/* S0610.java
 *        １次元ランダムウォーク  
 *         (C) H.Ishikawa 2008 
 */

package simulation;

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import window.Window;


public class S0610 extends Applet implements ActionListener {
	Button button0;
	public void init() {
		button0 = new Button(" 再実行 ");
		add(button0);
		button0.addActionListener(this);
	}
	public void actionPerformed(ActionEvent e) {
		String label = e.getActionCommand();
		repaint();
	}

	public void paint(Graphics g) {
		Window w ;
		w = new Window();
		int SPACE = 30;
		int HIGHT = 400;
		int WIDTH = 640;
		
		long      t = 0;
		long      x = 0;
		long T_END =   1000; /* 終りの時刻 */
		double P =       0.5;   /* 確率 */

		/*グラフィックの準備*/
		w.setWindow(0,  0.0,-100.0,T_END,100.0,  SPACE,HIGHT-SPACE,WIDTH-SPACE,SPACE);
		w.axis(0, "t", T_END/10, "x", 10, g);		
		w.moveTo(0, 0.0, 0.0, g);
  
		/*メイン*/
		for (t = 0; t < T_END; t ++) {
			if (P > Math.random()) {
				x = x + 1;
			} else {
				x = x - 1;
			}
			g.setColor(Color.green);
			w.lineTo(0, (double)(t), (double)(x), g);
		}
		stop();
	}
}