VC6.0图形处理5--几何变换

源码下载：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);

}