大家给点意见该怎么做： 我想做一个手表一样的界面，时间表盘是贴图，怎么操作针的走动？

Question

如果大家有什么现成的例子更好了。谢谢大家

Answer 1

调用sin函数求坐标画线就可以了，很简单，不过要做漂亮比较麻烦。

Answer 2

这是我刚接触VC时用来练手写的一个Clock程序中的一块，如果不嫌臭，就拿去看看吧：
void CClockDlg::OnTimer(UINT nIDEvent) 
{
// TODO: Add your message handler code here and/or call default
if(nIDEvent==1)
{
CPoint NewPoint,CentrePoint=wndRect.CenterPoint();
CTime time;
time=CTime::GetCurrentTime();
CDC *pDC=GetDC();
//时间指针
int iH=time.GetHour();
int iM=time.GetMinute();
int iS=time.GetSecond();
int r=wndRect.Width()/2;
static int iiH,iiM,iiS;
iH=iH*60*60+iM*60+iS;
iM=iM*60+iS;

//时针，擦去前次时针
CPen *OldPen,HourPen(PS_SOLID,8,RGB(255,0,255)),OldHourPen(PS_SOLID,8,RGB(0,0,0));
OldPen=pDC->SelectObject(&OldHourPen);
NewPoint.x=CentrePoint.x-0.1*r*sin(PI*iiH/21600);
NewPoint.y=CentrePoint.y+0.1*r*cos(PI*iiH/21600);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.4*r*sin(PI*iiH/21600);
NewPoint.y=CentrePoint.y-0.4*r*cos(PI*iiH/21600);
iiH=iH;
pDC->LineTo(NewPoint);
//分针，擦去前次分针
CPen MinutePen(PS_SOLID,6,RGB(255,255,0)),OldMinutePen(PS_SOLID,6,RGB(0,0,0));
pDC->SelectObject(&OldMinutePen);
NewPoint.x=CentrePoint.x-0.2*r*sin(PI*iiM/1800);
NewPoint.y=CentrePoint.y+0.2*r*cos(PI*iiM/1800);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.6*r*sin(PI*iiM/1800);
NewPoint.y=CentrePoint.y-0.6*r*cos(PI*iiM/1800);
iiM=iM;
pDC->LineTo(NewPoint);
//秒针，擦去前次秒针
CPen SecondPen(PS_SOLID,2,RGB(255,0,0)),OldSecondPen(PS_SOLID,2,RGB(0,0,0));
pDC->SelectObject(&OldSecondPen);
NewPoint.x=CentrePoint.x-0.3*r*sin(PI*iiS/30);
NewPoint.y=CentrePoint.y+0.3*r*cos(PI*iiS/30);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.8*r*sin(PI*iiS/30);
NewPoint.y=CentrePoint.y-0.8*r*cos(PI*iiS/30);
iiS=iS;
pDC->LineTo(NewPoint);
//数字日期时间
CString strTime;
strTime=time.Format("%Y年%m月%d日 %H:%M:%S %A");
pDC->SetBkColor(RGB(0,0,0));
pDC->SetTextColor(RGB(200,255,255));
pDC->TextOut(wndRect.CenterPoint().x-100,wndRect.CenterPoint().y*1.35,strTime);
//时针
pDC->SelectObject(&HourPen);
NewPoint.x=CentrePoint.x-0.1*r*sin(PI*iH/21600);
NewPoint.y=CentrePoint.y+0.1*r*cos(PI*iH/21600);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.4*r*sin(PI*iH/21600);
NewPoint.y=CentrePoint.y-0.4*r*cos(PI*iH/21600);
pDC->LineTo(NewPoint);
//分针
pDC->SelectObject(&MinutePen);
NewPoint.x=CentrePoint.x-0.2*r*sin(PI*iM/1800);
NewPoint.y=CentrePoint.y+0.2*r*cos(PI*iM/1800);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.6*r*sin(PI*iM/1800);
NewPoint.y=CentrePoint.y-0.6*r*cos(PI*iM/1800);
pDC->LineTo(NewPoint);
//秒针
pDC->SelectObject(&SecondPen);
NewPoint.x=CentrePoint.x-0.3*r*sin(PI*iS/30);
NewPoint.y=CentrePoint.y+0.3*r*cos(PI*iS/30);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.8*r*sin(PI*iS/30);
NewPoint.y=CentrePoint.y-0.8*r*cos(PI*iS/30);
pDC->LineTo(NewPoint);
//中心柱
CRect CentreRect;
CPen CentrePen(PS_SOLID,5,RGB(255,0,0));
CBrush CentreBrush(RGB(100,100,0));
pDC->SelectObject(&CentreBrush);
pDC->SelectObject(&CentrePen);
CentreRect.left=wndRect.CenterPoint().x-8;
CentreRect.top=wndRect.CenterPoint().y-8;
CentreRect.right=wndRect.CenterPoint().x+8;
CentreRect.bottom=wndRect.CenterPoint().y+8;
pDC->Ellipse(CentreRect);

pDC->SelectObject(OldPen);
ReleaseDC(pDC);
}
CDialog::OnTimer(nIDEvent);
}

Answer 3

XunBaian(蓝水晶), 能把你的代码一块给我学习学习吗？

Answer 4

wndRect是一个全局变量，在窗体初始化里得到的this->GetClientRect( &wndRect );

Answer 5

如果你非得要让我出洋相，我只好全贴出来了：// ClockDlg.h : header file
//#if !defined(AFX_CLOCKDLG_H__0F131CD3_6D32_49BC_9423_383AEBA0A701__INCLUDED_)
#define AFX_CLOCKDLG_H__0F131CD3_6D32_49BC_9423_383AEBA0A701__INCLUDED_#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
const float PI = 3.1415926535897932384626;/////////////////////////////////////////////////////////////////////////////
// CClockDlg dialogclass CClockDlg : public CDialog
{
CRect wndRect;
// Construction
public:
CClockDlg(CWnd* pParent = NULL); // standard constructor// Dialog Data
//{{AFX_DATA(CClockDlg)
enum { IDD = IDD_CLOCK_DIALOG };
// NOTE: the ClassWizard will add data members here
//}}AFX_DATA // ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CClockDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL// Implementation
protected:
HICON m_hIcon; // Generated message map functions
//{{AFX_MSG(CClockDlg)
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
afx_msg void OnLButtonDblClk(UINT nFlags, CPoint point);
afx_msg void OnTimer(UINT nIDEvent);
afx_msg void OnClose();
afx_msg void OnRButtonUp(UINT nFlags, CPoint point);
afx_msg void OnExit();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.#endif // !defined(AFX_CLOCKDLG_H__0F131CD3_6D32_49BC_9423_383AEBA0A701__INCLUDED_)

Answer 6

// ClockDlg.cpp : implementation file
//#include "stdafx.h"
#include "Clock.h"
#include "ClockDlg.h"
#include "winuser.h"
#include "AboutDialog.h"
#include "math.h"
#include "time.h"
#include "Panel.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialog
{
public:// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA // ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
//}}AFX_VIRTUAL// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CClockDlg dialogCClockDlg::CClockDlg(CWnd* pParent /*=NULL*/)
: CDialog(CClockDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CClockDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}void CClockDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CClockDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CClockDlg, CDialog)
//{{AFX_MSG_MAP(CClockDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_WM_LBUTTONDBLCLK()
ON_WM_TIMER()
ON_WM_CLOSE()
ON_WM_RBUTTONUP()
ON_COMMAND(MENU_EXIT, OnExit)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

Answer 7

谢谢大家，
 XunBaian(蓝水晶)， 你的程序擦除好像有问题呀？

Answer 8

上面的没贴完，说不准超过三次，下面继续：
/////////////////////////////////////////////////////////////////////////////
// CClockDlg message handlersBOOL CClockDlg::OnInitDialog()
{
CDialog::OnInitDialog(); // Add "About..." menu item to system menu. // IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
} // Set the icon for this dialog.  The framework does this automatically
//  when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon // TODO: Add extra initialization here
GetWindowRect(wndRect);
wndRect.top=50;
wndRect.bottom=550;
wndRect.left=100;
wndRect.right=600;
MoveWindow(wndRect);
GetClientRect(wndRect);
CRgn hRgn;
hRgn.CreateEllipticRgn(wndRect.left,wndRect.top,wndRect.right,wndRect.bottom);
SetWindowRgn(hRgn,TRUE);
SetTimer(1,1000,NULL);
return TRUE;  // return TRUE  unless you set the focus to a control
}void CClockDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDialog dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.
void CClockDlg::OnPaint() 
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); // Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CPen CirClePen(PS_SOLID,1,RGB(255,255,255));
CPen PointPen(PS_SOLID,3,RGB(255,200,255));
CPen ScalePen(PS_SOLID,5,RGB(255,125,255));
CPen *pOldPen;
CBrush MyBrush(RGB(0,0,0));
CBrush *pOldBrush;
CRect CirCleRect;
CDC *pDC=GetDC();
CirCleRect=wndRect;
pOldBrush=pDC->SelectObject(&MyBrush);
pDC->Ellipse(CirCleRect);
pOldPen=pDC->SelectObject(&CirClePen);
CPoint CentrePoint,NewPoint;
float r;
CentrePoint=CirCleRect.CenterPoint();
r=CirCleRect.Width()/2;
for(int i=0;i<360;i++)
{
if (i%15==0)
{
pDC->SelectObject(&ScalePen);
}
else if (i%5==0)
{
pDC->SelectObject(&PointPen);
}
else
{
pDC->SelectObject(&CirClePen);
}
if(i%5==0)
{
NewPoint.x=CentrePoint.x+r*0.85*sin(PI*i/30);
NewPoint.y=CentrePoint.y-r*0.85*cos(PI*i/30);
pDC->MoveTo(NewPoint);
}
else
{
NewPoint.x=CentrePoint.x+r*0.9*sin(PI*i/30);
NewPoint.y=CentrePoint.y-r*0.9*cos(PI*i/30);
pDC->MoveTo(NewPoint);
}
NewPoint.x=CentrePoint.x+r*sin(PI*i/30);
NewPoint.y=CentrePoint.y-r*cos(PI*i/30);
pDC->LineTo(NewPoint);
}
pDC->SelectObject(pOldPen);
pDC->SelectObject(pOldBrush);
ReleaseDC(pDC);
CClockDlg::OnTimer(1); CDialog::OnPaint();
}
}// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CClockDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}void CClockDlg::OnLButtonDblClk(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default
CDialog::OnOK();
CDialog::OnLButtonDblClk(nFlags, point);
}void CClockDlg::OnTimer(UINT nIDEvent) 
{
// TODO: Add your message handler code here and/or call default
if(nIDEvent==1)
{
CPoint NewPoint,CentrePoint=wndRect.CenterPoint();
CTime time;
time=CTime::GetCurrentTime();
CDC *pDC=GetDC();
//时间指针
int iH=time.GetHour();
int iM=time.GetMinute();
int iS=time.GetSecond();
int r=wndRect.Width()/2;
static int iiH,iiM,iiS;
iH=iH*60*60+iM*60+iS;
iM=iM*60+iS;

//时针，擦去前次时针
CPen *OldPen,HourPen(PS_SOLID,8,RGB(255,0,255)),OldHourPen(PS_SOLID,8,RGB(0,0,0));
OldPen=pDC->SelectObject(&OldHourPen);
NewPoint.x=CentrePoint.x-0.1*r*sin(PI*iiH/21600);
NewPoint.y=CentrePoint.y+0.1*r*cos(PI*iiH/21600);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.4*r*sin(PI*iiH/21600);
NewPoint.y=CentrePoint.y-0.4*r*cos(PI*iiH/21600);
iiH=iH;
pDC->LineTo(NewPoint);
//分针，擦去前次分针
CPen MinutePen(PS_SOLID,6,RGB(255,255,0)),OldMinutePen(PS_SOLID,6,RGB(0,0,0));
pDC->SelectObject(&OldMinutePen);
NewPoint.x=CentrePoint.x-0.2*r*sin(PI*iiM/1800);
NewPoint.y=CentrePoint.y+0.2*r*cos(PI*iiM/1800);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.6*r*sin(PI*iiM/1800);
NewPoint.y=CentrePoint.y-0.6*r*cos(PI*iiM/1800);
iiM=iM;
pDC->LineTo(NewPoint);
//秒针，擦去前次秒针
CPen SecondPen(PS_SOLID,2,RGB(255,0,0)),OldSecondPen(PS_SOLID,2,RGB(0,0,0));
pDC->SelectObject(&OldSecondPen);
NewPoint.x=CentrePoint.x-0.3*r*sin(PI*iiS/30);
NewPoint.y=CentrePoint.y+0.3*r*cos(PI*iiS/30);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.8*r*sin(PI*iiS/30);
NewPoint.y=CentrePoint.y-0.8*r*cos(PI*iiS/30);
iiS=iS;
pDC->LineTo(NewPoint);
//数字日期时间
CString strTime;
strTime=time.Format("%Y年%m月%d日 %H:%M:%S %A");
pDC->SetBkColor(RGB(0,0,0));
pDC->SetTextColor(RGB(200,255,255));
pDC->TextOut(wndRect.CenterPoint().x-100,wndRect.CenterPoint().y*1.35,strTime);
//时针
pDC->SelectObject(&HourPen);
NewPoint.x=CentrePoint.x-0.1*r*sin(PI*iH/21600);
NewPoint.y=CentrePoint.y+0.1*r*cos(PI*iH/21600);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.4*r*sin(PI*iH/21600);
NewPoint.y=CentrePoint.y-0.4*r*cos(PI*iH/21600);
pDC->LineTo(NewPoint);
//分针
pDC->SelectObject(&MinutePen);
NewPoint.x=CentrePoint.x-0.2*r*sin(PI*iM/1800);
NewPoint.y=CentrePoint.y+0.2*r*cos(PI*iM/1800);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.6*r*sin(PI*iM/1800);
NewPoint.y=CentrePoint.y-0.6*r*cos(PI*iM/1800);
pDC->LineTo(NewPoint);
//秒针
pDC->SelectObject(&SecondPen);
NewPoint.x=CentrePoint.x-0.3*r*sin(PI*iS/30);
NewPoint.y=CentrePoint.y+0.3*r*cos(PI*iS/30);
pDC->MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.8*r*sin(PI*iS/30);
NewPoint.y=CentrePoint.y-0.8*r*cos(PI*iS/30);
pDC->LineTo(NewPoint);
//中心柱
CRect CentreRect;
CPen CentrePen(PS_SOLID,5,RGB(255,0,0));
CBrush CentreBrush(RGB(100,100,0));
pDC->SelectObject(&CentreBrush);
pDC->SelectObject(&CentrePen);
CentreRect.left=wndRect.CenterPoint().x-8;
CentreRect.top=wndRect.CenterPoint().y-8;
CentreRect.right=wndRect.CenterPoint().x+8;
CentreRect.bottom=wndRect.CenterPoint().y+8;
pDC->Ellipse(CentreRect);

pDC->SelectObject(OldPen);
ReleaseDC(pDC);
}
CDialog::OnTimer(nIDEvent);
}void CClockDlg::OnClose() 
{
// TODO: Add your message handler code here and/or call default
KillTimer(1);
CDialog::OnClose();
}void CClockDlg::OnRButtonUp(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default
CMenu menu;
VERIFY(menu.LoadMenu(IDR_MENU1));
CMenu* pPopup = menu.GetSubMenu(0);
ASSERT(pPopup != NULL);
pPopup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, AfxGetMainWnd());
CDialog::OnRButtonUp(nFlags, point);
}void CClockDlg::OnExit() 
{
// TODO: Add your command handler code here
CClockDlg::OnOK();
}

Answer 9

to XunBaian(蓝水晶) 
在ontimer里只需调用一下 invalidate()即可呀.

Answer 10

我都说了很难为情的，那是我的第一个VC程序，刚接触VC时写的，什么也不懂，当时只注重界面上有一个针在动就行了，代码方面我也知道很糟，对楼主的唯一可取之处是sin和cos在这里怎么用的，看让指针转动的思路就行了，千万不要看实现方法。

Answer 11

在OnTimer里调用invalidate()，闪得很历害啊，几乎看不清了。

Answer 12

只需把你的代码改成如下即可呀:效果还可以.
void CWatchDlg::OnPaint() 
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); // Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
// CDialog::OnPaint();
CPoint NewPoint,CentrePoint=wndRect.CenterPoint();
CTime time;
time=CTime::GetCurrentTime();
CPaintDC dc(this);
CDC MemDC;
MemDC.CreateCompatibleDC(&dc);
CBitmap MemBitmap;
CBitmap *pMemBitmapBak = NULL;
MemBitmap.CreateCompatibleBitmap(&dc, wndRect.Width(), wndRect.Height());
pMemBitmapBak = MemDC.SelectObject(&MemBitmap);
//时间指针
int iH=time.GetHour();
int iM=time.GetMinute();
int iS=time.GetSecond();
int r=wndRect.Width()/2;
static int iiH,iiM,iiS;
iH=iH*60*60+iM*60+iS;
iM=iM*60+iS;

//时针，擦去前次时针
CPen *OldPen,HourPen(PS_SOLID,8,RGB(255,0,255)),OldHourPen(PS_SOLID,8,RGB(0,0,0));
OldPen=MemDC.SelectObject(&OldHourPen);
NewPoint.x=CentrePoint.x-0.1*r*sin(PI*iiH/21600);
NewPoint.y=CentrePoint.y+0.1*r*cos(PI*iiH/21600);
MemDC.MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.4*r*sin(PI*iiH/21600);
NewPoint.y=CentrePoint.y-0.4*r*cos(PI*iiH/21600);
iiH=iH;
MemDC.LineTo(NewPoint);
//分针，擦去前次分针
CPen MinutePen(PS_SOLID,6,RGB(255,255,0)),OldMinutePen(PS_SOLID,6,RGB(0,0,0));
MemDC.SelectObject(&OldMinutePen);
NewPoint.x=CentrePoint.x-0.2*r*sin(PI*iiM/1800);
NewPoint.y=CentrePoint.y+0.2*r*cos(PI*iiM/1800);
MemDC.MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.6*r*sin(PI*iiM/1800);
NewPoint.y=CentrePoint.y-0.6*r*cos(PI*iiM/1800);
iiM=iM;
MemDC.LineTo(NewPoint);
//秒针，擦去前次秒针
CPen SecondPen(PS_SOLID,2,RGB(255,0,0)),OldSecondPen(PS_SOLID,2,RGB(0,0,0));
MemDC.SelectObject(&OldSecondPen);
NewPoint.x=CentrePoint.x-0.3*r*sin(PI*iiS/30);
NewPoint.y=CentrePoint.y+0.3*r*cos(PI*iiS/30);
MemDC.MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.8*r*sin(PI*iiS/30);
NewPoint.y=CentrePoint.y-0.8*r*cos(PI*iiS/30);
iiS=iS;
MemDC.LineTo(NewPoint);
//数字日期时间
CString strTime;
strTime=time.Format("%Y年%m月%d日 %H:%M:%S %A");
MemDC.SetBkColor(RGB(0,0,0));
MemDC.SetTextColor(RGB(200,255,255));
MemDC.TextOut(wndRect.CenterPoint().x-100,wndRect.CenterPoint().y*1.35,strTime);
//时针
MemDC.SelectObject(&HourPen);
NewPoint.x=CentrePoint.x-0.1*r*sin(PI*iH/21600);
NewPoint.y=CentrePoint.y+0.1*r*cos(PI*iH/21600);
MemDC.MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.4*r*sin(PI*iH/21600);
NewPoint.y=CentrePoint.y-0.4*r*cos(PI*iH/21600);
MemDC.LineTo(NewPoint);
//分针
MemDC.SelectObject(&MinutePen);
NewPoint.x=CentrePoint.x-0.2*r*sin(PI*iM/1800);
NewPoint.y=CentrePoint.y+0.2*r*cos(PI*iM/1800);
MemDC.MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.6*r*sin(PI*iM/1800);
NewPoint.y=CentrePoint.y-0.6*r*cos(PI*iM/1800);
MemDC.LineTo(NewPoint);
//秒针
MemDC.SelectObject(&SecondPen);
NewPoint.x=CentrePoint.x-0.3*r*sin(PI*iS/30);
NewPoint.y=CentrePoint.y+0.3*r*cos(PI*iS/30);
MemDC.MoveTo(NewPoint);
NewPoint.x=CentrePoint.x+0.8*r*sin(PI*iS/30);
NewPoint.y=CentrePoint.y-0.8*r*cos(PI*iS/30);
MemDC.LineTo(NewPoint);
//中心柱
CRect CentreRect;
CPen CentrePen(PS_SOLID,5,RGB(255,0,0));
CBrush CentreBrush(RGB(100,100,0));
MemDC.SelectObject(&CentreBrush);
MemDC.SelectObject(&CentrePen);
CentreRect.left=wndRect.CenterPoint().x-8;
CentreRect.top=wndRect.CenterPoint().y-8;
CentreRect.right=wndRect.CenterPoint().x+8;
CentreRect.bottom=wndRect.CenterPoint().y+8;
MemDC.Ellipse(CentreRect);

dc.BitBlt(0, 0, wndRect.Width(),wndRect.Height(), &MemDC, 0, 0, SRCCOPY);
MemDC.SelectObject(OldPen);
}
}void CWatchDlg::OnTimer(UINT nIDEvent) 
{
if ( nIDEvent == 1)
Invalidate();
}
//其他不变.

Answer 13

改了之后，还是每隔约2-３秒会闪一次，我原来一点也不会闪的，但这不失为一个好方法，使我以后又多了一条思路，谢谢anyiflyer(燕子飞了,我爱谁?为了我们青春的纪念!!!)