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GD::GRAPH AND FRIENDS
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$chart->set( x_label => 'Month', y_label => '# sold', title => 'First three quarters, 2000', y_long_ticks => 1, markers => [1, 5], marker_size => 8, line_types => [4, 1], line_width => 3, ); $chart->set_legend('outlet 1', 'outlet 2');
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Sometimes, hopefully not often, you need to produce a chart that contains datasets in different formats. You might want to represent one data set with bars, and another one as a line or area; GD::Graph provides the mixed chart type for this.
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The Southern Oscillation Index (SOI) is a measure that expresses the difference in air pressure between Tahiti and Darwin and is commonly associated with El Ni o. When the SOI is strongly positive, there is a higher probability of rain in Eastern and Northern Australia, and when it is strongly negative there is less chance of rain.9 You will often see the SOI depicted as a line, and rainfall as bars. To present a graph that shows any relation between the two, it would be permissible to choose a mixed type, as shown in figure 5.4.
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Figure 5.4 The Southern Oscillation Index and the rainfall per month for Sydney, Australia from January 1997 to July 1999. The rainfall is shown as bars, and the SOI as a line. From this picture, one could tentatively draw a cautious conclusion that a negative SOI could be related to a decrease in rainfall.
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Of course, the real story is more complicated, and depends on not just the value of the SOI, but also on how persistently positive or negative it is, and on some other variables.
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Suppose we have a database with the daily SOI values and rainfall in Sydney from January 1987 to December 1999. From this data we create a summary file that contains the monthly average SOI and total amount of rain. This file could have the following format:
# Month/Year Jan/1987 Feb/1987 Mar/1987 Apr/1987 Rain 49.8 35.2 154.0 36.6 SOI -6.3 -12.6 -16.6 -24.4
# more lines like this... Oct/1999 Nov/1999 Dec/1999 149.4 9.1 13.1 13
with tab characters separating the values. We fill a GD::Graph::Data object with part of the data from this file (everything between a start and end date):
use strict; use GD::Graph::mixed; use DBI; my ($start, $end) = qw(Jan/1997 Jul/1999); my $data = GD::Graph::Data->new(); open(IN, 'SOI.data') or die "Can't read SOI.data:$!"; while(<IN>) { next if /^#/; if (/^\Q$start/ .. /^\Q$end/) { chomp; my @d = map {$_ eq '' undef : $_} split /\t/; $data->add_point(@d); } } close(IN);
Note that in this example the start and end dates have been hard coded, but in a real world program they would most likely come from user input. Once we have the data, a GD::Graph::mixed object is created and given a legend, so we can easily recognize which element in the resulting chart belongs to which data set.
my $chart = GD::Graph::mixed->new(700,500); $chart->set_legend('Rain (left)', 'SOI (right)'); $chart->set( y1_label => 'Monthly rain fall (mm)', y2_label => 'SOI', types => [qw(bars lines)], dclrs => [qw(blue green)], line_width => 5,
GD::GRAPH AND FRIENDS
two_axes y_long_ticks x_label_skip x_labels_vertical zero_axis transparent );
=> => => => => =>
1, 1, 3, 1, 1, 0,
The options for the chart are mostly self-explanatory, but I ll highlight a few: the option two_axes tells the chart object that the two data sets should be treated separately. The first one will have its values drawn on the left vertical axis, and the second on the right. This option is only valid when you have exactly two data sets. Because we have two Y axes, we can also label them separately, y1_label and y2_label. We set the y_long_ticks option to a true value for aesthetic reasons, and leave the x_ticks option at a false value to avoid vertical grid lines. It should also be noted that the line_width option only affects the width of the data lines, not of any of the axes. GD::Graph summary In this section we have seen how GD::Graph can be used to create a variety of charts, how it may be presented with the data you want plotted, and some specific examples. The module can do much more than has been shown here. The original distribution archive, available from CPAN, contains a set of examples, and the documentation is quite elaborate. More examples that use GD::Graph can be found in sections 6.3, CGI and dynamically generated graphics, on page 94 and 7.7, Animations with the Gimp, on page 134.
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