📄 图形旋转的c语言源程序.htm
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i,j,k,nval;<BR>int *vx, *vy, *c;<BR>int
colmax,offset,end,midy;<BR>char
**lines=NULL;<BR>char *temp=NULL;</P>
<P>offset=-minx+(cmx/2);<BR>end=cmy-1;
midy=cmy/2;<BR>lines=(char
**)malloc(cmy*sizeof(char
*));<BR>for(i=0;i<cmy;i++) lines[i]=(char
*)malloc(sizeof(char)*(maxx-minx+cmx+1));<BR>setactivepage(LOADPAGE);<BR>for(j=-cmy/2;j<cmy/2;j++)
{<BR>for(i=minx-cmx/2;i<(maxx+cmx/2+1);i++)
{<BR>lines[j+midy][i+offset]=getpixel(i,j+miny);<BR>}<BR>}<BR>colmax=getmaxcolor();<BR>for(j=miny;j<maxy;j++)
{<BR>setactivepage(LOADPAGE);<BR>for(i=j+cmy/2,k=minx-cmx/2,nval=maxx+cmx/2;k<nval;k++)<BR>lines[end][k+offset]=getpixel(k,i);<BR>for(i=minx;i<maxx;i++)
{<BR>/* Load & multiply neighbors into matrix
*/<BR>setactivepage(LOADPAGE);<BR>vx=vmat;
vy=vmat+1; c=cmat;
nval=0;<BR>for(k=0;k<cmnum;k++) {<BR>if(*c)
nval+=
lines[(*vy)+midy][i+(*vx)+offset]*(*c);<BR>/*
if(*c) nval+= getpixel(i+(*vx),j+(*vy)) * (*c);
*/<BR>c++;<BR>vx+=2; vy+=2;<BR>}<BR>/* Cut off
values too high or too low */<BR>if(nval<0)
nval=0;<BR>if(nval>colmax) nval=colmax;<BR>/*
Place new pixel value
*/<BR>setactivepage(ENHANCEPAGE);<BR>putpixel(i,j,nval);<BR>}<BR>if(kbhit())
{ getch(); break; }<BR>/* rotate line pointers
*/<BR>temp=lines[0];<BR>for(i=1;i<cmy;i++)
lines[i-1]=lines[i];<BR>lines[end]=temp;<BR>}<BR>for(i=0;i<cmy;i++)
{<BR>if(lines[i]!=NULL)
free(lines[i]);<BR>}<BR>if(lines!=NULL)
{<BR>free(lines);<BR>}<BR>return;<BR>}</P>
<P>int build_offset_vectors(void)<BR>{<BR>int
*t;<BR>int il,im,jl,jm,i,j;</P>
<P>il=-cmx/2; im=cmx+il;<BR>jl=-cmy/2;
jm=cmy+jl;<BR>t=vmat;<BR>for(j=jl;j<jm;j++)
{<BR>for(i=il;i<im;i++) {<BR>*t++=i;
*t++=j;<BR>}<BR>}<BR>}</P>
<P>int load_convolution_matrix(char
*fname)<BR>{<BR>/* Layout of matrix file:<BR>#x
#y<BR>x0y0 x1y0 ... xny1<BR>.... .... ...
....<BR>x0ym x1ym ... xnym<BR>*/<BR>FILE
*mf;<BR>int *t;<BR>int i,j,im,jm;</P>
<P>if( (mf=fopen(fname,"rt"))==NULL )
{<BR>printf("Cannot load matrix
file.\n");<BR>abort();<BR>}<BR>fscanf(mf,"%d%d",&im,&jm);<BR>if(
(im&1)==0 || (jm&1)==0 )
{<BR>printf("Convolution matrix MUST have a center
point.\n");<BR>abort();<BR>}<BR>if( (cmat=(int
*)calloc(im*jm,sizeof(int)))==NULL )
{<BR>printf("Unable to calloc convolution
matrix.\n");<BR>abort();<BR>}<BR>if( (vmat=(int
*)calloc(2*im*jm,sizeof(int)))==NULL )
{<BR>printf("Unable to calloc offset vector
matrix.\n");<BR>abort();<BR>}<BR>cmx=im; cmy=jm;
cmnum=im*jm;<BR>t=cmat;<BR>for(j=0;j<jm;j++)
{<BR>for(i=0;i<im;i++) {<BR>if(
fscanf(mf,"%d",t++)!=1 ) {<BR>printf("Unable to
read
matrix.\n");<BR>abort();<BR>}<BR>}<BR>}<BR>fclose(mf);<BR>build_offset_vectors();<BR>}</P>
<P>int load_cut(char *fname)<BR>{<BR>static
unsigned char st[3000];<BR>char
*sp=st,*spend;<BR>int stp=0;<BR>int
width,height;<BR>FILE *fp;<BR>int
x,y,xl,yl;<BR>int i,n,len,d,j;</P>
<P>fp=fopen(fname,"rb");<BR>width=getw(fp);
height=getw(fp);<BR>xl=cmx; yl=cmy;<BR>minx=xl;
miny=yl;<BR>maxx=xl+width;
maxy=yl+height;<BR>if(maxy>(getmaxy()-cmy))
{<BR>maxy=getmaxy()-cmy;<BR>height=maxy-yl;<BR>}<BR>getw(fp);<BR>y=yl-1;<BR>for(sp=st,n=0;n<height;n++)
{<BR>stp=getw(fp);<BR>for(sp=st,spend=st+stp;sp<spend;)
*sp++=getc(fp);<BR>sp=st; spend=sp+stp; x=xl;
y++;<BR>while(sp<spend) {<BR>if(*((unsigned
char *)sp)>0x80) {<BR>len=(*sp++) &
0x7f;<BR>if(!(*sp)) { x+=len; continue;
}<BR>setcolor(*sp++);<BR>moveto(x,y);<BR>linerel(len,0);<BR>x+=len;<BR>continue;<BR>}
else {<BR>len=*sp++;<BR>for(j=0;j<len;j++)
putpixel(x++,y,*sp++);<BR>continue;<BR>}<BR>}<BR>}<BR>fclose(fp);<BR>}</P>
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<P align=center><FONT color=#3300cc>资料收集：beck
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