ChartDirector Ver 4.1 (ColdFusion Edition)

Percentage Bar Chart




This example demonstrates creating a percentage bar chart. It also demonstrates how to include icons in the legend box using CDML.

A percentage bar chart is like a stacked bar chart, except the bars are individually scaled so that they stacked up to 100.

Note that in this example, the legend box contains icons. This is achieved by including the icons in the data set name using CDML.

The key features demonstrated in this example are:

Note that by default, the data label format is {percent}% (showing the percentage) for a percentage bar layer, as opposed to {value} (showing the data value) for other types of bar layer. The data label format can be modified using Layer.setDataLabelFormat.

Source Code Listing

[File: cfdemo/percentbar.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 280 pixels, using 0xffffcc as background
// color, with a black border, and 1 pixel 3D border effect
c = cd.XYChart(500, 280, "0xffffcc", 0, 1);

// Set search path to current directory for loading icon images
c.setSearchPath(GetPageContext());

// Set the plotarea at (50, 45) and of size 320 x 200 pixels. Use white (0xffffff)
// color as background.
c.setPlotArea(50, 45, 320, 200, "0xffffff");

// Add a legend box at (370, 45) using vertical layout and 8 points Arial Bold font.
legendBox = c.addLegend(370, 45, True, "Arial Bold", 8);

// Set the legend box background and border to transparent
legendBox.setBackground(cd.Transparent, cd.Transparent);

// Set the legend box icon size to 16 x 32 pixels to match with custom icon size
legendBox.setKeySize(16, 32);

// Add a title to the chart using 14 points Times Bold Itatic font and white font
// color, and 0x804020 as the background color
c.addTitle("Weekly Product Sales", "Times New Roman Bold Italic", 14, "0xffffff"
    ).setBackground("0x804020");

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

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

// Add the three data sets to the bar layer, using icons images with labels as data
// set names
layer.addDataSet(data0, "0xddaa77",
    "<*block,valign=absmiddle*><*img=service.png*> Service<*/*>");
layer.addDataSet(data1, "0xaadd77",
    "<*block,valign=absmiddle*><*img=software.png*> Software<*/*>");
layer.addDataSet(data2, "0xaa77dd",
    "<*block,valign=absmiddle*><*img=computer.png*> Hardware<*/*>");

// Disable bar borders by setting their colors to transparent
layer.setBorderColor(cd.Transparent);

// Enable data label at the middle of the the bar
layer.setDataLabelStyle().setAlignment(cd.Center);

// For a vertical stacked chart with positive data only, the last data set is always
// on top. However, in a vertical legend box, the last data set is at the bottom.
// This can be reversed by using the setLegend method.
layer.setLegend(cd.ReverseLegend);

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

// Include tool tip for the chart
imageMap1 = c.getHTMLImageMap("", "",
    "title='{dataSetName} revenue on {xLabel}: US${value}K ({percent}%)'");

</cfscript>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Percentage 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>