import java.applet.*;
import java.awt.Graphics;
import java.awt.*;
import java.lang.System;
import java.lang.*;
import java.net.*;
import SimLib.*;

public class Cascade extends thesisApplet   (15) 
{
 boolean useBackgroundImage = true;
 BaseGraphView graphViewer;	
 YGraph          Graph1,Graph2,Graph3;          (3x)   (i.e. No=3)
 TextField       Text1,Text2,Text3,Text4;       (4x)   (i.e. Nt=4)
 Label           Label1,Label2,Label3,Label4;   (4x)   (i.e. Nt=4)
 NumberChooser   Input1,Input2;                 (2x)   (i.e. Ni=2)

 double dN1dt,dN2dt,dN3dt,N1,N2,N3,K1,K2,Error;  (16) 
 double t,dt,Tmin,Tmax;

public void readParameters()	
{
 String useBackgroundImageString = getParameter("useBackgroundImage");
 if (useBackgroundImageString != null)
   {
    useBackgroundImageString.trim();
    useBackgroundImage = useBackgroundImageString.equalsIgnoreCase("true");
   }
}

public void setupGraphs(Container screenView)
{
 initModel();
 screenView.setLayout(new BorderLayout());
 if (useBackgroundImage)
    { graphViewer = new ImageGraphView((thesisApplet)this,Tmin,Tmax);}
 else
    { graphViewer = new ArrayGraphView((thesisApplet)this,Tmin,Tmax);}

 screenView.add("Center", graphViewer);
 Panel temp_panel1 = new Panel();
 temp_panel1.setLayout(new GridLayout(2,1,6,0));   (27a)

 temp_panel1.add(Input1 = 
 new NumberChooser("Tap1","[liter/sec]",1.0,0.0,1.0));  (17) (2x=Ni)
 temp_panel1.add(Input2 = 
 new NumberChooser("Tap2","[liter/sec]",0.5,0.0,1.0));  
		
 screenView.add("West", temp_panel1);
 Graph1 = new YGraph("N1",Color.red,0.0,1.0);     (18) (3x=No)
 Graph2 = new YGraph("N2",Color.green,0.0,1.0);   
 Graph3 = new YGraph("N3",Color.orange,0.0,1.0);   
 
 Panel temp_panel2 = new Panel();
 temp_panel2.setLayout(new GridLayout(8,1));   (27b)

 temp_panel2.add(Label1 = new Label("N1 "));      (26c) (4x=Nt)
 temp_panel2.add(Text1 = new TextField(" "));
 Text1.setEditable(false);
	
 temp_panel2.add(Label2 = new Label("N2 "));     
 temp_panel2.add(Text2 = new TextField(" "));
 Text2.setEditable(false);	
	
 temp_panel2.add(Label3 = new Label("N3 "));   
 temp_panel2.add(Text3 = new TextField(" "));
 Text3.setEditable(false);
 
 temp_panel2.add(Label4 = new Label("Error "));    
 temp_panel2.add(Text4 = new TextField(" "));
 Text4.setEditable(false);

 screenView.add("East", temp_panel2);

 Input1.setColor(Color.blue);      (2x=Ni)
 Input2.setColor(Color.blue);
	
 graphViewer.addYGraph(Graph1);      (3x=No)
 graphViewer.addYGraph(Graph2);
 graphViewer.addYGraph(Graph3);  
}

public void initModel() 
{ 
  Tmin	= 0.0;     (19a)
  Tmax	= 10.0;    (19b)
  dt	= 0.03;    (20)
  t	= 0.0;

  K1	= 1.0;     (21)
  K2	= 0.5;
  N1	= 1.0;
  N2	= 0;
  N3	= 0;
}

public void initInput()
{
  Input1.setValue(K1);     (22) (2x=Ni)
  Input2.setValue(K2);    
}

public void initGraph()
{
  graphViewer.initGraph();
}

public boolean stepModel()
{
 K1 = Input1.getValue();      (23)  (2x=Ni)
 K2 = Input2.getValue();      
 
 t = t + dt;
 
 dN1dt	= - K1 * N1 - K2 * N1;     (24)
 dN2dt	= + K1 * N1;
 dN3dt	= + K2 * N1;
 N1	= N1 + dN1dt * dt;
 N2	= N2 + dN2dt * dt;
 N3	= N3 + dN3dt * dt;
 Error = 1.0 - (N1 + N2 + N3);
 //if (N1 < 0.01)                   (25)
 //   {voice(..) or video(..) with content 'the tank is almost empty'};
 
 Graph1.newValue(N1);      (26a) (3x)
 Graph2.newValue(N2);
 Graph3.newValue(N3);

 Text1.setText(Double.toString(N1));      (26b) (4x=Nt)
 Text2.setText(Double.toString(N2));
 Text3.setText(Double.toString(N3));
 Text4.setText(Double.toString(Error));
 
 graphViewer.newTValue(t);
 return t<Tmax; 
 }
}