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Diff for /loncom/xml/lonplot.pm between versions 1.13 and 1.63

version 1.13, 2001/12/21 15:27:29 version 1.63, 2002/03/22 20:05:19
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 12/27 12/28 12/30 12/31 Matthew
   # 01/01/02 Matthew
   # 01/02 01/03 01/04 01/07 01/08 01/09 Matthew
   # 01/21 02/05 02/06 2/28Matthew
   
 package Apache::lonplot;  package Apache::lonplot;
   
 use strict;  use strict;
 use Apache::File;  use Apache::File;
 use Apache::response;  use Apache::response;
 use Apache::lonxml;  use Apache::lonxml;
   use Apache::edit;
   
 use Digest::MD5 qw(md5_base64);  BEGIN {
     &Apache::lonxml::register('Apache::lonplot',('gnuplot'));
 sub BEGIN {  
   &Apache::lonxml::register('Apache::lonplot',('plot'));  
 }  }
   
 ##   ## 
Line 53  sub BEGIN { Line 56  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] ]
 ##  ##
 ##------------------------------------------------------------  
 ##  ###################################################################
 ## Tests used in checking the validitity of input  ##                                                               ##
 ##  ##        Tests used in checking the validitity of input         ##
   ##                                                               ##
   ###################################################################
   
   my $max_str_len = 50;    # if a label, title, xlabel, or ylabel text
                            # is longer than this, it will be truncated.
   
   my %linestyles = 
       (
        lines          => 2,     # Maybe this will be used in the future
        linespoints    => 2,     # to check on whether or not they have 
        dots    => 2,     # supplied enough <data></data> fields
        points         => 2,     # to use the given line style.  But for
        steps    => 2,     # now there are more important things 
        fsteps    => 2,     # for me to deal with.
        histeps        => 2,
        errorbars    => 3,
        xerrorbars    => [3,4],
        yerrorbars    => [3,4],
        xyerrorbars    => [4,6],
        boxes          => 3,
        vector    => 4
       );    
   
 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 $pos_real_test  =
       sub {$_[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 $linestyle_test = sub {exists($linestyles{$_[0]})};
 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  ###################################################################
 ##  ##                                                               ##
 my %plot_defaults =   ##                      Attribute metadata                       ##
   ##                                                               ##
   ###################################################################
   my @gnuplot_edit_order = 
       qw/bgcolor fgcolor height width font transparent grid border align/;
   
   my $gnuplot_help_text = <<"ENDPLOTHELP";
   <p>
   The <b>gnuplot</b> tag allows an author to design a plot which can
   be created on the fly.  This is intended for use in homework problems
   where each student needs to see a distinct plot.  It can be used in
   conjunction with a <b>script</b> tag to generate random plots.
   </p><p>
   A <b>gnuplot</b> tag can contain the following sub-tags:
   </p>
   <dl>
   <dt> Plot Label
       <dd> Allows you to place text at a given (x,y) coordinate on the plot.
   <dt> Plot Title
       <dd> The title of the plot
   <dt> Plot Xlabel
       <dd> The label on the horizontal axis of the plot
   <dt> Plot Ylabel
       <dd> The label on the vertical axis of the plot
   <dt> Plot Axes
       <dd> allows specification of the x and y ranges displayed in the plot
   <dt> Plot Key
       <dd> Lists the functions displayed in the plot.
   <dt> Plot Curve
       <dd> Sets the data used in the plot.
   <dt> Plot Tics
       <dd> Allows specification of the x and y coordinate 'tics' on the axes.
   This is mostly used to adjust the grid lines when a grid is displayed.
   </dl>
   If you are having trouble with your plot, please read the help
   available on Plot Curve.
   ENDPLOTHELP
   
   my %gnuplot_defaults = 
     (      (
      height       => {default => 200,       test => $int_test   },       height       => {
      width        => {default => 200,       test => $int_test   },   default     => 200,
      bgcolor      => {default => 'xffffff', test => $color_test },   test        => $int_test,
      fgcolor      => {default => 'x000000', test => $color_test },   description => 'height of image (pixels)',
      transparent  => {default => 'off',     test => $onoff_test },        edit_type   => 'entry',
      grid         => {default => 'off',     test => $onoff_test },   size        => '10'
      border       => {default => 'on',      test => $onoff_test },   },
      font         => {default => 'medium',  test => $sml_test   }       width        => {
    default     => 200,
    test        => $int_test,
    description => 'width of image (pixels)',
    edit_type   => 'entry',
    size        => '10'
    },
        bgcolor      => {
    default     => 'xffffff',
    test        => $color_test, 
    description => 'background color of image (xffffff)',
    edit_type   => 'entry',
    size        => '10'
    },
        fgcolor      => {
    default     => 'x000000',
    test        => $color_test,
    description => 'foreground color of image (x000000)',
    edit_type   => 'entry',
    size        => '10'
    },
        transparent  => {
    default     => 'off',
    test        => $onoff_test, 
    description => 'Transparent image',
    edit_type   => 'onoff'
    },
        grid         => {
    default     => 'off',
    test        => $onoff_test, 
    description => 'Display grid',
    edit_type   => 'onoff'
    },
        border       => {
    default     => 'on',
    test        => $onoff_test, 
    description => 'Draw border around plot',
    edit_type   => 'onoff'
    },
        font         => {
    default     => 'medium',
    test        => $sml_test,
    description => 'Size of font to use',
    edit_type   => 'choice',
    choices     => ['small','medium','large']
    },
        align        => {
    default     => 'left',
    test        => sub {$_[0]=~/^(left|right|center)$/},
    description => 'alignment for image in html',
    edit_type   => 'choice',
    choices     => ['left','right','center']
    } 
      );       );
   
 my %key_defaults =   my %key_defaults = 
     (      (
      title => { default => '',          test => $words_test   },       title => { 
      box   => { default => 'off',       test => $onoff_test   },   default => '',
      pos   => { default => 'top right', test => $key_pos_test }   test => $words_test,
    description => 'Title of key',
    edit_type   => 'entry',
    size        => '40'
    },
        box   => { 
    default => 'off',
    test => $onoff_test,
    description => 'Draw a box around the key?',
    edit_type   => 'onoff'
    },
        pos   => { 
    default => 'top right', 
    test => $key_pos_test, 
    description => 'position of the key on the plot',
    edit_type   => 'choice',
    choices     => ['top left','top right','bottom left','bottom right',
    'outside','below']
    }
      );       );
   
 my %label_defaults =   my %label_defaults = 
     (      (
      xpos    => {default => 0,         test => $real_test     },       xpos    => {
      ypos    => {default => 0,         test => $real_test     },   default => 0,
      justify => {default => 'left',       test => $real_test,
                  test => sub {$_[0]=~/^(left|right|center)$/} }   description => 'x position of label (graph coordinates)',
    edit_type   => 'entry',
    size        => '10'
    },
        ypos    => {
    default => 0, 
    test => $real_test,
    description => 'y position of label (graph coordinates)',
    edit_type   => 'entry',
    size        => '10'
    },
        justify => {
    default => 'left',    
    test => sub {$_[0]=~/^(left|right|center)$/},
    description => 'justification of the label text on the plot',
    edit_type   => 'choice',
    choices     => ['left','right','center']
        }
        );
   
   my @tic_edit_order = ('location','mirror','start','increment','end');
   my %tic_defaults =
       (
        location => {
    default => 'border', 
    test => sub {$_[0]=~/^(border|axis)$/},
    description => 'Location of tick marks',
    edit_type   => 'choice',
    choices     => ['border','axis']
    },
        mirror => {
    default => 'on', 
    test => $onoff_test,
    description => 'mirror ticks on opposite axis?',
    edit_type   => 'onoff'
    },
        start => {
    default => '-10.0',
    test => $real_test,
    description => 'Start ticks at',
    edit_type   => 'entry',
    size        => '10'
    },
        increment => {
    default => '1.0',
    test => $real_test,
    description => 'Place a tick every',
    edit_type   => 'entry',
    size        => '10'
    },
        end => {
    default => ' 10.0',
    test => $real_test,
    description => 'Stop ticks at ',
    edit_type   => 'entry',
    size        => '10'
    },
      );       );
   
 my %axis_defaults =   my %axis_defaults = 
     (      (
      color     => {default => 'x000000', test => $color_test},       color   => {
      xmin      => {default => '-10.0',   test => $real_test },   default => 'x000000', 
      xmax      => {default => ' 10.0',   test => $real_test },   test => $color_test,
      ymin      => {default => '-10.0',   test => $real_test },   description => 'color of axes (x000000)',
      ymax      => {default => ' 10.0',   test => $real_test }   edit_type   => 'entry',
    size        => '10'
    },
        xmin      => {
    default => '-10.0',
    test => $real_test,
    description => 'minimum x-value shown in plot',
    edit_type   => 'entry',
    size        => '10'
    },
        xmax      => {
    default => ' 10.0',
    test => $real_test,
    description => 'maximum x-value shown in plot',  
    edit_type   => 'entry',
    size        => '10'
    },
        ymin      => {
    default => '-10.0',
    test => $real_test,
    description => 'minimum y-value shown in plot',  
    edit_type   => 'entry',
    size        => '10'
    },
        ymax      => {
    default => ' 10.0',
    test => $real_test,
    description => 'maximum y-value shown in plot',  
    edit_type   => 'entry',
    size        => '10'
    }
      );       );
   
   my $curve_help_text = <<"ENDCURVEHELP";
   The <b>curve</b> tag is where you set the data to be plotted by gnuplot.
   There are two ways of entering the information:
   <dl>
       <dt> Curve Data
       <dd> Using a <b>data</b> tag you can specify the numbers used to produce 
   the plot.  
   <p>
   By default, two <b>data</b> tags will be available in a plot.  The
   first will specify X coordinates of the data and the second will
   give the Y coordinates of the data.  When working with a linestyle that 
   requires more than two data sets, inserting another <b>data</b> tag is
   required.  Unfortunately, you must make sure the <b>data</b> tags appear
   in the order gnuplot expects the data.
   </p><p>
   Specifying the data should usually be done with a perl variable or array, 
   such as \@Xdata and \@Ydata.  You may also specify numerical data seperated 
   by commas.  Again, the order of the <b>data</b> tags is important.  The
   first tag will be the X data and the second will be the Y data.
   </p>
       <dt> Curve Function
       <dd> The <b>function</b> tag allows you to specify the curve to be 
   plotted as a formula that gnuplot can understand.  <b>Be careful using this
   tag.</b>  It is surprisingly easy to give gnuplot a function it cannot deal
   with properly.  Be explicit: 2*sin(2*3.141592*x/4) will work but
   2sin(2*3.141592x/4) will not.  If you do not receive any errors in the
   gnuplot data but still do not have an image produced, it is likely there
   is an error in your <b>function</b> tag.
   </dl>
   ENDCURVEHELP
   
   my @curve_edit_order = ('color','name','linestyle','pointtype','pointsize');
   
 my %curve_defaults =   my %curve_defaults = 
     (      (
      color     => {default => 'x000000', test => $color_test     },       color     => {
      name      => {default => '',        test => $words_test     },   default => 'x000000',
      linestyle => {default => 'lines',   test => $linestyle_test }   test => $color_test,
    description => 'color of curve (x000000)',
    edit_type   => 'entry',
    size        => '10'
    },
        name      => {
    default => '',
    test => $words_test,
    description => 'name of curve to appear in key',
    edit_type   => 'entry',
    size        => '20'
    },
        linestyle => {
    default => 'lines',
    test => $linestyle_test,
    description => 'Line style',
    edit_type   => 'choice',
    choices     => [keys(%linestyles)]
    },
   # gnuplots term=gif driver does not handle linewidth :(
   #     linewidth => {
   #         default     => 1,
   #         test        => $int_test,
   #         description => 'Line width (may not apply to all line styles)',
   #         edit_type   => 'choice',
   #         choices     => [1,2,3,4,5,6,7,8,9,10]
   #         },
        pointsize => {
            default     => 1,
            test        => $pos_real_test,
            description => 'point size (may not apply to all line styles)',
            edit_type   => 'entry',
            size        => '5'
            },
        pointtype => {
            default     => 1,
            test        => $int_test,
            description => 'point type (may not apply to all line styles)',
            edit_type   => 'choice',
            choices     => [0,1,2,3,4,5,6]
            }
      );       );
   
 ##  ###################################################################
 ## End of defaults  ##                                                               ##
 ##  ##                    parsing and edit rendering                 ##
 my (%plot,%key,%axis,$title,$xlabel,$ylabel,@labels,@curves);  ##                                                               ##
   ###################################################################
   my (%plot,%key,%axis,$title,$xlabel,$ylabel,@labels,@curves,%xtics,%ytics);
   
 sub start_plot {  sub start_gnuplot {
     %plot    = undef;   %key     = undef;   %axis   = undef;       %plot    = ();      %key     = ();      %axis   = (); 
     $title   = undef;   $xlabel  = undef;   $ylabel = undef;      $title   = undef;   $xlabel  = undef;   $ylabel = undef;
     $#labels = -1;      $#curves = -1;      $#labels = -1;      $#curves = -1;
       %xtics    = ();      %ytics    = ();
     #      #
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';      my $result='';
     &Apache::lonxml::register('Apache::lonplot',      &Apache::lonxml::register('Apache::lonplot',
      ('title','xlabel','ylabel','key','axis','label','curve'));       ('title','xlabel','ylabel','key','axis','label','curve',
     push (@Apache::lonxml::namespace,'plot');        'xtics','ytics'));
     ## Always evaluate the insides of the <plot></plot> tags      push (@Apache::lonxml::namespace,'lonplot');
     my $inside = &Apache::lonxml::get_all_text("/plot",$$parser[-1]);      if ($target eq 'web' || $target eq 'tex') {
     $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);   &get_attributes(\%plot,\%gnuplot_defaults,$parstack,$safeeval,
     &Apache::lonxml::newparser($parser,\$inside);   $tagstack->[-1]);
     ##-------------------------------------------------------      } elsif ($target eq 'edit') {
     &get_attributes(\%plot,\%plot_defaults,$parstack,$safeeval,   $result .= &Apache::edit::tag_start($target,$token,'GnuPlot');
     $tagstack->[-1]);   $result .= &make_javascript();
     if ($target eq 'web') {   $result .= &help_win($gnuplot_help_text);
    $result .= &edit_attributes($target,$token,\%gnuplot_defaults,
       \@gnuplot_edit_order);
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args
       ($token,$parstack,$safeeval,keys(%gnuplot_defaults));
    if ($constructtag) {
       $result = &Apache::edit::rebuild_tag($token);
    }
     }      }
     return '';      return $result;
 }  }
   
 sub end_plot {  sub end_gnuplot {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     pop @Apache::lonxml::namespace;      pop @Apache::lonxml::namespace;
     &Apache::lonxml::deregister('Apache::lonplot',      &Apache::lonxml::deregister('Apache::lonplot',
  ('title','xlabel','ylabel','key','axis','label','curve'));   ('title','xlabel','ylabel','key','axis','label','curve'));
     my $result = '';      my $result = '';
     if ($target eq 'web') {      my $randnumber;
  ##      # need to call rand everytime start_script would evaluate, as the
  ## Make sure we have all the input we need:      # safe space rand number generator and the global rand generator 
  if (! defined(%plot  )) { &set_defaults(\%plot,\%plot_defaults); }      # are not seperate
  if (! defined(%key   )) {} # No key for this plot       if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
  if (! defined(%axis  )) { &set_defaults(\%axis,\%axis_defaults); }   $target eq 'answer') {
  if (! defined($title )) {} # No title for this plot         $randnumber=int(rand(1000));
  if (! defined($xlabel)) {} # No xlabel for this plot       }
  if (! defined($ylabel)) {} # No ylabel for this plot       if ($target eq 'web' || $target eq 'tex') {
  if ($#labels < 0) { } # No labels for this plot   &check_inputs(); # Make sure we have all the data we need
  if ($#curves < 0) { } # This is an error  
  ##   ##
  ## Determine filename   ## 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'}.
     '_'.time.'_'.$$.'_plot.data';      '_'.time.'_'.$$.$randnumber.'_plot.data';
  ## Write the plot description to the file   ## Write the plot description to the file
  my $fh=Apache::File->new(">$tmpdir$filename");   &write_gnuplot_file($tmpdir,$filename,$target);
  $result .= '<pre>';   $filename = &Apache::lonnet::escape($filename);
  $result .= $filename.$/;  
  print $fh &write_gnuplot_file();  
  $result .= '</pre>'.$/;  
  ## return image tag for the plot   ## return image tag for the plot
  $result .= <<"ENDIMAGE";   if ($target eq 'web') {
 <img src = "/cgi-bin/plot.gif?$filename"       $result .= <<"ENDIMAGE";
      alt = "/cgi-bin/plot.gif?$filename" />  <img src    = "/cgi-bin/plot.gif?file=$filename&output=gif" 
        width  = "$plot{'width'}" 
        height = "$plot{'height'}"
        align  = "$plot{'align'}"
        alt    = "image should be /cgi-bin/plot.gif?$filename" />
 ENDIMAGE  ENDIMAGE
           } elsif ($target eq 'tex') {
       &Apache::lonnet::ssi('cgi-bin/plot.gif?file=$filename'.
    '&output=eps');
       $result = "$filename.eps";
    }
       } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_end($target,$token);
       }
       return $result;
   }
   
   
   ##--------------------------------------------------------------- xtics
   sub start_xtics {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
       my $result='';
       if ($target eq 'web' || $target eq 'tex') {
    &get_attributes(\%xtics,\%tic_defaults,$parstack,$safeeval,
       $tagstack->[-1]);
       } elsif ($target eq 'edit') {
    $result .= &Apache::edit::tag_start($target,$token,'xtics');
    $result .= &edit_attributes($target,$token,\%tic_defaults,
       \@tic_edit_order);
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args
       ($token,$parstack,$safeeval,keys(%tic_defaults));
    if ($constructtag) {
       $result = &Apache::edit::rebuild_tag($token);
    }
       }
       return $result;
   }
   
   sub end_xtics {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
       my $result = '';
       if ($target eq 'web' || $target eq 'tex') {
       } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_end($target,$token);
       }
       return $result;
   }
   
   ##--------------------------------------------------------------- ytics
   sub start_ytics {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
       my $result='';
       if ($target eq 'web' || $target eq 'tex') {
    &get_attributes(\%ytics,\%tic_defaults,$parstack,$safeeval,
       $tagstack->[-1]);
       } elsif ($target eq 'edit') {
    $result .= &Apache::edit::tag_start($target,$token,'ytics');
    $result .= &edit_attributes($target,$token,\%tic_defaults,
       \@tic_edit_order);
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args
       ($token,$parstack,$safeeval,keys(%tic_defaults));
    if ($constructtag) {
       $result = &Apache::edit::rebuild_tag($token);
    }
       }
       return $result;
   }
   
   sub end_ytics {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
       my $result = '';
       if ($target eq 'web' || $target eq 'tex') {
       } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_end($target,$token);
     }      }
     return $result;      return $result;
 }  }
   
   
 ##----------------------------------------------------------------- key  ##----------------------------------------------------------------- key
 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,$safeeval,      if ($target eq 'web' || $target eq 'tex') {
    &get_attributes(\%key,\%key_defaults,$parstack,$safeeval,
     $tagstack->[-1]);      $tagstack->[-1]);
     if ($target eq 'web') {      } elsif ($target eq 'edit') {
  # This routine should never return anything.   $result .= &Apache::edit::tag_start($target,$token,'Plot Key');
    $result .= &edit_attributes($target,$token,\%key_defaults);
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args
       ($token,$parstack,$safeeval,keys(%key_defaults));
    if ($constructtag) {
       $result = &Apache::edit::rebuild_tag($token);
    }
     }      }
     return $result;      return $result;
 }  }
Line 200  sub start_key { Line 587  sub start_key {
 sub end_key {  sub end_key {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';      my $result = '';
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.      } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_end($target,$token);
     }      }
     return $result;      return $result;
 }  }
   
 ##------------------------------------------------------------------- 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",$$parser[-1]);  
     my $result='';      my $result='';
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.   $title = &Apache::lonxml::get_all_text("/title",$$parser[-1]);
    $title=&Apache::run::evaluate($title,$safeeval,$$parstack[-1]);
    $title =~ s/\n/ /g;
    if (length($title) > $max_str_len) {
       $title = substr($title,0,$max_str_len);
    }
       } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_start($target,$token,'Plot Title');
    my $text=&Apache::lonxml::get_all_text("/title",$$parser[-1]);
    $result.=&Apache::edit::end_row().
       &Apache::edit::start_spanning_row().
       &Apache::edit::editline('',$text,'',60);
       } elsif ($target eq 'modified') {
    my $text=$$parser[-1]->get_text("/title");
    $result.=&Apache::edit::rebuild_tag($token);
    $result.=&Apache::edit::modifiedfield($token);
     }      }
     return $result;      return $result;
 }  }
Line 219  sub start_title { Line 622  sub start_title {
 sub end_title {  sub end_title {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';      my $result = '';
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.      } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_end($target,$token);
     }      }
     return $result;      return $result;
 }  }
Line 228  sub end_title { Line 632  sub end_title {
 sub start_xlabel {  sub start_xlabel {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result='';      my $result='';
     $xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);      if ($target eq 'web' || $target eq 'tex') {
     if ($target eq 'web') {   $xlabel = &Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
  # This routine should never return anything.   $xlabel=&Apache::run::evaluate($xlabel,$safeeval,$$parstack[-1]);
    $xlabel =~ s/\n/ /g;
    if (length($xlabel) > $max_str_len) {
       $xlabel = substr($xlabel,0,$max_str_len);
    }
       } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_start($target,$token,'Plot Xlabel');
    my $text=&Apache::lonxml::get_all_text("/xlabel",$$parser[-1]);
    $result.=&Apache::edit::end_row().
       &Apache::edit::start_spanning_row().
       &Apache::edit::editline('',$text,'',60);
       } elsif ($target eq 'modified') {
    my $text=$$parser[-1]->get_text("/xlabel");
    $result.=&Apache::edit::rebuild_tag($token);
    $result.=&Apache::edit::modifiedfield($token);
     }      }
     return $result;      return $result;
 }  }
Line 238  sub start_xlabel { Line 656  sub start_xlabel {
 sub end_xlabel {  sub end_xlabel {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';      my $result = '';
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.      } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_end($target,$token);
     }      }
     return $result;      return $result;
 }  }
   
 ##------------------------------------------------------------------- ylabel  ##------------------------------------------------------------------- ylabel
 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",$$parser[-1]);      if ($target eq 'web' || $target eq 'tex') {
     if ($target eq 'web') {   $ylabel = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
  # This routine should never return anything.   $ylabel = &Apache::run::evaluate($ylabel,$safeeval,$$parstack[-1]);
    $ylabel =~ s/\n/ /g;
    if (length($ylabel) > $max_str_len) {
       $ylabel = substr($ylabel,0,$max_str_len);
    }
       } elsif ($target eq 'edit') {
    $result .= &Apache::edit::tag_start($target,$token,'Plot Ylabel');
    my $text = &Apache::lonxml::get_all_text("/ylabel",$$parser[-1]);
    $result .= &Apache::edit::end_row().
       &Apache::edit::start_spanning_row().
       &Apache::edit::editline('',$text,'',60);
       } elsif ($target eq 'modified') {
    my $text=$$parser[-1]->get_text("/ylabel");
    $result.=&Apache::edit::rebuild_tag($token);
    $result.=&Apache::edit::modifiedfield($token);
     }      }
     return $result;      return $result;
 }  }
Line 257  sub start_ylabel { Line 691  sub start_ylabel {
 sub end_ylabel {  sub end_ylabel {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';      my $result = '';
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.      } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_end($target,$token);
     }      }
     return $result;      return $result;
 }  }
   
 ##------------------------------------------------------------------- label  ##------------------------------------------------------------------- label
 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 $result='';
     my %label;      if ($target eq 'web' || $target eq 'tex') {
     &get_attributes(\%label,\%label_defaults,$parstack,$safeeval,   my %label;
    &get_attributes(\%label,\%label_defaults,$parstack,$safeeval,
     $tagstack->[-1]);      $tagstack->[-1]);
     $label{'text'} = &Apache::lonxml::get_all_text("/label",$$parser[-1]);   my $text = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
     if (! &$words_test($label{'text'})) {   $text = &Apache::run::evaluate($text,$safeeval,$$parstack[-1]);
  # I should probably warn about it, too.   $text =~ s/\n/ /g;
  $label{'text'} = 'Illegal text';   $text = substr($text,0,$max_str_len) if (length($text) > $max_str_len);
     }   $label{'text'} = $text;
     push(@labels,\%label);   push(@labels,\%label);
     if ($target eq 'web') {      } elsif ($target eq 'edit') {
  # This routine should never return anything.   $result .= &Apache::edit::tag_start($target,$token,'Plot Label');
    $result .= &edit_attributes($target,$token,\%label_defaults);
    my $text = &Apache::lonxml::get_all_text("/label",$$parser[-1]);
    $result .= &Apache::edit::end_row().
       &Apache::edit::start_spanning_row().
       &Apache::edit::editline('',$text,'',60);
       } elsif ($target eq 'modified') {
    &Apache::edit::get_new_args
       ($token,$parstack,$safeeval,keys(%label_defaults));
    $result.=&Apache::edit::rebuild_tag($token);
    my $text=$$parser[-1]->get_text("/label");
    $result.=&Apache::edit::modifiedfield($token);
     }      }
     return $result;      return $result;
 }  }
Line 284  sub start_label { Line 732  sub start_label {
 sub end_label {  sub end_label {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';      my $result = '';
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.      } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_end($target,$token);
     }      }
     return $result;      return $result;
 }  }
Line 294  sub end_label { Line 743  sub end_label {
 sub start_curve {  sub start_curve {
     my ($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,  
     $tagstack->[-1]);  
     push (@curves,\%curve);  
     &Apache::lonxml::register('Apache::lonplot',('function','data'));      &Apache::lonxml::register('Apache::lonplot',('function','data'));
     push (@Apache::lonxml::namespace,'curve');      push (@Apache::lonxml::namespace,'curve');
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.   my %curve;
    &get_attributes(\%curve,\%curve_defaults,$parstack,$safeeval,
       $tagstack->[-1]);
    push (@curves,\%curve);
       } elsif ($target eq 'edit') {
    $result .= &Apache::edit::tag_start($target,$token,'Curve');
    $result .= &help_win($curve_help_text);
    $result .= &edit_attributes($target,$token,\%curve_defaults,
                                       \@curve_edit_order);
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args
       ($token,$parstack,$safeeval,keys(%curve_defaults));
    if ($constructtag) {
       $result = &Apache::edit::rebuild_tag($token);
       $result.= &Apache::edit::handle_insert();
    }
     }      }
     return $result;      return $result;
 }  }
Line 311  sub end_curve { Line 771  sub end_curve {
     my $result = '';      my $result = '';
     pop @Apache::lonxml::namespace;      pop @Apache::lonxml::namespace;
     &Apache::lonxml::deregister('Apache::lonplot',('function','data'));      &Apache::lonxml::deregister('Apache::lonplot',('function','data'));
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.      } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_end($target,$token);
     }      }
     return $result;      return $result;
 }  }
   
 ##------------------------------------------------------------ curve function  ##------------------------------------------------------------ curve function
 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'})) {      if ($target eq 'web' || $target eq 'tex') {
  &Apache::lonxml::warning('Use of <function> precludes use of <data>.  The <data> will be omitted in favor of the <function> declaration.');   if (exists($curves[-1]->{'data'})) {
  delete $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",$$parser[-1]);          my $function = &Apache::lonxml::get_all_text("/function",$$parser[-1]);
     if ($target eq 'web') {   $function = &Apache::run::evaluate($function,$safeeval,$$parstack[-1]);
  # This routine should never return anything.   $curves[-1]->{'function'} = $function; 
       } elsif ($target eq 'edit') {
    $result .= &Apache::edit::tag_start($target,$token,'Gnuplot compatible curve function');
    my $text = &Apache::lonxml::get_all_text("/function",$$parser[-1]);
    $result .= &Apache::edit::end_row().
       &Apache::edit::start_spanning_row().
       &Apache::edit::editline('',$text,'',60);
       } elsif ($target eq 'modified') {
    $result.=&Apache::edit::rebuild_tag($token);
    my $text=$$parser[-1]->get_text("/function");
    $result.=&Apache::edit::modifiedfield($token);
     }      }
     return $result;      return $result;
 }  }
Line 335  sub start_function { Line 807  sub start_function {
 sub end_function {  sub end_function {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';      my $result = '';
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.      } elsif ($target eq 'edit') {
    $result .= &Apache::edit::end_table();
     }      }
     return $result;      return $result;
 }  }
   
 ##------------------------------------------------------------ curve  data  ##------------------------------------------------------------ curve  data
 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'})) {      if ($target eq 'web' || $target eq 'tex') {
  &Apache::lonxml::warning('Use of <data> precludes use of <function>.'.   if (exists($curves[-1]->{'function'})) {
             '  The <function> will be omitted in favor of the <data>'.      &Apache::lonxml::warning('Use of <data> precludes use of .'.
             ' declaration.');      '<function>.  The <function> will be omitted in favor of '.
  delete($curves[-1]->{'function'});              'the <data> declaration.');
     }      delete($curves[-1]->{'function'});
     my $datatext = &Apache::lonxml::get_all_text("/data",$$parser[-1]);   }
     $datatext =~ s/\s+//g;  # No whitespace, numbers must be seperated   my $datatext = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
                             # by commas   $datatext=&Apache::run::evaluate($datatext,$safeeval,$$parstack[-1]);
     if ($datatext !~ /^(([+-]?\d*\.?\d*)[, ]?)+$/) {   # Deal with cases where we're given an array...
  &Apache::lonxml::warning('Malformed data: '.$datatext);   if ($datatext =~ /^\@/) {
  $datatext = '';      $datatext = &Apache::run::run('return "'.$datatext.'"',
     }    $safeeval,1);
     # Need to do some error checking on the @data array -    }
     # make sure it's all numbers and make sure each array    $datatext =~ s/\s+/ /g;
     # is of the same length.   # Need to do some error checking on the @data array - 
     my @data = split /,/,$datatext;   # make sure it's all numbers and make sure each array 
     for (my $i=0;$i<=$#data;$i++) {   # is of the same length.
  # Check that it's non-empty   my @data;
  # Check that it's a number   if ($datatext =~ /,/) { # comma deliminated
  # Maybe I need a 'debug=on' switch to list the data set      @data = split /,/,$datatext;
  #    out in a warning?   } else { # Assume it's space seperated.
     }      @data = split / /,$datatext;
     push  @{$curves[-1]->{'data'}},\@data;   }
     if ($target eq 'web') {   for (my $i=0;$i<=$#data;$i++) {
  # This routine should never return anything.      # 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;
       }
    }
    # complain if the number of data points is not the same as
    # in previous sets of data.
    if (($curves[-1]->{'data'}) && ($#data != $#{@{$curves[-1]->{'data'}->[0]}})){
       &Apache::lonxml::warning
    ('Number of data points is not consistent with previous '.
    'number of data points');
    }
    push  @{$curves[-1]->{'data'}},\@data;
       } elsif ($target eq 'edit') {
    $result .= &Apache::edit::tag_start($target,$token,'Comma or space deliminated curve data');
    my $text = &Apache::lonxml::get_all_text("/data",$$parser[-1]);
    $result .= &Apache::edit::end_row().
       &Apache::edit::start_spanning_row().
       &Apache::edit::editline('',$text,'',60);
       } elsif ($target eq 'modified') {
    $result.=&Apache::edit::rebuild_tag($token);
    my $text=$$parser[-1]->get_text("/data");
    $result.=&Apache::edit::modifiedfield($token);
     }      }
     return $result;      return $result;
 }  }
Line 377  sub start_data { Line 883  sub start_data {
 sub end_data {  sub end_data {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';      my $result = '';
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.      } elsif ($target eq 'edit') {
    $result .= &Apache::edit::end_table();
     }      }
     return $result;      return $result;
 }  }
Line 387  sub end_data { Line 894  sub end_data {
 sub start_axis {  sub start_axis {
     my ($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,$safeeval,      if ($target eq 'web' || $target eq 'tex') {
     $tagstack->[-1]);   &get_attributes(\%axis,\%axis_defaults,$parstack,$safeeval,
     if ($target eq 'web') {   $tagstack->[-1]);
  # This routine should never return anything.      } elsif ($target eq 'edit') {
    $result .= &Apache::edit::tag_start($target,$token,'Plot Axes');
    $result .= &edit_attributes($target,$token,\%axis_defaults);
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args
       ($token,$parstack,$safeeval,keys(%axis_defaults));
    if ($constructtag) {
       $result = &Apache::edit::rebuild_tag($token);
    }
     }      }
     return $result;      return $result;
 }  }
Line 398  sub start_axis { Line 913  sub start_axis {
 sub end_axis {  sub end_axis {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
     my $result = '';      my $result = '';
     if ($target eq 'web') {      if ($target eq 'web' || $target eq 'tex') {
  # This routine should never return anything.      } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_end($target,$token);
       } elsif ($target eq 'modified') {
     }      }
     return $result;      return $result;
 }  }
   
   ###################################################################
   ##                                                               ##
   ##        Utility Functions                                      ##
   ##                                                               ##
   ###################################################################
   
 ##----------------------------------------------------------- set_defaults  ##----------------------------------------------------------- set_defaults
 sub set_defaults {  sub set_defaults {
     my $var      = shift;      my ($var,$defaults) = @_;
     my $defaults = shift;  
     my $key;      my $key;
     foreach $key (keys %$defaults) {      foreach $key (keys(%$defaults)) {
  $var->{$key} = $defaults->{$key}->{'default'};   $var->{$key} = $defaults->{$key}->{'default'};
     }      }
 }  }
   
 ##------------------------------------------------------------------- misc  ##------------------------------------------------------------------- misc
 sub get_attributes{  sub get_attributes{
     my $values   = shift;      my ($values,$defaults,$parstack,$safeeval,$tag) = @_;
     my $defaults = shift;      foreach my $attr (keys(%{$defaults})) {
     my $parstack = shift;  
     my $safeeval = shift;  
     my $tag      = shift;  
     my $attr;  
     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 440  sub get_attributes{ Line 957  sub get_attributes{
     return ;      return ;
 }  }
   
   ##------------------------------------------------------- write_gnuplot_file
 sub write_gnuplot_file {  sub write_gnuplot_file {
       my ($tmpdir,$filename,$target)= @_;
     my $gnuplot_input = '';      my $gnuplot_input = '';
     my $curve;      my $curve;
     # Collect all the colors      # Collect all the colors
Line 448  sub write_gnuplot_file { Line 967  sub write_gnuplot_file {
     push @Colors, $plot{'bgcolor'};      push @Colors, $plot{'bgcolor'};
     push @Colors, $plot{'fgcolor'};       push @Colors, $plot{'fgcolor'}; 
     push @Colors, (defined($axis{'color'})?$axis{'color'}:$plot{'fgcolor'});      push @Colors, (defined($axis{'color'})?$axis{'color'}:$plot{'fgcolor'});
     push @Colors, $Colors[-1];  # Redundancy  
     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
     $gnuplot_input .= 'set term gif ';      if ($target eq 'web') {
     $gnuplot_input .= 'transparent ' if ($plot{'transparent'} eq 'on');   $gnuplot_input .= 'set term gif ';
     $gnuplot_input .= $plot{'font'} . ' ';   $gnuplot_input .= 'transparent ' if ($plot{'transparent'} eq 'on');
     $gnuplot_input .= 'size '.$plot{'width'}.','.$plot{'height'}.' ';   $gnuplot_input .= $plot{'font'} . ' ';
     $gnuplot_input .= "@Colors\n";   $gnuplot_input .= 'size '.$plot{'width'}.','.$plot{'height'}.' ';
    $gnuplot_input .= "@Colors\n";
    # set output
    $gnuplot_input .= "set output\n";
       } elsif ($target eq 'tex') {
    $gnuplot_input .= "set term postscript eps monochrome\n";
    $gnuplot_input .= "set output \"$filename.eps\"\n";
       }
     # grid      # grid
     $gnuplot_input .= 'set grid'.$/ if ($plot{'grid'} eq 'on');      $gnuplot_input .= 'set grid'.$/ if ($plot{'grid'} eq 'on');
     # border      # border
     $gnuplot_input .= ($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";      # titles
     $gnuplot_input .= "set title  \"$title\"\n"  if (defined($title)) ;      $gnuplot_input .= "set title  \"$title\"\n"  if (defined($title)) ;
     $gnuplot_input .= "set xlabel \"$xlabel\"\n" if (defined($xlabel));      $gnuplot_input .= "set xlabel \"$xlabel\"\n" if (defined($xlabel));
     $gnuplot_input .= "set ylabel \"$ylabel\"\n" if (defined($ylabel));      $gnuplot_input .= "set ylabel \"$ylabel\"\n" if (defined($ylabel));
     if (defined(%axis)) {      # tics
       if (%xtics) {    
    $gnuplot_input .= "set xtics $xtics{'location'} ";
    $gnuplot_input .= ( $xtics{'mirror'} eq 'on'?"mirror ":"nomirror ");
    $gnuplot_input .= "$xtics{'start'}, ";
    $gnuplot_input .= "$xtics{'increment'}, ";
    $gnuplot_input .= "$xtics{'end'}\n";
       }
       if (%ytics) {    
    $gnuplot_input .= "set ytics $ytics{'location'} ";
    $gnuplot_input .= ( $ytics{'mirror'} eq 'on'?"mirror ":"nomirror ");
    $gnuplot_input .= "$ytics{'start'}, ";
    $gnuplot_input .= "$ytics{'increment'}, ";
           $gnuplot_input .= "$ytics{'end'}\n";
       }
       # axis
       if (%axis) {
  $gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";   $gnuplot_input .= "set xrange \[$axis{'xmin'}:$axis{'xmax'}\]\n";
  $gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";   $gnuplot_input .= "set yrange \[$axis{'ymin'}:$axis{'ymax'}\]\n";
     }      }
     # Key      # Key
     if (defined(%key)) {      if (%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'}.'" ';
  }    } 
  $gnuplot_input .= ($key{'box'} eq 'on' ? 'box ' : 'nobox ').$/;   $gnuplot_input .= ($key{'box'} eq 'on' ? 'box ' : 'nobox ').$/;
     } else {      } else {
Line 492  sub write_gnuplot_file { Line 1033  sub write_gnuplot_file {
     }      }
     # curves      # curves
     $gnuplot_input .= 'plot ';      $gnuplot_input .= 'plot ';
     my $datatext = '';  
     for (my $i = 0;$i<=$#curves;$i++) {      for (my $i = 0;$i<=$#curves;$i++) {
  $curve = $curves[$i];   $curve = $curves[$i];
  $gnuplot_input.= ', ' if ($i > 0);   $gnuplot_input.= ', ' if ($i > 0);
Line 501  sub write_gnuplot_file { Line 1041  sub write_gnuplot_file {
  $curve->{'function'}.' title "'.   $curve->{'function'}.' title "'.
  $curve->{'name'}.'" with '.   $curve->{'name'}.'" with '.
  $curve->{'linestyle'};   $curve->{'linestyle'};
   #
   # gnuplot's term=gif driver does not handle linewidths :(
   # . ' linewidth '. $curve->{'linewidth'};
   #
               if (($curve->{'linestyle'} eq 'points')      ||
                   ($curve->{'linestyle'} eq 'linespoints') ||
                   ($curve->{'linestyle'} eq 'errorbars')   ||
                   ($curve->{'linestyle'} eq 'xerrorbars')  ||
                   ($curve->{'linestyle'} eq 'yerrorbars')  ||
                   ($curve->{'linestyle'} eq 'xyerrorbars')) {
                   $gnuplot_input.=' pointtype '.$curve->{'pointtype'};
                   $gnuplot_input.=' pointsize '.$curve->{'pointsize'};
               }
  } elsif (exists($curve->{'data'})) {   } elsif (exists($curve->{'data'})) {
     $gnuplot_input.= '\'-\' title "'.      # Store data values in $datatext
  $curve->{'name'}.'" with '.      my $datatext = '';
  $curve->{'linestyle'};      #   get new filename
       my $datafilename = "$tmpdir/$filename.$i";
       my $fh=Apache::File->new(">$datafilename");
       # Compile data
     my @Data = @{$curve->{'data'}};      my @Data = @{$curve->{'data'}};
     my @Data0 = @{$Data[0]};      my @Data0 = @{$Data[0]};
     for (my $i =0; $i<=$#Data0; $i++) {      for (my $i =0; $i<=$#Data0; $i++) {
Line 514  sub write_gnuplot_file { Line 1070  sub write_gnuplot_file {
  }   }
  $datatext .= $/;   $datatext .= $/;
     }      }
     $datatext .=$/;      #   write file
       print $fh $datatext;
       close ($fh);
       #   generate gnuplot text
       $gnuplot_input.= '"'.$datafilename.'" title "'.
    $curve->{'name'}.'" with '.
    $curve->{'linestyle'};
               if (($curve->{'linestyle'} eq 'points')      ||
                   ($curve->{'linestyle'} eq 'linespoints') ||
                   ($curve->{'linestyle'} eq 'errorbars')   ||
                   ($curve->{'linestyle'} eq 'xerrorbars')  ||
                   ($curve->{'linestyle'} eq 'yerrorbars')  ||
                   ($curve->{'linestyle'} eq 'xyerrorbars')) {
                   $gnuplot_input.=' pointtype '.$curve->{'pointtype'};
                   $gnuplot_input.=' pointsize '.$curve->{'pointsize'};
               }
  }   }
     }      }
     $gnuplot_input .= $/.$datatext;      # Write the output to a file.
     return $gnuplot_input;      my $fh=Apache::File->new(">$tmpdir$filename");
       print $fh $gnuplot_input;
       close($fh);
       # That's all folks.
       return ;
 }  }
   
 1;  #---------------------------------------------- check_inputs
 __END__  sub check_inputs {
       ## Note: no inputs, no outputs - this acts only on global variables.
       ## Make sure we have all the input we need:
       if (! %plot) { &set_defaults(\%plot,\%gnuplot_defaults); }
       if (! %key ) {} # No key for this plot, thats okay
   #    if (! %axis) { &set_defaults(\%axis,\%axis_defaults); }
       if (! defined($title )) {} # No title for this plot, thats okay
       if (! defined($xlabel)) {} # No xlabel for this plot, thats okay
       if (! defined($ylabel)) {} # No ylabel for this plot, thats okay
       if ($#labels < 0) { }      # No labels for this plot, thats okay
       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 '';
    }
       }
   }
   
   #------------------------------------------------ make_edit
   sub edit_attributes {
       my ($target,$token,$defaults,$keys) = @_;
       my ($result,@keys);
       if ($keys && ref($keys) eq 'ARRAY') {
           @keys = @$keys;
       } else {
    @keys = sort(keys(%$defaults));
       }
       foreach my $attr (@keys) {
    # append a ' ' to the description if it doesn't have one already.
    my $description = $defaults->{$attr}->{'description'};
    $description .= ' ' if ($description !~ / $/);
    if ($defaults->{$attr}->{'edit_type'} eq 'entry') {
       $result .= &Apache::edit::text_arg
    ($description,$attr,$token,
    $defaults->{$attr}->{'size'});
    } elsif ($defaults->{$attr}->{'edit_type'} eq 'choice') {
       $result .= &Apache::edit::select_arg
    ($description,$attr,$defaults->{$attr}->{'choices'},$token);
    } elsif ($defaults->{$attr}->{'edit_type'} eq 'onoff') {
       $result .= &Apache::edit::select_arg
    ($description,$attr,['on','off'],$token);
    }
    $result .= '<br />';
       }
       return $result;
   }
   
   
   ###################################################################
   ##                                                               ##
   ##           Insertion functions for editing plots               ##
   ##                                                               ##
   ###################################################################
   
   sub insert_gnuplot {
       my $result = '';
       #  plot attributes
       $result .= "\n<gnuplot ";
       foreach my $attr (keys(%gnuplot_defaults)) {
    $result .= "\n     $attr=\"$gnuplot_defaults{$attr}->{'default'}\"";
       }
       $result .= ">";
       # Add the components (most are commented out for simplicity)
       # $result .= &insert_key();
       # $result .= &insert_axis();
       # $result .= &insert_title();    
       # $result .= &insert_xlabel();    
       # $result .= &insert_ylabel();    
       $result .= &insert_curve();
       # close up the <gnuplot>
       $result .= "\n</gnuplot>";
       return $result;
   }
   
   sub insert_tics {
       my $result;
       $result .= &insert_xtics() . &insert_ytics;
       return $result;
   }
   
   sub insert_xtics {
       my $result;
       $result .= "\n    <xtics ";
       foreach my $attr (keys(%tic_defaults)) {
    $result .= "\n        $attr=\"$tic_defaults{$attr}->{'default'}\" ";
       }
       $result .= "/>";
       return $result;
   }
   
   sub insert_ytics {
       my $result;
       $result .= "\n    <ytics ";
       foreach my $attr (keys(%tic_defaults)) {
    $result .= "\n        $attr=\"$tic_defaults{$attr}->{'default'}\" ";
       }
       $result .= "/>";
       return $result;
   }
   
   sub insert_key {
       my $result;
       $result .= "\n    <key ";
       foreach my $attr (keys(%key_defaults)) {
    $result .= "\n         $attr=\"$key_defaults{$attr}->{'default'}\"";
       }
       $result .= " />";
       return $result;
   }
   
   sub insert_axis{
       my $result;
       $result .= "\n    <axis ";
      foreach my $attr (keys(%axis_defaults)) {
    $result .= "\n         $attr=\"$axis_defaults{$attr}->{'default'}\"";
       }
       $result .= " />";
       return $result;
   }
   
   sub insert_title  { return "\n    <title></title>"; }
   sub insert_xlabel { return "\n    <xlabel></xlabel>"; }
   sub insert_ylabel { return "\n    <ylabel></ylabel>"; }
   
   sub insert_label {
       my $result;
       $result .= "\n    <label ";
       foreach my $attr (keys(%label_defaults)) {
    $result .= "\n         $attr=\"".
               $label_defaults{$attr}->{'default'}."\"";
       }
       $result .= "></label>";
       return $result;
   }
   
   sub insert_curve {
       my $result;
       $result .= "\n    <curve ";
       foreach my $attr (keys(%curve_defaults)) {
    $result .= "\n         $attr=\"".
       $curve_defaults{$attr}->{'default'}."\"";
       }
       $result .= " >";
       $result .= &insert_data().&insert_data()."\n    </curve>";
   }
   
   sub insert_function {
       my $result;
       $result .= "\n        <function></function>";
       return $result;
   }
   
   sub insert_data {
       my $result;
       $result .= "\n        <data></data>";
       return $result;
   }
   
   ##----------------------------------------------------------------------
   # Javascript functions to display help for tags
   
   sub make_javascript {
       my $helpwindowwidth  = 400;
       my $helpwindowheight = 400;
       my $result = '';
       $result.=<<"ENDFUNCTION";
   <script language="JavaScript">
   function openWin(text)
   {
     newWin = open("", "new_W", "width=$helpwindowwidth,height=$helpwindowheight,resizable=1,scrollbars=1");
     newWin.document.open("text/html", "replace");
     newWin.document.writeln(text);
     newWin.document.writeln('<center><a href=\"javascript:window.close()\">close this window</a></center>');
     newWin.document.close();
   }
   </script>
   ENDFUNCTION
       return $result;
   }
   
   sub help_win {
       my ($helptext)=@_;
       $helptext =~ s/\n/ /g;
       $helptext =~ s/\'/\\\'/g;
       my $result = '';
       $result.=<<"ENDWIN";
   <table width="100%"><tr><td align="right">
   <a href="javascript:openWin('$helptext')">help</a>
   </td></tr></table><hr />
   ENDWIN
       return $result;
   }
   ##----------------------------------------------------------------------
   1;
   __END__
   
   
Removed from v.1.13  
changed lines
  Added in v.1.63

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