ChartDirector 6.1 (Java Edition)

Positive Negative Bars




This example demonstrates a bar chart containing positive and negative data, represented by different colors.

In this example, the two colors of the plot area background are configured using background zones, while the bar colors are configured by splitting the bars into two layers.

Source Code Listing

[JSP Version] jspdemo/posnegbar.jsp
<%@page import="ChartDirector.*" %>
<%
// The data for the bar chart
double[] data = {-6.3, 2.3, 0.7, -3.4, 2.2, -2.9, -0.1, -0.1, 3.3, 6.2, 4.3, 1.6};

// The labels for the bar chart
String[] labels = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov",
    "Dec"};

// Create a XYChart object of size 500 x 320 pixels
XYChart c = new XYChart(500, 320);

// Add a title to the chart using Arial Bold Italic font
c.addTitle("Productivity Change - Year 2005", "Arial Bold Italic");

// Set the plotarea at (50, 30) and of size 400 x 250 pixels
c.setPlotArea(50, 30, 400, 250);

// Add a bar layer to the chart using the Overlay data combine method
BarLayer layer = c.addBarLayer2(Chart.Overlay);

// Select positive data and add it as data set with blue (6666ff) color
layer.addDataSet(new ArrayMath(data).selectGEZ(null, Chart.NoValue).result(), 0x6666ff);

// Select negative data and add it as data set with orange (ff6600) color
layer.addDataSet(new ArrayMath(data).selectLTZ(null, Chart.NoValue).result(), 0xff6600);

// Add labels to the top of the bar using 8 pt Arial Bold font. The font color is configured to be
// red (0xcc3300) below zero, and blue (0x3333ff) above zero.
layer.setAggregateLabelStyle("Arial Bold", 8, layer.yZoneColor(0, 0xcc3300, 0x3333ff));

// Set the labels on the x axis and use Arial Bold as the label font
c.xAxis().setLabels(labels).setFontStyle("Arial Bold");

// Draw the y axis on the right of the plot area
c.setYAxisOnRight(true);

// Use Arial Bold as the y axis label font
c.yAxis().setLabelStyle("Arial Bold");

// Add a title to the y axis
c.yAxis().setTitle("Percentage");

// Add a light blue (0xccccff) zone for positive part of the plot area
c.yAxis().addZone(0, 9999, 0xccccff);

// Add a pink (0xffffcc) zone for negative part of the plot area
c.yAxis().addZone(-9999, 0, 0xffcccc);

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

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

public class posnegbar implements DemoModule
{
    //Name of demo program
    public String toString() { return "Positive Negative Bars"; }

    //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 = {-6.3, 2.3, 0.7, -3.4, 2.2, -2.9, -0.1, -0.1, 3.3, 6.2, 4.3, 1.6};

        // The labels for the bar chart
        String[] labels = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct",
            "Nov", "Dec"};

        // Create a XYChart object of size 500 x 320 pixels
        XYChart c = new XYChart(500, 320);

        // Add a title to the chart using Arial Bold Italic font
        c.addTitle("Productivity Change - Year 2005", "Arial Bold Italic");

        // Set the plotarea at (50, 30) and of size 400 x 250 pixels
        c.setPlotArea(50, 30, 400, 250);

        // Add a bar layer to the chart using the Overlay data combine method
        BarLayer layer = c.addBarLayer2(Chart.Overlay);

        // Select positive data and add it as data set with blue (6666ff) color
        layer.addDataSet(new ArrayMath(data).selectGEZ(null, Chart.NoValue).result(), 0x6666ff);

        // Select negative data and add it as data set with orange (ff6600) color
        layer.addDataSet(new ArrayMath(data).selectLTZ(null, Chart.NoValue).result(), 0xff6600);

        // Add labels to the top of the bar using 8 pt Arial Bold font. The font color is configured
        // to be red (0xcc3300) below zero, and blue (0x3333ff) above zero.
        layer.setAggregateLabelStyle("Arial Bold", 8, layer.yZoneColor(0, 0xcc3300, 0x3333ff));

        // Set the labels on the x axis and use Arial Bold as the label font
        c.xAxis().setLabels(labels).setFontStyle("Arial Bold");

        // Draw the y axis on the right of the plot area
        c.setYAxisOnRight(true);

        // Use Arial Bold as the y axis label font
        c.yAxis().setLabelStyle("Arial Bold");

        // Add a title to the y axis
        c.yAxis().setTitle("Percentage");

        // Add a light blue (0xccccff) zone for positive part of the plot area
        c.yAxis().addZone(0, 9999, 0xccccff);

        // Add a pink (0xffffcc) zone for negative part of the plot area
        c.yAxis().addZone(-9999, 0, 0xffcccc);

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

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

    //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 posnegbar();

        //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);
    }
}