/usr/share/perl5/Chart/Points.pm is in libchart-perl 2.4.5-1.
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::Points
#
# 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 2012-03-22
# @version 2.4.5
#
## @class Chart::Points
# Points class derived from class Base.
#
# This class provides all functions which are specific to
# points
#
package Chart::Points;
use Chart::Base '2.4.5';
use GD;
use Carp;
use strict;
@Chart::Points::ISA = qw(Chart::Base);
$Chart::Points::VERSION = '2.4.5';
#>>>>>>>>>>>>>>>>>>>>>>>>>>#
# public methods go here #
#<<<<<<<<<<<<<<<<<<<<<<<<<<#
#>>>>>>>>>>>>>>>>>>>>>>>>>>>#
# private methods go here #
#<<<<<<<<<<<<<<<<<<<<<<<<<<<#
## @fn private _draw_data
# finally get around to plotting the data
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 );
my ( $width, $height, $delta, $map, $delta_num, $zero_offset );
my ( $i, $j, $color, $brush );
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 );
}
# draw the points
for $i ( 1 .. $self->{'num_datasets'} )
{
# get the color for this dataset, and set the brush
$color = $self->_color_role_to_index( 'dataset' . ( $i - 1 ) );
my $offset = 0;
( $brush, $offset ) = $self->_prepare_brush( $color, 'point', 'dataset' . ( $i - 1 ) );
$self->{'gd_obj'}->setBrush($brush);
# draw every point for this dataset
for $j ( 0 .. $self->{'num_datapoints'} )
{
# 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;
# 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 );
}
# store the imagemap data if they asked for it
if ( $self->true( $self->{'imagemap'} ) )
{
$self->{'imagemap_data'}->[$i][$j] = [ $x2, $y2 ];
}
}
}
}
# and finaly box it off
$self->{'gd_obj'}
->rectangle( $self->{'curr_x_min'}, $self->{'curr_y_min'}, $self->{'curr_x_max'}, $self->{'curr_y_max'}, $misccolor );
return;
}
## be a good module and return 1
1;
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