MFC图像缩放时使滚动条最大值根据图像高宽进行变换。

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void CChildView::ResetScrollBar(int cx, int cy)
{
    CConfiguration* pCofig = CConfiguration::GetInstance();
    // 缩放最大最小比例
    double minScale = pCofig->GetMinScale();//0.6;
    double maxScale = pCofig->GetMaxScale();//2.0;
    // 显示的长宽
    double viewHeight = m_pDrawManager->GetAllTableSizeHeight();//m_pDrawManager->GetChannelNum()*230+10;
    double viewWidth = m_pDrawManager->GetAllTableSizeWidth();//1205;
    // 缩放系数 
    double yScale = cy/viewHeight;
    double xScale = (cx-emDrawManagerPosX)/viewWidth;
 
    double scale = 1.0;
    if (abs(xScale) > abs(yScale))
    {
        scale = xScale;
    }
    else
    {
        scale = yScale;
    }
    if (scale < minScale)
    {
        scale = minScale;
    }
    else if (scale > maxScale)
    {
        scale = maxScale;
    }
    m_pDrawManager->SetScaleFactor(scale);
 
    int tpos = 0;
    SCROLLINFO svc;
    GetScrollInfo(SB_VERT, &svc);
    tpos = svc.nPos;
    svc.fMask = SIF_ALL;
    svc.nMax = (int)(viewHeight*scale);
    svc.nMin = 0;
    svc.nPage = cy;
    svc.nPos = (int)(tpos*scale);
    SetScrollInfo(SB_VERT, &svc, TRUE);
 
    SCROLLINFO shc;
    GetScrollInfo(SB_HORZ, &shc);
    tpos = shc.nPos;
    shc.fMask = SIF_ALL;
    shc.nMax = (int)(viewWidth*scale);
    shc.nMin = 0;
    shc.nPage = cx;
    shc.nPos = (int)(tpos*scale);
    SetScrollInfo(SB_HORZ, &shc, TRUE);
}