EVC位图旋转解决方案

EVC位图旋转
谁做过位图旋转啊？我的怎么老不实现啊？也不知道代码哪里有问题。
谁有方法啊？源代码更好啊。
我已经知道bmp图片旋转应该问题不大啊？
CClientDC     hDC(this);  

        double   x1,x2,x3;
double   y1,y2,y3;
double   maxWidth,maxHeight,minWidth,minHeight;
double   srcX,srcY;
double   sinA,cosA;
double   DstWidth;
double   DstHeight;
HDC   dcDst;//ÐýתºóµÄÄÚ´æÉ豸»·¾³
HBITMAP   newBitmap;
sinA   =   sin(angle);
cosA   =   cos(angle);
x1   =   -SrcHeight   *   sinA;
        y1   =   SrcHeight   *   cosA;
        x2   =   SrcWidth   *   cosA   -   SrcHeight   *   sinA;
        y2   =   SrcHeight   *   cosA   +   SrcWidth   *   sinA;
        x3   =   SrcWidth   *   cosA;
        y3   =   SrcWidth   *   sinA;
minWidth   =   x3> (x1> x2?x2:x1)?(x1> x2?x2:x1):x3;
minWidth   =   minWidth> 0?0:minWidth;
minHeight   =   y3> (y1> y2?y2:y1)?(y1> y2?y2:y1):y3;
minHeight   =   minHeight> 0?0:minHeight;
maxWidth   =   x3> (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);
}
}
}

//&Iuml;&Ocirc;&Ecirc;&frac34;&ETH;&yacute;×&ordf;&ordm;ó&micro;&Auml;&Icirc;&raquo;&Iacute;&frac14;

BitBlt(hDC,34,26,(int)DstWidth,(int)DstHeight,dcDst,0,0,SRCCOPY);

DeleteObject(newBitmap);

DeleteDC(dcDst);

哪里不对啊？
请各位大虾给点代码啊。谢谢

[解决办法]
用变换矩阵做很容易实现的。有变换公式你找一下就好了