Rotated Area Chart

This example demonstrates swapping the x and y axes to produce an rotated area chart in which the area goes from left to right (instead of bottom to top).

The x and y axes in the example are configured as follows:

Initially, the x-axis is horizontal from left to right at the bottom of the plot area, while the y-axis is vertical from bottom to top at the left side of the plot area.
Swap the x and y axes using XYChart.swapXY. Now the x-axis is vertical from bottom to top at the left side of the chart, while the y-axis is horizontal from left to right at the bottom of the chart.
Use XYChart.setYAxisOnRight to move the y-axis to the opposite side of the plot area, so that the y-axis is at the top of the plot area. (Note: the "right" word on setYAxisOnRight means the "right" side before "swapXY" rotation. After rotation, the right side will become to top side.)
Use Axis.setReverse to reverse the direction of the x-axis, so that the x-axis is vertical from top to bottom (instead of from bottom to top).

The area in this chart is filled using a gradient color created with BaseChart.gradientColor.

perldemo\rotatedarea.pl

#!/usr/bin/perl

# The ChartDirector for Perl module is assumed to be in "../lib"
use File::Basename;
use lib (dirname($0)."/../lib") =~ /(.*)/;

use perlchartdir;

# The data for the area chart
my $data = [30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 89, 60, 55, 53, 35, 50, 66, 56, 48,
    52, 65, 62];

# The labels for the area chart
my $labels = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
    24];

# Create a XYChart object of size 320 x 320 pixels
my $c = new XYChart(320, 320);

# Swap the x and y axis to become a rotated chart
$c->swapXY();

# Set the y axis on the top side (right + rotated = top)
$c->setYAxisOnRight();

# Reverse the x axis so it is pointing downwards
$c->xAxis()->setReverse();

# Set the plotarea at (50, 50) and of size 200 x 200 pixels. Enable horizontal and vertical grids by
# setting their colors to grey (0xc0c0c0).
$c->setPlotArea(50, 50, 250, 250)->setGridColor(0xc0c0c0, 0xc0c0c0);

# Add a line chart layer using the given data
$c->addAreaLayer($data, $c->gradientColor(50, 0, 300, 0, 0xffffff, 0x0000ff));

# Set the labels on the x axis. Append "m" after the value to show the unit.
$c->xAxis()->setLabels2($labels, "{value} m");

# Display 1 out of 3 labels.
$c->xAxis()->setLabelStep(3);

# Add a title to the x axis
$c->xAxis()->setTitle("Depth");

# Add a title to the y axis
$c->yAxis()->setTitle("Carbon Dioxide Concentration (ppm)");

# Output the chart
$c->makeChart("rotatedarea.png");