This example demonstrates using a log scale axis versus a linear scale axis.
In ChartDirector, log scale axis can be configured using Axis.setLogScale, Axis.setLogScale2 or Axis.setLogScale3.
ChartDirector Ver 5.0 (Perl Edition)
Log Scale Axis
Source Code Listing
#!/usr/bin/perl
use perlchartdir;
sub createChart
{
my $img = shift;
# The data for the chart
my $data = [100, 125, 260, 147, 67];
my $labels = ["Mon", "Tue", "Wed", "Thu", "Fri"];
# Create a XYChart object of size 200 x 180 pixels
my $c = new XYChart(200, 180);
# Set the plot area at (30, 10) and of size 140 x 130 pixels
$c->setPlotArea(30, 10, 140, 130);
# Ise log scale axis if required
if ($img eq "1") {
$c->yAxis()->setLogScale3();
}
# Set the labels on the x axis
$c->xAxis()->setLabels($labels);
# Add a color bar layer using the given data. Use a 1 pixel 3D border for the
# bars.
$c->addBarLayer3($data)->setBorderColor(-1, 1);
# Output the chart
$c->makeChart("logaxis$img.png")
}
createChart(0);
createChart(1); |
#!/usr/bin/perl
# Include current script directory in the module path (needed on Microsoft IIS).
# This allows this script to work by copying ChartDirector to the same directory
# as the script (as an alternative to installation in Perl module directory)
use File::Basename;
use lib dirname($0) =~ /(.*)/;
use perlchartdir;
# Get HTTP query parameters
use CGI;
my $query = new CGI;
# The data for the chart
my $data = [100, 125, 260, 147, 67];
my $labels = ["Mon", "Tue", "Wed", "Thu", "Fri"];
# Create a XYChart object of size 200 x 180 pixels
my $c = new XYChart(200, 180);
# Set the plot area at (30, 10) and of size 140 x 130 pixels
$c->setPlotArea(30, 10, 140, 130);
# Ise log scale axis if required
if ($query->param("img") eq "1") {
$c->yAxis()->setLogScale3();
}
# Set the labels on the x axis
$c->xAxis()->setLabels($labels);
# Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars.
$c->addBarLayer3($data)->setBorderColor(-1, 1);
# Output the chart
binmode(STDOUT);
print "Content-type: image/png\n\n";
print $c->makeChart2($perlchartdir::PNG); |