ChartDirector 6.1 (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.*" %>
<%
// 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
String chart1URL = c.makeSession(request, "chart1", Chart.JPG);

// Include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Pareto Chart
</div>
<hr color="#000080">
<div style="font-size:10pt; font-family:verdana; margin-bottom:1.5em">
    <a href="viewsource.jsp?file=<%=request.getServletPath()%>">View Source Code</a>
</div>
<img src='<%=response.encodeURL("getchart.jsp?"+chart1URL)%>'
    usemap="#map1" border="0">
<map name="map1"><%=imageMap1%></map>
</body>
</html>

[Java Version] javademo/pareto.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class pareto implements DemoModule
{
    //Name of demo program
    public String toString() { return "Pareto Chart"; }

    //Number of charts produced in this demo
    public int getNoOfCharts() { return 1; }

    //Main code for creating charts
    public void createChart(ChartViewer viewer, int chartIndex)
    {
        // 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
        viewer.setChart(c);

        // Include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable"));
    }

    //Allow this module to run as standalone program for easy testing
    public static void main(String[] args)
    {
        //Instantiate an instance of this demo module
        DemoModule demo = new pareto();

        //Create and set up the main window
        JFrame frame = new JFrame(demo.toString());
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);} });
        frame.getContentPane().setBackground(Color.white);

        // Create the chart and put them in the content pane
        ChartViewer viewer = new ChartViewer();
        demo.createChart(viewer, 0);
        frame.getContentPane().add(viewer);

        // Display the window
        frame.pack();
        frame.setVisible(true);
    }
}