ChartDirector 6.1 (Java Edition)

Surface Chart (2)




This example extends the Surface Chart (1) example by adding surface grid and contour lines, and using alternative view angles and continuous coloring.

Source Code Listing

[JSP Version] jspdemo/surface2.jsp
<%@page import="ChartDirector.*" %>
<%
// The x and y coordinates of the grid
double[] dataX = {0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0};
double[] dataY = {0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0};

// The values at the grid points. In this example, we will compute the values using the formula z =
// sin((x - 0.5) * 2 * pi) * sin((y - 0.5) * 2 * pi)
double[] dataZ = new double[dataX.length * dataY.length];
for (int yIndex = 0; yIndex < dataY.length; ++yIndex) {
    double y = (dataY[yIndex] - 0.5) * 2 * 3.1416;
    for (int xIndex = 0; xIndex < dataX.length; ++xIndex) {
        double x = (dataX[xIndex] - 0.5) * 2 * 3.1416;
        dataZ[yIndex * dataX.length + xIndex] = Math.sin(x) * Math.sin(y);
    }
}

// Create a SurfaceChart object of size 720 x 540 pixels
SurfaceChart c = new SurfaceChart(720, 540);

// Add a title to the chart using 20 points Times New Roman Italic font
c.addTitle("Quantum Wave Function", "Times New Roman Italic", 20);

// Set the center of the plot region at (360, 245), and set width x depth x height to 360 x 360 x
// 270 pixels
c.setPlotRegion(360, 245, 360, 360, 270);

// Set the elevation and rotation angles to 20 and 30 degrees
c.setViewAngle(20, 30);

// Set the data to use to plot the chart
c.setData(dataX, dataY, dataZ);

// Spline interpolate data to a 80 x 80 grid for a smooth surface
c.setInterpolation(80, 80);

// Set surface grid lines to semi-transparent black (dd000000)
c.setSurfaceAxisGrid(0xdd000000);

// Set contour lines to semi-transparent white (80ffffff)
c.setContourColor(0x80ffffff);

// Add a color axis (the legend) in which the left center is anchored at (645, 270). Set the length
// to 200 pixels and the labels on the right side. Use smooth gradient coloring.
c.setColorAxis(645, 270, Chart.Left, 200, Chart.Right).setColorGradient();

// Set the x, y and z axis titles using 10 points Arial Bold font
c.xAxis().setTitle("x/L(x)", "Arial Bold", 10);
c.yAxis().setTitle("y/L(y)", "Arial Bold", 10);
c.zAxis().setTitle("Wave Function Amplitude", "Arial Bold", 10);

// Output the chart
String chart1URL = c.makeSession(request, "chart1", Chart.JPG);
%>
<html>
<body style="margin:5px 0px 0px 5px">
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    Surface Chart (2)
</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/surface2.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import ChartDirector.*;

public class surface2 implements DemoModule
{
    //Name of demo program
    public String toString() { return "Surface Chart (2)"; }

    //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 and y coordinates of the grid
        double[] dataX = {0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0};
        double[] dataY = {0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0};

        // The values at the grid points. In this example, we will compute the values using the
        // formula z = sin((x - 0.5) * 2 * pi) * sin((y - 0.5) * 2 * pi)
        double[] dataZ = new double[dataX.length * dataY.length];
        for (int yIndex = 0; yIndex < dataY.length; ++yIndex) {
            double y = (dataY[yIndex] - 0.5) * 2 * 3.1416;
            for (int xIndex = 0; xIndex < dataX.length; ++xIndex) {
                double x = (dataX[xIndex] - 0.5) * 2 * 3.1416;
                dataZ[yIndex * dataX.length + xIndex] = Math.sin(x) * Math.sin(y);
            }
        }

        // Create a SurfaceChart object of size 720 x 540 pixels
        SurfaceChart c = new SurfaceChart(720, 540);

        // Add a title to the chart using 20 points Times New Roman Italic font
        c.addTitle("Quantum Wave Function", "Times New Roman Italic", 20);

        // Set the center of the plot region at (360, 245), and set width x depth x height to 360 x
        // 360 x 270 pixels
        c.setPlotRegion(360, 245, 360, 360, 270);

        // Set the elevation and rotation angles to 20 and 30 degrees
        c.setViewAngle(20, 30);

        // Set the data to use to plot the chart
        c.setData(dataX, dataY, dataZ);

        // Spline interpolate data to a 80 x 80 grid for a smooth surface
        c.setInterpolation(80, 80);

        // Set surface grid lines to semi-transparent black (dd000000)
        c.setSurfaceAxisGrid(0xdd000000);

        // Set contour lines to semi-transparent white (80ffffff)
        c.setContourColor(0x80ffffff);

        // Add a color axis (the legend) in which the left center is anchored at (645, 270). Set the
        // length to 200 pixels and the labels on the right side. Use smooth gradient coloring.
        c.setColorAxis(645, 270, Chart.Left, 200, Chart.Right).setColorGradient();

        // Set the x, y and z axis titles using 10 points Arial Bold font
        c.xAxis().setTitle("x/L(x)", "Arial Bold", 10);
        c.yAxis().setTitle("y/L(y)", "Arial Bold", 10);
        c.zAxis().setTitle("Wave Function Amplitude", "Arial Bold", 10);

        // 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 surface2();

        //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);
    }
}