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
** it under the terms of the GNU General Public License as published by
** 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 {
LoadData dynamic;
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() );
add("North", title);
add("Center", graph);
/*
** 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 x, y, rad;
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;
rad = (x-0.5)*(x-0.5) + (y+0.5)*(y+0.5);
array[count] = Math.exp( -rad/h1 );
rad = (x+0.3)*(x+0.3) + (y-0.75)*(y-0.75);
array[count] += Math.exp( -rad/h2 );
rad = (x+0.7)*(x+0.7) + (y+0.6)*(y+0.6);
array[count] += Math.exp( -rad/h3 );
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.getContentPane().add (app);
f.pack();
f.setSize (new Dimension (500, 500));
f.setVisible(true);
}
}
Graph-Contouring.zip( 233 k)
