ChartDirector 6.1 (Java Edition)

Polar Spline Chart




This example demonstrates polar spline line and polar spline area.

The polar spline line is created using PolarChart.addSplineLineLayer. The polar spline area is created using PolarChart.addSplineAreaLayer.

Source Code Listing

[JSP Version] jspdemo/polarspline.jsp
<%@page import="ChartDirector.*" %>
<%
// The data for the chart
double[] data0 = {5.1, 2.6, 1.5, 2.2, 5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5, 9.4, 1.8, 2.1, 2.3,
    3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3};
double[] angles0 = {0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240,
    255, 270, 285, 300, 315, 330, 345};

double[] data1 = {8.1, 2.5, 5, 5.2, 6.5, 8.5, 9, 7.6, 8.7, 6.4, 5.5, 5.4, 3.0, 8.7, 7.1, 8.8, 7.9,
    2.2, 5.0, 4.0, 1.5, 7.5, 8.3, 9.0};
double[] angles1 = {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
PolarChart c = new PolarChart(460, 460);

// Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
c.addTitle2(Chart.TopLeft, "<*underline=2*>EM Field Strength", "Arial Bold Italic", 15);

// Set center of plot area at (230, 240) with radius 180 pixels
c.setPlotArea(230, 240, 180);

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

// Add a legend box at the top right corner of the chart using 9pt Arial Bold font
c.addLegend(459, 0, true, "Arial Bold", 9).setAlignment(Chart.TopRight);

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

// Add a red (0xff9999) spline area layer to the chart using (data0, angles0)
c.addSplineAreaLayer(data0, 0xff9999, "Above 100MHz").setAngles(angles0);

// Add a blue (0xff) spline line layer to the chart using (data1, angle1)
PolarSplineLineLayer layer1 = c.addSplineLineLayer(data1, 0x0000ff, "Below 100MHz");
layer1.setAngles(angles1);

// Set the line width to 3 pixels
layer1.setLineWidth(3);

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

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

public class polarspline implements DemoModule
{
    //Name of demo program
    public String toString() { return "Polar Spline 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)
    {
        // The data for the chart
        double[] data0 = {5.1, 2.6, 1.5, 2.2, 5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5, 9.4, 1.8, 2.1,
            2.3, 3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3};
        double[] angles0 = {0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225,
            240, 255, 270, 285, 300, 315, 330, 345};

        double[] data1 = {8.1, 2.5, 5, 5.2, 6.5, 8.5, 9, 7.6, 8.7, 6.4, 5.5, 5.4, 3.0, 8.7, 7.1,
            8.8, 7.9, 2.2, 5.0, 4.0, 1.5, 7.5, 8.3, 9.0};
        double[] angles1 = {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
        PolarChart c = new PolarChart(460, 460);

        // Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
        c.addTitle2(Chart.TopLeft, "<*underline=2*>EM Field Strength", "Arial Bold Italic", 15);

        // Set center of plot area at (230, 240) with radius 180 pixels
        c.setPlotArea(230, 240, 180);

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

        // Add a legend box at the top right corner of the chart using 9pt Arial Bold font
        c.addLegend(459, 0, true, "Arial Bold", 9).setAlignment(Chart.TopRight);

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

        // Add a red (0xff9999) spline area layer to the chart using (data0, angles0)
        c.addSplineAreaLayer(data0, 0xff9999, "Above 100MHz").setAngles(angles0);

        // Add a blue (0xff) spline line layer to the chart using (data1, angle1)
        PolarSplineLineLayer layer1 = c.addSplineLineLayer(data1, 0x0000ff, "Below 100MHz");
        layer1.setAngles(angles1);

        // Set the line width to 3 pixels
        layer1.setLineWidth(3);

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

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='{dataSetName} EM field at {angle} deg: {value} Watt'"));
    }

    //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 polarspline();

        //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);
    }
}