Bug #33938 for GDGraph: two axes line chart

Greetings, I encountered an issue while using the line chart with two axes. The problem is when the data set across a great range, especially when one set contains negative numbers, the chart cannot be drawn very nicely. One set will look okay, but most likely the other set will look like a straight line. The problem is it seems there is no way set a minimum value above 0 when one data set contains a negative number. The 0 will always be there and aligned between two axes. (see test_chart_1.png) Even manually setting the minimum value to above 0 does not work. Although this will result the chart looks a bit better, but the two data sets will be too apart. (see test_chart_2.png) #!/usr/bin/perl -w # Change above line to point to your perl binary use CGI ':standard'; use GD::Graph::lines; use strict; # Both the arrays should same number of entries. my @data = (['01', '02', '03', '04' ], [80, 90, 85, 75], [-6, -15, -25, 5]); my $mygraph = GD::Graph::lines->new(600, 300); $mygraph->set( #x_label => '', #y_label => '', title => 'Test Chart', # Draw datasets in 'solid', 'dashed' and 'dotted-dashed' lines line_types => [1, 2], # Set the thickness of line line_width => 2, # Set colors for datasets dclrs => ['blue', 'green'], two_axes => 1, #y1_min_value => 60, #y1_max_value => 100, #y2_min_value => -30, #y2_max_value => 10, ) or warn $mygraph->error; $mygraph->set_legend_font(GD::gdMediumBoldFont); $mygraph->set_legend('Data Set 1', 'Data Set 2'); my $myimage = $mygraph->plot(\@data) or die $mygraph->error; print "Content-type: image/png\n\n"; print $myimage->png; Thanks in advance for any help you can provide on the problem.