ChartDirector 6.1 (Java Edition)

Color Semicircle Meters


          

This example demonstrates semicircle meters in various gradient colors, as well as various color scales and pointer types.

The background color in this example changes from a specified color at the border, to a brighter version of the color at the center. The brighter color is derived from the specified color using BaseChart.adjustBrightness. To achieve the radial gradient effect, these two colors are passed to AngularMeter.relativeRadialGradient to create a radial gradient color. The gradient color is then passed to AngularMeter.addScaleBackground to fill the background.

BaseMeter.addColorScale is used to create the color scales in this example. The color scales are created by with different colors, different end point positions and different widths at the end points.

Two pointer types are shown in these meters - a sharp very thin triangular pointer, and a line pointer. They are created using AngularMeter.addPointer2 with TriangularPointer2 and LinePointer2 as parameters.

Source Code Listing

[JSP Version] jspdemo/colorsemicirclemeter.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;

    // The background and border colors of the meters
    int[] bgColor = {0x88ccff, 0xffdddd, 0xffddaa, 0xffccff, 0xdddddd, 0xccffcc};
    int[] borderColor = {0x000077, 0x880000, 0xee6600, 0x440088, 0x000000, 0x006000};

    // Create an AngularMeter object of size 300 x 180 pixels with transparent background
    AngularMeter m = new AngularMeter(300, 180, Chart.Transparent);

    // Center at (150, 150), scale radius = 124 pixels, scale angle -90 to +90 degrees
    m.setMeter(150, 150, 124, -90, 90);

    // Background gradient color with brighter color at the center
    double[] bgGradient = {0, m.adjustBrightness(bgColor[chartIndex], 3), 0.75, bgColor[chartIndex]}
        ;

    // Add a scale background of 148 pixels radius using the background gradient, with a 13 pixel
    // thick border
    m.addScaleBackground(148, m.relativeRadialGradient(bgGradient), 13, borderColor[chartIndex]);

    // 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, 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 124 with zero width and ending at radius
        // 124 with 16 pixels inner width
        m.addColorScale(smoothColorScale, 124, 0, 124, -16);
    } else if (chartIndex == 2) {
        // Add the smooth color scale starting at radius 65 with zero width and ending at radius 55
        // with 20 pixels outer width
        m.addColorScale(smoothColorScale, 65, 0, 55, 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 55 with 20 pixels outer width
        m.addColorScale(smoothColorScale, 55, 20);
    }

    // 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);

    // Demonstrate two different types of pointers - thin triangular pointer (the default) and line
    // pointer
    if (chartIndex % 2 == 0) {
        m.addPointer2(value, 0xff0000);
    } else {
        m.addPointer2(value, 0xff0000, -1, Chart.LinePointer2);
    }

    // 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">
    Color 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/colorsemicirclemeter.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class colorsemicirclemeter implements DemoModule
{
    //Name of demo program
    public String toString() { return "Color 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;

        // The background and border colors of the meters
        int[] bgColor = {0x88ccff, 0xffdddd, 0xffddaa, 0xffccff, 0xdddddd, 0xccffcc};
        int[] borderColor = {0x000077, 0x880000, 0xee6600, 0x440088, 0x000000, 0x006000};

        // Create an AngularMeter object of size 300 x 180 pixels with transparent background
        AngularMeter m = new AngularMeter(300, 180, Chart.Transparent);

        // Center at (150, 150), scale radius = 124 pixels, scale angle -90 to +90 degrees
        m.setMeter(150, 150, 124, -90, 90);

        // Background gradient color with brighter color at the center
        double[] bgGradient = {0, m.adjustBrightness(bgColor[chartIndex], 3), 0.75, bgColor[
            chartIndex]};

        // Add a scale background of 148 pixels radius using the background gradient, with a 13
        // pixel thick border
        m.addScaleBackground(148, m.relativeRadialGradient(bgGradient), 13, borderColor[chartIndex])
            ;

        // 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, 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 124 with zero width and ending at
            // radius 124 with 16 pixels inner width
            m.addColorScale(smoothColorScale, 124, 0, 124, -16);
        } else if (chartIndex == 2) {
            // Add the smooth color scale starting at radius 65 with zero width and ending at radius
            // 55 with 20 pixels outer width
            m.addColorScale(smoothColorScale, 65, 0, 55, 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 55 with 20 pixels outer width
            m.addColorScale(smoothColorScale, 55, 20);
        }

        // 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);

        // Demonstrate two different types of pointers - thin triangular pointer (the default) and
        // line pointer
        if (chartIndex % 2 == 0) {
            m.addPointer2(value, 0xff0000);
        } else {
            m.addPointer2(value, 0xff0000, -1, Chart.LinePointer2);
        }

        // 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 colorsemicirclemeter();

        //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);
    }
}