Thanks.
This piece of code at your referred site was able to place the start of the plot at the origin but I am not sure how they did it.
use strict;
use GD::Graph::lines;
require 'save.pl';
use constant PI => 4 * atan2(1,1);
print STDERR "Processing sample55\n";
my @x = map {$_ * 3 * PI/100} (0 .. 100);
my @y = map sin, @x;
my @z = map cos, @x;
my @data = (\@x,\@y,\@z);
my $my_graph = new GD::Graph::lines();
$my_graph->set(
x_label => 'Angle (Radians)',
y_label => 'Trig Function Value',
x_tick_number => 'auto',
y_tick_number => 'auto',
title => 'Sine and Cosine',
line_width => 1,
x_label_position => 1/2,
r_margin => 15,
transparent => 0,
);
$my_graph->set_legend('Thanks to Scott Prahl');
$my_graph->plot(\@data);
save_chart($my_graph, 'sample55');
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