ChartDirector 6.1 (Java Edition)

Donut Width


        

This example demonstrates the effects of different donut widths.

Donut widths are configured by using different inner and outer radii when calling PieChart.setDonutSize.

Source Code Listing

[JSP Version] jspdemo/donutwidth.jsp
<%@page import="ChartDirector.*" %>
<%@page import="javax.servlet.http.*" %>
<%!
// A simple structure to represent a chart image with an image map
private static class ImageWithHotSpot
{
    String imageURL;
    String imageMap;
}

// Function to create the demo charts
ImageWithHotSpot createChart(HttpServletRequest request, int chartIndex)
{
    // Determine the donut inner radius (as percentage of outer radius) based on input parameter
    int donutRadius = chartIndex * 25;

    // The data for the pie chart
    double[] data = {10, 10, 10, 10, 10};

    // The labels for the pie chart
    String[] labels = {"Marble", "Wood", "Granite", "Plastic", "Metal"};

    // Create a PieChart object of size 150 x 120 pixels, with a grey (EEEEEE) background, black
    // border and 1 pixel 3D border effect
    PieChart c = new PieChart(150, 120, 0xeeeeee, 0x000000, 1);

    // Set donut center at (75, 65) and the outer radius to 50 pixels. Inner radius is computed
    // according donutWidth
    c.setDonutSize(75, 60, 50, (int)(50 * donutRadius / 100));

    // Add a title to show the donut width
    c.addTitle("Inner Radius = " + donutRadius + " %", "Arial", 10).setBackground(0xcccccc, 0);

    // Draw the pie in 3D
    c.set3D(12);

    // Set the pie data and the pie labels
    c.setData(data, labels);

    // Disable the sector labels by setting the color to Transparent
    c.setLabelStyle("", 8, Chart.Transparent);

    // Output the chart
    ImageWithHotSpot ret = new ImageWithHotSpot();
    ret.imageURL = c.makeSession(request, "chart" + chartIndex);

    // Include tool tip for the chart
    ret.imageMap = c.getHTMLImageMap("", "", "title='{label}: {value}kg ({percent}%)'");

    return ret;
}
%>
<%
ImageWithHotSpot chart0 = createChart(request, 0);
ImageWithHotSpot chart1 = createChart(request, 1);
ImageWithHotSpot chart2 = createChart(request, 2);
ImageWithHotSpot chart3 = createChart(request, 3);
ImageWithHotSpot chart4 = createChart(request, 4);
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Donut Width
</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?"+chart0.imageURL)%>'
    usemap="#map0" border="0">
<map name="map0"><%=chart0.imageMap%></map>
<img src='<%=response.encodeURL("getchart.jsp?"+chart1.imageURL)%>'
    usemap="#map1" border="0">
<map name="map1"><%=chart1.imageMap%></map>
<img src='<%=response.encodeURL("getchart.jsp?"+chart2.imageURL)%>'
    usemap="#map2" border="0">
<map name="map2"><%=chart2.imageMap%></map>
<img src='<%=response.encodeURL("getchart.jsp?"+chart3.imageURL)%>'
    usemap="#map3" border="0">
<map name="map3"><%=chart3.imageMap%></map>
<img src='<%=response.encodeURL("getchart.jsp?"+chart4.imageURL)%>'
    usemap="#map4" border="0">
<map name="map4"><%=chart4.imageMap%></map>
</body>
</html>

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

public class donutwidth implements DemoModule
{
    //Name of demo program
    public String toString() { return "Donut Width"; }

    //Number of charts produced in this demo
    public int getNoOfCharts() { return 5; }

    //Main code for creating charts
    public void createChart(ChartViewer viewer, int chartIndex)
    {
        // Determine the donut inner radius (as percentage of outer radius) based on input parameter
        int donutRadius = chartIndex * 25;

        // The data for the pie chart
        double[] data = {10, 10, 10, 10, 10};

        // The labels for the pie chart
        String[] labels = {"Marble", "Wood", "Granite", "Plastic", "Metal"};

        // Create a PieChart object of size 150 x 120 pixels, with a grey (EEEEEE) background, black
        // border and 1 pixel 3D border effect
        PieChart c = new PieChart(150, 120, 0xeeeeee, 0x000000, 1);

        // Set donut center at (75, 65) and the outer radius to 50 pixels. Inner radius is computed
        // according donutWidth
        c.setDonutSize(75, 60, 50, (int)(50 * donutRadius / 100));

        // Add a title to show the donut width
        c.addTitle("Inner Radius = " + donutRadius + " %", "Arial", 10).setBackground(0xcccccc, 0);

        // Draw the pie in 3D
        c.set3D(12);

        // Set the pie data and the pie labels
        c.setData(data, labels);

        // Disable the sector labels by setting the color to Transparent
        c.setLabelStyle("", 8, Chart.Transparent);

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

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

    //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 donutwidth();

        //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);
        frame.getContentPane().setLayout(new FlowLayout(FlowLayout.LEFT));
        frame.setSize(800, 450);

        // Create the charts and put them in the content pane
        for (int i = 0; i < demo.getNoOfCharts(); ++i)
        {
            ChartViewer viewer = new ChartViewer();
            demo.createChart(viewer, i);
            frame.getContentPane().add(viewer);
        }

        // Display the window
        frame.setVisible(true);
    }
}