ChartDirector 6.1 (Java Edition)

Circular Zones




This example demonstrates adding circular zones to a polar chart.

In ChartDirector, a zone defined on the radial axis will mark a radius range, and so will appear as ring on a polar chart.

This example contains three circular zones in the plot area background, colored as red, green and blue. The blue region is the original background of the plot area, while the red and green regions are added using Axis.addZone of the radial axis object.

Source Code Listing

[JSP Version] jspdemo/polarzones.jsp
<%@page import="ChartDirector.*" %>
<%
// The data for the chart
double[] data = {51, 15, 51, 40, 17, 87, 94, 21, 35, 88, 50, 60};

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

// Create a PolarChart object of size 400 x 420 pixels
PolarChart c = new PolarChart(400, 420);

// Set background color to a 2 pixel pattern color, with a black border and 1 pixel 3D border effect
c.setBackground(c.patternColor(new int[]{0xffffff, 0xe0e0e0}, 2), 0, 1);

// Add a title to the chart using 16pt Arial Bold Italic font. The title text is white (0xffffff) on
// 2 pixel pattern background
c.addTitle("Chemical Concentration", "Arial Bold Italic", 16, 0xffffff).setBackground(
    c.patternColor(new int[]{0x000000, 0x000080}, 2));

// Set center of plot area at (200, 240) with radius 145 pixels. Set background color to blue
// (9999ff)
c.setPlotArea(200, 240, 145, 0x9999ff);

// Color the region between radius = 40 to 80 as green (99ff99)
c.radialAxis().addZone(40, 80, 0x99ff99);

// Color the region with radius > 80 as red (ff9999)
c.radialAxis().addZone(80, 999, 0xff9999);

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

// Set the radial axis label format
c.radialAxis().setLabelFormat("{value} ppm");

// Use semi-transparent (40ffffff) label background so as not to block the data
c.radialAxis().setLabelStyle().setBackground(0x40ffffff, 0x40000000);

// Add a legend box at (200, 30) top center aligned, using 9pt Arial Bold font. with a black border.
LegendBox legendBox = c.addLegend(200, 30, false, "Arial Bold", 9);
legendBox.setAlignment(Chart.TopCenter);

// Add legend keys to represent the red/green/blue zones
legendBox.addKey("Under-Absorp", 0x9999ff);
legendBox.addKey("Normal", 0x99ff99);
legendBox.addKey("Over-Absorp", 0xff9999);

// Add a blue (000080) spline line layer with line width set to 3 pixels and using yellow (ffff00)
// circles to represent the data points
PolarSplineLineLayer layer = c.addSplineLineLayer(data, 0x000080);
layer.setLineWidth(3);
layer.setDataSymbol(Chart.CircleShape, 11, 0xffff00);

// Set the labels to the angular axis as spokes.
c.angularAxis().setLabels(labels);

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

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

public class polarzones implements DemoModule
{
    //Name of demo program
    public String toString() { return "Circular Zones"; }

    //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 chart
        double[] data = {51, 15, 51, 40, 17, 87, 94, 21, 35, 88, 50, 60};

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

        // Create a PolarChart object of size 400 x 420 pixels
        PolarChart c = new PolarChart(400, 420);

        // Set background color to a 2 pixel pattern color, with a black border and 1 pixel 3D
        // border effect
        c.setBackground(c.patternColor(new int[]{0xffffff, 0xe0e0e0}, 2), 0, 1);

        // Add a title to the chart using 16pt Arial Bold Italic font. The title text is white
        // (0xffffff) on 2 pixel pattern background
        c.addTitle("Chemical Concentration", "Arial Bold Italic", 16, 0xffffff).setBackground(
            c.patternColor(new int[]{0x000000, 0x000080}, 2));

        // Set center of plot area at (200, 240) with radius 145 pixels. Set background color to
        // blue (9999ff)
        c.setPlotArea(200, 240, 145, 0x9999ff);

        // Color the region between radius = 40 to 80 as green (99ff99)
        c.radialAxis().addZone(40, 80, 0x99ff99);

        // Color the region with radius > 80 as red (ff9999)
        c.radialAxis().addZone(80, 999, 0xff9999);

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

        // Set the radial axis label format
        c.radialAxis().setLabelFormat("{value} ppm");

        // Use semi-transparent (40ffffff) label background so as not to block the data
        c.radialAxis().setLabelStyle().setBackground(0x40ffffff, 0x40000000);

        // Add a legend box at (200, 30) top center aligned, using 9pt Arial Bold font. with a black
        // border.
        LegendBox legendBox = c.addLegend(200, 30, false, "Arial Bold", 9);
        legendBox.setAlignment(Chart.TopCenter);

        // Add legend keys to represent the red/green/blue zones
        legendBox.addKey("Under-Absorp", 0x9999ff);
        legendBox.addKey("Normal", 0x99ff99);
        legendBox.addKey("Over-Absorp", 0xff9999);

        // Add a blue (000080) spline line layer with line width set to 3 pixels and using yellow
        // (ffff00) circles to represent the data points
        PolarSplineLineLayer layer = c.addSplineLineLayer(data, 0x000080);
        layer.setLineWidth(3);
        layer.setDataSymbol(Chart.CircleShape, 11, 0xffff00);

        // Set the labels to the angular axis as spokes.
        c.angularAxis().setLabels(labels);

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

        // Include tool tip for the chart.
        viewer.setImageMap(layer.getHTMLImageMap("clickable", "",
            "title='Concentration on {label}: {value} ppm'"));
    }

    //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 polarzones();

        //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);
    }
}