Draw Math Function In Coordinate
import java.awt.*;
import java.applet.*;
import java.net.URL;
import graph.*;
/*************************************************************************
**
** Applet example1
** Version 1.0 January 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 is a simple applet that demonstrates how to use the basic features
** of the Plotting Class library. The data is calculated locally by
** the applet
**
*************************************************************************/
public class example1 extends Applet {
Graph2D graph;
DataSet data1;
DataSet data2;
Axis xaxis;
Axis yaxis_left;
Axis yaxis_right;
double data[];
int np = 100;
URL markerURL;
public void init() {
int i;
int j;
double data[] = new double[2*np];
/*
** Get the passed parameters
*/
String mfile = "marker.txt";
/*
** Create the Graph instance and modify the default behaviour
*/
graph = new Graph2D();
graph.drawzero = false;
graph.drawgrid = false;
graph.borderTop = 50;
/*
** Load a file containing Marker definitions
*/
try {
//markerURL = this.getClass().(mfile);
markerURL = this.getClass().getResource(mfile);
graph.setMarkers(new Markers(markerURL));
} catch(Exception e) {
System.out.println("Failed to create Marker URL!");
}
setLayout( new BorderLayout() );
add("Center", graph);
/*
** Calculate the first data Set.
*/
for(i=j=0; i<np; i++,j+=2) {
data[j] = j-np;
data[j+1] = 60000 * Math.pow( ((double)data[j]/(np-2) ), 2);
}
data1 = graph.loadDataSet(data,np);
data1.linestyle = 0;
data1.marker = 1;
data1.markerscale = 1.5;
data1.markercolor = new Color(0,0,255);
data1.legend(200,100,"y=6x10{^4}x^2");
data1.legendColor(Color.black);
/*
** Calculate the Second data Set.
*/
for(i=j=0; i<np; i++,j+=2) {
data[j] = j-np;
data[j+1] = Math.pow( ((double)data[j]/(np-2) ), 3);
}
data2 = graph.loadDataSet(data, np);
data2.linecolor = new Color(0,255,0);
data2.marker = 3;
data2.markercolor = new Color(100,100,255);
data2.legend(200,120,"y=x^3");
data2.legendColor(Color.black);
/*
** Attach both data sets to the Xaxis
*/
xaxis = graph.createAxis(Axis.BOTTOM);
xaxis.attachDataSet(data1);
xaxis.attachDataSet(data2);
xaxis.setTitleText("Xaxis");
xaxis.setTitleFont(new Font("TimesRoman",Font.PLAIN,20));
xaxis.setLabelFont(new Font("Helvetica",Font.PLAIN,15));
/*
** Attach the first data set to the Left Axis
*/
yaxis_left = graph.createAxis(Axis.LEFT);
yaxis_left.attachDataSet(data1);
yaxis_left.setTitleText("y=6x10{^4}x^2");
yaxis_left.setTitleFont(new Font("TimesRoman",Font.PLAIN,20));
yaxis_left.setLabelFont(new Font("Helvetica",Font.PLAIN,15));
yaxis_left.setTitleColor( new Color(0,0,255) );
/*
** Attach the second data set to the Right Axis
*/
yaxis_right = graph.createAxis(Axis.RIGHT);
yaxis_right.attachDataSet(data2);
yaxis_right.setTitleText("y=x^3");
yaxis_right.setTitleFont(new Font("TimesRoman",Font.PLAIN,20));
yaxis_right.setLabelFont(new Font("Helvetica",Font.PLAIN,15));
yaxis_right.setTitleColor(new Color(100,100,255) );
}
public static void main(String[] a){
javax.swing.JFrame f = new javax.swing.JFrame();
Applet app = new example1();
app.init();
f.getContentPane().add (app);
f.pack();
f.setSize (new Dimension (500, 500));
f.setVisible(true);
}
}
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