ChartDirector 5.1 (Java Edition)

Stacked Bar Chart




This example demonstrates creating a stacked bar chart, completed with bar labels and legend box.

The key features demonstrated in this example are:

For bar labels, Layer.setDataLabelStyle and Layer.setAggregateLabelStyle control the styles (fonts, colors, backgrounds, etc), while Layer.setDataLabelFormat and Layer.setAggregateLabelFormat control the formats (the contents of the label, number of decimal points in numbers, etc). You may also add custom labels to the bars using Layer.addCustomDataLabel and Layer.addCustomAggregateLabel and Layer.addCustomGroupLabel.

Source Code Listing

[JSP Version] jspdemo/stackedbar.jsp
<%@page import="ChartDirector.*" %>
<%
// 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
XYChart c = new XYChart(500, 320);

// Set the plotarea at (100, 40) and of size 280 x 240 pixels
c.setPlotArea(100, 40, 280, 240);

// Add a legend box at (400, 100)
c.addLegend(400, 100);

// Add a title to the chart using 14 points Times Bold Itatic font
c.addTitle("Weekday Network Load", "Times New Roman Bold Italic", 14);

// Add a title to the y axis. Draw the title upright (font angle = 0)
c.yAxis().setTitle("Average\nWorkload\n(MBytes\nPer Hour)").setFontAngle(0);

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

// Add a stacked bar layer and set the layer 3D depth to 8 pixels
BarLayer layer = c.addBarLayer2(Chart.Stack, 8);

// Add the three data sets to the bar layer
layer.addDataSet(data0, 0xff8080, "Server # 1");
layer.addDataSet(data1, 0x80ff80, "Server # 2");
layer.addDataSet(data2, 0x8080ff, "Server # 3");

// Enable bar label for the whole bar
layer.setAggregateLabelStyle();

// Enable bar label for each segment of the stacked bar
layer.setDataLabelStyle();

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

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

public class stackedbar implements DemoModule
{
    //Name of demo program
    public String toString() { return "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 index)
    {
        // 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
        XYChart c = new XYChart(500, 320);

        // Set the plotarea at (100, 40) and of size 280 x 240 pixels
        c.setPlotArea(100, 40, 280, 240);

        // Add a legend box at (400, 100)
        c.addLegend(400, 100);

        // Add a title to the chart using 14 points Times Bold Itatic font
        c.addTitle("Weekday Network Load", "Times New Roman Bold Italic", 14);

        // Add a title to the y axis. Draw the title upright (font angle = 0)
        c.yAxis().setTitle("Average\nWorkload\n(MBytes\nPer Hour)").setFontAngle(0);

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

        // Add a stacked bar layer and set the layer 3D depth to 8 pixels
        BarLayer layer = c.addBarLayer2(Chart.Stack, 8);

        // Add the three data sets to the bar layer
        layer.addDataSet(data0, 0xff8080, "Server # 1");
        layer.addDataSet(data1, 0x80ff80, "Server # 2");
        layer.addDataSet(data2, 0x8080ff, "Server # 3");

        // Enable bar label for the whole bar
        layer.setAggregateLabelStyle();

        // Enable bar label for each segment of the stacked bar
        layer.setDataLabelStyle();

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

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='{dataSetName} on {xLabel}: {value} MBytes/hour'"));
    }

    //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 stackedbar();

        //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);
    }
}