<?php
require_once("/usr/local/lib/php/20100525/phpchartdir.php");

# 4 data points to represent the cash flow for the Q1 - Q4
$data = array(230, 140, 220, 330, 150);

# We want to plot a waterfall chart showing the 4 quarters as well as the total
$labels = array("Product 1", "Product 2", "Product 3", "Product 4", "Product 5",
    "Total");

# The top side of the bars in a waterfall chart is the accumulated data. We use the
# ChartDirector ArrayMath utility to accumulate the data. The "total" is handled by
# inserting a zero point at the end before accumulation (after accumulation it will
# become the total).
$tmpArrayMath1 = new ArrayMath($data);
$tmpArrayMath1->insert2(0, 1);
$tmpArrayMath1->acc();
$boxTop = $tmpArrayMath1->result();

# The botom side of the bars is just the top side of the previous bar. So we shifted
# the top side data to obtain the bottom side data.
$tmpArrayMath1 = new ArrayMath($boxTop);
$tmpArrayMath1->shift(1, 0);
$boxBottom = $tmpArrayMath1->result();

# The last point (total) is different. Its bottom side is always 0.
$boxBottom[count($boxBottom) - 1] = 0;

# Create a XYChart object of size 500 x 280 pixels. Set background color to light
# blue (ccccff), with 1 pixel 3D border effect.
$c = new XYChart(500, 290, 0xccccff, 0x000000, 1);

# Add a title to the chart using 13 points Arial Bold Itatic font, with white
# (ffffff) text on a deep blue (0x80) background
$textBoxObj = $c->addTitle("Product Revenue - Year 2004", "arialbi.ttf", 13, 0xffffff
    );
$textBoxObj->setBackground(0x000080);

# Set the plotarea at (55, 50) and of size 430 x 215 pixels. Use alternative
# white/grey background.
$c->setPlotArea(55, 45, 430, 215, 0xffffff, 0xeeeeee);

# Set the labels on the x axis using Arial Bold font
$labelsObj = $c->xAxis->setLabels($labels);
$labelsObj->setFontStyle("arialbd.ttf");

# Set the x-axis ticks and grid lines to be between the bars
$c->xAxis->setTickOffset(0.5);

# Use Arial Bold as the y axis label font
$c->yAxis->setLabelStyle("arialbd.ttf");

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

# Add a multi-color box-whisker layer to represent the waterfall bars
$layer = $c->addBoxWhiskerLayer2($boxTop, $boxBottom);

# Put data labels on the bars to show the cash flow using Arial Bold font
$layer->setDataLabelFormat("{={top}-{bottom}}M");
$textBoxObj = $layer->setDataLabelStyle("arialbd.ttf");
$textBoxObj->setAlignment(Center);

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