import java.awt.*;
import java.util.*;
import java.applet.*;
import graph.*;
/*************************************************************************
**
**    Applet plot3
**    T. W. Shattuck Colby College              Version 1.0   Feb 2005
**
**************************************************************************
**    Based on example1.java and the 2D graph
**     Java classes by Leigh Brookshaw (1996)
**
**    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.
**************************************************************************
**
**    The 3 data sets are loaded from the 
**    PARAM tag FUNCTION of the calling html, with the
**    starting x value = minimum and then in equal increments.
**    The each data set, the "function", is given as a
**    comma delimited string of y values only.
**
*************************************************************************/

public class plot3 extends Applet {

      Graph2D graph;
      DataSet data1;
      DataSet data2;
      DataSet data3;
      Axis    xaxis;
      Axis    yaxis;
      double data[];
      int np = 500;
      int npd1 ;
      int npd2 ;
      int npd3 ;


      public void init() {
	double xf ;
        int count = 0;
        boolean error = false;
        double data[] = new double[2*np];
/*
**      Get the passed parameters
*/

         String fcnstr1 = getParameter("function1") ; 
         String fcnstr2 = getParameter("function2") ; 
         String fcnstr3 = getParameter("function3") ; 
         String legendstr1 = getParameter("legendtext1") ; 
         String legendstr2 = getParameter("legendtext2") ; 
         String legendstr3 = getParameter("legendtext3") ; 
         double minimum = Float.parseFloat(getParameter("minimum")); 
         double increment = Float.parseFloat(getParameter("increment")); 
         String xlabel = getParameter("xlabel") ;
         String ylabel = getParameter("ylabel") ;

/*
**      Create the Graph instance and modify the default behaviour
*/
        graph = new Graph2D();
        graph.drawzero = false;
        graph.drawgrid = false;
        graph.setGraphBackground(new Color(255,255,255));
        setLayout( new BorderLayout() );
        add("Center", graph);
/*
**      Get the first data Set.
*/
      StringTokenizer en_str1 =  new StringTokenizer(fcnstr1, ",") ;
           npd1 = en_str1.countTokens() ;
        for(int j=0; j<npd1*2; j+=2) {
            data[j] = minimum + j*increment/2 ;
            data[j+1] = Float.parseFloat(en_str1.nextToken()) ;
        }
 
         if(npd1 <= 1) {
             this.showStatus("Error NO POINTS to PLOT!"); 
             System.out.println("Error NO POINTS to PLOT!");
             return;
         }

        data1 = graph.loadDataSet(data,npd1);
        data1.linecolor   =  new Color(255,0,0);
	data1.legend(400,100,legendstr1) ;
	data1.legendColor(Color.red) ;
/*
**      Get the second data Set.
*/
      StringTokenizer en_str2 =  new StringTokenizer(fcnstr2, ",") ;
           npd2 = en_str2.countTokens() ;
        for(int j=0; j<npd2*2; j+=2) {
            data[j] = minimum + j*increment/2 ;
            data[j+1] = Float.parseFloat(en_str2.nextToken()) ;
        }
 
         if(npd2 > 1) {
        	data2 = graph.loadDataSet(data,npd2);
        	data2.linecolor   =  new Color(0,255,0);
		data2.legend(400,120,legendstr2) ;
		data2.legendColor(Color.green) ;
	}
/*
**      Get the third data Set.
*/
      StringTokenizer en_str3 =  new StringTokenizer(fcnstr3, ",") ;
           npd3 = en_str3.countTokens() ;
        for(int j=0; j<npd3*2; j+=2) {
            data[j] = minimum + j*increment/2 ;
            data[j+1] = Float.parseFloat(en_str3.nextToken()) ;
        }
 
         if(npd3 > 1) {
        	data3 = graph.loadDataSet(data,npd3);
        	data3.linecolor   =  new Color(0,0,255);
		data3.legend(400,140,legendstr3) ;
		data3.legendColor(Color.blue) ;
	}
/*
**      Attach data sets to the Xaxis
*/
        xaxis = graph.createAxis(Axis.BOTTOM);
        xaxis.attachDataSet(data1);
        if ( npd2 > 1 ) xaxis.attachDataSet(data2) ;
        if ( npd3 > 1 ) xaxis.attachDataSet(data3) ;
        xaxis.setTitleText(xlabel);
        xaxis.setTitleFont(new Font("TimesRoman",Font.PLAIN,20));
        xaxis.setLabelFont(new Font("Helvetica",Font.PLAIN,15));
/*
**      Attach both data sets
*/
        yaxis = graph.createAxis(Axis.LEFT);
        yaxis.attachDataSet(data1);
        if ( npd2 > 1 ) yaxis.attachDataSet(data2) ;
        if ( npd3 > 1 ) yaxis.attachDataSet(data3) ;
        yaxis.setTitleText(ylabel);
        yaxis.setTitleFont(new Font("TimesRoman",Font.PLAIN,20));
        yaxis.setLabelFont(new Font("Helvetica",Font.PLAIN,15));
      }

}