VC6.0图形处理5--几何变换

蔚落 2022-06-18 01:39 179阅读 0赞

源码下载：[http://download.csdn.net/detail/renshengrumenglibing/3875522][http_download.csdn.net_detail_renshengrumenglibing_3875522]

//注意如何申请新的存储空间，存放处理后的图片，并利用memcpy，将数据copy给原来存储图像的结构

void CBMPViewerDoc::OnMenuitem32788() //缩小变换

\{  
// TODO: Add your command handler code here  
int linewidth;  
linewidth=(pbi->bmiHeader.biWidth\*pbi->bmiHeader.biBitCount+31)/32\*4;  
int i0 , j0;  
double ratio = 0.5;

//申请存储空间，并返回指针给lpTemp

> HLOCAL hTemp;

hTemp = LocalAlloc(LHND ,linewidth \* bi.biHeight );  
LPSTR lpTemp;

lpTemp = (char\*)LocalLock(hTemp);

unsigned char \*lpScr;  
unsigned char \* lpDest;  
// TODO: Add your command handler code here  
for(int i = 0 ; i< bi.biHeight ; i++)\{  
for(int j = 0 ; j< bi.biWidth ; j++)\{  
lpDest = (unsigned char \*)lpTemp+linewidth\*(bi.biHeight - i -1) + j;  
  i0 = (LONG)(i /ratio +0.5);  
  j0 = (LONG)(j /ratio + 0.5);  
  if((i0 >= 0) && (i0 < bi.biHeight)&&(j0 >= 0 ) && (j0 < bi.biWidth))\{  
  lpScr = (unsigned char \*)lpBuf+linewidth\*(bi.biHeight - i0 -1) + j0;  
\*lpDest = \*lpScr;  
  \}  
    
  else \{  
\*lpDest = 255;     
\}  
\}  
  
\}  
memcpy(lpBuf, lpTemp, linewidth \* bi.biHeight);  
// Invalidata(TRUE);  
UpdateAllViews(NULL,0,NULL);  
  
\}  
  
  
void CBMPViewerDoc::OnMenuitem32789() //放大变换  
//只能实现图像区域不变的放大，还不能改变图像的大小  
\{  
// TODO: Add your command handler code here  
  
  
int linewidth;  
linewidth=(pbi->bmiHeader.biWidth\*pbi->bmiHeader.biBitCount+31)/32\*4;  
int i0 , j0;  
double ratio = 2; //放大倍数  
HLOCAL hTemp;  
hTemp = LocalAlloc(LHND ,linewidth \* bi.biHeight );  
  
LPSTR lpTemp;  
lpTemp = (char\*)LocalLock(hTemp);  
unsigned char \*lpScr;  
unsigned char \* lpDest;  
// TODO: Add your command handler code here  
for(int i = 0 ; i< bi.biHeight ; i++)\{  
for(int j = 0 ; j< bi.biWidth ; j++)\{  
lpDest = (unsigned char \*)lpTemp+linewidth\*(bi.biHeight - i -1) + j;  
i0 = (LONG)(i /ratio +0.5);  
j0 = (LONG)(j /ratio + 0.5);  
if((i0 >= 0) && (i0 < bi.biHeight)&&(j0 >= 0 ) && (j0 < bi.biWidth))\{  
lpScr = (unsigned char \*)lpBuf+linewidth\*(bi.biHeight - i0 -1) + j0;  
\*lpDest = \*lpScr;  
\}  
  
else \{  
\*lpDest = 255;     
\}  
\}  
  
\}  
memcpy(lpBuf, lpTemp, linewidth \* bi.biHeight);  
// Invalidata(TRUE);  
UpdateAllViews(NULL,0,NULL);

void CBMPViewerDoc::OnMenuitem32784() //旋转变换  
\{  
// TODO: Add your command handler code here  
int linewidth;  
linewidth=(pbi->bmiHeader.biWidth\*pbi->bmiHeader.biBitCount+31)/32\*4;  
int i0 , j0;  
double RotateAngle = 15; //旋转角度  
  
    double piRotateAngle = RotateAngle \* PI/180;  
  
  
HLOCAL hTemp;  
hTemp = LocalAlloc(LHND ,linewidth \* bi.biHeight );  
  
LPSTR lpTemp;  
lpTemp = (char\*)LocalLock(hTemp);  
unsigned char \*lpScr;  
unsigned char \* lpDest;  
// TODO: Add your command handler code here  
for(int i = 0 ; i< bi.biHeight ; i++)\{  
for(int j = 0 ; j< bi.biWidth ; j++)\{  
lpDest = (unsigned char \*)lpTemp+linewidth\*(bi.biHeight - i -1) + j;  
  
i0 = (LONG)(cos(piRotateAngle) \* i- sin(piRotateAngle) \*j + 0.5);  
j0 = (LONG)(sin(piRotateAngle) \*i + cos(piRotateAngle) \* j +0.5);  
  
if((i0 >= 0) && (i0 < bi.biHeight)&&(j0 >= 0 ) && (j0 < bi.biWidth))\{  
lpScr = (unsigned char \*)lpBuf+linewidth\*(bi.biHeight - i0 -1) + j0;  
\*lpDest = \*lpScr;  
\}  
  
else \{  
\*lpDest = 255;    
\}  
\}  
  
\}  
memcpy(lpBuf, lpTemp, linewidth \* bi.biHeight);  
//Invalidata(TRUE);  
UpdateAllViews(NULL,0,NULL);  
\}

[http_download.csdn.net_detail_renshengrumenglibing_3875522]: http://download.csdn.net/detail/renshengrumenglibing/3875522