// cash.java
// flow of from a money tank
// adapted from a program in basic by H.T. Odum & E. Odum, 1994.

import java.applet.*;
import java.awt.*;

public class cash extends Applet
{

 Label prompt1, prompt2, prompt3;
 TextField input1, input2, input3;
 Choice chooseEvent;
 Button drawButton;
 double m, k0, k, t1, mi, dm, j0, j;
 int a, t, ti;

 public void init()
 {
	prompt1 = new Label("Start value for M : ");
	input1 = new TextField("10", 5);

	prompt2 = new Label("K Spending coefficient : ");
	input2 = new TextField("5", 4);

	prompt3 = new Label("  t_1 : ");
	input3 = new TextField("96", 4);

	chooseEvent = new Choice();
	chooseEvent.addItem("No change of income/spending");
	chooseEvent.addItem("Get a better salary at t_1");
	chooseEvent.addItem("Win one Million at t_1");
	chooseEvent.addItem("Get robbed at t_1");
	chooseEvent.addItem("Loose your job at t_1");

	drawButton = new Button("Draw");

	add(prompt1);
	add(input1);
	add(drawButton);
	add(prompt2);
	add(input2);
	add(prompt3);
	add(input3);
	add(chooseEvent);
 }

 public boolean action(Event e, Object o)
 {
 	m = (float)Integer.parseInt(input1.getText());
 	k0 = 0.01f*(float)Integer.parseInt(input2.getText());
 	t1 = Integer.parseInt(input3.getText());

	if (e.target instanceof Choice)
		 a = chooseEvent.getSelectedIndex();

 	repaint();
 	return true;
 }

 public void paint(Graphics g)
 {
 	g.drawRect(0,90,320,250);
	t=0;
	j0=4;
	j=j0;
	k=k0;

 	while (t<320)
 	{
	 ti=t+1;
	 if (ti == t1) {
		switch(a) {
		case 0: break;
		case 1: j=j+2; break;
		case 2:	m=m+100;
			g.setColor(Color.red);
			g.drawLine((int)t, (int)(340-mi), (int)ti, (int)(340-m));
			break;
		case 3: m=m-10;
			g.setColor(Color.red);
			g.drawLine((int)t, (int)(340-mi), (int)ti, (int)(340-m));
			break;
		case 4: j=1; k=k0-0.01;
			break;
		default: break;
		}
		}
	 dm=j-k*m;
	 mi=m+dm;
	 g.setColor(Color.blue);
	 g.drawLine((int)t, (int)(340-m), (int)ti, (int)(340-mi));
	 t=ti;m=mi;
	}
  }
}
// Manuel Basler & e. Ortega, October 26th 2000