//cd c:\JavaTry2005\Pascal
//javac Lineart.java
//set CLASSPATH=.
//appletviewer Lineart.java

import java.awt.*;
import java.util.*;
import java.applet.Applet;
/*
 <applet code="Lineart.class" width=800 height=700>
  </applet>
*/
public class Lineart extends Applet {
   public void paint(Graphics g) {
      final int NMAX = 20;
      int x;
      int y;
      int[][] odds = new int[NMAX + 1][];
      for (int n = 0; n <= NMAX; n++)
         odds[n] = new int[n + 1];
      for (int n = 0; n < odds.length; n++){
            odds[n][0] = 1;
         if (n >= 1)
            odds[n][odds[n].length-1] = 1;
      }
      for (int n = 2; n < odds.length; n++)
         for (int k = 1; k < odds[n].length-1; k++) 
            odds[n][k]=odds[n-1][k-1] + odds[n-1][k];
      setBackground(Color.yellow);
       for (int n = 0; n < odds.length; n++) {
         for (int k = 0; k < odds[n].length; k++) {
              x= 400 - 15 * n + 30 * k;
              y=40 + 30 * n;
             if (odds[n][k] % 2 == 0) 
                 g.setColor(Color.red);
              else 
                 g.setColor(Color.blue);
              int[] xdata={x,x-15,x,x+15};
              int[] ydata={y,y+10,y +20,y+10};
              g.fillPolygon(xdata,ydata,4);  //菱形
         }
     }
   }
}

//円あるいは直線にさしかえたもの
//              g.fillOval(x,y,30,30);
//              g.drawLine(x-10,y+10,x+10,y-10);
//              g.drawLine(x+10,y+10,x-10,y-10);

//       g.setFont(new Font("Serif", Font.BOLD, 20));
//       g.setColor(Color.blue);