3>(x1>x2?x1:x2)?x3:(x1>x2?x1:x2);
 maxWidth = maxWidth>0?maxWidth:0;
 maxHeight = y3>(y1>y2?y1:y2)?y3:(y1>y2?y1:y2);
 maxHeight = maxHeight>0?maxHeight:0;
 DstWidth = maxWidth - minWidth;
    DstHeight = maxHeight - minHeight;
 dcDst = CreateCompatibleDC(dcSrc);
 newBitmap = CreateCompatibleBitmap(dcSrc,(int)DstWidth,(int)DstHeight);
 SelectObject(dcDst,newBitmap);
 for( int I = 0 ;I<DstHeight;I++)
 {
    for(int J = 0 ;J< DstWidth;J++)
    {
       srcX = (J + minWidth) * cosA + (I + minHeight) * sinA;
       srcY = (I + minHeight) * cosA - (J + minWidth) * sinA;
       if( (srcX >= 0) && (srcX <= SrcWidth) &&(srcY >= 0) && (srcY <= SrcHeight))
      {
              BitBlt(dcDst, J, I, 1, 1, dcSrc,(int)srcX, (int)srcY, SRCCOPY);
      }
   }
 }

   //显示旋转后的位图

   BitBlt(hDC,200,200,(int)DstWidth,(int)DstHeight,dcDst,0,0,SRCCOPY);

   DeleteObject(newBitmap);

   DeleteDC(dcDst);

}

      最后我们调用就可以了:

      double angle = (45/180.0)*3.14159;//旋转45Degree,可为任意角度

      RotateAnyAngle(dcSrc,bmpWidth,bmpHeight,angle,);

     到这里就大功告成了.