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   源码介绍

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DOS下设置显示器分辨率程序

#include <alloc.h>
#include <math.h>

#include "\vga\vgabase.h"
#include "\vga\xms.h"
#include "\vga\fillbase.h"

static double SIN45=0.707106781186548;

void VGABASE::setfillstyle(int fst)
{
FILL::setstyle(fst);
}

int VGABASE::getfillstyle(void)
{
return FILL::getstyle();
}

void VGABASE::setfillpattern(unsigned char *s)
{
FILL::setpattern(s);
}

void VGABASE::bar(int x1,int y1,int x2,int y2)
{
int i;
if(FILL::dataptr==0)
{
for(i=y1;i<=y2;i )
scanline(x1,x2,i);
}
else
{
for(i=y1;i<=y2;i )
FILL::scanlinestyle(x1,x2,i);
rectangle(x1,y1,x2,y2);
}
}

void VGABASE::polyfill(int n,int *border)
{
LFILL lfill(this);
lfill.poly(n,border);
lfill.draw();
}

void VGABASE::polyfill(int *border)
{
int n,i=0;
LFILL lf(this);
while(1) {
n=border[i];
if(n<=0)
break;
i ;
lf.poly(n,border i);
i = (n*2);
}
lf.draw();
}

void VGABASE::circlefill(int x0,int y0,int r)
{
int i;
long tn,x,y;
long xmax;
YFILL yfill(this,y0-r,y0 r);

y=r; x=0;
xmax=(double)r*SIN45;
tn=(1-r*2);
while(x<=xmax) {
if(tn>=0)
{
tn = ( 6 ((x-y)<<2) );
yfill.inspole(x0 x,y0 y);  // 6
yfill.inspole(x0-x,y0 y);  // 5
yfill.inspole(x0-x,y0-y);  // 2
yfill.inspole(x0 x,y0-y);  // 1
y--;
}
else
tn = ( (x<<2) 2 );
yfill.inspole(x0 y,y0 x);  // 7
yfill.inspole(x0-y,y0 x);  // 4
if(x>0)
{
yfill.inspole(x0-y,y0-x);  // 3
yfill.inspole(x0 y,y0-x);  // 0
}
x ;
}
yfill.supple();
yfill.draw();
}

void VGABASE::sectorfill(int x0,int y0,int r,int stangle,int endangle)
{
int i,j;
long tn,x,y;
long xmax;
int *xy;
int bx,ex,bxd,exd,bxf,exf,ly1,ly2;

bx=(stangle-1)/45;
if(bx<0) bx=7;
ex=endangle/45;
xy=(int *)calloc(4,2);
xy[0]=x0 (double)r*Lcos(stangle);
xy[1]=y0-(double)r*Lsin(stangle);
xy[2]=x0 (double)r*Lcos(endangle);
xy[3]=y0-(double)r*Lsin(endangle);

bxd=abs(y0-xy[1]);
exd=abs(y0-xy[3]);

if(bx==0||bx==1||bx==4||bx==5)
bxf=0;
else
bxf=1;
if(ex==0||ex==1||ex==4||ex==5)
exf=1;
else
exf=0;

if( (endangle>=90 && (stangle<=90||stangle>endangle)) ||
(endangle<90 && (stangle>endangle&&stangle<=90)) )
ly1=y0-r;
else
{
ly1=xy[1];
if(xy[3]<ly1)
ly1=xy[3];
}
if( (endangle>=270&&(stangle<=270||stangle>endangle)) ||
(endangle<270&&(stangle>endangle&&stangle<=270)) )
ly2=y0 r;
else
{
ly2=xy[3];
if(xy[1]>ly2)
ly2=xy[1];
}
YFILL yfill(this,ly1,ly2);

if( (xy[1]<=y0&&xy[0]>=x0) || (xy[1]>=y0&&xy[0]<=x0) )
yfill.inspole(xy[0],xy[1]);
else
{
yfill.inspole(xy[0],xy[1]);
yfill.inspole(xy[0],xy[1]);
}

if( (xy[3]<=y0&&xy[2]<=x0) || (xy[3]>=y0&&xy[2]>=x0) )
yfill.inspole(xy[2],xy[3]);
else
{
yfill.inspole(xy[2],xy[3]);
yfill.inspole(xy[2],xy[3]);
}

if( (xy[1]>y0&&xy[3]>y0) || (xy[1]<y0&&xy[3]<y0) )
{
yfill.inspole(x0,y0);
yfill.inspole(x0,y0);
}
else if( (xy[1]>=y0&&xy[3]<y0) || (xy[1]<y0&&xy[3]>=y0) )
yfill.inspole(x0,y0);

if(y0!=xy[1])
yfill.line(x0,y0,xy[0],xy[1]);
if(y0!=xy[3])
yfill.line(xy[2],xy[3],x0,y0);

y=r; x=0;
xmax=(double)r*SIN45;
tn=(1-r*2);
while(x<=xmax) {
if(tn>=0)
{
tn = ( 6 ((x-y)<<2) );
if( (ex>bx&&bx<6&&ex>6) || (endangle<stangle&&(bx<6||ex>6)) ||
(bx==6&&((y>bxd)^bxf)&&y!=bxd) || (ex==6&&((y>exd)^exf)&&y!=exd) )
yfill.inspole(x0 x,y0 y);  // 6
if( (ex>bx&&bx<5&&ex>5) || (endangle<stangle&&(bx<5||ex>5)) ||
(bx==5&&((y>bxd)^bxf)&&y!=bxd) || (ex==5&&((y>exd)^exf)&&y!=exd) )
yfill.inspole(x0-x,y0 y);  // 5
if( (ex>bx&&bx<2&&ex>2) || (endangle<stangle&&(bx<2||ex>2)) ||
(bx==2&&((y>bxd)^bxf)&&y!=bxd) || (ex==2&&((y>exd)^exf)&&y!=exd) )
yfill.inspole(x0-x,y0-y);  // 2
if( (ex>bx&&bx<1&&ex>1) || (endangle<stangle&&(bx<1||ex>1)) ||
(bx==1&&((y>bxd)^bxf)&&y!=bxd) || (ex==1&&((y>exd)^exf)&&y!=exd) )
yfill.inspole(x0 x,y0-y);  // 1
y--;
}
else
tn = ( (x<<2) 2 );
if( (ex>bx&&bx<7&&ex>7) || (endangle<stangle&&(bx<7||ex>7)) ||
(bx==7&&((x>bxd)^bxf)&&x!=bxd) || (ex==7&&((x>exd)^exf)&&x!=exd) )
yfill.inspole(x0 y,y0 x);  // 7
if( (ex>bx&&bx<4&&ex>4) || (endangle<stangle&&(bx<4||ex>4)) ||
(bx==4&&((x>bxd)^bxf)&&x!=bxd) || (ex==4&&((x>exd)^exf)&&x!=exd) )
yfill.inspole(x0-y,y0 x);  // 4
if(x>0)
{
if( (ex>bx&&bx<3&&ex>3) || (endangle<stangle&&(bx<3||ex>3)) ||
(bx==3&&((x>bxd)^bxf)&&x!=bxd) || (ex==3&&((x>exd)^exf)&&x!=exd) )
yfill.inspole(x0-y,y0-x);  // 3
if( (ex>bx&&bx<0&&ex>0) || (endangle<stangle&&(bx<0||ex>0)) ||
(bx==0&&((x>bxd)^bxf)&&x!=bxd) || (ex==0&&((x>exd)^exf)&&x!=exd) )
yfill.inspole(x0 y,y0-x);  // 0
}
x ;
}
yfill.supple();
yfill.draw();
free(xy);
}

void VGABASE::ellipsefill(int x0,int y0,long r1,long r2)
{
long r,xy,r12,r22;
int x,y,xmax,ymax;
long tn,ir12,ir22;

YFILL yfill(this,y0-r2,y0 r2);

x=0;y=r2;
r12=r1*r1;r22=r2*r2;ir12=r12;ir22=r22;
xmax=(double)r12/sqrt(r12 r22);
tn=r12-2*r2*r12;
while(x<=xmax) {
if(tn<0||y==0)
tn =(4*x 2)*ir22;
else
{
tn =(4*x 2)*ir22 (1-y)*4*ir12;
yfill.inspole(x0 x,y0 y);
yfill.inspole(x0-x,y0 y);
yfill.inspole(x0 x,y0-y);
yfill.inspole(x0-x,y0-y);
y--;
}
x ;
}
x--;
yfill.inspole(x0 x,y0 y);
yfill.inspole(x0-x,y0 y);
yfill.inspole(x0 x,y0-y);
yfill.inspole(x0-x,y0-y);

r=r1;r1=r2;r2=r;
x=0;y=r2;
r12=r1*r1;r22=r2*r2;ir12=r12;ir22=r22;
xmax=(int)( (double)r12/sqrt(r12 r22)-0.1);
tn=r12-2*r2*r12;
while(x<=xmax) {
if(tn<0||y==0)
tn =(4*x 2)*ir22;
else
{
tn =(4*x 2)*ir22 (1-y)*4*ir12;
y--;
}
yfill.inspole(x0 y,y0 x);
yfill.inspole(x0-y,y0 x);
if(x>0)
{
yfill.inspole(x0 y,y0-x);
yfill.inspole(x0-y,y0-x);
}
x ;
}
yfill.supple();
yfill.draw();
}

void VGABASE::fillarea(int x0,int y0,union COLOR bcolor)
{
int i,j,k,f;
static int fxy[8][2]={ {1,0},{1,-1},{0,-1},{-1,-1},
{-1,0},{-1,1},{0,1},{1,1}};
int *xx,*yy,x,y;
int ck,pk;
int n=0,maxxyn=4096;
LFILL lfill(this);

xx=(int *)calloc(maxxyn,2);
yy=(int *)calloc(maxxyn,2);

for(i=x0;i<WIDE;i )
if( getpixel(i,y0).dword==bcolor.dword )
{
xx[0]=i;
yy[0]=y0;
n ;
break;
}
if(n==0)
goto RETU;

f=0;
k=0;
while(1) {
j=f;
for(i=0;i<8;i )
{
if( i==0||i==2||i==4||i==6 )
j-=i;
else
j =i;
if(j<0) j =8;
if(j>=8) j-=8;
x=xx[k] fxy[j][0];
y=yy[k] fxy[j][1];
if( getpixel(x,y).dword==bcolor.dword)
{
putpixel(x,y);
xx[n]=x;
yy[n]=y;
n ; k ; f=j;
break;
}
}
if(i>=8)
{
n--;k--;
if(k<0)
goto RETU;
}
if(n>=maxxyn)
goto RETU;
if(xx[k]==xx[0]&&yy[k]==yy[0])
break;
}


for(i=1;i<n;i )
if(yy[i]!=yy[0])
{
ck=i;
break;
}
for(i=n-2;i>0;i--)
if(yy[i]!=yy[0])
{
pk=i;
break;
}
if((yy[pk]>yy[pk 1]&&yy[ck]>yy[ck-1])||(yy[pk]<yy[pk 1]&&yy[ck]<yy[ck-1]))
{
lfill.inspole(xx[pk 1],yy[pk 1]);
lfill.inspole(xx[ck-1],yy[ck-1]);
}
else
lfill.inspole(xx[ck-1],yy[ck-1]);

for(i=ck 1;i<n;i )
{
if(yy[i]!=yy[ck])
{
if((yy[i]>yy[ck]&&yy[ck-1]>yy[ck])||(yy[i]<yy[ck]&&yy[ck-1]<yy[ck]))
{
lfill.inspole(xx[ck],yy[ck]);
lfill.inspole(xx[i-1],yy[i-1]);
}
else
lfill.inspole(xx[ck],yy[ck]);
ck=i;
}
}

lfill.draw();

RETU:
free(xx);free(yy);
}