# turn "en-ca" into "en-ca,en"
+ my @genlanguages;
+ foreach (@languages) {
+ unless ($_=~/\w/) { next; }
+ push (@genlanguages,$_);
+ if ($_=~/(\-|\_)/) {
+ push (@genlanguages,(split(/(\-|\_)/,$_))[0]);
+ }
+ }
+ return @genlanguages;
+}
+
###############################################################
## Student Answer Attempts ##
###############################################################
@@ -1628,7 +1771,7 @@ sub get_previous_attempt {
} else {
$value=$returnhash{$version.':'.$_};
}
- $prevattempts.='<td>'.$value.' </td>';
+ $prevattempts.='<td>'.&Apache::lonnet::unescape($value).' </td>';
}
}
}
@@ -1640,6 +1783,7 @@ sub get_previous_attempt {
} else {
$value=$lasthash{$_};
}
+ $value=&Apache::lonnet::unescape($value);
if ($_ =~/$regexp$/ && (defined &$gradesub)) {$value = &$gradesub($value)}
$prevattempts.='<td>'.$value.' </td>';
}
@@ -1697,7 +1841,7 @@ show a snapshot of what student was look
sub get_student_view {
my ($symb,$username,$domain,$courseid,$target) = @_;
- my ($map,$id,$feedurl) = split(/___/,$symb);
+ my ($map,$id,$feedurl) = &Apache::lonnet::decode_symb($symb);
my (%old,%moreenv);
my @elements=('symb','courseid','domain','username');
foreach my $element (@elements) {
@@ -1733,7 +1877,7 @@ show a snapshot of how student was answe
sub get_student_answers {
my ($symb,$username,$domain,$courseid,%form) = @_;
- my ($map,$id,$feedurl) = split(/___/,$symb);
+ my ($map,$id,$feedurl) = &Apache::lonnet::decode_symb($symb);
my (%old,%moreenv);
my @elements=('symb','courseid','domain','username');
foreach my $element (@elements) {
@@ -1752,6 +1896,30 @@ sub get_student_answers {
=pod
+=item * &submlink()
+
+Inputs: $text $uname $udom $symb
+
+Returns: A link to grades.pm such as to see the SUBM view of a student
+
+=cut
+
+###############################################
+sub submlink {
+ my ($text,$uname,$udom,$symb)=@_;
+ if (!($uname && $udom)) {
+ (my $cursymb, my $courseid,$udom,$uname)=
+ &Apache::lonxml::whichuser($symb);
+ if (!$symb) { $symb=$cursymb; }
+ }
+ if (!$symb) { $symb=&symbread(); }
+ return '<a href="/adm/grades?symb='.$symb.'&student='.$uname.
+ '&userdom='.$udom.'&command=submission">'.$text.'</a>';
+}
+##############################################
+
+=pod
+
=back
=cut
@@ -1952,6 +2120,7 @@ other decorations will be returned.
sub bodytag {
my ($title,$function,$addentries,$bodyonly,$domain,$forcereg)=@_;
+ $title=&mt($title);
unless ($function) {
$function='student';
if ($ENV{'request.role'}=~/^(cc|in|ta|ep)/) {
@@ -2180,6 +2349,14 @@ sub no_cache {
#$r->header_out("Expires" => $date);
}
+sub content_type {
+ my ($r,$type,$charset) = @_;
+ unless ($charset) {
+ $charset=&Apache::lonlocal::current_encoding;
+ }
+ $r->content_type($type.($charset?'; charset='.$charset:''));
+}
+
=pod
=item * add_to_env($name,$value)
@@ -2460,6 +2637,23 @@ sub csv_samples_select_table {
=pod
+=item clean_excel_name($name)
+
+Returns a replacement for $name which does not contain any illegal characters.
+
+=cut
+
+sub clean_excel_name {
+ my ($name) = @_;
+ $name =~ s/[:\*\?\/\\]//g;
+ if (length($name) > 31) {
+ $name = substr($name,0,31);
+ }
+ return $name;
+}
+
+=pod
+
=item * check_if_partid_hidden($id,$symb,$udom,$uname)
Returns either 1 or undef
@@ -2477,15 +2671,392 @@ $uname, optional the username of the use
sub check_if_partid_hidden {
my ($id,$symb,$udom,$uname) = @_;
- my $hiddenparts=&Apache::lonnet::EXT('resource.0.parameter_hiddenparts',
+ my $hiddenparts=&Apache::lonnet::EXT('resource.0.hiddenparts',
$symb,$udom,$uname);
+ my $truth=1;
+ #if the string starts with !, then the list is the list to show not hide
+ if ($hiddenparts=~s/^\s*!//) { $truth=undef; }
my @hiddenlist=split(/,/,$hiddenparts);
foreach my $checkid (@hiddenlist) {
- if ($checkid =~ /^\s*\Q$id\E\s*$/) { return 1; }
+ if ($checkid =~ /^\s*\Q$id\E\s*$/) { return $truth; }
}
- return undef;
+ return !$truth;
}
+
+############################################################
+############################################################
+
+=pod
+
+=head1 cgi-bin script and graphing routines
+
+=item get_cgi_id
+
+Inputs: none
+
+Returns an id which can be used to pass environment variables
+to various cgi-bin scripts. These environment variables will
+be removed from the users environment after a given time by
+the routine &Apache::lonnet::transfer_profile_to_env.
+
+=cut
+
+############################################################
+############################################################
+
+sub get_cgi_id {
+ return (time.'_'.int(rand(1000)));
+}
+
+############################################################
+############################################################
+
+=pod
+
+=item DrawBarGraph
+
+Facilitates the plotting of data in a (stacked) bar graph.
+Puts plot definition data into the users environment in order for
+graph.png to plot it. Returns an <img> tag for the plot.
+The bars on the plot are labeled '1','2',...,'n'.
+
+Inputs:
+
+=over 4
+
+=item $Title: string, the title of the plot
+
+=item $xlabel: string, text describing the X-axis of the plot
+
+=item $ylabel: string, text describing the Y-axis of the plot
+
+=item $Max: scalar, the maximum Y value to use in the plot
+If $Max is < any data point, the graph will not be rendered.
+
+=item $colors: array ref holding the colors to be used for the data sets when
+they are plotted. If undefined, default values will be used.
+
+=item @Values: An array of array references. Each array reference holds data
+to be plotted in a stacked bar chart.
+
+=back
+
+Returns:
+
+An <img> tag which references graph.png and the appropriate identifying
+information for the plot.
+
+=cut
+
+############################################################
+############################################################
+sub DrawBarGraph {
+ my ($Title,$xlabel,$ylabel,$Max,$colors,@Values)=@_;
+ #
+ if (! defined($colors)) {
+ $colors = ['#33ff00',
+ '#0033cc', '#990000', '#aaaa66', '#663399', '#ff9933',
+ '#66ccff', '#ff9999', '#cccc33', '#660000', '#33cc66',
+ ];
+ }
+ #
+ my $identifier = &get_cgi_id();
+ my $id = 'cgi.'.$identifier;
+ if (! @Values || ref($Values[0]) ne 'ARRAY') {
+ return '';
+ }
+ my $NumBars = scalar(@{$Values[0]});
+ my %ValuesHash;
+ my $NumSets=1;
+ foreach my $array (@Values) {
+ next if (! ref($array));
+ $ValuesHash{$id.'.data.'.$NumSets++} =
+ join(',',@$array);
+ }
+ #
+ my ($height,$width,$xskip,$bar_width) = (200,120,1,15);
+ if ($NumBars < 10) {
+ $width = 120+$NumBars*15;
+ $xskip = 1;
+ $bar_width = 15;
+ } elsif ($NumBars <= 25) {
+ $width = 120+$NumBars*11;
+ $xskip = 5;
+ $bar_width = 8;
+ } elsif ($NumBars <= 50) {
+ $width = 120+$NumBars*8;
+ $xskip = 5;
+ $bar_width = 4;
+ } else {
+ $width = 120+$NumBars*8;
+ $xskip = 5;
+ $bar_width = 4;
+ }
+ #
+ my @Labels;
+ for (my $i=0;$i<@{$Values[0]};$i++) {
+ push (@Labels,$i+1);
+ }
+ #
+ $Max = 1 if ($Max < 1);
+ if ( int($Max) < $Max ) {
+ $Max++;
+ $Max = int($Max);
+ }
+ $Title = '' if (! defined($Title));
+ $xlabel = '' if (! defined($xlabel));
+ $ylabel = '' if (! defined($ylabel));
+ $ValuesHash{$id.'.title'} = &Apache::lonnet::escape($Title);
+ $ValuesHash{$id.'.xlabel'} = &Apache::lonnet::escape($xlabel);
+ $ValuesHash{$id.'.ylabel'} = &Apache::lonnet::escape($ylabel);
+ $ValuesHash{$id.'.y_max_value'} = $Max;
+ $ValuesHash{$id.'.NumBars'} = $NumBars;
+ $ValuesHash{$id.'.NumSets'} = $NumSets;
+ $ValuesHash{$id.'.PlotType'} = 'bar';
+ $ValuesHash{$id.'.Colors'} = join(',',@{$colors});
+ $ValuesHash{$id.'.height'} = $height;
+ $ValuesHash{$id.'.width'} = $width;
+ $ValuesHash{$id.'.xskip'} = $xskip;
+ $ValuesHash{$id.'.bar_width'} = $bar_width;
+ $ValuesHash{$id.'.labels'} = join(',',@Labels);
+ #
+ &Apache::lonnet::appenv(%ValuesHash);
+ return '<img src="/cgi-bin/graph.png?'.$identifier.'" border="1" />';
+}
+
+############################################################
+############################################################
+
+=pod
+
+=item DrawXYGraph
+
+Facilitates the plotting of data in an XY graph.
+Puts plot definition data into the users environment in order for
+graph.png to plot it. Returns an <img> tag for the plot.
+
+Inputs:
+
+=over 4
+
+=item $Title: string, the title of the plot
+
+=item $xlabel: string, text describing the X-axis of the plot
+
+=item $ylabel: string, text describing the Y-axis of the plot
+
+=item $Max: scalar, the maximum Y value to use in the plot
+If $Max is < any data point, the graph will not be rendered.
+
+=item $colors: Array ref containing the hex color codes for the data to be
+plotted in. If undefined, default values will be used.
+
+=item $Xlabels: Array ref containing the labels to be used for the X-axis.
+
+=item $Ydata: Array ref containing Array refs.
+Each of the contained arrays will be plotted as a seperate curve.
+
+=item %Values: hash indicating or overriding any default values which are
+passed to graph.png.
+Possible values are: width, xskip, x_ticks, x_tick_offset, among others.
+
+=back
+
+Returns:
+
+An <img> tag which references graph.png and the appropriate identifying
+information for the plot.
+
+=cut
+
+############################################################
+############################################################
+sub DrawXYGraph {
+ my ($Title,$xlabel,$ylabel,$Max,$colors,$Xlabels,$Ydata,%Values)=@_;
+ #
+ # Create the identifier for the graph
+ my $identifier = &get_cgi_id();
+ my $id = 'cgi.'.$identifier;
+ #
+ $Title = '' if (! defined($Title));
+ $xlabel = '' if (! defined($xlabel));
+ $ylabel = '' if (! defined($ylabel));
+ my %ValuesHash =
+ (
+ $id.'.title' => &Apache::lonnet::escape($Title),
+ $id.'.xlabel' => &Apache::lonnet::escape($xlabel),
+ $id.'.ylabel' => &Apache::lonnet::escape($ylabel),
+ $id.'.y_max_value'=> $Max,
+ $id.'.labels' => join(',',@$Xlabels),
+ $id.'.PlotType' => 'XY',
+ );
+ #
+ if (defined($colors) && ref($colors) eq 'ARRAY') {
+ $ValuesHash{$id.'.Colors'} = join(',',@{$colors});
+ }
+ #
+ if (! ref($Ydata) || ref($Ydata) ne 'ARRAY') {
+ return '';
+ }
+ my $NumSets=1;
+ foreach my $array (@{$Ydata}){
+ next if (! ref($array));
+ $ValuesHash{$id.'.data.'.$NumSets++} = join(',',@$array);
+ }
+ $ValuesHash{$id.'.NumSets'} = $NumSets-1;
+ #
+ # Deal with other parameters
+ while (my ($key,$value) = each(%Values)) {
+ $ValuesHash{$id.'.'.$key} = $value;
+ }
+ #
+ &Apache::lonnet::appenv(%ValuesHash);
+ return '<img src="/cgi-bin/graph.png?'.$identifier.'" border="1" />';
+}
+
+############################################################
+############################################################
+
+=pod
+
+=item DrawXYYGraph
+
+Facilitates the plotting of data in an XY graph with two Y axes.
+Puts plot definition data into the users environment in order for
+graph.png to plot it. Returns an <img> tag for the plot.
+
+Inputs:
+
+=over 4
+
+=item $Title: string, the title of the plot
+
+=item $xlabel: string, text describing the X-axis of the plot
+
+=item $ylabel: string, text describing the Y-axis of the plot
+
+=item $colors: Array ref containing the hex color codes for the data to be
+plotted in. If undefined, default values will be used.
+
+=item $Xlabels: Array ref containing the labels to be used for the X-axis.
+
+=item $Ydata1: The first data set
+
+=item $Min1: The minimum value of the left Y-axis
+
+=item $Max1: The maximum value of the left Y-axis
+
+=item $Ydata2: The second data set
+
+=item $Min2: The minimum value of the right Y-axis
+
+=item $Max2: The maximum value of the left Y-axis
+
+=item %Values: hash indicating or overriding any default values which are
+passed to graph.png.
+Possible values are: width, xskip, x_ticks, x_tick_offset, among others.
+
+=back
+
+Returns:
+
+An <img> tag which references graph.png and the appropriate identifying
+information for the plot.
+
+=cut
+
+############################################################
+############################################################
+sub DrawXYYGraph {
+ my ($Title,$xlabel,$ylabel,$colors,$Xlabels,$Ydata1,$Min1,$Max1,
+ $Ydata2,$Min2,$Max2,%Values)=@_;
+ #
+ # Create the identifier for the graph
+ my $identifier = &get_cgi_id();
+ my $id = 'cgi.'.$identifier;
+ #
+ $Title = '' if (! defined($Title));
+ $xlabel = '' if (! defined($xlabel));
+ $ylabel = '' if (! defined($ylabel));
+ my %ValuesHash =
+ (
+ $id.'.title' => &Apache::lonnet::escape($Title),
+ $id.'.xlabel' => &Apache::lonnet::escape($xlabel),
+ $id.'.ylabel' => &Apache::lonnet::escape($ylabel),
+ $id.'.labels' => join(',',@$Xlabels),
+ $id.'.PlotType' => 'XY',
+ $id.'.NumSets' => 2,
+ $id.'.two_axes' => 1,
+ $id.'.y1_max_value' => $Max1,
+ $id.'.y1_min_value' => $Min1,
+ $id.'.y2_max_value' => $Max2,
+ $id.'.y2_min_value' => $Min2,
+ );
+ #
+ if (defined($colors) && ref($colors) eq 'ARRAY') {
+ $ValuesHash{$id.'.Colors'} = join(',',@{$colors});
+ }
+ #
+ if (! ref($Ydata1) || ref($Ydata1) ne 'ARRAY' ||
+ ! ref($Ydata2) || ref($Ydata2) ne 'ARRAY'){
+ return '';
+ }
+ my $NumSets=1;
+ foreach my $array ($Ydata1,$Ydata2){
+ next if (! ref($array));
+ $ValuesHash{$id.'.data.'.$NumSets++} = join(',',@$array);
+ }
+ #
+ # Deal with other parameters
+ while (my ($key,$value) = each(%Values)) {
+ $ValuesHash{$id.'.'.$key} = $value;
+ }
+ #
+ &Apache::lonnet::appenv(%ValuesHash);
+ return '<img src="/cgi-bin/graph.png?'.$identifier.'" border="1" />';
+}
+
+############################################################
+############################################################
+
+=pod
+
+=head1 Statistics helper routines?
+
+Bad place for them but what the hell.
+
+=item &chartlink
+
+Returns a link to the chart for a specific student.
+
+Inputs:
+
+=over 4
+
+=item $linktext: The text of the link
+
+=item $sname: The students username
+
+=item $sdomain: The students domain
+
+=back
+
+=cut
+
+############################################################
+############################################################
+sub chartlink {
+ my ($linktext, $sname, $sdomain) = @_;
+ my $link = '<a href="/adm/statistics?reportSelected=student_assessment'.
+ '&SelectedStudent='.&Apache::lonnet::escape($sname.':'.$sdomain).
+ '&chartoutputmode='.HTML::Entities::encode('html, with all links').
+ '">'.$linktext.'</a>';
+}
+
+############################################################
+############################################################
+
=pod
=back