// drain.java
// draining tank
// adapted from a program in basic by H.T. Odum & E. Odum, 1994

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

public class drain extends Applet {

	double Q,K,DQ,Q0;
	Label prompt1,prompt2;
	TextField input1,input2;
	Button drawbutton;

 public void init()
	{
	prompt1 = new Label("Start value for Q : ");
	input1 = new TextField("150",10);
	add(prompt1);add(input1);

	prompt2 = new Label("K1 Outflow coefficient : ");
	input2 = new TextField("1",5);
	add(prompt2);add(input2);

	drawbutton = new Button("Draw");
	add(drawbutton);
	}

 public boolean action(Event e, Object o)
	{
	Q=(float)Integer.parseInt(input1.getText());
	K=(float)Integer.parseInt(input2.getText());
	repaint();
	return true;
	}

 public void paint ( Graphics g )
	{
	int t,t0;
	g.drawRect(0,60,320,240);
	Q0=(float)0.1;t0=0;t=0;
	K=K/100;

	while (t<=320)
	{
		DQ=-K*Q;
		Q=Q+DQ;
		g.drawLine(t0, (int)(240-Q0),t,(int)(240-Q));
		t0=t;Q0=Q;
		t+=1;
	}
 }
}
// Manuel Basler & E. Ortega, September 25th 2000*/