This example show demonstrates the dual independent y-axis feature of ChartDirector.
In ChartDirector, any data set can be binded to the primary y-axis or the secondary y-axis, controlled by
DataSet.setUseYAxis2. The default is the primary y-axis.
The y-axes in this example are of different colors. This is achieved using
Axis.setColors.
[File: perldemo/dualyaxis.pl] (The CGI version is available as "perldemo_cgi/dualyaxis.pl".)
#!/usr/bin/perl
use perlchartdir;
#The data for the chart
my $data0 = [0.05, 0.06, 0.48, 0.1, 0.01, 0.05];
my $data1 = [100, 125, 265, 147, 67, 105];
my $labels = ["Jan", "Feb", "Mar", "Apr", "May", "Jun"];
#Create a XYChart object of size 300 x 180 pixels
my $c = new XYChart(300, 180);
#Set the plot area at (50, 20) and of size 200 x 130 pixels
$c->setPlotArea(50, 20, 200, 130);
#Add a title to the chart using 8 pts Arial Bold font
$c->addTitle("Independent Y-Axis Demo", "arialbd.ttf", 8);
#Set the x axis labels using the given labels
$c->xAxis()->setLabels($labels);
#Add a title to the primary (left) y axis
$c->yAxis()->setTitle("Packet Drop Rate (pps)");
#Set the axis, label and title colors for the primary y axis to red (0xc00000)
#to match the first data set
$c->yAxis()->setColors(0xc00000, 0xc00000, 0xc00000);
#Add a title to the secondary (right) y axis
$c->yAxis2()->setTitle("Throughtput (MBytes)");
#set the axis, label and title colors for the primary y axis to green (0x008000)
#to match the second data set
$c->yAxis2()->setColors(0x8000, 0x8000, 0x8000);
#Add a line layer to for the first data set using red (0xc00000) color with a
#line width to 3 pixels
$c->addLineLayer($data0, 0xc00000)->setLineWidth(3);
#Add a bar layer to for the second data set using green (0x00C000) color. Bind
#the second data set to the secondary (right) y axis
$c->addBarLayer()->addDataSet($data1, 0xc000)->setUseYAxis2();
#output the chart
$c->makeChart("dualyaxis.png")
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