/usr/share/perl5/Chart/ErrorBars.pm is in libchart-perl 2.4.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Implementation of Chart::ErrorBars
#
# written by
# @author david bonner (dbonner@cs.bu.edu)
#
# maintained by the
# @author Chart Group at Geodetic Fundamental Station Wettzell (Chart@fs.wettzell.de)
# @date 2012-10-03
# @version 2.4.6
#
package Chart::ErrorBars;
use Chart::Base '2.4.6';
use GD;
use Carp;
use strict;
@Chart::ErrorBars::ISA = qw(Chart::Base);
$Chart::ErrorBars::VERSION = '2.4.6';
## @class Chart::ErrorBars
# ErrorBars class derived from class Base.
#
# This class provides all functions which are specific to
# pointes having carrying vertical bars which represent
# errors or standard deviations
#
#>>>>>>>>>>>>>>>>>>>>>>>>>>#
# public methods go here #
#<<<<<<<<<<<<<<<<<<<<<<<<<<#
#>>>>>>>>>>>>>>>>>>>>>>>>>>>#
# private methods go here #
#<<<<<<<<<<<<<<<<<<<<<<<<<<<#
## @fn private _draw_data
# finally get around to plotting the data
#
# Overwrites Base function
#
sub _draw_data
{
my $self = shift;
my $data = $self->{'dataref'};
my $misccolor = $self->_color_role_to_index('misc');
my ( $x1, $x2, $x3, $y1, $y2, $y3, $mod, $y_error_up, $y_error_down );
my ( $width, $height, $delta, $map, $delta_num, $zero_offset, $flag );
my ( $i, $j, $color, $brush );
my $dataset = 0;
my $diff;
# init the imagemap data field if they want it
if ( $self->true( $self->{'imagemap'} ) )
{
$self->{'imagemap_data'} = [];
}
# find the delta value between data points, as well
# as the mapping constant
$width = $self->{'curr_x_max'} - $self->{'curr_x_min'};
$height = $self->{'curr_y_max'} - $self->{'curr_y_min'};
$delta = $width / ( $self->{'num_datapoints'} > 0 ? $self->{'num_datapoints'} : 1 );
$diff = $self->{'max_val'} - $self->{'min_val'};
$diff = 1 if $diff == 0;
$map = $height / $diff;
# for a xy-plot, use this delta and maybe an offset for the zero-axes
if ( $self->true( $self->{'xy_plot'} ) )
{
$diff = $self->{'x_max_val'} - $self->{'x_min_val'};
$diff = 1 if $diff == 0;
$delta_num = $width / $diff;
if ( $self->{'x_min_val'} <= 0 && $self->{'x_max_val'} >= 0 )
{
$zero_offset = abs( $self->{'x_min_val'} ) * abs($delta_num);
}
elsif ( $self->{'x_min_val'} > 0 || $self->{'x_max_val'} < 0 )
{
$zero_offset = -$self->{'x_min_val'} * $delta_num;
}
else
{
$zero_offset = 0;
}
}
# get the base x-y values
if ( $self->false( $self->{'xy_plot'} ) )
{
$x1 = $self->{'curr_x_min'} + ( $delta / 2 );
}
else
{
$x1 = $self->{'curr_x_min'};
}
if ( $self->{'min_val'} >= 0 )
{
$y1 = $self->{'curr_y_max'};
$mod = $self->{'min_val'};
}
elsif ( $self->{'max_val'} <= 0 )
{
$y1 = $self->{'curr_y_min'};
$mod = $self->{'max_val'};
}
else
{
$y1 = $self->{'curr_y_min'} + ( $map * $self->{'max_val'} );
$mod = 0;
$self->{'gd_obj'}->line( $self->{'curr_x_min'}, $y1, $self->{'curr_x_max'}, $y1, $misccolor );
}
# first of all box it off
$self->{'gd_obj'}
->rectangle( $self->{'curr_x_min'}, $self->{'curr_y_min'}, $self->{'curr_x_max'}, $self->{'curr_y_max'}, $misccolor );
# draw the points
for $i ( 1 .. $self->{'num_datasets'} )
{
if ( $self->false( $self->{'same_error'} ) )
{
# get the color for this dataset, and set the brush
$color = $self->_color_role_to_index( 'dataset' . ($dataset) ); # draw every point for this dataset
$dataset++ if ( ( $i - 1 ) % 3 == 0 );
for $j ( 0 .. $self->{'num_datapoints'} )
{
#get the brush for points
$brush = $self->_prepare_brush( $color, 'point' );
$self->{'gd_obj'}->setBrush($brush);
# only draw if the current set is really a dataset and no errorset
if ( ( $i - 1 ) % 3 == 0 )
{
# don't try to draw anything if there's no data
if ( defined( $data->[$i][$j] ) )
{
if ( $self->true( $self->{'xy_plot'} ) )
{
$x2 = $x1 + $delta_num * $data->[0][$j] + $zero_offset + 1;
$x3 = $x2;
}
else
{
$x2 = $x1 + ( $delta * $j ) + 1;
$x3 = $x2;
}
$y2 = $y1 - ( ( $data->[$i][$j] - $mod ) * $map );
$y3 = $y2;
$y_error_up = $y2 - abs( $data->[ $i + 1 ][$j] ) * $map;
$y_error_down = $y2 + abs( $data->[ $i + 2 ][$j] ) * $map;
# draw the point only if it is within the chart borders
if ( $data->[$i][$j] <= $self->{'max_val'}
&& $data->[$i][$j] >= $self->{'min_val'} )
{
$self->{'gd_obj'}->line( $x2, $y2, $x3, $y3, gdBrushed );
$flag = 'true';
}
#reset the brush for lines
$brush = $self->_prepare_brush( $color, 'line' );
$self->{'gd_obj'}->setBrush($brush);
#draw the error bars
if ( $self->true($flag) )
{
# the upper lines
$self->{'gd_obj'}->line( $x2, $y2, $x3, $y_error_up, gdBrushed );
$self->{'gd_obj'}->line( $x2 - 3, $y_error_up, $x3 + 3, $y_error_up, gdBrushed );
# the down lines
$self->{'gd_obj'}->line( $x2, $y2, $x3, $y_error_down, gdBrushed );
$self->{'gd_obj'}->line( $x2 - 3, $y_error_down, $x3 + 3, $y_error_down, gdBrushed );
$flag = 'false';
}
# store the imagemap data if they asked for it
if ( $self->true( $self->{'imagemap'} ) )
{
$self->{'imagemap_data'}->[$i][$j] = [ $x2, $y2 ];
}
}
}
}
}
else
{
# get the color for this dataset, and set the brush
$color = $self->_color_role_to_index( 'dataset' . ($dataset) ); # draw every point for this dataset
$dataset++ if ( ( $i - 1 ) % 2 == 0 );
for $j ( 0 .. $self->{'num_datapoints'} )
{
#get the brush for points
$brush = $self->_prepare_brush( $color, 'point' );
$self->{'gd_obj'}->setBrush($brush);
# only draw if the current set is really a dataset and no errorset
if ( ( $i - 1 ) % 2 == 0 )
{
# don't try to draw anything if there's no data
if ( defined( $data->[$i][$j] ) )
{
if ( $self->true( $self->{'xy_plot'} ) )
{
$x2 = $x1 + $delta_num * $data->[0][$j] + $zero_offset;
$x3 = $x2;
}
else
{
$x2 = $x1 + ( $delta * $j );
$x3 = $x2;
}
$y2 = $y1 - ( ( $data->[$i][$j] - $mod ) * $map );
$y3 = $y2;
$y_error_up = $y2 - abs( $data->[ $i + 1 ][$j] ) * $map;
$y_error_down = $y2 + abs( $data->[ $i + 1 ][$j] ) * $map;
# draw the point only if it is within the chart borders
if ( $data->[$i][$j] <= $self->{'max_val'}
&& $data->[$i][$j] >= $self->{'min_val'} )
{
$self->{'gd_obj'}->line( $x2, $y2, $x3, $y3, gdBrushed );
$flag = 'true';
}
#reset the brush for lines
$brush = $self->_prepare_brush( $color, 'line' );
$self->{'gd_obj'}->setBrush($brush);
#draw the error bars
if ( $self->true($flag) )
{
# the upper lines
$self->{'gd_obj'}->line( $x2, $y2, $x3, $y_error_up, gdBrushed );
$self->{'gd_obj'}->line( $x2 - 3, $y_error_up, $x3 + 3, $y_error_up, gdBrushed );
# the down lines
$self->{'gd_obj'}->line( $x2, $y2, $x3, $y_error_down, gdBrushed );
$self->{'gd_obj'}->line( $x2 - 3, $y_error_down, $x3 + 3, $y_error_down, gdBrushed );
$flag = 'false';
}
# store the imagemap data if they asked for it
if ( $self->true( $self->{'imagemap'} ) )
{
$self->{'imagemap_data'}->[$i][$j] = [ $x2, $y2 ];
}
}
} #end for
}
}
}
return 1;
}
## @fn private _prepare_brush
# set the gdBrush object to trick GD into drawing fat lines
#
# Overwrite Base function
#
sub _prepare_brush
{
my $self = shift;
my $color = shift;
my $type = shift;
my ( $radius, @rgb, $brush, $white, $newcolor );
# get the rgb values for the desired color
@rgb = $self->{'gd_obj'}->rgb($color);
# get the appropriate brush size
if ( $type eq 'line' )
{
$radius = $self->{'brush_size'} / 2;
}
elsif ( $type eq 'point' )
{
$radius = $self->{'pt_size'} / 2;
}
# create the new image
$brush = GD::Image->new( $radius * 2, $radius * 2 );
# get the colors, make the background transparent
$white = $brush->colorAllocate( 255, 255, 255 );
$newcolor = $brush->colorAllocate(@rgb);
$brush->transparent($white);
# draw the circle
$brush->arc( $radius - 1, $radius - 1, $radius, $radius, 0, 360, $newcolor );
# fill it if we're using lines
$brush->fill( $radius - 1, $radius - 1, $newcolor );
# set the new image as the main object's brush
return $brush;
}
## @fn private int _draw_legend()
# let them know what all the pretty colors mean
# @return status
## let them know what all the pretty colors mean
sub _draw_legend
{
my $self = shift;
my ( $length, $step, $temp, $post_length );
my $j = 0;
# check to see if legend type is none..
if ( $self->{'legend'} =~ /^none$/ )
{
return 1;
}
#just for later checking and warning
if ( $#{ $self->{'legend_labels'} } >= 0 )
{
$post_length = scalar( @{ $self->{'legend_labels'} } );
}
#look if every second or eyery third dataset is a set for data
if ( $self->false( $self->{'same_error'} ) )
{
$step = 3;
}
else
{
$step = 2;
}
# init a field to store the length of the longest legend label
unless ( $self->{'max_legend_label'} )
{
$self->{'max_legend_label'} = 0;
}
# fill in the legend labels, find the longest one
for ( my $i = 1 ; $i < $self->{'num_datasets'} ; $i += $step )
{
my $label = $j + 1;
unless ( $self->{'legend_labels'}[$j] )
{
$self->{'legend_labels'}[$j] = "Dataset $label";
}
$length = length( $self->{'legend_labels'}[$j] );
if ( $length > $self->{'max_legend_label'} )
{
$self->{'max_legend_label'} = $length;
}
$j++;
}
#we just have to label the datasets in the legend
#we'll reset it, to draw the sets
$temp = $self->{'num_datasets'};
$self->{'num_datasets'} = $j;
# check to see if they have as many labels as datasets,
# warn them if not
if ( ( $post_length > 0 ) && ( $post_length != $j ) )
{
carp "The number of legend labels and datasets doesn\'t match";
}
# different legend types
if ( $self->{'legend'} eq 'bottom' )
{
$self->_draw_bottom_legend;
}
elsif ( $self->{'legend'} eq 'right' )
{
$self->_draw_right_legend;
}
elsif ( $self->{'legend'} eq 'left' )
{
$self->_draw_left_legend;
}
elsif ( $self->{'legend'} eq 'top' )
{
$self->_draw_top_legend;
}
else
{
carp "I can't put a legend there (at " . $self->{'legend'} . ")\n";
}
#reset the number of dataset to make sure that everything goes right
$self->{'num_datasets'} = $temp;
# and return
return 1;
}
#find the range of the x scale, don't forget the errors!
sub _find_y_range
{
my $self = shift;
my $data = $self->{'dataref'};
my $max = undef;
my $min = undef;
if ( $self->false( $self->{'same_error'} ) )
{
for my $i ( 1 .. $self->{'num_datasets'} )
{
if ( ( $i - 1 ) % 3 == 0 )
{
for my $j ( 0 .. $self->{'num_datapoints'} )
{
if ( defined( $data->[$i][$j] ) && defined( $data->[ $i + 1 ][$j] ) && defined( $data->[ $i + 2 ][$j] ) )
{
if ( defined $max )
{
if ( ( $data->[$i][$j] + abs( $data->[ $i + 1 ][$j] ) ) > $max )
{
$max = $data->[$i][$j] + abs( $data->[ $i + 1 ][$j] );
}
if ( ( $data->[$i][$j] - abs( $data->[ $i + 2 ][$j] ) ) < $min )
{
$min = $data->[$i][$j] - abs( $data->[ $i + 2 ][$j] );
}
}
else { $min = $max = $data->[$i][$j]; }
}
}
}
}
return ( $min, $max );
}
else
{
for my $i ( 1 .. $self->{'num_datasets'} )
{
if ( ( $i - 1 ) % 2 == 0 )
{
for my $j ( 0 .. $self->{'num_datapoints'} )
{
if ( defined( $data->[$i][$j] ) && defined( $data->[ $i + 1 ][$j] ) )
{
if ( defined $max )
{
if ( ( $data->[$i][$j] + $data->[ $i + 1 ][$j] ) > $max )
{
$max = $data->[$i][$j] + $data->[ $i + 1 ][$j];
}
if ( ( $data->[$i][$j] - $data->[ $i + 1 ][$j] ) < $min )
{
$min = $data->[$i][$j] - $data->[ $i + 1 ][$j];
}
}
else { $min = $max = $data->[$i][$j]; }
}
}
}
}
return ( $min, $max );
}
}
## be a good module and return 1
1;
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