ChartDirector 5.1 (ColdFusion Edition)

Stacked Bar Chart




This example demonstrates creating a stacked bar chart, completed with bar labels and legend box.

The key features demonstrated in this example are:

For bar labels, Layer.setDataLabelStyle and Layer.setAggregateLabelStyle control the styles (fonts, colors, backgrounds, etc), while Layer.setDataLabelFormat and Layer.setAggregateLabelFormat control the formats (the contents of the label, number of decimal points in numbers, etc). You may also add custom labels to the bars using Layer.addCustomDataLabel and Layer.addCustomAggregateLabel and Layer.addCustomGroupLabel.

Source Code Listing

[File: cfdemo/stackedbar.cfm]
<cfscript>

// ChartDirector for ColdFusion API Access Point
cd = CreateObject("java", "ChartDirector.CFChart");

// A utility to allow us to create arrays with data in one line of code
function Array() {
    var result = ArrayNew(1);
    var i = 0;
    for (i = 1; i LTE ArrayLen(arguments); i = i + 1)
        result[i] = arguments[i];
    return result;
}

// The data for the bar chart
data0 = Array(100, 125, 245, 147, 67);
data1 = Array(85, 156, 179, 211, 123);
data2 = Array(97, 87, 56, 267, 157);

// The labels for the bar chart
labels = Array("Mon", "Tue", "Wed", "Thu", "Fri");

// Create a XYChart object of size 500 x 320 pixels
c = cd.XYChart(500, 320);

// Set the plotarea at (100, 40) and of size 280 x 240 pixels
c.setPlotArea(100, 40, 280, 240);

// Add a legend box at (400, 100)
c.addLegend(400, 100);

// Add a title to the chart using 14 points Times Bold Itatic font
c.addTitle("Weekday Network Load", "Times New Roman Bold Italic", 14);

// Add a title to the y axis. Draw the title upright (font angle = 0)
c.yAxis().setTitle("Average<*br*>Workload<*br*>(MBytes<*br*>Per Hour)").setFontAngle(
    0);

// Set the labels on the x axis
c.xAxis().setLabels(labels);

// Add a stacked bar layer and set the layer 3D depth to 8 pixels
layer = c.addBarLayer2(cd.Stack, 8);

// Add the three data sets to the bar layer
layer.addDataSet(data0, "0xff8080", "Server ## 1");
layer.addDataSet(data1, "0x80ff80", "Server ## 2");
layer.addDataSet(data2, "0x8080ff", "Server ## 3");

// Enable bar label for the whole bar
layer.setAggregateLabelStyle();

// Enable bar label for each segment of the stacked bar
layer.setDataLabelStyle();

// Output the chart
chart1URL = c.makeSession(GetPageContext(), "chart1");

// Include tool tip for the chart
imageMap1 = c.getHTMLImageMap("", "",
    "title='{dataSetName} on {xLabel}: {value} MBytes/hour'");

</cfscript>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Stacked Bar Chart
</div>
<hr style="border:solid 1px #000080" />
<cfoutput>
<div style="font-size:9pt; font-family:verdana; margin-bottom:1.5em">
    <a href='viewsource.cfm?file=#CGI.SCRIPT_NAME#'>View Source Code</a>
</div>
<img src="getchart.cfm?#chart1URL#" usemap="##map1" border="0" />
<map name="map1">#imageMap1#</map>
</cfoutput>
</body>
</html>