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version 1.12, 2001/12/20 22:36:35	version 1.19, 2001/12/27 19:47:02
Line 26	Line 26
# http://www.lon-capa.org/	# http://www.lon-capa.org/
#	#
# 12/15/01 Matthew	# 12/15/01 Matthew
# 12/18 12/19 12/20 Matthew	# 12/17 12/18 12/19 12/20 12/21 Matthew
package Apache::lonplot;	package Apache::lonplot;

use strict;	use strict;
Line 34 use Apache::File;	Line 34 use Apache::File;
use Apache::response;	use Apache::response;
use Apache::lonxml;	use Apache::lonxml;

use Digest::MD5 qw(md5_base64);

sub BEGIN {	sub BEGIN {
&Apache::lonxml::register('Apache::lonplot',('plot'));	&Apache::lonxml::register('Apache::lonplot',('plot'));
}	}
Line 53 sub BEGIN {	Line 51 sub BEGIN {
## grid	## grid
## border	## border
## font	## font
	## align
##	##
## @labels: $labels[$i] = \%label	## @labels: $labels[$i] = \%label
## %label: text, xpos, ypos, justify	## %label: text, xpos, ypos, justify
##	##
## @curves: $curves[$i] = \%curve	## @curves: $curves[$i] = \%curve
## %curve: name, linestyle, ( function \| data )	## %curve: name, linestyle, ( function \| data )
##	##
## $curves[$i]->{'data'} = [ [x1,x2,x3,x4],	## $curves[$i]->{'data'} = [ [x1,x2,x3,x4],
## [y1,y2,y3,y4] ]	## [y1,y2,y3,y4] ]
Line 68 sub BEGIN {	Line 67 sub BEGIN {
## Tests used in checking the validitity of input	## Tests used in checking the validitity of input
##	##
my $int_test = sub {$_[0]=~s/\s+//g;$_[0]=~/^\d+$/};	my $int_test = sub {$_[0]=~s/\s+//g;$_[0]=~/^\d+$/};
my $real_test = sub {$_[0]=~s/\s+//g;$_[0]=~/^[+-]?\d\.?\d$/};	my $real_test =
	sub {$_[0]=~s/\s+//g;$_[0]=~/^[+-]?\d\.?\d([eE][+-]\d+)?$/};
my $color_test = sub {$_[0]=~s/\s+//g;$_[0]=~/^x[\da-f]{6}$/};	my $color_test = sub {$_[0]=~s/\s+//g;$_[0]=~/^x[\da-f]{6}$/};
my $onoff_test = sub {$_[0]=~/^(on\|off)$/};	my $onoff_test = sub {$_[0]=~/^(on\|off)$/};
my $key_pos_test = sub {$_[0]=~/^(top\|bottom\|right\|left\|outside\|below)+$/};	my $key_pos_test = sub {$_[0]=~/^(top\|bottom\|right\|left\|outside\|below\| )+$/};
my $sml_test = sub {$_[0]=~/^(small\|medium\|large)$/};	my $sml_test = sub {$_[0]=~/^(small\|medium\|large)$/};
my $linestyle_test = sub {$_[0]=~/^(lines\|linespoints\|dots\|points\|steps)$/};	my $linestyle_test = sub {$_[0]=~/^(lines\|linespoints\|dots\|points\|steps)$/};
my $words_test = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^(\w+ ?)+$/};	my $words_test = sub {$_[0]=~s/\s+/ /g;$_[0]=~/^([\w]+ ?)+$/};
##	##
## Default values for attributes of elements	## Default values for attributes of elements
##	##
Line 87 my %plot_defaults =	Line 87 my %plot_defaults =
transparent => {default => 'off', test => $onoff_test },	transparent => {default => 'off', test => $onoff_test },
grid => {default => 'off', test => $onoff_test },	grid => {default => 'off', test => $onoff_test },
border => {default => 'on', test => $onoff_test },	border => {default => 'on', test => $onoff_test },
font => {default => 'medium', test => $sml_test }	font => {default => 'medium', test => $sml_test },
	align => {default => 'left', test =>
	sub {$_[0]=~/^(left\|right\|center)$/} }
);	);

my %key_defaults =	my %key_defaults =
Line 111 my %axis_defaults =	Line 113 my %axis_defaults =
xmin => {default => '-10.0', test => $real_test },	xmin => {default => '-10.0', test => $real_test },
xmax => {default => ' 10.0', test => $real_test },	xmax => {default => ' 10.0', test => $real_test },
ymin => {default => '-10.0', test => $real_test },	ymin => {default => '-10.0', test => $real_test },
ymax => {default => ' 10.0', test => $real_test }	ymax => {default => ' 10.0', test => $real_test },
	linestyle => {default => 'points', test => $linestyle_test}
);	);

my %curve_defaults =	my %curve_defaults =
(	(
color => {default => 'x000000', test => $color_test },	color => {default => 'x000000', test => $color_test },
name => {default => 'x000000', test => sub {1} },#sub {$_[0]=~/^[\w ]*$/} },	name => {default => '', test => $words_test },
linestyle => {default => 'lines', test => $linestyle_test }	linestyle => {default => 'lines', test => $linestyle_test }
);	);

##	##
Line 133 sub start_plot {	Line 136 sub start_plot {
#	#
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';	my $result='';
&Apache::lonxml::register('Apache::lonplot',
('title','xlabel','ylabel','key','axis','label','curve'));
push (@Apache::lonxml::namespace,'plot');
## Always evaluate the insides of the <plot></plot> tags
my $inside = &Apache::lonxml::get_all_text("/plot",$$parser[-1]);
$inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
&Apache::lonxml::newparser($parser,\$inside);
##-------------------------------------------------------
&get_attributes(\%plot,\%plot_defaults,$parstack,$safeeval,
$tagstack->[-1]);
if ($target eq 'web') {	if ($target eq 'web') {
	&Apache::lonxml::register('Apache::lonplot',
	('title','xlabel','ylabel','key','axis','label','curve'));
	push (@Apache::lonxml::namespace,'plot');
	## Always evaluate the insides of the <plot></plot> tags
	my $inside = &Apache::lonxml::get_all_text("/plot",$$parser[-1]);
	$inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
	&Apache::lonxml::newparser($parser,\$inside);
	##-------------------------------------------------------
	&get_attributes(\%plot,\%plot_defaults,$parstack,$safeeval,
	$tagstack->[-1]);
}	}
return '';	return '';
}	}
Line 155 sub end_plot {	Line 158 sub end_plot {
('title','xlabel','ylabel','key','axis','label','curve'));	('title','xlabel','ylabel','key','axis','label','curve'));
my $result = '';	my $result = '';
if ($target eq 'web') {	if ($target eq 'web') {
## Determine filename -- Need to use the 'id' thingy that Gerd	##
## mentioned.	## Make sure we have all the input we need:
	if (! defined(%plot )) { &set_defaults(\%plot,\%plot_defaults); }
	if (! defined(%key )) {} # No key for this plot
	if (! defined(%axis )) { &set_defaults(\%axis,\%axis_defaults); }
	if (! defined($title )) {} # No title for this plot
	if (! defined($xlabel)) {} # No xlabel for this plot
	if (! defined($ylabel)) {} # No ylabel for this plot
	if ($#labels < 0) { } # No labels for this plot
	if ($#curves < 0) {
	&Apache::lonxml::warning("No curves specified for plot!!!!");
	return '';
	}
	my $curve;
	foreach $curve (@curves) {
	if (!defined($curve->{'function'})&&!defined($curve->{'data'})){
	&Apache::lonxml::warning("One of the curves specified did not contain any <data> or <function> declarations\n");
	return '';
	}
	}
	##
	## Determine filename
my $tmpdir = '/home/httpd/perl/tmp/';	my $tmpdir = '/home/httpd/perl/tmp/';
my $filename = $ENV{'user.name'}.'_'.$ENV{'user.domain'}.	my $filename = $ENV{'user.name'}.'_'.$ENV{'user.domain'}.
'_plot.data';	'_'.time.'_'.$$.'_plot.data';
## Write the plot description to the file	## Write the plot description to the file
my $fh=Apache::File->new(">$tmpdir$filename");	my $fh=Apache::File->new(">$tmpdir$filename");
$result .= '<pre>';
$result .= $filename.$/;
print $fh &write_gnuplot_file();	print $fh &write_gnuplot_file();
$result .= '</pre>'.$/;	close($fh);
## return image tag for the plot	## return image tag for the plot
$result .= <<"ENDIMAGE";	$result .= <<"ENDIMAGE";
<img src = "/cgi-bin/plot.gif?$filename"	<img src = "/cgi-bin/plot.gif?$filename"
alt = "/cgi-bin/plot.gif?$filename" />	width = "$plot{'width'}"
	height = "$plot{'height'}"
	align = "$plot{'align'}"
	alt = "/cgi-bin/plot.gif?$filename" />
ENDIMAGE	ENDIMAGE
}	}
return $result;	return $result;
Line 179 ENDIMAGE	Line 203 ENDIMAGE
sub start_key {	sub start_key {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';	my $result='';
&get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
$tagstack->[-1]);
if ($target eq 'web') {	if ($target eq 'web') {
	&get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
	$tagstack->[-1]);
# This routine should never return anything.	# This routine should never return anything.
}	}
return $result;	return $result;
Line 198 sub end_key {	Line 222 sub end_key {
##------------------------------------------------------------------- title	##------------------------------------------------------------------- title
sub start_title {	sub start_title {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
$title = &Apache::lonxml::get_all_text("/title",$$parser[-1]);
my $result='';	my $result='';
if ($target eq 'web') {	if ($target eq 'web') {
	$title = &Apache::lonxml::get_all_text("/title",$$parser[-1]);
# This routine should never return anything.	# This routine should never return anything.
}	}
return $result;	return $result;
Line 218 sub end_title {	Line 242 sub end_title {
sub start_xlabel {	sub start_xlabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';	my $result='';
$xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
if ($target eq 'web') {	if ($target eq 'web') {
	$xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
# This routine should never return anything.	# This routine should never return anything.
}	}
return $result;	return $result;
Line 237 sub end_xlabel {	Line 261 sub end_xlabel {
sub start_ylabel {	sub start_ylabel {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';	my $result='';
$ylabel = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
if ($target eq 'web') {	if ($target eq 'web') {
	$ylabel = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
# This routine should never return anything.	# This routine should never return anything.
}	}
return $result;	return $result;
Line 256 sub end_ylabel {	Line 280 sub end_ylabel {
sub start_label {	sub start_label {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';	my $result='';
my %label;
&get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
$tagstack->[-1]);
$label{'text'} = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
if (! &$words_test($label{'text'})) {
# I should probably warn about it, too.
$label{'text'} = 'Illegal text';
}
push(@labels,\%label);
if ($target eq 'web') {	if ($target eq 'web') {
# This routine should never return anything.	my %label;
	&get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
	$tagstack->[-1]);
	$label{'text'} = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
	if (! &$words_test($label{'text'})) {
	# I should probably warn about it, too.
	$label{'text'} = 'Illegal text';
	}
	push(@labels,\%label);
}	}
	# This routine should never return anything.
return $result;	return $result;
}	}

Line 284 sub end_label {	Line 308 sub end_label {
sub start_curve {	sub start_curve {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';	my $result='';
my %curve;
&get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
$tagstack->[-1]);
push (@curves,\%curve);
&Apache::lonxml::register('Apache::lonplot',('function','data'));
push (@Apache::lonxml::namespace,'curve');
if ($target eq 'web') {	if ($target eq 'web') {
	my %curve;
	&get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
	$tagstack->[-1]);
	push (@curves,\%curve);
	&Apache::lonxml::register('Apache::lonplot',('function','data'));
	push (@Apache::lonxml::namespace,'curve');
# This routine should never return anything.	# This routine should never return anything.
}	}
return $result;	return $result;
Line 299 sub start_curve {	Line 323 sub start_curve {
sub end_curve {	sub end_curve {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result = '';	my $result = '';
pop @Apache::lonxml::namespace;
&Apache::lonxml::deregister('Apache::lonplot',('function','data'));
if ($target eq 'web') {	if ($target eq 'web') {
	pop @Apache::lonxml::namespace;
	&Apache::lonxml::deregister('Apache::lonplot',('function','data'));
# This routine should never return anything.	# This routine should never return anything.
}	}
return $result;	return $result;
Line 310 sub end_curve {	Line 334 sub end_curve {
sub start_function {	sub start_function {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';	my $result='';
if (exists($curves[-1]->{'data'})) {
&Apache::lonxml::warning('Use of <function> precludes use of <data>. The <data> will be omitted in favor of the <function> declaration.');
delete $curves[-1]->{'data'} ;
}
$curves[-1]->{'function'} =
&Apache::lonxml::get_all_text("/function",$$parser[-1]);
if ($target eq 'web') {	if ($target eq 'web') {
	if (exists($curves[-1]->{'data'})) {
	&Apache::lonxml::warning('Use of <function> precludes use of <data>. The <data> will be omitted in favor of the <function> declaration.');
	delete $curves[-1]->{'data'} ;
	}
	$curves[-1]->{'function'} =
	&Apache::lonxml::get_all_text("/function",$$parser[-1]);
# This routine should never return anything.	# This routine should never return anything.
}	}
return $result;	return $result;
Line 334 sub end_function {	Line 358 sub end_function {
sub start_data {	sub start_data {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';	my $result='';
if (exists($curves[-1]->{'function'})) {
&Apache::lonxml::warning('Use of <data> precludes use of <function>.'.
' The <function> will be omitted in favor of the <data>'.
' declaration.');
delete($curves[-1]->{'function'});
}
my $datatext = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
$datatext =~ s/\s+//g; # No whitespace, numbers must be seperated
# by commas
if ($datatext !~ /^(([+-]?\d\.?\d)[, ]?)+$/) {
&Apache::lonxml::warning('Malformed data: '.$datatext);
$datatext = '';
}
# Need to do some error checking on the @data array -
# make sure it's all numbers and make sure each array
# is of the same length.
my @data = split /,/,$datatext;
for (my $i=0;$i<=$#data;$i++) {
# Check that it's non-empty
# Check that it's a number
# Maybe I need a 'debug=on' switch to list the data set
# out in a warning?
}
push @{$curves[-1]->{'data'}},\@data;
if ($target eq 'web') {	if ($target eq 'web') {
	if (exists($curves[-1]->{'function'})) {
	&Apache::lonxml::warning('Use of <data> precludes use of .'.
	'<function>. The <function> will be omitted in favor of '.
	'the <data> declaration.');
	delete($curves[-1]->{'function'});
	}
	my $datatext = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
	$datatext =~ s/\s+/ /g;
	# Need to do some error checking on the @data array -
	# make sure it's all numbers and make sure each array
	# is of the same length.
	my @data;
	if ($datatext =~ /,/) {
	@data = split /,/,$datatext;
	} else { # Assume it's space seperated.
	@data = split / /,$datatext;
	}
	for (my $i=0;$i<=$#data;$i++) {
	# Check that it's non-empty
	if (! defined($data[$i])) {
	&Apache::lonxml::warning(
	'undefined <data> value. Replacing with '.
	' pi/e = 1.15572734979092');
	$data[$i] = 1.15572734979092;
	}
	# Check that it's a number
	if (! &$real_test($data[$i]) & ! &$int_test($data[$i])) {
	&Apache::lonxml::warning(
	'Bad <data> value of '.$data[$i].' Replacing with '.
	' pi/e = 1.15572734979092');
	$data[$i] = 1.15572734979092;
	}
	}
	push @{$curves[-1]->{'data'}},\@data;
# This routine should never return anything.	# This routine should never return anything.
}	}
return $result;	return $result;
Line 377 sub end_data {	Line 411 sub end_data {
sub start_axis {	sub start_axis {
my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;	my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
my $result='';	my $result='';
&get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
$tagstack->[-1]);
if ($target eq 'web') {	if ($target eq 'web') {
	&get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
	$tagstack->[-1]);
# This routine should never return anything.	# This routine should never return anything.
}	}
return $result;	return $result;
Line 394 sub end_axis {	Line 428 sub end_axis {
return $result;	return $result;
}	}

	##----------------------------------------------------------- set_defaults
	sub set_defaults {
	my $var = shift;
	my $defaults = shift;
	my $key;
	foreach $key (keys %$defaults) {
	$var->{$key} = $defaults->{$key}->{'default'};
	}
	}

##------------------------------------------------------------------- misc	##------------------------------------------------------------------- misc
sub get_attributes{	sub get_attributes{
my $values = shift;	my $values = shift;
Line 401 sub get_attributes{	Line 445 sub get_attributes{
my $parstack = shift;	my $parstack = shift;
my $safeeval = shift;	my $safeeval = shift;
my $tag = shift;	my $tag = shift;
my $attr;	foreach my $attr (keys %{$defaults}) {
foreach $attr (keys %{$defaults}) {
$values->{$attr} =	$values->{$attr} =
&Apache::lonxml::get_param($attr,$parstack,$safeeval);	&Apache::lonxml::get_param($attr,$parstack,$safeeval);
if ($values->{$attr} eq '' \| !defined($values->{$attr})) {	if ($values->{$attr} eq '' \| !defined($values->{$attr})) {
$values->{$attr} = $defaults->{$attr}->{'default'};	$values->{$attr} = $defaults->{$attr}->{'default'};
next;	next;
Line 419 sub get_attributes{	Line 462 sub get_attributes{
}	}
return ;	return ;
}	}
	##------------------------------------------------------- write_gnuplot_file
sub write_gnuplot_file {	sub write_gnuplot_file {
my $gnuplot_input = '';	my $gnuplot_input = '';
my $curve;	my $curve;
Line 427 sub write_gnuplot_file {	Line 470 sub write_gnuplot_file {
my @Colors;	my @Colors;
push @Colors, $plot{'bgcolor'};	push @Colors, $plot{'bgcolor'};
push @Colors, $plot{'fgcolor'};	push @Colors, $plot{'fgcolor'};
push @Colors, $axis{'color'};	push @Colors, (defined($axis{'color'})?$axis{'color'}:$plot{'fgcolor'});
push @Colors, $axis{'color'};
foreach $curve (@curves) {	foreach $curve (@curves) {
push @Colors, ($curve->{'color'} ne '' ?	push @Colors, ($curve->{'color'} ne '' ?
$curve->{'color'} :	$curve->{'color'} :
$plot{'fgcolor'} );	$plot{'fgcolor'} );
}	}
# set term	# set term
$gnuplot_input .= 'set term gif ';	$gnuplot_input .= 'set term gif ';
Line 446 sub write_gnuplot_file {	Line 488 sub write_gnuplot_file {
$gnuplot_input .= ($plot{'border'} eq 'on'?	$gnuplot_input .= ($plot{'border'} eq 'on'?
'set border'.$/ :	'set border'.$/ :
'set noborder'.$/ ); # title, xlabel, ylabel	'set noborder'.$/ ); # title, xlabel, ylabel
{	$gnuplot_input .= "set output\n";
$gnuplot_input .= <<"ENDLABELS";	$gnuplot_input .= "set title \"$title\"\n" if (defined($title)) ;
set output	$gnuplot_input .= "set xlabel \"$xlabel\"\n" if (defined($xlabel));
set title "$title"	$gnuplot_input .= "set ylabel \"$ylabel\"\n" if (defined($ylabel));
set xlabel "$xlabel"	if (defined(%axis)) {
set ylabel "$ylabel"	$gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
set xrange \[$axis{'xmin'}:$axis{'xmax'}\]	$gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
set yrange \[$axis{'ymin'}:$axis{'ymax'}\]
ENDLABELS
}	}
# Key	# Key
if (defined($key{'pos'})) {	if (defined(%key)) {
$gnuplot_input .= 'set key '.$key{'pos'}.' ';	$gnuplot_input .= 'set key '.$key{'pos'}.' ';
if ($key{'title'} ne '') {	if ($key{'title'} ne '') {
$gnuplot_input .= 'title "'.$key{'title'}.'" ';	$gnuplot_input .= 'title "'.$key{'title'}.'" ';
Line 465 ENDLABELS	Line 505 ENDLABELS
$gnuplot_input .= ($key{'box'} eq 'on' ? 'box ' : 'nobox ').$/;	$gnuplot_input .= ($key{'box'} eq 'on' ? 'box ' : 'nobox ').$/;
} else {	} else {
$gnuplot_input .= 'set nokey'.$/;	$gnuplot_input .= 'set nokey'.$/;
}	}
# labels	# labels
my $label;	my $label;
foreach $label (@labels) {	foreach $label (@labels) {

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	Added in v.1.19