/* S0410.java
 *        区間一様乱数の発生 
 *         (C) H.Ishikawa 2008 
 */

package simulation;

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

public class S0410 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 NUMBER  =    10000;
		int SIZE =  20;             	 /* ヒストグラムの大きさ */
		int    j;                  		 /* forのカウンタ */
		int    u;                   	 /* xの整数部分 */
		double x;                     	 /* 一様乱数n個の合計 */
		double a = 5;                   /* 一様分布の下限 */
		double b = 15;                  /* 一様分布の上限 */
		int   f[] = new int[SIZE];      /* 頻度 */
		
		/* グラフィックの準備 */
		int SPACE = 40;
		int HIGHT = 400;
		int WIDTH = 640;
  
		w.setWindow(0,  0.0,0.0,20,0.1501,  SPACE,HIGHT-SPACE,WIDTH-SPACE,SPACE);
		w.axis(0, "x",1, "f[x] / NUMBER", 0.050,g);
		

		/*メイン*/
		for (j = 0; j < NUMBER; j ++) {
			x = a + (b - a) * Math.random();
			u = (int)x;
			f[u] = f[u] + 1;
		}
		
		/* ヒストグラムを書く */
		g.setColor(Color.red);
		for (u = 0; u < SIZE; u ++) {
			w.line(0, u + 0.5, 0, u + 0.5, (double)f[u] / NUMBER,g);
		}
	}
}