Pos/Neg Waterfall Chart

[File: phpdemo/posnegwaterfall.php]
<?php
require_once("../lib/phpchartdir.php");

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

# We want to plot a waterfall chart showing the 4 quarters as well as the total
$labels = array("1st Quarter", "2nd Quarter", "3rd Quarter", "4th Quarter", "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).
$boxTop = (new ArrayMath($data))->insert2(0, 1, count($data))->acc()->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.
$boxBottom = (new ArrayMath($boxTop))->shift(1, 0)->result();

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

# In this example, we want to use different colors depending on the data is positive or negative.
$posColor = 0x00ff00;
$negColor = 0xff0000;

# 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, 300, 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
$c->addTitle("Corporate Cash Flow - Year 2004", "Arial Bold Italic", 13, 0xffffff)->setBackground(
    0x000080);

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

# Add a legend box at (55, 25) using 8pt Arial Bold font with horizontal layout, with transparent
# background and border color.
$b = $c->addLegend(55, 25, false, "Arial Bold", 8);
$b->setBackground(Transparent, Transparent);

# Add keys to show the colors for positive and negative cash flows
$b->addKey("Positive Cash Flow", $posColor);
$b->addKey("Negative Cash Flow", $negColor);

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

# 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("Arial Bold");

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

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

# Color the bars depending on whether it is positive or negative
for($i = 0; $i < count($boxTop); ++$i) {
    if ($boxTop[$i] >= $boxBottom[$i]) {
        $layer->setBoxColor($i, $posColor);
    } else {
        $layer->setBoxColor($i, $negColor);
    }
}

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

# Output the chart
$viewer = new WebChartViewer("chart1");
$viewer->setChart($c, SVG);

# Include tool tip for the chart
$viewer->setImageMap($c->getHTMLImageMap("", "", "title='{xLabel}: {={top}-{bottom}} millions'"));
?>

<!DOCTYPE html>
<html>
<head>
    <title>Pos/Neg Waterfall Chart</title>
    <!-- Include ChartDirector Javascript Library to support chart interactions -->
    <script type="text/javascript" src="cdjcv.js"></script>
</head>
<body style="margin:5px 0px 0px 5px">
    <div style="font:bold 18pt verdana;">
        Pos/Neg Waterfall Chart
    </div>
    <hr style="border:solid 1px #000080; background:#000080" />
    <div style="font:10pt verdana; margin-bottom:1.5em">
        <a href="viewsource.php?file=<?=basename(__FILE__)?>">View Chart Source Code</a>
    </div>
    <!-- ****** Here is the chart image ****** -->
    <?php echo $viewer->renderHTML(); ?>
</body>
</html>