[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 () % 12;

    CString strWndClass = AfxRegisterWndClass (
        CS_HREDRAW | CS_VREDRAW,
        myApp.LoadStandardCursor (IDC_ARROW),
        (HBRUSH) (COLOR_3DFACE + 1),
        NULL
    );

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


int CMainWindow::OnCreate (LPCREATESTRUCT lpcs)
{
    if (CFrameWnd::OnCreate (lpcs) == -1)
        return -1;

    //
    // Set a timer to fire at 1-second intervals.
    //
    if (!SetTimer (ID_TIMER_CLOCK, 1000, NULL)) {
        MessageBox (_T ("SetTimer failed"), _T ("Error"),
            MB_ICONSTOP | MB_OK);
        return -1;
    }

    return 0;
}

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 () % 12;

    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 (1000, 1000);
    dc.SetViewportExt (rect.Width (), -rect.Height ());
    dc.SetViewportOrg (rect.Width () / 2, rect.Height () / 2);

    //
    // 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(-5000,5000,5000,-5000);
        CBrush brush(clrColor);
        CBrush* pOldBrush=dc.SelectObject(&brush);
        dc.Rectangle(rect);
        dc.SelectObject(pOldBrush);
        Draw(&dc,miaoL, nSecond * 6, RGB (255, 0, 0));//每秒走6度
        Draw(&dc,shiL, (nHour * 30) + (nMinute / 2),//每小时30度+每分钟0.5度
            RGB (0, 0, 255));
        Draw(&dc, fenL,  nMinute * 6, RGB (0, 255, 0));//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 (1000, 1000);
    dc.SetViewportExt (rect.Width (), -rect.Height ());
    dc.SetViewportOrg (rect.Width () / 2, rect.Height () / 2);
    
    //画上钟面+时分秒针
    Draw(&dc,shiL, (m_nPrevHour * 30) +
        (m_nPrevMinute / 2), RGB (0, 0, 255));
    Draw(&dc,fenL, m_nPrevMinute * 6, RGB (0, 255, 0));
    Draw(&dc,miaoL, m_nPrevSecond * 6, RGB (255, 0, 0));

    COLORREF clrColor = ::GetSysColor (COLOR_3DFACE);

}



//画秒针
void CMainWindow::Draw (CDC* pDC, int nLength ,
    int nDegrees, COLORREF clrColor)
{
    CPoint point[2];
    CRect rect(-(nLength+kuan),(nLength+kuan),(nLength+kuan),-(nLength+kuan));

    double nRadians = (double) nDegrees * 0.017453292;//转化为弧度制
    
    point[0].x = 0;
    point[0].y = 900;
    point[1].x = (int) ((nLength+600) * sin (nRadians));//注意转换（坐标系变换）
    point[1].y = (int) ((nLength+600) * cos (nRadians));

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

    pDC->Arc(rect,point[1],point[0]);

    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 * 30) + (m_nPrevMinute / 2),//每小时30度+每分钟0.5度
            RGB (0, 0, 255));
    Draw(pDC, fenL,  m_nPrevMinute * 6, RGB (0, 255, 0));//每分钟6度
    pDC->SelectObject (pOldPen);
    pDC->SelectObject (pOldBrush);
}