ソース
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/**
* <p>タイトル: </p>
* <p>説明: </p>
* <p>著作権: Copyright (c) 2004</p>
* <p>会社名: </p>
* @author 未入力
* @version 1.0
*/
public class Applet1 extends Applet {
private boolean isStandalone = false;
double rx=0.0;
private Scrollbar scrollbar1 = new Scrollbar();
private Label pblabel = new Label();
private Label xlabel = new Label();
private Label label2 = new Label();
private Label label3 = new Label();
//引数値の取得
public String getParameter(String key, String def) {
return isStandalone ? System.getProperty(key, def) :
(getParameter(key) != null ? getParameter(key) : def);
}
//アプレットのビルド
public Applet1() {
}
//アプレットの初期化
public void init() {
try {
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
//コンポーネントの初期化
private void jbInit() throws Exception {
this.setLayout(null);
scrollbar1.setMaximum(50);
scrollbar1.setOrientation(0);
scrollbar1.setBounds(new Rectangle(27, 174, 94, 18));
scrollbar1.addAdjustmentListener(new java.awt.event.AdjustmentListener() {
public void adjustmentValueChanged(AdjustmentEvent e) {
scrollbar1_adjustmentValueChanged(e);
}
});
pblabel.setText("0.0");
pblabel.setBounds(new Rectangle(220, 172, 45, 20));
xlabel.setText("0.0");
xlabel.setBounds(new Rectangle(146, 172, 47, 20));
label2.setText("x");
label2.setBounds(new Rectangle(146, 157, 37, 20));
label3.setText("確率");
label3.setBounds(new Rectangle(217, 156, 53, 17));
this.add(label3, null);
this.add(label2, null);
this.add(scrollbar1, null);
this.add(xlabel, null);
this.add(pblabel, null);
}
//アプレットの情報取得
public String getAppletInfo() {
return "アプレット情報";
}
//引数情報の取得
public String[][] getParameterInfo() {
return null;
}
public void paint(Graphics g){
double x=0.0,y;
int ox=20,oy=120;
double px,py;
px=-4.0;
py=gauss(px,1.0);
for(x=-4.0;x<4.0;x=x+0.02){
y=gauss(x,1.0);
g.drawLine((int)((px+4.0)*30.0)+ox,(int)(oy-py*200.0),
(int)((x+4.0)*30.0)+ox,(int)(oy-y*200.0));
//範囲なら縦線表示
if( x>0.0 && x<rx){
g.setColor(Color.blue);
g.drawLine((int)((x+4.0)*30.0)+ox,oy,
(int)((x+4.0)*30.0)+ox,(int)(oy-y*200.0));
g.setColor(Color.black);
}
px=x;py=y;
}
}
double gauss(double x,double sd){
return (1.0/(Math.sqrt(2.0*Math.PI)*sd))*Math.exp(-x*x/(2.0*sd*sd));
}
double area(double rx){
double x;
double gs=0.0;
double dh=0.01;
for(x=0.0;x<rx;x=x+dh){
gs = gs + (gauss(x,1.0)+gauss(x+dh,1.0))*dh/2.0;
}
//System.out.println("rx:"+rx+" area:"+gs);
pblabel.setText(Double.toString(gs));
xlabel.setText(Double.toString(rx));
return gs;
}
void scrollbar1_adjustmentValueChanged(AdjustmentEvent e) {
rx=(double)e.getValue()/10.0;
area((double)rx);
repaint();
}
}
