mfc画波形函数

void CMyPicoTestDlg::DrawWave(CDC *pDC,CRect &rectPicture)
{
    float fDeltaX;
    float fDeltaY;
    int nX;
    int nY;
    CPen newPen;
    CPen *pOldPen;
    CBrush newBrush;
    CBrush *pOldBrush;

    fDeltaX=(float)rectPicture.Width()/(POINT_COUNT-);
    fDeltaY=(float)rectPicture.Height()/;

    newBrush.CreateSolidBrush(RGB(,,));

    pOldBrush=pDC->SelectObject(&newBrush);
    pDC->Rectangle(rectPicture);
    pDC->SelectObject(pOldBrush);
    newBrush.DeleteObject();

    newPen.CreatePen(PS_SOLID,,RGB(,,));
    pOldPen=pDC->SelectObject(&newPen);

    pDC->MoveTo(rectPicture.left,rectPicture.bottom);

    for (int i=;i<POINT_COUNT;i++)
    {
        nX=rectPicture.left+(int)(i*fDeltaX);
        nY=rectPicture.bottom-(int)(m_nzValue[i]*fDeltaY);
        pDC->MoveTo(nX,rectPicture.bottom);
        pDC->LineTo(nX,nY);

    }
    pDC->SelectObject(pOldPen);
    newPen.DeleteObject();
}