ChartDirector 7.0 (Java Edition)

Percentage Bar Chart




This example demonstrates creating a percentage bar chart with a legend box. It also demonstrates gradient background color, rounded frame, soft drop shadow, and using CDML to include custom icons in the legend box.

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

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

[JSP Version] jspdemo/percentbar.jsp
<%@page import="ChartDirector.*, java.util.*" %> <% // The data for the bar chart double[] data0 = {100, 125, 245, 147, 67}; double[] data1 = {85, 156, 179, 211, 123}; double[] data2 = {97, 87, 56, 267, 157}; // The labels for the bar chart String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri"}; // Create a XYChart object of size 500 x 320 pixels. Use a vertical gradient color from pale blue // (e8f0f8) to sky blue (aaccff) spanning half the chart height as background. Set border to blue // (88aaee). Use rounded corners. Enable soft drop shadow. XYChart c = new XYChart(500, 320); c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight() / 2, 0xe8f0f8, 0xaaccff), 0x88aaee); c.setRoundedFrame(); c.setDropShadow(); //Set search path to current JSP directory for loading icon images c.setSearchPath(getServletConfig().getServletContext(), request); // Add a title to the chart using 15 points Arial Italic. Set top/bottom margins to 15 pixels. TextBox title = c.addTitle("Weekly Product Sales", "Arial Italic", 15); title.setMargin2(0, 0, 15, 15); // Tentatively set the plotarea to 50 pixels from the left edge, and to just under the title. Set // the width to 60% of the chart width, and the height to 50 pixels from the bottom edge. Use pale // blue (e8f0f8) background, transparent border, and grey (aaaaaa) grid lines. c.setPlotArea(50, title.getHeight(), c.getWidth() * 6 / 10, c.getHeight() - title.getHeight() - 50, 0xe8f0f8, -1, Chart.Transparent, 0xaaaaaa); // Add a legend box where the top-right corner is anchored at 10 pixels from the right edge, and // just under the title. Use vertical layout and 8 points Arial font. LegendBox legendBox = c.addLegend(c.getWidth() - 10, title.getHeight(), true, "Arial", 8); legendBox.setAlignment(Chart.TopRight); // Set the legend box background and border to transparent legendBox.setBackground(Chart.Transparent, Chart.Transparent); // Set the legend box icon size to 16 x 32 pixels to match with custom icon size legendBox.setKeySize(16, 32); // Set axes to transparent c.xAxis().setColors(Chart.Transparent); c.yAxis().setColors(Chart.Transparent); // Set the labels on the x axis c.xAxis().setLabels(labels); // Add a percentage bar layer BarLayer layer = c.addBarLayer2(Chart.Percentage); // Add the three data sets to the bar layer, using icons images with labels as data set names layer.addDataSet(data0, 0x66aaee, "<*block,valign=absmiddle*><*img=service.png*> Service<*/*>"); layer.addDataSet(data1, 0xeebb22, "<*block,valign=absmiddle*><*img=software.png*> Software<*/*>"); layer.addDataSet(data2, 0xcc88ff, "<*block,valign=absmiddle*><*img=computer.png*> Hardware<*/*>"); // Use soft lighting effect with light direction from top layer.setBorderColor(Chart.Transparent, Chart.softLighting(Chart.Top)); // Enable data label at the middle of the the bar layer.setDataLabelStyle().setAlignment(Chart.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(Chart.ReverseLegend); // Adjust the plot area size, such that the bounding box (inclusive of axes) is 15 pixels from the // left edge, just below the title, 10 pixels to the right of the legend box, and 15 pixels from the // bottom edge. c.packPlotArea(15, title.getHeight(), c.layoutLegend().getLeftX() - 10, c.getHeight() - 15); // Output the chart WebChartViewer viewer = new WebChartViewer(request, "chart1"); viewer.setChart(c, Chart.SVG); // Include tool tip for the chart viewer.setImageMap(c.getHTMLImageMap("", "", "title='{dataSetName} revenue on {xLabel}: US${value}K ({percent}%)'")); %> <!DOCTYPE html> <html> <head> <title>Percentage Bar 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;"> Percentage Bar Chart </div> <hr style="border:solid 1px #000080; background:#000080" /> <div style="font:10pt verdana; margin-bottom:1.5em"> <a href="viewsource.jsp?file=<%=request.getServletPath()%>">View Source Code</a> </div> <!-- ****** Here is the chart image ****** --> <%= viewer.renderHTML(response) %> </body> </html>