/*
VisAD Tutorial
Copyright (C) 2000 Ugo Taddei
*/


// Import needed classes
import visad.*;
import visad.util.*;
import visad.java2d.DisplayImplJ2D;
import java.rmi.RemoteException;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import jhplot.*;

  /**
  VisAD Tutorial example 
  Show  isocontour over image
  We have the function temperature = f(latitude, longitude)
  represented by the MathType
  ( (latitude, longitude) -> elevation )
 */



public class visad_2D_iso2{

  // The domain quantities longitude and latitude
  // and the dependent quantity temperature
  private RealType longitude, latitude;
  private RealType temperature;


  // Tuple to pack longitude and latitude together, as the domain
  private RealTupleType domain_tuple;

  // The function (domain_tuple -> temperature )
  // Remeber, range is only "temperature"
  private FunctionType func_domain_temp;

  // Our Data values for the domain are represented by the Set
  private Set domain_set;

  // The Data class FlatField
  private FlatField vals_ff;

  // The DataReference from data to display
  private DataReferenceImpl data_ref;

  // The 2D display, and its the maps
  private DisplayImpl display;
  private ScalarMap latMap, lonMap;
  private ScalarMap tempIsoMap, tempRGBMap;

  // These objects are for drawing isocontours
  private RealType isoTemperature;
  private FunctionType func_domain_isoTemp;

  private FlatField iso_vals_ff;
  private DataReferenceImpl iso_data_ref;


  public visad_2D_iso2(String []args)
    throws RemoteException, VisADException {



// get 2D display
    HVisAd c1=new HVisAd("2D example",false);
    display = c1.getDisplay();
    DisplayRenderer ren=c1.getRender(); 
    ren.setBackgroundColor(Color.white); 
    display.getGraphicsModeControl().setLineWidth(1.0f);

    // Create the quantities
    // Use RealType(String name);
    latitude = RealType.getRealType("latitude");
    longitude = RealType.getRealType("longitude");

    domain_tuple = new RealTupleType(latitude, longitude);
    temperature = RealType.getRealType("temperature", SI.kelvin, null);
    isoTemperature = RealType.getRealType("isoTemperature", SI.kelvin, null);

    // Create a FunctionType (domain_tuple -> temperature )
    // Use FunctionType(MathType domain, MathType range)
    func_domain_temp = new FunctionType( domain_tuple, temperature);

    // ... the same for isoTemperature
    func_domain_isoTemp = new FunctionType( domain_tuple, isoTemperature);

    // Create the domain Set
    // Use LinearDSet(MathType type, double first1, double last1, int lengthX,
    //				     double first2, double last2, int lengthY)
    int NCOLS = 50;
    int NROWS = NCOLS;
    domain_set = new Linear2DSet(domain_tuple, -Math.PI, Math.PI, NROWS,
    					       -Math.PI, Math.PI, NCOLS);

    // Get the Set samples to facilitate the calculations
    float[][] set_samples = domain_set.getSamples( true );


    // The actual temperature values are stored in this array
    // float[1][ number_of_samples ]
    float[][] flat_samples = new float[1][NCOLS * NROWS];

    // We fill our 'flat' array with the generated values
    // by looping over NCOLS and NROWS
    for(int c = 0; c < NCOLS; c++)
      for(int r = 0; r < NROWS; r++){
	// ...temperature
	flat_samples[0][ c * NROWS + r ] = (float)( (Math.sin( 0.50*(double) set_samples[0][ c * NROWS + r ])  ) * Math.cos( (double) set_samples[1][ c * NROWS + r ] ) ) ;

    }


    // Create the FlatFields
    // Use FlatField(FunctionType type, Set domain_set)
    // For the colored image
    vals_ff = new FlatField( func_domain_temp, domain_set);

    // ...and put the values above into it
    // Note the argument false, meaning that the array won't be copied
    vals_ff.setSamples( flat_samples , false );


    // ...and for the isocontours
    iso_vals_ff = new FlatField( func_domain_isoTemp, domain_set);


    // Get the values from the temperature FlatField
    // create flat_isoVals array for clarity's sake
    // "false" argument means "don't copy"
    float[][] flat_isoVals = vals_ff.getFloats(false);

    // ...and put the values above into it
    // Note the argument false, meaning that the array won't be copied again
    iso_vals_ff.setSamples( flat_isoVals , false );


    // Create Display and its maps
    // Get display's graphics mode control and draw scales
    GraphicsModeControl dispGMC = (GraphicsModeControl)  display.getGraphicsModeControl();
    dispGMC.setScaleEnable(true);



    // Create the ScalarMaps: latitude to YAxis, longitude to XAxis and
    // temperature to RGB and
    // isoTemperature to IsoContour
    // Use ScalarMap(ScalarType scalar, DisplayRealType display_scalar)
    latMap = new ScalarMap( latitude, Display.YAxis );
    lonMap = new ScalarMap( longitude, Display.XAxis );
    latMap.getAxisScale().setColor(Color.black);
    lonMap.getAxisScale().setColor(Color.black);
    latMap.getAxisScale().setLabelSize(18);
    lonMap.getAxisScale().setLabelSize(18);
    //latMap.getAxisScale().setSnapToBox(true);
    //lonMap.getAxisScale().setSnapToBox(true);

    tempIsoMap = new ScalarMap( isoTemperature,  Display.IsoContour );
    tempRGBMap = new ScalarMap( temperature,  Display.RGB );


    // Add maps to display
    display.addMap( latMap );
    display.addMap( lonMap );

    display.addMap( tempIsoMap );
    display.addMap( tempRGBMap );

    // The ContourControl
    // Note that we get the control from the IsoContour map
    ContourControl isoControl = (ContourControl) tempIsoMap.getControl();

    // Define some parameters for contour lines

    float interval = 0.1250f;  // interval between lines
    float lowValue = -0.50f;   // lowest value
    float highValue = 1.0f;    // highest value
    float base = -1.0f;        //  starting at this base value

    // ...and set the lines with the method
    isoControl.setContourInterval(interval, lowValue, highValue, base);
    isoControl.enableLabels(true);

    // Create data references and set the FlatField as our data
    data_ref = new DataReferenceImpl("data_ref");
    iso_data_ref = new DataReferenceImpl("iso_data_ref");

    data_ref.setData( vals_ff );
    iso_data_ref.setData( iso_vals_ff );

    // Add reference to display
    display.addReference( data_ref );
    display.addReference( iso_data_ref );

   // show it
    c1.visible(true);
  }


  public static void main(String[] args)
    throws RemoteException, VisADException
  {
    new visad_2D_iso2(args);
  }

}