:  case WM_PAINT:
:   hdc = BeginPaint(hWnd, &ps);
:   // TODO: 여기에 그리기 코드를 추가합니다.
: 
:   Rectangle(hdc, rtBoard.left, rtBoard.top, rtBoard.right,rtBoard.bottom);
: 
:
:         x = rtBoard.left+ nWidth*ix;
:         y = rtBoard.top + nHeight*iy;
: 
:  // Ellipse(hdc, x, y, x+nWidth, y+nHeight);
: 
:
:   for(i=0 ; i<=N; i++)
:   {
:          x = rtBoard.left+ nWidth*i;
:          MoveToEx(hdc,x,rtBoard.top, NULL);
:       LineTo(hdc,  x, rtBoard.bottom);
:   }
//--------- 추가 --------
    for( i = 0; i <=N; ++i)
   {
       x = rtBoard.left+ nHeight*i;
:          MoveToEx(hdc,rtBoard.left, y, NULL);
:       LineTo(hdc,  rtBoard.right, y);
:  }
: 
:   EndPaint(hWnd, &ps);
:   break;