ChartDirector 6.1 (Java Edition)

Scattered Data Contour Chart




This example demonstrates using scattered data to create a ContourLayer.

In the previous Contour Chart example, the data points lie on a grid. ChartDirector also supports using scattered data points, which means the data points can be at irregular positions. To distinguish between the two case, if the number of z coordinates is equal to the product of the number of x and y coordinates, ChartDirector will assume the x and y coordinates define the grid and the z coordinates are values of the points on the grid. If the number of x, y and z coordinates are equal, ChartDirector will assume they represent scatter points.

In this example, in additional to a ContourLayer added using XYChart.addContourLayer, there is also a ScatterLayer 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 chartIndex)
    {
        // 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);
    }
}