/*
VisAD system for interactive analysis and visualization of numerical
data.  Copyright (C) 1996 - 2017 Bill Hibbard, Curtis Rueden, Tom
Rink, Dave Glowacki, Steve Emmerson, Tom Whittaker, Don Murray, and
Tommy Jasmin.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA
*/

// 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.*;

public class Simple {

  // type 'java Simple' to run this application
  public static void main(String args[])
         throws VisADException, RemoteException, IOException {

    // 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."
        +"You can obtain this file from:\n"
        +"  ftp://ftp.ssec.wisc.edu/pub/visad-2.0/images.nc.Z";
      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);
  }
}