ChartDirector 6.1 (Java Edition)

Black Semicircle Meters


          

This example demonstrates semicircle meters with black background, silver border and glare effect.

The silver border effect is achieved by using AngularMeter.relativeLinearGradient to create a gradient consisting of varying levels of grey.

Glare effect is added to some of the meters using AngularMeter.addGlare. Glare effect works best in a dark background.

Source Code Listing

[JSP Version] jspdemo/blacksemicirclemeter.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 300 x 180 pixels with transparent background
    AngularMeter m = new AngularMeter(300, 180, Chart.Transparent);

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

    // Center at (150, 150), scale radius = 128 pixels, scale angle -90 to +90 degrees
    m.setMeter(150, 150, 128, -90, 90);

    // Gradient color for the border to make it silver-like
    double[] ringGradient = {1, 0x909090, 0.5, 0xd6d6d6, 0, 0xeeeeee, -0.5, 0xd6d6d6, -1, 0x909090};

    // Add a black (0x000000) scale background of 148 pixels radius with a 10 pixel thick silver
    // border
    m.addScaleBackground(148, 0, 10, m.relativeLinearGradient(ringGradient, 45, 148));

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

    // Set the scale label style to 15pt 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", 16);
    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, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100,
        0xff0000};
    double[] stepColorScale = {0, 0x00aa00, 60, 0xddaa00, 80, 0xcc0000, 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 (150, 125) with 15pt Arial Italic font
    m.addText(150, 125, "CPU", "Arial Italic", 15, Chart.TextColor, Chart.BottomCenter);

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

    // Add glare up to radius 138 (= region inside border)
    if (chartIndex % 2 == 0) {
        m.addGlare(138);
    }

    // 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">
    Black Semicircle 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/blacksemicirclemeter.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class blacksemicirclemeter implements DemoModule
{
    //Name of demo program
    public String toString() { return "Black Semicircle 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 300 x 180 pixels with transparent background
        AngularMeter m = new AngularMeter(300, 180, Chart.Transparent);

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

        // Center at (150, 150), scale radius = 128 pixels, scale angle -90 to +90 degrees
        m.setMeter(150, 150, 128, -90, 90);

        // Gradient color for the border to make it silver-like
        double[] ringGradient = {1, 0x909090, 0.5, 0xd6d6d6, 0, 0xeeeeee, -0.5, 0xd6d6d6, -1,
            0x909090};

        // Add a black (0x000000) scale background of 148 pixels radius with a 10 pixel thick silver
        // border
        m.addScaleBackground(148, 0, 10, m.relativeLinearGradient(ringGradient, 45, 148));

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

        // Set the scale label style to 15pt 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", 16);
        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, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100,
            0xff0000};
        double[] stepColorScale = {0, 0x00aa00, 60, 0xddaa00, 80, 0xcc0000, 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 (150, 125) with 15pt Arial Italic font
        m.addText(150, 125, "CPU", "Arial Italic", 15, Chart.TextColor, Chart.BottomCenter);

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

        // Add glare up to radius 138 (= region inside border)
        if (chartIndex % 2 == 0) {
            m.addGlare(138);
        }

        // 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 blacksemicirclemeter();

        //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);
    }
}