Depth Area Chart

This example demonstrates using multiple area layers with semi-transparent colors to create a depth area chart.

ChartDirector allows an XYChart to containing multiple layers of the same or different types. In this example, all layers are 3D area layers. The areas are filled using semi-transparent colors to avoid the area on the front hiding the areas at the back.

[File: phpdemo/deptharea.php]

<?php
require_once("../lib/phpchartdir.php");

# The data for the area chart
$data0 = array(42, 49, 33, 38, 51, 46, 29, 41, 44, 57, 59, 52, 37, 34, 51, 56, 56,
    60, 70, 76, 63, 67, 75, 64, 51);
$data1 = array(50, 55, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58,
    59, 73, 77, 84, 82, 80, 84, 89);
$data2 = array(87, 89, 85, 66, 53, 39, 24, 21, 37, 56, 37, 22, 21, 33, 13, 17, 4, 23,
    16, 25, 9, 10, 5, 7, 6);
$labels = array("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 350 x 230 pixels
$c = new XYChart(350, 230);

# Set the plotarea at (50, 30) and of size 250 x 150 pixels.
$c->setPlotArea(50, 30, 250, 150);

# Add a legend box at (55, 0) (top of the chart) using 8 pts Arial Font. Set
# background and border to Transparent.
$legendObj = $c->addLegend(55, 0, false, "", 8);
$legendObj->setBackground(Transparent);

# Add a title to the x axis
$c->xAxis->setTitle("Network Load for Jun 12");

# Add a title to the y axis
$c->yAxis->setTitle("MBytes");

# Set the labels on the x axis.
$c->xAxis->setLabels($labels);

# Display 1 out of 2 labels on the x-axis. Show minor ticks for remaining labels.
$c->xAxis->setLabelStep(2, 1);

# Add three area layers, each representing one data set. The areas are drawn in
# semi-transparent colors.
$c->addAreaLayer($data2, 0x808080ff, "Server #1", 3);
$c->addAreaLayer($data0, 0x80ff0000, "Server #2", 3);
$c->addAreaLayer($data1, 0x8000ff00, "Server #3", 3);

# Output the chart
header("Content-type: image/png");
print($c->makeChart2(PNG));
?>