# Contouring : Math Functions « Advanced Graphics « Java

Contouring

```import java.awt.*;
import java.applet.*;
import java.net.URL;
import java.util.*;
import graph.*;
/*************************************************************************
**
**    Applet example6
**                                              Version 1.0   February 1996
**
**************************************************************************
**    Copyright (C) 1996 Leigh Brookshaw
**
**    This program is free software; you can redistribute it and/or modify
**    the Free Software Foundation; either version 2 of the License, or
**    (at your option) any later version.
**
**    This program 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 General Public License for more details.
**
**    You should have received a copy of the GNU General Public License
**    along with this program; if not, write to the Free Software
**    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**************************************************************************
**
**    This applet demonstrates the the contouring cababilities
**    of the Contour class
**
*************************************************************************/

public class example6 extends Applet {

Contour graph;
Label title;
Axis    xaxis;
Axis    yaxis;

public void init() {
int i;
int j;

/*
**      Instantiate the Contour class and calculate the data
*/
graph = new Contour();
graph.setDataBackground(new Color(0.933f,0.914f,0.749f));
graph.setContourColor(new Color(0.180f,0.545f,0.341f));
graph.setLabelledContourColor(new Color(0.5f,.0f,0.0f));

graph.setLabelPrecision(2);
graph.setLabelSignificance(2);

//        this.showStatus("Creating Data to Contour!");

createGrid(graph);

graph.square       = true;
/*
**      Build the title and place it at the top of the graph
*/
graph.setFont(new Font("TimesRoman",Font.PLAIN,25));
title = new Label("Contouring Example", Label.CENTER);
title.setFont(new Font("TimesRoman",Font.PLAIN,25));

setLayout( new BorderLayout() );
/*
**      Instantiate the xaxis and attach the dataset.
*/
xaxis = graph.createXAxis();
xaxis.setTitleText("X_axis");
xaxis.setTitleColor(Color.magenta);
xaxis.setTitleFont(new Font("TimesRoman",Font.ITALIC,25));
xaxis.setLabelFont(new Font("Helvetica",Font.PLAIN,20));

/*
**      Instantiate the yaxis and attach the dataset.
*/
yaxis = graph.createYAxis();
yaxis.setTitleText("Y_axis");
yaxis.setTitleColor(Color.magenta);
yaxis.setTitleFont(new Font("TimesRoman",Font.ITALIC,25));
yaxis.setLabelFont(new Font("Helvetica",Font.PLAIN,20));

}

public void createGrid(Contour graph) {
int i,j;
int count;

int nx = 50;
int ny = 50;

double xmin = -1.0;
double xmax =  1.0;
double ymax =  1.0;
double ymin = -1.0;

double array[] = new double[nx*ny];

double h1, h2, h3;

h1 = 0.5*0.5;

h2 = 0.75*0.75;

h3 = 0.25*0.25;

count = 0;

for(j=0; j<ny; j++) {

y = 2.0*(double)j/(double)(ny-1) - 1.0;

for(i=0; i<nx; i++) {
x = 2.0*(double)i/(double)(nx-1) - 1.0;

count++;
}
}

graph.setGrid(array,nx,ny);
graph.setRange(xmin,xmax,ymin,ymax);
graph.setLimitsToGrid(true);
graph.setLabelLevels(3);
graph.setNLevels(20);
}
public static void main(String[] a){
javax.swing.JFrame f = new javax.swing.JFrame();
Applet app = new example6();
app.init();

f.pack();
f.setSize (new Dimension (500, 500));
f.setVisible(true);
}
}

```
Graph-Contouring.zip( 233 k)

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