ChartDirector 6.1 (Java Edition)

Color Vertical Linear Meters


          

This example demonstrates horizontal linear meters in various colors, with different color scales, and with title and value readout.

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

The title and value readout are created as TextBox objects using BaseChart.addTitle and BaseChart.addTitle2, with the text box background set to the same color as that of the chart border.

Source Code Listing

[JSP Version] jspdemo/colorvlinearmeter.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 = 74.25;

    // The background and border colors of the meters
    int[] bgColor = {0xbbddff, 0xccffcc, 0xffccff, 0xffffaa, 0xffdddd, 0xeeeeee};
    int[] borderColor = {0x000088, 0x006600, 0x6600aa, 0xee6600, 0x880000, 0x666666};

    // Create a LinearMeter object of size 70 x 260 pixels with a 3-pixel thick rounded frame
    LinearMeter m = new LinearMeter(70, 260, bgColor[chartIndex], borderColor[chartIndex]);
    m.setRoundedFrame(Chart.Transparent);
    m.setThickFrame(3);

    // Set the scale region top-left corner at (28, 30), with size of 20 x 200 pixels. The scale
    // labels are located on the left (default - implies vertical meter)
    m.setMeter(28, 30, 20, 200);

    // Set meter scale from 0 - 100, with a tick every 10 units
    m.setScale(0, 100, 10);

    // Demostrate different types of color scales and putting them at different positions
    double[] smoothColorScale = {0, 0x6666ff, 25, 0x00bbbb, 50, 0x00ff00, 75, 0xffff00, 100,
        0xff0000};
    double[] stepColorScale = {0, 0x33ff33, 50, 0xffff33, 80, 0xff3333, 100};
    double[] highLowColorScale = {0, 0x6666ff, 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 step color scale at the default position
        m.addColorScale(stepColorScale);
    } else if (chartIndex == 2) {
        // Add the high low scale at the default position
        m.addColorScale(highLowColorScale);
    } else if (chartIndex == 3) {
        // Add the smooth color scale starting at x = 28 (left of scale) with zero width and ending
        // at x = 28 with 20 pixels width
        m.addColorScale(smoothColorScale, 28, 0, 28, 20);
    } else if (chartIndex == 4) {
        // Add the smooth color scale starting at x = 38 (center of scale) with zero width and
        // ending at x = 28 with 20 pixels width
        m.addColorScale(smoothColorScale, 38, 0, 28, 20);
    } else {
        // Add the smooth color scale starting at x = 48 (right of scale) with zero width and ending
        // at x = 28 with 20 pixels width
        m.addColorScale(smoothColorScale, 48, 0, 28, 20);
    }

    // Add a blue (0x0000cc) pointer at the specified value
    m.addPointer(value, 0x0000cc);

    // Add a title using white (0xffffff) 8pt Arial Bold font with a border color background
    m.addTitle("Temp C", "Arial Bold", 8, 0xffffff).setBackground(borderColor[chartIndex]);

    // Add a bottom title using white (0xffffff) 8pt Arial Bold font with a border color background
    // to display the value
    m.addTitle2(Chart.Bottom, m.formatValue(value, "2"), "Arial Bold", 8, 0xffffff).setBackground(
        borderColor[chartIndex]);

    // 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 Vertical Linear 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/colorvlinearmeter.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class colorvlinearmeter implements DemoModule
{
    //Name of demo program
    public String toString() { return "Color Vertical Linear 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 = 74.25;

        // The background and border colors of the meters
        int[] bgColor = {0xbbddff, 0xccffcc, 0xffccff, 0xffffaa, 0xffdddd, 0xeeeeee};
        int[] borderColor = {0x000088, 0x006600, 0x6600aa, 0xee6600, 0x880000, 0x666666};

        // Create a LinearMeter object of size 70 x 260 pixels with a 3-pixel thick rounded frame
        LinearMeter m = new LinearMeter(70, 260, bgColor[chartIndex], borderColor[chartIndex]);
        m.setRoundedFrame(Chart.Transparent);
        m.setThickFrame(3);

        // Set the scale region top-left corner at (28, 30), with size of 20 x 200 pixels. The scale
        // labels are located on the left (default - implies vertical meter)
        m.setMeter(28, 30, 20, 200);

        // Set meter scale from 0 - 100, with a tick every 10 units
        m.setScale(0, 100, 10);

        // Demostrate different types of color scales and putting them at different positions
        double[] smoothColorScale = {0, 0x6666ff, 25, 0x00bbbb, 50, 0x00ff00, 75, 0xffff00, 100,
            0xff0000};
        double[] stepColorScale = {0, 0x33ff33, 50, 0xffff33, 80, 0xff3333, 100};
        double[] highLowColorScale = {0, 0x6666ff, 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 step color scale at the default position
            m.addColorScale(stepColorScale);
        } else if (chartIndex == 2) {
            // Add the high low scale at the default position
            m.addColorScale(highLowColorScale);
        } else if (chartIndex == 3) {
            // Add the smooth color scale starting at x = 28 (left of scale) with zero width and
            // ending at x = 28 with 20 pixels width
            m.addColorScale(smoothColorScale, 28, 0, 28, 20);
        } else if (chartIndex == 4) {
            // Add the smooth color scale starting at x = 38 (center of scale) with zero width and
            // ending at x = 28 with 20 pixels width
            m.addColorScale(smoothColorScale, 38, 0, 28, 20);
        } else {
            // Add the smooth color scale starting at x = 48 (right of scale) with zero width and
            // ending at x = 28 with 20 pixels width
            m.addColorScale(smoothColorScale, 48, 0, 28, 20);
        }

        // Add a blue (0x0000cc) pointer at the specified value
        m.addPointer(value, 0x0000cc);

        // Add a title using white (0xffffff) 8pt Arial Bold font with a border color background
        m.addTitle("Temp C", "Arial Bold", 8, 0xffffff).setBackground(borderColor[chartIndex]);

        // Add a bottom title using white (0xffffff) 8pt Arial Bold font with a border color
        // background to display the value
        m.addTitle2(Chart.Bottom, m.formatValue(value, "2"), "Arial Bold", 8, 0xffffff
            ).setBackground(borderColor[chartIndex]);

        // 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 colorvlinearmeter();

        //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);
    }
}