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

public class Triangles extends Applet 
{

   public void drawRecursiveTriangles( int x1, int y1, int x2, int y2, 
                         int x3, int y3, Graphics surface)
   {
     if (((x1-x2)*(x1-x2) +(y1-y2)*(y1-y2)) > 1)     
                          // square of the length between 
                          // (x1,y1) and (x2,y2)
      
      {
        surface.drawLine(x1,y1,x2,y2);
        surface.drawLine(x2,y2,x3,y3);
        surface.drawLine(x3,y3,x1,y1);

        drawRecursiveTriangles( (x1+x2)/2,(y1+y2)/2, 
                       (x1+x3)/2, (y1+y3)/2, x1,y1, surface);
        drawRecursiveTriangles( (x1+x2)/2,(y1+y2)/2, 
                       (x3+x2)/2, (y3+y2)/2, x2,y2, surface);
        drawRecursiveTriangles( (x1+x3)/2, (y1+y3)/2, 
                       (x3+x2)/2, (y3+y2)/2, x3,y3, surface);
      }
      
  }


   public void paint(Graphics g)
   {
       // use points for the largest triangle  
       drawRecursiveTriangles(10,280,290,280,150,40, g);
   }

}