ChartDirector 6.1 (Java Edition)

Simple Rose Chart




This example demonstrates how to create a rose chart.

A rose chart is basically a polar chart with sectors of variable radius. This can be achieved by creating a PolarChart object as the graph paper, and adding sector zones on it using AngularAxis.addZone.

To enable auto-scale of the axis, in this example, we also add the radius data to a transparent line layer using PolarChart.addLineLayer. The line layer has no visible effect, but it causes the radial axis to auto-scale so that it covers the radius data.

Source Code Listing

[JSP Version] jspdemo/rose.jsp
<%@page import="ChartDirector.*" %>
<%
// Data for the chart
double[] data = {9.4, 1.8, 2.1, 2.3, 3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3, 5.1, 2.6, 1.5, 2.2,
    5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5};
double[] angles = {0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255,
    270, 285, 300, 315, 330, 345};

// Create a PolarChart object of size 460 x 460 pixels, with a silver background and a 1 pixel 3D
// border
PolarChart c = new PolarChart(460, 460, Chart.silverColor(), 0x000000, 1);

// Add a title to the chart at the top left corner using 15pt Arial Bold Italic font. Use white text
// on deep blue background.
c.addTitle("Polar Vector Chart Demonstration", "Arial Bold Italic", 15, 0xffffff).setBackground(
    0x000080);

// Set plot area center at (230, 240) with radius 180 pixels and white background
c.setPlotArea(230, 240, 180, 0xffffff);

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

// Set angular axis as 0 - 360, with a spoke every 30 units
c.angularAxis().setLinearScale(0, 360, 30);

// Add sectors to the chart as sector zones
for (int i = 0; i < data.length; ++i) {
    c.angularAxis().addZone(angles[i], angles[i] + 15, 0, data[i], 0x33ff33, 0x008000);
}

// Add an Transparent invisible layer to ensure the axis is auto-scaled using the data
c.addLineLayer(data, Chart.Transparent);

// Output the chart
String chart1URL = c.makeSession(request, "chart1");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Simple Rose 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)%>'>
</body>
</html>

[Java Version] javademo/rose.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class rose implements DemoModule
{
    //Name of demo program
    public String toString() { return "Simple Rose 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[] data = {9.4, 1.8, 2.1, 2.3, 3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3, 5.1, 2.6, 1.5,
            2.2, 5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5};
        double[] angles = {0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225,
            240, 255, 270, 285, 300, 315, 330, 345};

        // Create a PolarChart object of size 460 x 460 pixels, with a silver background and a 1
        // pixel 3D border
        PolarChart c = new PolarChart(460, 460, Chart.silverColor(), 0x000000, 1);

        // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font. Use
        // white text on deep blue background.
        c.addTitle("Polar Vector Chart Demonstration", "Arial Bold Italic", 15, 0xffffff
            ).setBackground(0x000080);

        // Set plot area center at (230, 240) with radius 180 pixels and white background
        c.setPlotArea(230, 240, 180, 0xffffff);

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

        // Set angular axis as 0 - 360, with a spoke every 30 units
        c.angularAxis().setLinearScale(0, 360, 30);

        // Add sectors to the chart as sector zones
        for (int i = 0; i < data.length; ++i) {
            c.angularAxis().addZone(angles[i], angles[i] + 15, 0, data[i], 0x33ff33, 0x008000);
        }

        // Add an Transparent invisible layer to ensure the axis is auto-scaled using the data
        c.addLineLayer(data, Chart.Transparent);

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

    //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 rose();

        //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);
    }
}