ChartDirector 7.0 (Java Edition)

Pareto Chart




This example demonstrates the pareto chart style.

A pareto chart is a bar chart with the data sorted in descending order, together with a line chart showing the same data in accumulated form. In the current example, the data is shown as both percentages and values on the two y-axes.

The chart in this example is composed of two layers - a BarLayer created using XYChart.addBarLayer, and a LineLayer created using XYChart.addLineLayer.

This example employs the ArrayMath utility class for computing the accumulated line, obtaining the scaling factor between the two y-axes, and re-scaling the line data as percentages.

The two y-axes are synchronized using Axis.syncAxis.

Source Code Listing

[JSP Version] jspdemo/pareto.jsp
<%@page import="ChartDirector.*, java.util.*" %> <% // The data for the chart double[] data = {40, 15, 7, 5, 2}; // The labels for the chart String[] labels = {"Hard Disk", "PCB", "Printer", "CDROM", "Keyboard"}; // In the pareto chart, the line data are just the accumulation of the raw data, scaled to a range // of 0 - 100% ArrayMath lineData = new ArrayMath(data); lineData.acc(); double scaleFactor = lineData.max() / 100; if (scaleFactor == 0) { // Avoid division by zero error for zero data scaleFactor = 1; } lineData.div2(scaleFactor); // Create a XYChart object of size 480 x 300 pixels. Set background color to brushed silver, with a // grey (bbbbbb) border and 2 pixel 3D raised effect. Use rounded corners. Enable soft drop shadow. XYChart c = new XYChart(400, 300, Chart.brushedSilverColor(), 0xbbbbbb, 2); c.setRoundedFrame(); c.setDropShadow(); // Add a title to the chart using 15 points Arial Italic. Set top/bottom margins to 12 pixels. TextBox title = c.addTitle("Pareto Chart Demonstration", "Arial Italic", 15); title.setMargin2(0, 0, 12, 12); // Tentatively set the plotarea at (50, 40). Set the width to 100 pixels less than the chart width, // and the height to 80 pixels less than the chart height. Use pale grey (f4f4f4) background, // transparent border, and dark grey (444444) dotted grid lines. c.setPlotArea(50, 40, c.getWidth() - 100, c.getHeight() - 80, 0xf4f4f4, -1, Chart.Transparent, c.dashLineColor(0x444444, Chart.DotLine)); // Add a line layer for the pareto line LineLayer lineLayer = c.addLineLayer2(); // Add the pareto line using deep blue (0000ff) as the color, with circle symbols lineLayer.addDataSet(lineData.result(), 0x0000ff).setDataSymbol(Chart.CircleShape, 9, 0x0000ff, 0x0000ff); // Set the line width to 2 pixel lineLayer.setLineWidth(2); // Bind the line layer to the secondary (right) y-axis. lineLayer.setUseYAxis2(); // Tool tip for the line layer lineLayer.setHTMLImageMap("", "", "title='Top {={x}+1} items: {value|2}%'"); // Add a multi-color bar layer using the given data. BarLayer barLayer = c.addBarLayer3(data); // Set soft lighting for the bars with light direction from the right barLayer.setBorderColor(Chart.Transparent, Chart.softLighting(Chart.Right)); // Tool tip for the bar layer barLayer.setHTMLImageMap("", "", "title='{xLabel}: {value} pieces'"); // Set the labels on the x axis. c.xAxis().setLabels(labels); // Set the secondary (right) y-axis scale as 0 - 100 with a tick every 20 units c.yAxis2().setLinearScale(0, 100, 20); // Set the format of the secondary (right) y-axis label to include a percentage sign c.yAxis2().setLabelFormat("{value}%"); // Set the relationship between the two y-axes, which only differ by a scaling factor c.yAxis().syncAxis(c.yAxis2(), scaleFactor); // Set the format of the primary y-axis label foramt to show no decimal point c.yAxis().setLabelFormat("{value|0}"); // Add a title to the primary y-axis c.yAxis().setTitle("Frequency"); // Set all axes to transparent c.xAxis().setColors(Chart.Transparent); c.yAxis().setColors(Chart.Transparent); c.yAxis2().setColors(Chart.Transparent); // Adjust the plot area size, such that the bounding box (inclusive of axes) is 10 pixels from the // left edge, just below the title, 10 pixels from the right edge, and 20 pixels from the bottom // edge. c.packPlotArea(10, title.getHeight(), c.getWidth() - 10, c.getHeight() - 20); // Output the chart WebChartViewer viewer = new WebChartViewer(request, "chart1"); viewer.setChart(c, Chart.SVG); // Include tool tip for the chart viewer.setImageMap(c.getHTMLImageMap("")); %> <!DOCTYPE html> <html> <head> <title>Pareto 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;"> Pareto 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>