ChartDirector 5.1 (Java Edition)

Scattered Data Contour Chart




This example demonstrates using scattered data for the contour layer.

In previous contour chart examples, the data are gridded, which means the data points lie on a rectangular grid.

ChartDirector also supports scattered data points, which means the data points can be at arbitrary positions. In this example, in additional to a contour layer added using XYChart.addContourLayer, there is also a scatter layer added using XYChart.addScatterLayer to show the positions of the data points.

Source Code Listing

[JSP Version] jspdemo/scattercontour.jsp
<%@page import="ChartDirector.*" %>
<%
// The (x, y, z) coordinates of the scattered data
double[] dataX = {0.5, 1.9, 4.9, 1.0, 8.9, 9.8, 5.9, 2.9, 6.8, 9.0, 0.0, 8.9, 1.9,
    4.8, 2.4, 3.4, 7.9, 7.5, 4.8, 7.5, 9.5, 0.4, 8.9, 0.9, 5.4, 9.4, 2.9, 8.9, 0.9,
    8.9, 10.0, 1.0, 6.8, 3.8, 9.0, 5.3, 6.4, 4.9, 4.5, 2.0, 5.4, 0.0, 10.0, 3.9, 5.4,
    5.9, 5.8, 0.3, 4.4, 8.3};
double[] dataY = {3.3, 3.0, 0.7, 1.0, 9.3, 4.5, 8.4, 0.1, 0.8, 0.1, 9.3, 1.8, 4.3,
    1.3, 2.3, 5.4, 6.9, 9.0, 9.8, 7.5, 1.8, 1.4, 4.5, 7.8, 3.8, 4.0, 2.9, 2.4, 3.9,
    2.9, 2.3, 9.3, 2.0, 3.4, 4.8, 2.3, 3.4, 2.3, 1.5, 7.8, 4.5, 0.9, 6.3, 2.4, 6.9,
    2.8, 1.3, 2.9, 6.4, 6.3};
double[] dataZ = {6.6, 12.5, 7.4, 6.2, 9.6, 13.6, 19.9, 2.2, 6.9, 3.4, 8.7, 8.4, 7.8,
    8.0, 9.4, 11.9, 9.6, 15.7, 12.0, 13.3, 9.6, 6.4, 9.0, 6.9, 4.6, 9.7, 10.6, 9.2,
    7.0, 6.9, 9.7, 8.6, 8.0, 13.6, 13.2, 5.9, 9.0, 3.2, 8.3, 9.7, 8.2, 6.1, 8.7, 5.6,
    14.9, 9.8, 9.3, 5.1, 10.8, 9.8};

// Create a XYChart object of size 450 x 540 pixels
XYChart c = new XYChart(450, 540);

// Add a title to the chart using 15 points Arial Italic font
c.addTitle("      Contour Chart with Scattered Data", "Arial Italic", 15);

// Set the plotarea at (65, 40) and of size 360 x 360 pixels. Use semi-transparent
// black (c0000000) for both horizontal and vertical grid lines
c.setPlotArea(65, 40, 360, 360, -1, -1, -1, 0xc0000000, -1);

// Set x-axis and y-axis title using 12 points Arial Bold Italic font
c.xAxis().setTitle("X-Axis Title Place Holder", "Arial Bold Italic", 10);
c.yAxis().setTitle("Y-Axis Title Place Holder", "Arial Bold Italic", 10);

// Set x-axis and y-axis labels to use Arial Bold font
c.xAxis().setLabelStyle("Arial Bold");
c.yAxis().setLabelStyle("Arial Bold");

// When x-axis and y-axis color to transparent
c.xAxis().setColors(Chart.Transparent);
c.yAxis().setColors(Chart.Transparent);

// Add a scatter layer to the chart to show the position of the data points
c.addScatterLayer(dataX, dataY, "", Chart.Cross2Shape(0.2), 7, 0x000000);

// Add a contour layer using the given data
ContourLayer layer = c.addContourLayer(dataX, dataY, dataZ);

// Move the grid lines in front of the contour layer
c.getPlotArea().moveGridBefore(layer);

// Add a color axis (the legend) in which the top center is anchored at (245, 455).
// Set the length to 330 pixels and the labels on the top side.
ColorAxis cAxis = layer.setColorAxis(245, 455, Chart.TopCenter, 330, Chart.Top);

// Add a bounding box to the color axis using the default line color as border.
cAxis.setBoundingBox(Chart.Transparent, Chart.LineColor);

// Add a title to the color axis using 12 points Arial Bold Italic font
cAxis.setTitle("Color Legend Title Place Holder", "Arial Bold Italic", 10);

// Set color axis labels to use Arial Bold font
cAxis.setLabelStyle("Arial Bold");

// Set the color axis range as 0 to 20, with a step every 2 units
cAxis.setLinearScale(0, 20, 2);

// Output the chart
String chart1URL = c.makeSession(request, "chart1");
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Scattered Data Contour 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)%>'>
</body>
</html>

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

public class scattercontour implements DemoModule
{
    //Name of demo program
    public String toString() { return "Scattered Data Contour Chart"; }

    //Number of charts produced in this demo
    public int getNoOfCharts() { return 1; }

    //Main code for creating charts
    public void createChart(ChartViewer viewer, int index)
    {
        // The (x, y, z) coordinates of the scattered data
        double[] dataX = {0.5, 1.9, 4.9, 1.0, 8.9, 9.8, 5.9, 2.9, 6.8, 9.0, 0.0, 8.9,
            1.9, 4.8, 2.4, 3.4, 7.9, 7.5, 4.8, 7.5, 9.5, 0.4, 8.9, 0.9, 5.4, 9.4,
            2.9, 8.9, 0.9, 8.9, 10.0, 1.0, 6.8, 3.8, 9.0, 5.3, 6.4, 4.9, 4.5, 2.0,
            5.4, 0.0, 10.0, 3.9, 5.4, 5.9, 5.8, 0.3, 4.4, 8.3};
        double[] dataY = {3.3, 3.0, 0.7, 1.0, 9.3, 4.5, 8.4, 0.1, 0.8, 0.1, 9.3, 1.8,
            4.3, 1.3, 2.3, 5.4, 6.9, 9.0, 9.8, 7.5, 1.8, 1.4, 4.5, 7.8, 3.8, 4.0,
            2.9, 2.4, 3.9, 2.9, 2.3, 9.3, 2.0, 3.4, 4.8, 2.3, 3.4, 2.3, 1.5, 7.8,
            4.5, 0.9, 6.3, 2.4, 6.9, 2.8, 1.3, 2.9, 6.4, 6.3};
        double[] dataZ = {6.6, 12.5, 7.4, 6.2, 9.6, 13.6, 19.9, 2.2, 6.9, 3.4, 8.7,
            8.4, 7.8, 8.0, 9.4, 11.9, 9.6, 15.7, 12.0, 13.3, 9.6, 6.4, 9.0, 6.9, 4.6,
            9.7, 10.6, 9.2, 7.0, 6.9, 9.7, 8.6, 8.0, 13.6, 13.2, 5.9, 9.0, 3.2, 8.3,
            9.7, 8.2, 6.1, 8.7, 5.6, 14.9, 9.8, 9.3, 5.1, 10.8, 9.8};

        // Create a XYChart object of size 450 x 540 pixels
        XYChart c = new XYChart(450, 540);

        // Add a title to the chart using 15 points Arial Italic font
        c.addTitle("      Contour Chart with Scattered Data", "Arial Italic", 15);

        // Set the plotarea at (65, 40) and of size 360 x 360 pixels. Use
        // semi-transparent black (c0000000) for both horizontal and vertical grid
        // lines
        c.setPlotArea(65, 40, 360, 360, -1, -1, -1, 0xc0000000, -1);

        // Set x-axis and y-axis title using 12 points Arial Bold Italic font
        c.xAxis().setTitle("X-Axis Title Place Holder", "Arial Bold Italic", 10);
        c.yAxis().setTitle("Y-Axis Title Place Holder", "Arial Bold Italic", 10);

        // Set x-axis and y-axis labels to use Arial Bold font
        c.xAxis().setLabelStyle("Arial Bold");
        c.yAxis().setLabelStyle("Arial Bold");

        // When x-axis and y-axis color to transparent
        c.xAxis().setColors(Chart.Transparent);
        c.yAxis().setColors(Chart.Transparent);

        // Add a scatter layer to the chart to show the position of the data points
        c.addScatterLayer(dataX, dataY, "", Chart.Cross2Shape(0.2), 7, 0x000000);

        // Add a contour layer using the given data
        ContourLayer layer = c.addContourLayer(dataX, dataY, dataZ);

        // Move the grid lines in front of the contour layer
        c.getPlotArea().moveGridBefore(layer);

        // Add a color axis (the legend) in which the top center is anchored at (245,
        // 455). Set the length to 330 pixels and the labels on the top side.
        ColorAxis cAxis = layer.setColorAxis(245, 455, Chart.TopCenter, 330,
            Chart.Top);

        // Add a bounding box to the color axis using the default line color as
        // border.
        cAxis.setBoundingBox(Chart.Transparent, Chart.LineColor);

        // Add a title to the color axis using 12 points Arial Bold Italic font
        cAxis.setTitle("Color Legend Title Place Holder", "Arial Bold Italic", 10);

        // Set color axis labels to use Arial Bold font
        cAxis.setLabelStyle("Arial Bold");

        // Set the color axis range as 0 to 20, with a step every 2 units
        cAxis.setLinearScale(0, 20, 2);

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

    //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 scattercontour();

        //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);
    }
}