ChartDirector 6.1 (Java Edition)

Bar Labels




This example extends the Simple Bar Chart (1) example by including bar labels on the bars, and decorating the bars with rounded corners and gradient shading.

Source Code Listing

[JSP Version] jspdemo/barlabel.jsp
<%@page import="ChartDirector.*" %>
<%
// The data for the bar chart
double[] data = {85, 156, 179, 211, 123, 189, 166};

// The labels for the bar chart
String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};

// Create a XYChart object of size 600 x 360 pixels
XYChart c = new XYChart(600, 360);

// Set the plotarea at (70, 20) and of size 500 x 300 pixels, with transparent background and border
// and light grey (0xcccccc) horizontal grid lines
c.setPlotArea(70, 20, 500, 300, Chart.Transparent, -1, Chart.Transparent, 0xcccccc);

// Set the x and y axis stems to transparent and the label font to 12pt Arial
c.xAxis().setColors(Chart.Transparent);
c.yAxis().setColors(Chart.Transparent);
c.xAxis().setLabelStyle("Arial", 12);
c.yAxis().setLabelStyle("Arial", 12);

// Add a blue (0x6699bb) bar chart layer using the given data
BarLayer layer = c.addBarLayer(data, 0x6699bb);

// Use bar gradient lighting with the light intensity from 0.8 to 1.3
layer.setBorderColor(Chart.Transparent, Chart.barLighting(0.8, 1.3));

// Set rounded corners for bars
layer.setRoundedCorners();

// Display labela on top of bars using 12pt Arial font
layer.setAggregateLabelStyle("Arial", 12);

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

// For the automatic y-axis labels, set the minimum spacing to 40 pixels.
c.yAxis().setTickDensity(40);

// Add a title to the y axis using dark grey (0x555555) 14pt Arial Bold font
c.yAxis().setTitle("Y-Axis Title Placeholder", "Arial Bold", 14, 0x555555);

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

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

public class barlabel implements DemoModule
{
    //Name of demo program
    public String toString() { return "Bar Labels"; }

    //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[] data = {85, 156, 179, 211, 123, 189, 166};

        // The labels for the bar chart
        String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};

        // Create a XYChart object of size 600 x 360 pixels
        XYChart c = new XYChart(600, 360);

        // Set the plotarea at (70, 20) and of size 500 x 300 pixels, with transparent background
        // and border and light grey (0xcccccc) horizontal grid lines
        c.setPlotArea(70, 20, 500, 300, Chart.Transparent, -1, Chart.Transparent, 0xcccccc);

        // Set the x and y axis stems to transparent and the label font to 12pt Arial
        c.xAxis().setColors(Chart.Transparent);
        c.yAxis().setColors(Chart.Transparent);
        c.xAxis().setLabelStyle("Arial", 12);
        c.yAxis().setLabelStyle("Arial", 12);

        // Add a blue (0x6699bb) bar chart layer using the given data
        BarLayer layer = c.addBarLayer(data, 0x6699bb);

        // Use bar gradient lighting with the light intensity from 0.8 to 1.3
        layer.setBorderColor(Chart.Transparent, Chart.barLighting(0.8, 1.3));

        // Set rounded corners for bars
        layer.setRoundedCorners();

        // Display labela on top of bars using 12pt Arial font
        layer.setAggregateLabelStyle("Arial", 12);

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

        // For the automatic y-axis labels, set the minimum spacing to 40 pixels.
        c.yAxis().setTickDensity(40);

        // Add a title to the y axis using dark grey (0x555555) 14pt Arial Bold font
        c.yAxis().setTitle("Y-Axis Title Placeholder", "Arial Bold", 14, 0x555555);

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

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

    //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 barlabel();

        //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);
    }
}