[游戏学习28] MFC 时钟

>_<:这是一个时钟小程序

>_<:通过调用获得系统时间然后经过计算得出当前时间，然后再以3个圆环表示时分秒。

>_<:TAO_CLOCK.h

 class CMyApp : public CWinApp
 {
 public:
     virtual BOOL InitInstance ();
 };

 class CMainWindow : public CFrameWnd
 {
 protected:

     int m_nPrevSecond;
     int m_nPrevMinute;
     int m_nPrevHour;

     void Draw(CDC* pDC, int nLength, int nDegrees,
         COLORREF clrColor);//绘制针
     void DrawQ(CDC* pDC, int nLength, COLORREF clrColor);//圈遮盖

 public:
     CMainWindow ();

 protected:
     afx_msg int OnCreate (LPCREATESTRUCT lpcs);       //设置计时器
     afx_msg void OnTimer (UINT nTimerID);              //当WM_TIMER消息到达后就得到当前时间....
     afx_msg void OnPaint ();
     afx_msg void OnClose ();                           //清楚计时器

     DECLARE_MESSAGE_MAP ()
 };

>_<:TAO_CLOCK.cpp

 #include <afxwin.h>
 #include <math.h>
 #include "TAO_CLOCK.h"

 #define SQUARESIZE 20
 #define ID_TIMER_CLOCK 1
 #define kuan  60
 #define miaoL 200
 #define fenL  miaoL-kuan
 #define shiL  fenL-kuan

 CMyApp myApp;

 /////////////////////////////////////////////////////////////////////////
 // CMyApp member functions

 BOOL CMyApp::InitInstance ()
 {
     SetRegistryKey (_T ("Programming Windows with MFC"));
     m_pMainWnd = new CMainWindow;
     m_pMainWnd->ShowWindow (m_nCmdShow);
     m_pMainWnd->UpdateWindow ();
     return TRUE;
 }

 /////////////////////////////////////////////////////////////////////////
 // CMainWindow message map and member functions

 BEGIN_MESSAGE_MAP (CMainWindow, CFrameWnd)
     ON_WM_CREATE ()
     ON_WM_PAINT ()
     ON_WM_TIMER ()
     ON_WM_CLOSE ()
 END_MESSAGE_MAP ()

 CMainWindow::CMainWindow ()
 {

     //得到系统时间，然后初始化时分秒
     CTime time = CTime::GetCurrentTime ();
     m_nPrevSecond = time.GetSecond ();
     m_nPrevMinute = time.GetMinute ();
     m_nPrevHour = time.GetHour () % ;

     CString strWndClass = AfxRegisterWndClass (
         CS_HREDRAW | CS_VREDRAW,
         myApp.LoadStandardCursor (IDC_ARROW),
         (HBRUSH) (COLOR_3DFACE + ),
         NULL
     );

     Create (strWndClass, _T ("Life_leving"));
 }

 int CMainWindow::OnCreate (LPCREATESTRUCT lpcs)
 {
     if (CFrameWnd::OnCreate (lpcs) == -)
         return -;

     //
     // Set a timer to fire at 1-second intervals.
     //
     if (!SetTimer (ID_TIMER_CLOCK, , NULL)) {
         MessageBox (_T ("SetTimer failed"), _T ("Error"),
             MB_ICONSTOP | MB_OK);
         return -;
     }

     return ;
 }

 void CMainWindow::OnClose ()
 {
     KillTimer (ID_TIMER_CLOCK);
     CFrameWnd::OnClose ();
 }

 //当WM_TIMER消息到达后，它就得到当前时间，
 //他将时分秒分别与成员变量记录的时分秒比较
 //如果相同不会执行任何操作，否则将记录新时间
 //并移动Clock的指针
 void CMainWindow::OnTimer (UINT nTimerID)
 {
     /*判断窗口当前是否最小化，最小化返回非0
     可以减小CPU负担isZoomed()判断最大化
     但是在任务栏鼠标靠近时不显示时钟走动效果
     if (IsIconic ())
         return;
     */

     //获取当前时间并与记录时间比较，一样不做任何处理
     CTime time = CTime::GetCurrentTime ();
     int nSecond = time.GetSecond ();
     int nMinute = time.GetMinute ();
     int nHour = time.GetHour () % ;

     if ((nSecond == m_nPrevSecond) &&
         (nMinute == m_nPrevMinute) &&
         (nHour == m_nPrevHour))
         return;

     //最小化时显示数字时钟
     if(IsIconic()){
         CString time;
         time.Format(_T("%0.2d: %0.2d: %0.2d"),nHour,nMinute,nSecond);
         SetWindowText(time);
         return;
     }
     SetWindowText(_T("Life_leving"));

     //MM_ISOTROPIC:X轴和Y轴具有相同的逻辑单位（映射）
     //设置每个方向上设置具有1000个单位
     //把原点移至中心
     CRect rect;
     GetClientRect (&rect);

     CClientDC dc (this);
     dc.SetMapMode (MM_ISOTROPIC);
     dc.SetWindowExt (, );
     dc.SetViewportExt (rect.Width (), -rect.Height ());
     dc.SetViewportOrg (rect.Width () / , rect.Height () / );

     //
     // If minutes have changed, erase the hour and minute hands.
     //
     COLORREF clrColor = ::GetSysColor (COLOR_3DFACE);

     if (nMinute != m_nPrevMinute) {
         m_nPrevMinute = nMinute;//更新时分
         m_nPrevHour = nHour;
     }

     //
     // If seconds have changed, erase the second hand and redraw all hands.
     //
     if (nSecond != m_nPrevSecond) {
         CRect rect(-,,,-);
         CBrush brush(clrColor);
         CBrush* pOldBrush=dc.SelectObject(&brush);
         dc.Rectangle(rect);
         dc.SelectObject(pOldBrush);
         Draw(&dc,miaoL, nSecond * , RGB (, , ));//每秒走6度
         Draw(&dc,shiL, (nHour * ) + (nMinute / ),//每小时30度+每分钟0.5度
             RGB (, , ));
         Draw(&dc, fenL,  nMinute * , RGB (, , ));//每分钟6度
         m_nPrevSecond = nSecond;//更新秒
     }

     //if(nSecond==0)DrawQ(&dc,miaoL,clrColor);
     //if(nMinute==0)DrawQ(&dc,fenL,clrColor);
     //if(nHour==0)DrawQ(&dc,shiL,clrColor);

 }

 void CMainWindow::OnPaint ()
 {
     //重绘的时候也要重新设定窗口映射
     CRect rect;
     GetClientRect (&rect);

     CPaintDC dc (this);
     dc.SetMapMode (MM_ISOTROPIC);
     dc.SetWindowExt (, );
     dc.SetViewportExt (rect.Width (), -rect.Height ());
     dc.SetViewportOrg (rect.Width () / , rect.Height () / );

     //画上钟面+时分秒针
     Draw(&dc,shiL, (m_nPrevHour * ) +
         (m_nPrevMinute / ), RGB (, , ));
     Draw(&dc,fenL, m_nPrevMinute * , RGB (, , ));
     Draw(&dc,miaoL, m_nPrevSecond * , RGB (, , ));

     COLORREF clrColor = ::GetSysColor (COLOR_3DFACE);

 }

 //画秒针
 void CMainWindow::Draw (CDC* pDC, int nLength ,
     int nDegrees, COLORREF clrColor)
 {
     CPoint point[];
     CRect rect(-(nLength+kuan),(nLength+kuan),(nLength+kuan),-(nLength+kuan));

     double nRadians = (double) nDegrees * 0.017453292;//转化为弧度制

     point[].x = ;
     point[].y = ;
     point[].x = (int) ((nLength+) * sin (nRadians));//注意转换（坐标系变换）
     point[].y = (int) ((nLength+) * cos (nRadians));

     CPen pen (PS_SOLID,kuan, clrColor);
     CPen* pOldPen = pDC->SelectObject (&pen);

     pDC->Arc(rect,point[],point[]);

     pDC->SelectObject (pOldPen);
 }

 //画圈
 void CMainWindow::DrawQ (CDC* pDC, int nLength, COLORREF clrColor){

     CRect rect(-(nLength+kuan),(nLength+kuan),(nLength+kuan),-(nLength+kuan));
     CPen pen (PS_SOLID,kuan, clrColor);
     CBrush brush(clrColor);
     CPen* pOldPen = pDC->SelectObject (&pen);
     CBrush* pOldBrush = pDC->SelectObject (&brush);
     pDC->Ellipse(rect);
     Draw(pDC,shiL, (m_nPrevHour * ) + (m_nPrevMinute / ),//每小时30度+每分钟0.5度
             RGB (, , ));
     Draw(pDC, fenL,  m_nPrevMinute * , RGB (, , ));//每分钟6度
     pDC->SelectObject (pOldPen);
     pDC->SelectObject (pOldBrush);
 }