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l º­ÊýÖеĵÚÒ»¸ö²ÎÊýrcScreenΪͼÏñÒª±»ÏÔʾµÄ¾ØÐδóС£¬µÚ¶þ¸ö²ÎÊýsizePictureΪͼÏñ×ÔÉí´óС£¬µÚÈý¸ö²ÎÊýbCenterΪÊÇ·ñ¾ÓÖÐÏÔʾ£¬·µ»ØÖµCRect¼ÈΪͼÏñ×î¼ÑÏÔʾ´óС¡£
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CRect RectSizeWithConstantRatio( CRect* rcScreen,
                                       CSize sizePicture,
                                       BOOL bCenter)
{
  CRect rect(rcScreen);
  double dWidth = rcScreen->Width();
  double dHeight = rcScreen->Height();
  double dAspectRatio = dWidth/dHeight;

  double dPictureWidth = sizePicture.cx;
  double dPictureHeight = sizePicture.cy;
  double dPictureAspectRatio = dPictureWidth/dPictureHeight;

  //If the aspect ratios are the same then the screen rectangle
  // will do, otherwise we need to calculate the new rectangle

  if (dPictureAspectRatio > dAspectRatio)
  {
    int nNewHeight = (int)(dWidth/dPictureWidth*dPictureHeight);
    int nCenteringFactor = (rcScreen->Height() - nNewHeight) / 2;
    rect.SetRect( 0,
                  nCenteringFactor,
                  (int)dWidth,
                  nNewHeight + nCenteringFactor);

  }
  else if (dPictureAspectRatio < dAspectRatio)
  {
    int nNewWidth =  (int)(dHeight/dPictureHeight*dPictureWidth);
    int nCenteringFactor = (rcScreen->Width() - nNewWidth) / 2;
    rect.SetRect( nCenteringFactor,  
                  0,
                  nNewWidth + nCenteringFactor,
                  (int)(dHeight));
  }

  return rect;
};

[ Last edited by »ÃÓ°ÎÞºÛ on 2006-11-17 at 08:19 ]
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