我按书上做一个指针式时钟, B04View.cpp 的代码如下,
// B04View.cpp : implementation of the CB04View class
//

#include "stdafx.h"

#include "B04.h"
#include "math.h"

#include "B04Doc.h"
#include "B04View.h"


#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CB04View

IMPLEMENT_DYNCREATE(CB04View, CView)

BEGIN_MESSAGE_MAP(CB04View, CView)
    //{{AFX_MSG_MAP(CB04View)
    ON_WM_TIMER()
    ON_WM_CREATE()
    //}}AFX_MSG_MAP
    // Standard printing commands
    ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
    ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
    ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CB04View construction/destruction

CB04View::CB04View()
{
    // TODO: add construction code here

}

CB04View::~CB04View()
{
}

BOOL CB04View::PreCreateWindow(CREATESTRUCT& cs)
{
    // TODO: Modify the Window class or styles here by modifying
    //  the CREATESTRUCT cs

    return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CB04View drawing

void CB04View::OnDraw(CDC* pDC)
{
    CB04Doc* pDoc = GetDocument();
    ASSERT_VALID(pDoc);
    // TODO: add draw code for native data here
    RECT Rect;
    GetClientRect(&Rect);
    int CenterX=Rect.right/2;
    int CenterY=Rect.bottom/2;
    CTime Time=CTime::GetCurrentTime();
    CString str;
    int i,x,y;
    CSize size;
    CPen Pen(PS_SOLID,5,RGB(255,255,0));
    CPen *OldPen=pDC->SelectObject(&Pen);
    pDC->Ellipse(5,5,Rect.right-5,Rect.bottom-5);
    double Radians;
    pDC->SetTextColor(RGB(255,0,0));
    for(i=1;i<=12;i++)
    {
        str.Format("%d",i);
        size=pDC->GetTextExtent(str,str.GetLength());
        Radians=(double)i*6.28/12.0;
        x=CenterX-(size.cx/2)+(int)((double)(CenterX-20)*sin(Radians));
        y=CenterY-(size.cy/2)+(int)((double)(CenterY-20)*cos(Radians));
        pDC->TextOut(x,y,str);

    }
    Radians=(double)Time.GetHour()+(double)Time.GetMinute()/60.0+(double)Time.GetSecond()/3600.0;
    Radians*=6.28/12.0;
    CPen HourPen(PS_SOLID,5,RGB(0,255,0));
    pDC->SelectObject(&HourPen);
    pDC->MoveTo(CenterX,CenterY);
    pDC->LineTo(CenterX+(int)((double)(CenterX/3)*sin(Radians)),CenterY-(int)((double)(CenterY/3)*cos(Radians)));
    Radians=(double)Time.GetMinute()+(double)Time.GetSecond()/60.0;
    Radians*=6.28/60.0;
    CPen MinutePen(PS_SOLID,3,RGB(0,0,255));
    pDC->SelectObject(&MinutePen);
    pDC->MoveTo(CenterX,CenterY);
    pDC->LineTo(CenterX+(int)((double)(CenterX*2)/3*sin(Radians),CenterY-(int)((double)(CenterY*2)/3*cos(Radians))));
    Radians=(double)Time.GetSecond();
    Radians*=6.28/60.0;
    CPen SecondPen(PS_SOLID,1,RGB(0,255,255));
    pDC->SelectObject(&SecondPen);
    
    pDC->MoveTo(CenterX,CenterY);
    pDC->LineTo(CenterX+(int)((double)(CenterX*4)/5)*sin(Radians),CenterY-(int)((double)(CenterY*4)/5*cos(Radians)));
    pDC->SelectObject(OldPen);


}

/////////////////////////////////////////////////////////////////////////////
// CB04View printing

BOOL CB04View::OnPreparePrinting(CPrintInfo* pInfo)
{
    // default preparation
    return DoPreparePrinting(pInfo);
}

void CB04View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
    // TODO: add extra initialization before printing
}

void CB04View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
    // TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CB04View diagnostics

#ifdef _DEBUG
void CB04View::AssertValid() const
{
    CView::AssertValid();
}

void CB04View::Dump(CDumpContext& dc) const
{
    CView::Dump(dc);
}

CB04Doc* CB04View::GetDocument() // non-debug version is inline
{
    ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CB04Doc)));
    return (CB04Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CB04View message handlers

void CB04View::OnTimer(UINT nIDEvent) 
{
    // TODO: Add your message handler code here and/or call default
    InvalidateRect(NULL,true);
    UpdateWindow();
    CView::OnTimer(nIDEvent);
}

int CB04View::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
    if (CView::OnCreate(lpCreateStruct) == -1)
        return -1;
    
    // TODO: Add your specialized creation code here
    SetTimer(1,1000,NULL);
    
    return 0;
}

在调试时,显示出错的代码段为:
    pDC->LineTo(CenterX+(int)((double)(CenterX*2)/3*sin(Radians),CenterY-(int)((double)(CenterY*2)/3*cos(Radians))));
   它的调试错误为:
  E:\aa\B04\B04View.cpp(97) : error C2664: 'int __thiscall CDC::LineTo(struct tagPOINT)' : cannot convert parameter 1 from 'int' to 'struct tagPOINT'
        No constructor could take the source type, or constructor overload resolution was ambiguous

   请问下各位高手,如何解决?