ChartDirector 6.1 (Java Edition)

Custom Scatter Symbols




This example demonstrates using external image files as scatter symbols.

The chart in this example is created as 5 scatter layers using XYChart.addScatterLayer, with each layer containing one point.

The symbols for the scatter layers come from external image files. They are loaded using DataSet.setDataSymbol2.

Source Code Listing

[JSP Version] jspdemo/scattersymbols.jsp
<%@page import="ChartDirector.*" %>
<%
// The XY points for the scatter chart
double[] dataX = {200, 400, 300, 250, 500};
double[] dataY = {40, 100, 50, 150, 250};

// The custom symbols for the points
String[] symbols = {"robot1.png", "robot2.png", "robot3.png", "robot4.png", "robot5.png"};

// Create a XYChart object of size 450 x 400 pixels
XYChart c = new XYChart(450, 400);

//Set search path to current JSP directory for loading icon images
c.setSearchPath(getServletConfig().getServletContext(), request);

// Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border (0xc0c0c0).
// Turn on both horizontal and vertical grid lines with light grey color (0xc0c0c0)
c.setPlotArea(55, 40, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1);

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

// Add a title to the y axis using 12pt Arial Bold Italic font
c.yAxis().setTitle("Speed (km/s)", "Arial Bold Italic", 12);

// Add a title to the y axis using 12pt Arial Bold Italic font
c.xAxis().setTitle("Range (km)", "Arial Bold Italic", 12);

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

// Add each point of the data as a separate scatter layer, so that they can have a different symbol
for (int i = 0; i < dataX.length; ++i) {
    c.addScatterLayer(new double[]{dataX[i]}, new double[]{dataY[i]}).getDataSet(0).setDataSymbol2(
        symbols[i]);
}

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

// Include tool tip for the chart
String imageMap1 = c.getHTMLImageMap("", "", "title='Range = {x} km, Speed = {value} km/s'");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Custom Scatter Symbols
</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/scattersymbols.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class scattersymbols implements DemoModule
{
    //Name of demo program
    public String toString() { return "Custom Scatter Symbols"; }

    //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 points for the scatter chart
        double[] dataX = {200, 400, 300, 250, 500};
        double[] dataY = {40, 100, 50, 150, 250};

        // The custom symbols for the points
        String[] symbols = {"robot1.png", "robot2.png", "robot3.png", "robot4.png", "robot5.png"};

        // Create a XYChart object of size 450 x 400 pixels
        XYChart c = new XYChart(450, 400);

        // Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border
        // (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
        // (0xc0c0c0)
        c.setPlotArea(55, 40, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1);

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

        // Add a title to the y axis using 12pt Arial Bold Italic font
        c.yAxis().setTitle("Speed (km/s)", "Arial Bold Italic", 12);

        // Add a title to the y axis using 12pt Arial Bold Italic font
        c.xAxis().setTitle("Range (km)", "Arial Bold Italic", 12);

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

        // Add each point of the data as a separate scatter layer, so that they can have a different
        // symbol
        for (int i = 0; i < dataX.length; ++i) {
            c.addScatterLayer(new double[]{dataX[i]}, new double[]{dataY[i]}).getDataSet(0
                ).setDataSymbol2(symbols[i]);
        }

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

        //include tool tip for the chart
        viewer.setImageMap(c.getHTMLImageMap("clickable", "",
            "title='Range = {x} km, Speed = {value} km/s'"));
    }

    //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 scattersymbols();

        //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);
    }
}