flocking/Mirror.cpp
void
OnPrintClient(HWND hwnd, HDC hdc) {
  PAINTSTRUCT ps;
  ps.hdc = hdc;
  GetClientRect(hwnd, &ps.rcPaint);
  PaintContent(hwnd, &ps);

}
/*
 *  OnPrintClient
 *      Paint the content as requested by USER.
 */
OnPrintClient
Paint the content as requested by USER.
OnPrintClient Paint the content as requested by USER .
void
OnPrintClient(HWND hwnd, HDC hdc) {
  PAINTSTRUCT ps;
  ps.hdc = hdc;
  GetClientRect(hwnd, &ps.rcPaint);
  PaintContent(hwnd, &ps);
}
void OnPrintClient ( HWND hwnd , HDC hdc ) { PAINTSTRUCT ps ; ps . hdc = hdc ; GetClientRect ( hwnd , & ps . rcPaint ) ; PaintContent ( hwnd , & ps ) ; }
OnPrintClient
      Paint the content as requested by USER.
OnPrintClient Paint the content as requested by USER .