ChartDirector 6.1 (Java Edition)

Multi-Stacked Bar Chart




This example demonstrates combining multi-bar style with stacked bar style. It also demonstrates drawing horizontal bar charts, using icons in axis labels with CDML, customizing legend and bar labels, controlling bar widths and centering legend box.

A multi-stacked bar chart combines the multi-bar style with the stacked bar style by allowing each bar in a multi-bar chart to be a stacked bar. This provides two levels of data grouping. The data from the data sets are clusters based on their index position. Within each cluster, the data are grouped again to form stack bars.

The standard multi-bar chart provides the first level of grouping. The Layer.addDataGroup method is used to provide the second level of grouping.

The key features demonstrated in this example are:

Source Code Listing

[JSP Version] jspdemo/multistackbar.jsp
<%@page import="ChartDirector.*" %>
<%
// The data for the bar chart
double[] data0 = {44, 55, 100};
double[] data1 = {97, 87, 167};
double[] data2 = {156, 78, 147};
double[] data3 = {125, 118, 211};

// The labels for the bar chart. The labels contains embedded images as icons.
String[] labels = {"<*img=service.png*><*br*>Service", "<*img=software.png*><*br*>Software",
    "<*img=computer.png*><*br*>Hardware"};

// Create a XYChart object of size 600 x 350 pixels, using 0xe0e0ff as the background color,
// 0xccccff as the border color, with 1 pixel 3D border effect.
XYChart c = new XYChart(600, 350, 0xe0e0ff, 0xccccff, 1);

//Set search path to current JSP directory for loading icon images
c.setSearchPath(getServletConfig().getServletContext(), request);

// Add a title to the chart using 14 points Times Bold Itatic font and light blue (0x9999ff) as the
// background color
c.addTitle("Business Results 2001 vs 2002", "Times New Roman Bold Italic", 14).setBackground(
    0x9999ff);

// Set the plotarea at (60, 45) and of size 500 x 210 pixels, using white (0xffffff) as the
// background
c.setPlotArea(60, 45, 500, 210, 0xffffff);

// Swap the x and y axes to create a horizontal bar chart
c.swapXY();

// Add a title to the y axis using 11 pt Times Bold Italic as font
c.yAxis().setTitle("Revenue (millions)", "Times New Roman Bold Italic", 11);

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

// Disable x-axis ticks by setting the tick length to 0
c.xAxis().setTickLength(0);

// Add a stacked bar layer to the chart
BarLayer layer = c.addBarLayer2(Chart.Stack);

// Add the first two data sets to the chart as a stacked bar group
layer.addDataGroup("2001");
layer.addDataSet(data0, 0xaaaaff, "Local");
layer.addDataSet(data1, 0x6666ff, "International");

// Add the remaining data sets to the chart as another stacked bar group
layer.addDataGroup("2002");
layer.addDataSet(data2, 0xffaaaa, "Local");
layer.addDataSet(data3, 0xff6666, "International");

// Set the sub-bar gap to 0, so there is no gap between stacked bars with a group
layer.setBarGap(0.2, 0);

// Set the bar border to transparent
layer.setBorderColor(Chart.Transparent);

// Set the aggregate label format
layer.setAggregateLabelFormat("Year {dataGroupName}\n{value} millions");

// Set the aggregate label font to 8 point Arial Bold Italic
layer.setAggregateLabelStyle("Arial Bold Italic", 8);

// Reverse 20% space at the right during auto-scaling to allow space for the aggregate bar labels
c.yAxis().setAutoScale(0.2);

// Add a legend box at (310, 300) using TopCenter alignment, with 2 column grid layout, and use 8pt
// Arial Bold Italic as font
LegendBox legendBox = c.addLegend2(310, 300, 2, "Arial Bold Italic", 8);
legendBox.setAlignment(Chart.TopCenter);

// Set the format of the text displayed in the legend box
legendBox.setText("Year {dataGroupName} {dataSetName} Revenue");

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

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

// Include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("", "",
    "title='Year {dataGroupName} {dataSetName} {xLabel} Revenue: {value} millions'");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Multi-Stacked Bar 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/multistackbar.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class multistackbar implements DemoModule
{
    //Name of demo program
    public String toString() { return "Multi-Stacked Bar 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 bar chart
        double[] data0 = {44, 55, 100};
        double[] data1 = {97, 87, 167};
        double[] data2 = {156, 78, 147};
        double[] data3 = {125, 118, 211};

        // The labels for the bar chart. The labels contains embedded images as icons.
        String[] labels = {"<*img=service.png*><*br*>Service", "<*img=software.png*><*br*>Software",
            "<*img=computer.png*><*br*>Hardware"};

        // Create a XYChart object of size 600 x 350 pixels, using 0xe0e0ff as the background color,
        // 0xccccff as the border color, with 1 pixel 3D border effect.
        XYChart c = new XYChart(600, 350, 0xe0e0ff, 0xccccff, 1);

        // Add a title to the chart using 14 points Times Bold Itatic font and light blue (0x9999ff)
        // as the background color
        c.addTitle("Business Results 2001 vs 2002", "Times New Roman Bold Italic", 14
            ).setBackground(0x9999ff);

        // Set the plotarea at (60, 45) and of size 500 x 210 pixels, using white (0xffffff) as the
        // background
        c.setPlotArea(60, 45, 500, 210, 0xffffff);

        // Swap the x and y axes to create a horizontal bar chart
        c.swapXY();

        // Add a title to the y axis using 11 pt Times Bold Italic as font
        c.yAxis().setTitle("Revenue (millions)", "Times New Roman Bold Italic", 11);

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

        // Disable x-axis ticks by setting the tick length to 0
        c.xAxis().setTickLength(0);

        // Add a stacked bar layer to the chart
        BarLayer layer = c.addBarLayer2(Chart.Stack);

        // Add the first two data sets to the chart as a stacked bar group
        layer.addDataGroup("2001");
        layer.addDataSet(data0, 0xaaaaff, "Local");
        layer.addDataSet(data1, 0x6666ff, "International");

        // Add the remaining data sets to the chart as another stacked bar group
        layer.addDataGroup("2002");
        layer.addDataSet(data2, 0xffaaaa, "Local");
        layer.addDataSet(data3, 0xff6666, "International");

        // Set the sub-bar gap to 0, so there is no gap between stacked bars with a group
        layer.setBarGap(0.2, 0);

        // Set the bar border to transparent
        layer.setBorderColor(Chart.Transparent);

        // Set the aggregate label format
        layer.setAggregateLabelFormat("Year {dataGroupName}\n{value} millions");

        // Set the aggregate label font to 8 point Arial Bold Italic
        layer.setAggregateLabelStyle("Arial Bold Italic", 8);

        // Reverse 20% space at the right during auto-scaling to allow space for the aggregate bar
        // labels
        c.yAxis().setAutoScale(0.2);

        // Add a legend box at (310, 300) using TopCenter alignment, with 2 column grid layout, and
        // use 8pt Arial Bold Italic as font
        LegendBox legendBox = c.addLegend2(310, 300, 2, "Arial Bold Italic", 8);
        legendBox.setAlignment(Chart.TopCenter);

        // Set the format of the text displayed in the legend box
        legendBox.setText("Year {dataGroupName} {dataSetName} Revenue");

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

        // Output the chart
        viewer.setChart(c);

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='Year {dataGroupName} {dataSetName} {xLabel} Revenue: {value} millions'"));
    }

    //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 multistackbar();

        //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);
    }
}