ChartDirector 6.1 (Java Edition)

Rectangular Angular Meters


          

This example demonstrates rectangular angular meters.

The angular span of the meter scale in this example is from -60 to 60 degrees, which is one third of a circle. The meter is configured to have a rectangular frame with rounded corners. A semi-transparent rectangle is put at the bottom of the meter to create the object that covers the meter cap. The rectangle is created by using BaseChart.addText to create an empty text box, and then use Box.setSize and Box.setBackground to configure it to have the proper size and color.

Source Code Listing

[JSP Version] jspdemo/rectangularmeter.jsp
<%@page import="ChartDirector.*" %>
<%@page import="javax.servlet.http.*" %>
<%!
// Function to create the demo charts
String createChart(HttpServletRequest request, int chartIndex)
{
    // The value to display on the meter
    double value = 72.55;

    // Create an AngularMeter object of size 240 x 170 pixels with very light grey (0xeeeeee)
    // background, and a rounded 4-pixel thick light grey (0xcccccc) border
    AngularMeter m = new AngularMeter(240, 170, 0xeeeeee, 0xcccccc);
    m.setRoundedFrame(Chart.Transparent);
    m.setThickFrame(4);

    // Set the default text and line colors to dark grey (0x222222)
    m.setColor(Chart.TextColor, 0x222222);
    m.setColor(Chart.LineColor, 0x222222);

    // Center at (120, 145), scale radius = 128 pixels, scale angle -60 to +60 degrees
    m.setMeter(120, 145, 128, -60, 60);

    // Meter scale is 0 - 100, with major/minor/micro ticks every 20/10/5 units
    m.setScale(0, 100, 20, 10, 5);

    // Set the scale label style to 14pt Arial Italic. Set the major/minor/micro tick lengths to
    // 16/16/10 pixels pointing inwards, and their widths to 2/1/1 pixels.
    m.setLabelStyle("Arial Italic", 14);
    m.setTickLength(-16, -16, -10);
    m.setLineWidth(0, 2, 1, 1);

    // Demostrate different types of color scales and putting them at different positions
    double[] smoothColorScale = {0, 0x3333ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100,
        0xff0000};
    double[] stepColorScale = {0, 0x00cc00, 60, 0xffdd00, 80, 0xee0000, 100};
    double[] highLowColorScale = {0, 0x00ff00, 70, Chart.Transparent, 100, 0xff0000};

    if (chartIndex == 0) {
        // Add the smooth color scale at the default position
        m.addColorScale(smoothColorScale);
    } else if (chartIndex == 1) {
        // Add the smooth color scale starting at radius 128 with zero width and ending at radius
        // 128 with 16 pixels inner width
        m.addColorScale(smoothColorScale, 128, 0, 128, -16);
    } else if (chartIndex == 2) {
        // Add the smooth color scale starting at radius 70 with zero width and ending at radius 60
        // with 20 pixels outer width
        m.addColorScale(smoothColorScale, 70, 0, 60, 20);
    } else if (chartIndex == 3) {
        // Add the high/low color scale at the default position
        m.addColorScale(highLowColorScale);
    } else if (chartIndex == 4) {
        // Add the step color scale at the default position
        m.addColorScale(stepColorScale);
    } else {
        // Add the smooth color scale at radius 60 with 15 pixels outer width
        m.addColorScale(smoothColorScale, 60, 15);
    }

    // Add a text label centered at (120, 120) with 15pt Arial Italic font
    m.addText(120, 120, "CPU", "Arial Italic", 15, Chart.TextColor, Chart.BottomCenter);

    // Add a red (0xff0000) pointer at the specified value
    m.addPointer2(value, 0xff0000);

    // Add a semi-transparent light grey (0x3fcccccc) rectangle at (0, 120) and of size 240 x 60
    // pixels to cover the bottom part of the meter for decoration
    TextBox cover = m.addText(0, 120, "");
    cover.setSize(240, 60);
    cover.setBackground(0x3fcccccc);

    // Output the chart
    return m.makeSession(request, "chart" + chartIndex);
}
%>
<%
String chart0URL = createChart(request, 0);
String chart1URL = createChart(request, 1);
String chart2URL = createChart(request, 2);
String chart3URL = createChart(request, 3);
String chart4URL = createChart(request, 4);
String chart5URL = createChart(request, 5);
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Rectangular Angular Meters
</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?"+chart0URL)%>'>
<img src='<%=response.encodeURL("getchart.jsp?"+chart1URL)%>'>
<img src='<%=response.encodeURL("getchart.jsp?"+chart2URL)%>'>
<img src='<%=response.encodeURL("getchart.jsp?"+chart3URL)%>'>
<img src='<%=response.encodeURL("getchart.jsp?"+chart4URL)%>'>
<img src='<%=response.encodeURL("getchart.jsp?"+chart5URL)%>'>
</body>
</html>

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

public class rectangularmeter implements DemoModule
{
    //Name of demo program
    public String toString() { return "Rectangular Angular Meters"; }

    //Number of charts produced in this demo
    public int getNoOfCharts() { return 6; }

    //Main code for creating charts
    public void createChart(ChartViewer viewer, int chartIndex)
    {
        // The value to display on the meter
        double value = 72.55;

        // Create an AngularMeter object of size 240 x 170 pixels with very light grey (0xeeeeee)
        // background, and a rounded 4-pixel thick light grey (0xcccccc) border
        AngularMeter m = new AngularMeter(240, 170, 0xeeeeee, 0xcccccc);
        m.setRoundedFrame(Chart.Transparent);
        m.setThickFrame(4);

        // Set the default text and line colors to dark grey (0x222222)
        m.setColor(Chart.TextColor, 0x222222);
        m.setColor(Chart.LineColor, 0x222222);

        // Center at (120, 145), scale radius = 128 pixels, scale angle -60 to +60 degrees
        m.setMeter(120, 145, 128, -60, 60);

        // Meter scale is 0 - 100, with major/minor/micro ticks every 20/10/5 units
        m.setScale(0, 100, 20, 10, 5);

        // Set the scale label style to 14pt Arial Italic. Set the major/minor/micro tick lengths to
        // 16/16/10 pixels pointing inwards, and their widths to 2/1/1 pixels.
        m.setLabelStyle("Arial Italic", 14);
        m.setTickLength(-16, -16, -10);
        m.setLineWidth(0, 2, 1, 1);

        // Demostrate different types of color scales and putting them at different positions
        double[] smoothColorScale = {0, 0x3333ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100,
            0xff0000};
        double[] stepColorScale = {0, 0x00cc00, 60, 0xffdd00, 80, 0xee0000, 100};
        double[] highLowColorScale = {0, 0x00ff00, 70, Chart.Transparent, 100, 0xff0000};

        if (chartIndex == 0) {
            // Add the smooth color scale at the default position
            m.addColorScale(smoothColorScale);
        } else if (chartIndex == 1) {
            // Add the smooth color scale starting at radius 128 with zero width and ending at
            // radius 128 with 16 pixels inner width
            m.addColorScale(smoothColorScale, 128, 0, 128, -16);
        } else if (chartIndex == 2) {
            // Add the smooth color scale starting at radius 70 with zero width and ending at radius
            // 60 with 20 pixels outer width
            m.addColorScale(smoothColorScale, 70, 0, 60, 20);
        } else if (chartIndex == 3) {
            // Add the high/low color scale at the default position
            m.addColorScale(highLowColorScale);
        } else if (chartIndex == 4) {
            // Add the step color scale at the default position
            m.addColorScale(stepColorScale);
        } else {
            // Add the smooth color scale at radius 60 with 15 pixels outer width
            m.addColorScale(smoothColorScale, 60, 15);
        }

        // Add a text label centered at (120, 120) with 15pt Arial Italic font
        m.addText(120, 120, "CPU", "Arial Italic", 15, Chart.TextColor, Chart.BottomCenter);

        // Add a red (0xff0000) pointer at the specified value
        m.addPointer2(value, 0xff0000);

        // Add a semi-transparent light grey (0x3fcccccc) rectangle at (0, 120) and of size 240 x 60
        // pixels to cover the bottom part of the meter for decoration
        TextBox cover = m.addText(0, 120, "");
        cover.setSize(240, 60);
        cover.setBackground(0x3fcccccc);

        // 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 rectangularmeter();

        //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);
    }
}