ChartDirector 6.1 (Java Edition)

Linear Zone Meter




This example demonstrates a linear meter labelled with zones.

The meter in this example is achieved by using LinearMeter.addZone to add labelled zones. The black lines separating the zones are added by using BaseMeter.addLabel with empty spaces as labels.

Source Code Listing

[JSP Version] jspdemo/linearzonemeter.jsp
<%@page import="ChartDirector.*" %>
<%
// The value to display on the meter
double value = 85;

// Create an LinearMeter object of size 210 x 45 pixels, using silver background with a 2 pixel
// black 3D depressed border.
LinearMeter m = new LinearMeter(210, 45, Chart.silverColor(), 0, -2);

// Set the scale region top-left corner at (5, 5), with size of 200 x 20 pixels. The scale labels
// are located on the bottom (implies horizontal meter)
m.setMeter(5, 5, 200, 20, Chart.Bottom);

// Set meter scale from 0 - 100
m.setScale(0, 100);

// Add a title at the bottom of the meter with a 1 pixel raised 3D border
m.addTitle2(Chart.Bottom, "Battery Level", "Arial Bold", 8).setBackground(Chart.Transparent, -1, 1);

// Set 3 zones of different colors to represent Good/Weak/Bad data ranges
m.addZone(50, 100, 0x99ff99, "Good");
m.addZone(20, 50, 0xffff66, "Weak");
m.addZone(0, 20, 0xffcccc, "Bad");

// Add empty labels (just need the ticks) at 0/20/50/80 as separators for zones
m.addLabel(0, " ");
m.addLabel(20, " ");
m.addLabel(50, " ");
m.addLabel(100, " ");

// Add a semi-transparent blue (800000ff) pointer at the specified value, using triangular pointer
// shape
m.addPointer(value, 0x800000ff).setShape(Chart.TriangularPointer);

// Output the chart
String chart1URL = m.makeSession(request, "chart1");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Linear Zone Meter
</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/linearzonemeter.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class linearzonemeter implements DemoModule
{
    //Name of demo program
    public String toString() { return "Linear Zone Meter"; }

    //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 value to display on the meter
        double value = 85;

        // Create an LinearMeter object of size 210 x 45 pixels, using silver background with a 2
        // pixel black 3D depressed border.
        LinearMeter m = new LinearMeter(210, 45, Chart.silverColor(), 0, -2);

        // Set the scale region top-left corner at (5, 5), with size of 200 x 20 pixels. The scale
        // labels are located on the bottom (implies horizontal meter)
        m.setMeter(5, 5, 200, 20, Chart.Bottom);

        // Set meter scale from 0 - 100
        m.setScale(0, 100);

        // Add a title at the bottom of the meter with a 1 pixel raised 3D border
        m.addTitle2(Chart.Bottom, "Battery Level", "Arial Bold", 8).setBackground(Chart.Transparent,
            -1, 1);

        // Set 3 zones of different colors to represent Good/Weak/Bad data ranges
        m.addZone(50, 100, 0x99ff99, "Good");
        m.addZone(20, 50, 0xffff66, "Weak");
        m.addZone(0, 20, 0xffcccc, "Bad");

        // Add empty labels (just need the ticks) at 0/20/50/80 as separators for zones
        m.addLabel(0, " ");
        m.addLabel(20, " ");
        m.addLabel(50, " ");
        m.addLabel(100, " ");

        // Add a semi-transparent blue (800000ff) pointer at the specified value, using triangular
        // pointer shape
        m.addPointer(value, 0x800000ff).setShape(Chart.TriangularPointer);

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

    //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 linearzonemeter();

        //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);
    }
}