ChartDirector 6.1 (Java Edition)

Scatter Trend Chart




This example demonstrates linear regression trend line fitting together with scatter layers.

The chart in this example has 4 layers - 2 scatter layers created using XYChart.addScatterLayer to show the data points, and two trend layers created using XYChart.addTrendLayer2 for the two trend lines.

Source Code Listing

[JSP Version] jspdemo/scattertrend.jsp
<%@page import="ChartDirector.*" %>
<%
// The XY data of the first data series
double[] dataX0 = {50, 55, 37, 24, 42, 49, 63, 72, 83, 59};
double[] dataY0 = {3.6, 2.8, 2.5, 2.3, 3.8, 3.0, 3.8, 5.0, 6.0, 3.3};

// The XY data of the second data series
double[] dataX1 = {50, 55, 37, 24, 42, 49, 63, 72, 83, 59};
double[] dataY1 = {1.6, 1.8, 0.8, 0.5, 1.3, 1.5, 2.3, 2.4, 2.9, 1.5};

// Tool tip formats for data points and trend lines
String scatterToolTip = "title='{dataSetName}: Response time at {x} TPS: {value} sec'";
String trendToolTip = "title='Slope = {slope|4} sec/TPS; Intercept = {intercept|4} sec'";

// Create a XYChart object of size 450 x 420 pixels
XYChart c = new XYChart(450, 420);

// Set the plotarea at (55, 65) and of size 350 x 300 pixels, with white background and a light grey
// border (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
// (0xc0c0c0)
c.setPlotArea(55, 65, 350, 300, 0xffffff, -1, 0xc0c0c0, 0xc0c0c0, -1);

// Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12pt Times Bold
// Italic font. Set the background and border color to Transparent.
c.addLegend(50, 30, false, "Times New Roman Bold Italic", 12).setBackground(Chart.Transparent);

// Add a title to the chart using 18 point Times Bold Itatic font.
c.addTitle("Server Performance", "Times New Roman Bold Italic", 18);

// Add titles to the axes using 12pt Arial Bold Italic font
c.yAxis().setTitle("Response Time (sec)", "Arial Bold Italic", 12);
c.xAxis().setTitle("Server Load (TPS)", "Arial Bold Italic", 12);

// Set the axes line width to 3 pixels
c.yAxis().setWidth(3);
c.xAxis().setWidth(3);

// Add a scatter layer using (dataX0, dataY0)
ScatterLayer scatter1 = c.addScatterLayer(dataX0, dataY0, "Server AAA", Chart.DiamondSymbol, 11,
    0x008000);
scatter1.setHTMLImageMap("", "", scatterToolTip);

// Add a trend line layer for (dataX0, dataY0)
TrendLayer trend1 = c.addTrendLayer2(dataX0, dataY0, 0x008000);
trend1.setLineWidth(3);
trend1.setHTMLImageMap("", "", trendToolTip);

// Add a scatter layer for (dataX1, dataY1)
ScatterLayer scatter2 = c.addScatterLayer(dataX1, dataY1, "Server BBB", Chart.TriangleSymbol, 9,
    0x6666ff);
scatter2.setHTMLImageMap("", "", scatterToolTip);

// Add a trend line layer for (dataX1, dataY1)
TrendLayer trend2 = c.addTrendLayer2(dataX1, dataY1, 0x6666ff);
trend2.setLineWidth(3);
trend2.setHTMLImageMap("", "", trendToolTip);

// Output the chart
String chart1URL = c.makeSession(request, "chart1");

// include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Scatter Trend Chart
</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)%>'
    usemap="#map1" border="0">
<map name="map1"><%=imageMap1%></map>
</body>
</html>

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

public class scattertrend implements DemoModule
{
    //Name of demo program
    public String toString() { return "Scatter Trend Chart"; }

    //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 XY data of the first data series
        double[] dataX0 = {50, 55, 37, 24, 42, 49, 63, 72, 83, 59};
        double[] dataY0 = {3.6, 2.8, 2.5, 2.3, 3.8, 3.0, 3.8, 5.0, 6.0, 3.3};

        // The XY data of the second data series
        double[] dataX1 = {50, 55, 37, 24, 42, 49, 63, 72, 83, 59};
        double[] dataY1 = {1.6, 1.8, 0.8, 0.5, 1.3, 1.5, 2.3, 2.4, 2.9, 1.5};

        // Tool tip formats for data points and trend lines
        String scatterToolTip = "title='{dataSetName}: Response time at {x} TPS: {value} sec'";
        String trendToolTip = "title='Slope = {slope|4} sec/TPS; Intercept = {intercept|4} sec'";

        // Create a XYChart object of size 450 x 420 pixels
        XYChart c = new XYChart(450, 420);

        // Set the plotarea at (55, 65) and of size 350 x 300 pixels, with white background and a
        // light grey border (0xc0c0c0). Turn on both horizontal and vertical grid lines with light
        // grey color (0xc0c0c0)
        c.setPlotArea(55, 65, 350, 300, 0xffffff, -1, 0xc0c0c0, 0xc0c0c0, -1);

        // Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12pt Times
        // Bold Italic font. Set the background and border color to Transparent.
        c.addLegend(50, 30, false, "Times New Roman Bold Italic", 12).setBackground(
            Chart.Transparent);

        // Add a title to the chart using 18 point Times Bold Itatic font.
        c.addTitle("Server Performance", "Times New Roman Bold Italic", 18);

        // Add titles to the axes using 12pt Arial Bold Italic font
        c.yAxis().setTitle("Response Time (sec)", "Arial Bold Italic", 12);
        c.xAxis().setTitle("Server Load (TPS)", "Arial Bold Italic", 12);

        // Set the axes line width to 3 pixels
        c.yAxis().setWidth(3);
        c.xAxis().setWidth(3);

        // Add a scatter layer using (dataX0, dataY0)
        ScatterLayer scatter1 = c.addScatterLayer(dataX0, dataY0, "Server AAA", Chart.DiamondSymbol,
            11, 0x008000);
        scatter1.setHTMLImageMap("", "", scatterToolTip);

        // Add a trend line layer for (dataX0, dataY0)
        TrendLayer trend1 = c.addTrendLayer2(dataX0, dataY0, 0x008000);
        trend1.setLineWidth(3);
        trend1.setHTMLImageMap("", "", trendToolTip);

        // Add a scatter layer for (dataX1, dataY1)
        ScatterLayer scatter2 = c.addScatterLayer(dataX1, dataY1, "Server BBB",
            Chart.TriangleSymbol, 9, 0x6666ff);
        scatter2.setHTMLImageMap("", "", scatterToolTip);

        // Add a trend line layer for (dataX1, dataY1)
        TrendLayer trend2 = c.addTrendLayer2(dataX1, dataY1, 0x6666ff);
        trend2.setLineWidth(3);
        trend2.setHTMLImageMap("", "", trendToolTip);

        // Output the chart
        viewer.setChart(c);

        // include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable"));
    }

    //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 scattertrend();

        //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);
    }
}