ChartDirector 6.1 (Java Edition)

Polar Area Chart




This examples demonstrates a polar area chart.

The polar area layer is created using PolarChart.addAreaLayer. In this example, 3 area layers are used. The area data are already stacked before passing to ChartDirector.

Source Code Listing

[JSP Version] jspdemo/polararea.jsp
<%@page import="ChartDirector.*" %>
<%
// Data for the chart
double[] data0 = {5, 3, 10, 4, 3, 5, 2, 5};
double[] data1 = {12, 6, 17, 6, 7, 9, 4, 7};
double[] data2 = {17, 7, 22, 7, 18, 13, 5, 11};

String[] labels = {"North", "North<*br*>East", "East", "South<*br*>East", "South",
    "South<*br*>West", "West", "North<*br*>West"};

// Create a PolarChart object of size 460 x 500 pixels, with a grey (e0e0e0) background and 1 pixel
// 3D border
PolarChart c = new PolarChart(460, 500, 0xe0e0e0, 0x000000, 1);

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

// Add a title to the chart at the top left corner using 15pt Arial Bold Italic font. Use a wood
// pattern as the title background.
c.addTitle("Polar Area Chart Demo", "Arial Bold Italic", 15).setBackground(c.patternColor("wood.png"
    ));

// Set center of plot area at (230, 280) with radius 180 pixels, and white (ffffff) background.
c.setPlotArea(230, 280, 180, 0xffffff);

// Set the grid style to circular grid
c.setGridStyle(false);

// Add a legend box at top-center of plot area (230, 35) using horizontal layout. Use 10pt Arial
// Bold font, with 1 pixel 3D border effect.
LegendBox b = c.addLegend(230, 35, false, "Arial Bold", 9);
b.setAlignment(Chart.TopCenter);
b.setBackground(Chart.Transparent, Chart.Transparent, 1);

// Set angular axis using the given labels
c.angularAxis().setLabels(labels);

// Specify the label format for the radial axis
c.radialAxis().setLabelFormat("{value}%");

// Set radial axis label background to semi-transparent grey (40cccccc)
c.radialAxis().setLabelStyle().setBackground(0x40cccccc, 0);

// Add the data as area layers
c.addAreaLayer(data2, -1, "5 m/s or above");
c.addAreaLayer(data1, -1, "1 - 5 m/s");
c.addAreaLayer(data0, -1, "less than 1 m/s");

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

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

public class polararea implements DemoModule
{
    //Name of demo program
    public String toString() { return "Polar Area 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)
    {
        // Data for the chart
        double[] data0 = {5, 3, 10, 4, 3, 5, 2, 5};
        double[] data1 = {12, 6, 17, 6, 7, 9, 4, 7};
        double[] data2 = {17, 7, 22, 7, 18, 13, 5, 11};

        String[] labels = {"North", "North<*br*>East", "East", "South<*br*>East", "South",
            "South<*br*>West", "West", "North<*br*>West"};

        // Create a PolarChart object of size 460 x 500 pixels, with a grey (e0e0e0) background and
        // 1 pixel 3D border
        PolarChart c = new PolarChart(460, 500, 0xe0e0e0, 0x000000, 1);

        // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font. Use a
        // wood pattern as the title background.
        c.addTitle("Polar Area Chart Demo", "Arial Bold Italic", 15).setBackground(c.patternColor(
            "wood.png"));

        // Set center of plot area at (230, 280) with radius 180 pixels, and white (ffffff)
        // background.
        c.setPlotArea(230, 280, 180, 0xffffff);

        // Set the grid style to circular grid
        c.setGridStyle(false);

        // Add a legend box at top-center of plot area (230, 35) using horizontal layout. Use 10pt
        // Arial Bold font, with 1 pixel 3D border effect.
        LegendBox b = c.addLegend(230, 35, false, "Arial Bold", 9);
        b.setAlignment(Chart.TopCenter);
        b.setBackground(Chart.Transparent, Chart.Transparent, 1);

        // Set angular axis using the given labels
        c.angularAxis().setLabels(labels);

        // Specify the label format for the radial axis
        c.radialAxis().setLabelFormat("{value}%");

        // Set radial axis label background to semi-transparent grey (40cccccc)
        c.radialAxis().setLabelStyle().setBackground(0x40cccccc, 0);

        // Add the data as area layers
        c.addAreaLayer(data2, -1, "5 m/s or above");
        c.addAreaLayer(data1, -1, "1 - 5 m/s");
        c.addAreaLayer(data0, -1, "less than 1 m/s");

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

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='[{label}] {dataSetName}: {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 polararea();

        //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);
    }
}