VC图象旋转算法

//图形旋转的C语言源程序    
   
   
#include<stdlib.h>    
#include<stdio.h>    
#include<graphics.h>    
#include<alloc.h>    
#include<ctype.h>    
   
int load_cut(char *fname);   
int load_convolution_matrix(char *fname);   
int convolve_image(void);   
int swap_pictures(void);   
   
int minx,maxx,miny,maxy;   
int LOADPAGE=0;   
int ENHANCEPAGE=1;   
int *cmat, *pmat, *vmat;   
int cmx,cmy,cmnum;   
   
struct palettetype palette,newpal;   
int driver,mode;   
   
int cleancut=-1;   
   
int init_graphics(void)   
{   
driver=DETECT; mode=0;   
detectgraph(&driver,&mode);   
if(driver==VGA) mode=VGAMED;   

initgraph(&driver,&mode,"");   
getpalette(&palette);   
getpalette(&newpal);   
}   
   
int cleanup_image(void)   
{   
int i,j,num,x,y,k;   
   
if(cleancut<0) return;   
setactivepage(LOADPAGE);   
setvisualpage(ENHANCEPAGE);   
for(x=minx;x<maxx;x++) {   
for(y=miny;y<maxy;y++) {   
if(getpixel(x,y)!=0) num=-1;   
else num=0;   
for(j=-1;j<2;j++) {   
for(i=-1;i<2;i++) {   
if(getpixel(x+i,y+j)!=0) num++;   
}   
}   
if(num>cleancut) {   
k=getpixel(x,y);   
setactivepage(ENHANCEPAGE);   
putpixel(x,y,k);   
setactivepage(LOADPAGE);   
}   
}   
}   
k=ENHANCEPAGE; ENHANCEPAGE=LOADPAGE; LOADPAGE=k;