Multiple Clocks

Introduction

This dialog-based application displays several different styles of clocks: analog, binary, decimal, and nixie.

Background

The Nixie tube was used in electronic instruments mainly in the 1960s thru 1980s. It is a neon-filled vacumn tube with 10 elements that can make the neon glow when any one element is grounded. The tube has a common anode with approximately 175 volts DC applied to it. I think it makes a cool clock.

Using the Code

Several methods used in this code are borrowed from other programmers, some from this site (see Credits). The heart of the binary clock is the _itoa(nTime, ibuff, 2); function, where nTime is any integer contaning the hour, minute, or second. ibuff is a char buffer and the 2 is a base, in this case, binary.

Here is the code to display a simple Decimal clock in the Windows Title Bar.

void CMultiClockDlg::DisplayDecimal()
{
   //
   // Get the current time
   //
   CTime time  = CTime::GetCurrentTime();
   int nSecond = time.GetSecond();
   int nMinute = time.GetMinute();
   int nHour   = time.GetHour();
   if (nHour > 12)
      nHour -= 12;
   CString szStr;
   szStr.Format("MultiClock - %.2d:%.2d:%.2d", nHour, nMinute, nSecond);
   ::SetWindowText(m_hWnd, szStr);
}

Points of Interest

The Binary display is grouped: 4 bits for the hour, and 6 bits for the minutes and seconds. I did this because the hour can only be "01" thru "C" and the minutes/seconds "00" thru "3B". The nixie clock uses bitmaps (45X64) for each digit; they are diplayed by calling:

void CMultiClockDlg::FormatTm(CDC *pDC, int nTime, int nPos)
{
   int x, y;
   m_bmp.LoadResource(IDB_BITMAP110);
   x = 8 +(m_bmp.GetWidth() * nPos);
   y = 8;
   switch (nTime)
   {
      case 0:
         m_bmp.LoadResource(IDB_BITMAP100);
         m_bmp.DrawDIB(pDC, x, y);
         break;
   }

One thing I found when writing this code was this: DO NOT USE CDC *pDC = GetDC(); in a loop without using RelaseDC(pDC); My first version would run for 15 to 20 minutes and crash because GetDC() uses 4 bytes of memory every time it is called.

Credits

ClockCtrl—The Analog Clock
Author: P.J. Naughter

Dib256—Load Resource/Paint Bitmap
DibPal
Author: Jorg Konig

History

Version 1.0
Any comments or suggestions are welcome.



Downloads

Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • The nature of the financial services industry places a myriad of international compliance requirements on a company's IT team, as well as an expectation by its customers to deliver the high test levels of performance and reliability. To survive and thrive, businesses in the industry must not only keep pace with customer demand but gain competitive advantage. Those demands mean the IT team must be at the forefront of adopting emerging technologies

  • Do you spend a lot of time thinking about your enemies? Attacker attribution - figuring out who's out to get you - is one of the most important things an organization can do to protect itself.  Because you have no hope of defending yourself if you don't understand who the attackers are. Good news? Every organization isn't targeted by all the attackers. Bad news? No one can identify your potential attackers as well as you. Read this graphics-rich threat summary for 2014 to determine who might be your next …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date