Howdy, Folks:
I changed program P3_01 a little bit, the domain_set is a irregular 2d set.
I want to use this changed program to visualize the pixel_value in the given
domain, which is a annular area with inner radius of 1 and outer radius of
6. I wonder why the area with radius<1 is also painted. If you could please
run it and you will see it. I will appreciate it if you could keep me
informed why? Thanks so much.
Yi
/*
VisAD Tutorial
Copyright (C) 2000 Ugo Taddei
*/
// Import needed classes
import visad.*;
import visad.java2d.DisplayImplJ2D;
import java.rmi.RemoteException;
import javax.swing.*;
/**
VisAD Tutorial example 3_01
A function pixel_value = f(row, column)
with MathType ( (row, column) -> pixel ) is plotted
The domain set is an Integer1DSet
Run program with "java P3_01"
*/
public class P3_01{
// Declare variables
// The quantities to be displayed in x- and y-axes: row and column
// The quantity pixel will be mapped to RGB color
private RealType row, column, pixel;
// A Tuple, to pack row and column together, as the domain
private RealTupleType domain_tuple;
// The function ( (row, column) -> pixel )
// That is, (domain_tuple -> pixel )
private FunctionType func_dom_pix;
// 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 rowMap, colMap, pixMap;
public P3_01(String []args)
throws RemoteException, VisADException {
// Create the quantities
// Use RealType(String name);
row = new RealType("ROW");
column = new RealType("COLUMN");
domain_tuple = new RealTupleType(row, column);
pixel = new RealType("PIXEL");
// Create a FunctionType (domain_tuple -> pixel )
// Use FunctionType(MathType domain, MathType range)
func_dom_pix = new FunctionType( domain_tuple, pixel);
// Create the domain Set, with 5 columns and 6 rows, using an
// Integer2DSet(MathType type, int lengthX, lengthY)
int NCOLS = 5;
int NROWS = 6;
float[][] sd=new float[][]{
{
1f,2f,3f,4f,5f,6.0f,
0.92f,1.84f,2.76f,3.68f,4.6f,5.52f,
0.71f,1.42f,2.13f,2.84f,3.55f,4.26f,
0.38f,0.76f,1.14f,1.52f,1.9f,2.3f,
0f,0f,0f,0f,0f,0f
},
{
0f,0f,0f,0f,0f,0f,
0.38f,0.76f,1.14f,1.52f,1.9f,2.3f,
0.71f,1.42f,2.13f,2.84f,3.55f,4.26f,
0.92f,1.84f,2.76f,3.68f,4.6f,5.52f,
1f,2f,3f,4f,5f,6.0f,
},
};
Set domain_set=new Irregular2DSet(domain_tuple,sd);
for(int i=0;i<30;i++){
System.out.print(sd[0][i]+"\t");
}
// Our pixel values, given as a float[6][5] array
float[][] pixel_vals = new float[][]{{0, 6, 12, 18, 24},
{1, 7, 12, 19, 25},
{2, 8, 14, 20, 26},
{3, 9, 15, 21, 27},
{4, 10, 16, 22, 28},
{5, 11, 17, 23, 29} };
// We create another array, with the same number of elements of
// pixel_vals[][], but organized as float[1][ number_of_samples ]
float[][] flat_samples = new float[1][NCOLS * NROWS];
// ...and then we fill our 'flat' array with the original values
// Note that the pixel values indicate the order in which these values
// are stored in flat_samples
for(int c = 0; c < NCOLS; c++)
for(int r = 0; r < NROWS; r++)
flat_samples[0][ c * NROWS + r ] = pixel_vals[r][c];
// Create a FlatField
// Use FlatField(FunctionType type, Set domain_set)
vals_ff = new FlatField( func_dom_pix, domain_set);
// ...and put the pixel values above into it
vals_ff.setSamples( flat_samples );
// Create Display and its maps
// A 2D display
display = new DisplayImplJ2D("display1");
// Get display's graphics mode control and draw scales
GraphicsModeControl dispGMC = (GraphicsModeControl)
display.getGraphicsModeControl();
dispGMC.setScaleEnable(true);
// Create the ScalarMaps: column to XAxis, row to YAxis and pixel to RGB
// Use ScalarMap(ScalarType scalar, DisplayRealType display_scalar)
colMap = new ScalarMap( column, Display.XAxis );
rowMap = new ScalarMap( row, Display.YAxis );
pixMap = new ScalarMap( pixel, Display.RGB );
// Add maps to display
display.addMap( colMap );
display.addMap( rowMap );
display.addMap( pixMap );
// Create a data reference and set the FlatField as our data
data_ref = new DataReferenceImpl("data_ref");
data_ref.setData( vals_ff );
// Add reference to display
display.addReference( data_ref );
// Create application window and add display to window
JFrame jframe = new JFrame("VisAD Tutorial example 3_01");
jframe.getContentPane().add(display.getComponent());
// Set window size and make it visible
jframe.setSize(300, 300);
jframe.setVisible(true);
}
public static void main(String[] args)
throws RemoteException, VisADException
{
new P3_01(args);
}
} //end of Visad Tutorial Program 3_01
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