Analog Clock






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Jan 7, 2003
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Add an analog clock to your project (A tutorial for creating CStatic derived controls)
Introduction
This article describes how you can add a static control to show an analog clock. This control is derived from CStatic
. First of all, add Clock.h and Clock.cpp files to your project. Select Resource tab from Workspace window, and select your dialog that you want to add an analog clock. Select Static Control from Control Toolbox and draw it on dialog (Figure 1). Change it's ID from IDC_STATIC
to IDC_CLOCK
.
Figure 1 - Add Static Control to your dialog.
Now it's time to add a member variable to your dialog class. Call Class Wizard to do it for you. Figure 2 and 3 show you it. In this case we add a member variable m_Clock
with type CStatic
.
Figure 2 - Add member variable to your dialog class.
Figure 3 - Class Wizard
Ok, open your dialog class header file, add this line on top of your class definition:#include "Clock.h"
Then, change CStatic m_Clock;
to CClock m_Clock;
. Now your dialog definition, looks like this:
// AnalogClockDlg.h : header file // #if !defined(AFX_ANALOGCLOCKDLG_H__D5D048D5_079A_ 40BD_86A0_32A26253D2E5__INCLUDED_) #define AFX_ANALOGCLOCKDLG_H__D5D048D5_079A_40BD_ 86A0_32A26253D2E5__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #include "Clock.h" /////////////////////////////////////////////////////////// // CAnalogClockDlg dialog class CAnalogClockDlg : public CDialog { // Construction public: CAnalogClockDlg(CWnd* pParent = NULL); // standard constructor // Dialog Data //{{AFX_DATA(CAnalogClockDlg) enum { IDD = IDD_ANALOGCLOCK_DIALOG }; CClock m_Clock; //We change it from CStatic m_Clock; //to CClock m_Clock; //}}AFX_DATA // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(CAnalogClockDlg) protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support //}}AFX_VIRTUAL // Implementation protected: HICON m_hIcon; // Generated message map functions //{{AFX_MSG(CAnalogClockDlg) virtual BOOL OnInitDialog(); afx_msg void OnPaint(); afx_msg HCURSOR OnQueryDragIcon(); //}}AFX_MSG DECLARE_MESSAGE_MAP() }; //{{AFX_INSERT_LOCATION}} // Microsoft Visual C++ will insert additional declarations // immediately before the previous line. #endif // !defined(AFX_ANALOGCLOCKDLG_H__D5D048D5_079A_40BD_ //86A0_32A26253D2E5__INCLUDED_)
Member Functions
Class CClock
has only 2 member functions. One for setting clock hand color and other to get clock hand color as below:void SetHandColor(COLORREF color);
e.g.:
COLORREF color; color=RGB(0, 0, 255); //Blue m_Clock.SetHandColor(color);
COLORREF GetHandColor();
e.g.:
COLORREF color;
color=m_Clock.GetHandColor(); //Get color
Now, every thing is ready!
Note
Part of code is obtained from Jeff Prosise Book (Programming with MFC - MSPress). Jeff's code is drawing an analog clock in CView
derived class and I changed it to CStatic
derived class. This code has another difference, if you change time (Control Panel, Date/Time) Jeff's code can not recognize new time. I change his code to recognize new time on the fly!