Re: Problems with Simple example as applet

• To: Gianluca <gianlucky@xxxxxxxxx>
• Subject: Re: Problems with Simple example as applet
• From: Tom Whittaker <tomw@xxxxxxxxxxxxx>
• Date: Mon, 30 Apr 2001 08:32:24 -0500

I wonder if part of the problem is that Java 3D is not supported by the Java
Virtual Machine that runs under MSIExplorer?  

tom

> Gianluca wrote:
> 
> Hello VisAD List,
> 
> My goad is to visualize a net-CDF file using an applet, and i tryed  to
> transform Simple example to an applet. My Kawa compile and run this file
> successfully, but it don't run with IExplorer.
> 
> Could everyone help me to solve this problem?
> Thanks,
> Gianluca
> 
> ----------------sourcecode-------------------------------------------------------------------------------------------------------------------
> // import needed classes
> import visad.*;
> import visad.java3d.DisplayImplJ3D;
> import visad.util.VisADSlider;
> import visad.data.netcdf.Plain;
> import java.rmi.RemoteException;
> import java.io.IOException;
> import java.awt.*;
> import java.awt.event.*;
> import javax.swing.*;
> import java.applet.*;
> 
> public class Simple extends Applet{
> 
>   // type 'java Simple' to run this application
>   public static void main(String args[])
>          throws VisADException, RemoteException, IOException {
> 
>     Simple SimpleIst = new Simple();
> 
>     // create a DataReference for an image
>     final DataReference image_ref = new DataReferenceImpl("image");
> 
>     // create a netCDF reader
>     Plain plain = new Plain();
> 
>     // open a netCDF file containing an image sequence and adapt
>     // it to a Field Data object
>     Field imagesNC = null;
>     try {
>       imagesNC = (Field) plain.open("images.nc");
>     }
>     catch (IOException exc) {
>       String s = "To run this example, the images.nc file must be "
>         +"present in\nyour visad/examples directory.";
>       System.out.println(s);
>       System.exit(0);
>     }
>     final Field image_sequence = imagesNC;
> 
>     // create a Display using Java3D
>     DisplayImpl display = new DisplayImplJ3D("image display");
> 
>     // extract the type of image and use
>     // it to determine how images are displayed
>     FunctionType image_sequence_type
>       (FunctionType) image_sequence.getType();
>     FunctionType image_type
>       (FunctionType) image_sequence_type.getRange();
>     RealTupleType domain_type = image_type.getDomain();
>     // map image coordinates to display coordinates
>     display.addMap(new ScalarMap((RealType) domain_type.getComponent(0),
>                                  Display.XAxis));
>     display.addMap(new ScalarMap((RealType) domain_type.getComponent(1),
>                                  Display.YAxis));
>     // map image brightness values to RGB (default is grey scale)
>     display.addMap(new ScalarMap((RealType) image_type.getRange(),
>                                  Display.RGB));
> 
>     // link the Display to image_ref
>     // display will update whenever image changes
>     display.addReference(image_ref);
> 
>     // create a DataReference and RealType for an 'hour' value
>     final DataReference hour_ref = new DataReferenceImpl("hour");
>     RealType hour_type
>       (RealType) image_sequence_type.getDomain().getComponent(0);
>     // and link it to a slider
>     VisADSlider slider = new VisADSlider("hour", 0, 3, 0, 1.0,
>                                          hour_ref, hour_type);
> 
>     // create a Cell to extract an image at 'hour'
>     // (this is an anonymous inner class extending CellImpl)
>     Cell cell = new CellImpl() {
>       public void doAction() throws VisADException, RemoteException {
>         // extract image from sequence by evaluating image_sequence
>         // Field at 'hour' value
>         image_ref.setData(image_sequence.evaluate(
>                                        (Real) hour_ref.getData()));
>       }
>     };
>     // link cell to hour_ref to trigger doAction whenever
>     // 'hour' value changes
>     cell.addReference(hour_ref);
> 
>     // create JFrame (i.e., a window) for display and slider
>     JFrame frame = new JFrame("Simple VisAD Application");
>     frame.addWindowListener(new WindowAdapter() {
>       public void windowClosing(WindowEvent e) {System.exit(0);}
>     });
> 
>     // create JPanel in JFrame
>     JPanel panel = new JPanel();
>     panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
>     panel.setAlignmentY(JPanel.TOP_ALIGNMENT);
>     panel.setAlignmentX(JPanel.LEFT_ALIGNMENT);
>     frame.getContentPane().add(panel);
> 
>     // add slider and display to JPanel
>     panel.add(slider);
>     panel.add(display.getComponent());
> 
>     // set size of JFrame and make it visible
>     frame.setSize(500, 600);
>     frame.setVisible(true);
>   }
> }

-- 
Tom Whittaker (tomw@xxxxxxxxxxxxx)
University of Wisconsin-Madison
Space Science and Engineering Center
Phone/VoiceMail: 608/262-2759
Fax: 608/262-5974

• Follow-Ups:
  • Re: Problems with Simple example as applet
    • From: Curtis Rueden

• References:
  • Problems with Simple example as applet
    • From: Gianluca