视频等比例显示和拉伸显示 ，视频中框的等比显示

拉伸显示情况

double fWidthRate = (double)m_nRealWidth / (double)rc.Width();
double fHeightRate = (double)m_nRealHeight / (double) rc.Height();

int nX = (double)x / fWidthRate;
int nY = (double)y / fHeightRate;
int nWidth = (double)width / fWidthRate;
int nHeight = (double) height / fHeightRate;

if(nX < 0) nX = 0;
if(nY < 0) nY = 0;

CRect rect(nX,nY,nX+nWidth,nY+nHeight);  //在显示框中 显示用户选择的框


等比例显示
int nMinLenght = m_nRealHeight;
int nWidthTemp  = 0.nHeightTemp =0;
if(rc.width()/ rc.Height() > = m_nRealWidth / m_nRealHeight)
{
 nWidthTemp = (m_nRealWidth * rc.Height()) / m_nRealHeight;
nHeightTemp = rc.Height();

}
else
{
nWidthTemp = rc.width();
nHeightTemp = rc.Width()*m_nRealHeight / m_nRealWidth;

}
int nX = x * nWidthTemp /m_nRealWidht;
int nY  = y * nHeightTemp / m_nRealHeight;
int nWidth = width * nWidthTemp / m_nRealWidth;
int nHeight = height * nHeightTemp / m_nRealHeight;

if(nX < 0)  nX =0;
if(nY < 0)  nY =0;

CRect rect(nX,nY,nX+nWidth,nY + nHeight);