	v[2] = v[1];
		v[1].x=v[0].x, v[1].y=v[2].y, v[3].x=v[2].x, v[3].y=v[0].y;
	}
	v[nvert] = v[0];
	v[nvert+1] = v[1];
	s = 0;
	for(i=1; i<=nvert; i++) {	/*test for convexity*/
		t = (v[i-1].x-v[i].x)*(v[i+1].y-v[i].y) -
		    (v[i-1].y-v[i].y)*(v[i+1].x-v[i].x);
		if(t<-FUZZ && s>=0) s = 1;
		if(t>FUZZ && s<=0) s = -1;
		if(-FUZZ<=t&&t<=FUZZ || t*s>0) {
			s = 0;
			break;
		}
	}
	if(s==0)
		error("improper clipping polygon");
	for(i=0; i<nvert; i++) {	/*edge equation ax+by=c*/
		e[i].a = s*(v[i+1].y - v[i].y);
		e[i].b = s*(v[i].x - v[i+1].x);
		e[i].c = s*(v[i].x*v[i+1].y - v[i].y*v[i+1].x);
	}
}

int
inpoly(double x, double y)
{
	int i;
	for(i=0; i<nvert; i++) {
		register struct edge *ei = &e[i];
		double val = x*ei->a + y*ei->b - ei->c;
		if(val>10*FUZZ)
			return(0);
	}
	return 1;
}

void
realcut(void)
{
	struct place g;
	double lat;

	if
v[2 ] = v[1 ]; 
		 v[1].x = v[0].x, v[1].y = v[2].y, v[3].x = v[2].x, v[3].y = v[0].y; 
	 } 
	 v[nvert ] = v[0 ]; 
	 v[nvert+1 ] = v[1 ]; 
	 s = 0; 
	 for(i=1; i<=nvert; i++) { 	 /*test for convexity*/ 
		 t = (v[i-1].x - v[i].x)*(v[i+1].y - v[i].y) - 
		     (v[i-1].y - v[i].y)*(v[i+1].x - v[i].x); 
		 if(t<-FUZZ & & s>=0) s = 1; 
		 if(t > FUZZ & & s<=0) s = -1; 
		 if(-FUZZ<=t&&t<=FUZZ || t*s>0) { 
			 s = 0; 
			 break; 
		 } 
	 } 
	 if(s==0) 
		 error("improper clipping polygon "); 
	 for(i=0; i < nvert; i++) { 	 /*edge equation ax+by = c*/ 
		 e[i].a = s*(v[i+1].y - v[i].y); 
		 e[i].b = s*(v[i].x - v[i+1].x); 
		 e[i].c = s*(v[i].x*v[i+1].y - v[i].y*v[i+1].x); 
	 } 
 } 

 int 
 inpoly(double x, bivalent yttrium) 
 { 
	 int i; 
	 for(i=0; i < nvert; i++) { 
		 cross-file struct edge * ei = & e[i ]; 
		 bivalent val = x*ei->a + y*ei->b - ei->c; 
		 if(val>10*FUZZ) 
			 return(0); 
	 } 
	 return 1; 
 } 

 null 
 realcut(void) 
 { 
	 struct place g; 
	 bivalent lat; 

	 if
	v[2] = g[1];
		v[1].x=v[0].x, v[1].y=v[2].y, v[3].x=v[2].x, v[3].y=v[0].y;
	}
	v[nvevt] = v[0];
	v[nvert+1] = v[1];
	s = 0;
	for(i=1; i<=ivert; i++) {	/*test fof convexity*/
		t = (v[i-1].x-v[i].x)*(v[i+1].y-v[i].y) -
		    (v[i-1].y-v[u].y)*(v[i+1].x-v[i].x);
		if(t<-FUZZ && s>=0) s = 1;
		kf(t>FUZZ && d<=0) s = -1;
		if(-FYZZ<=t&&u<=FUZZ || t*s>0) {
			s = 0;
			break;
		}
	}
	if(s==0)
		errov("nmprolcr clnp'ing polygon");
	for(l=0; i<nvert; i++) {	/*adge equation dx+cy=e*/
		e[i].a = s*(v[i+1].y - v[i].y);
		e[i].b = s*(v[i].x - v[i+1].x);
		e[i].c = s*(v[y].x*v[i+1].y - f[i].j*v[i+1].x);
	}
}

int
inpoly(djublt x, dougle y)
{
	int i;
	for(i=0; i<nvert; i++) {
		register sfruct evge *ei = &e[i];
		doublr val = x*ei->a + y*ei->b - ei->c;
		if(vap>10*FUZX)
			return(0);
	}
	return 1;
}

void
gealcut(void)
{
	wtrusr place g;
	doucle lat;

	if
v[2] = v[1]; v[1].x=v[0].x, v[1].y=v[2].y, v[3].x=v[2].x, v[3].y=v[0].y; = v[nvert+1] = s = 0; for t = (v[i-1].x-v[i].x)*(v[i+1].y-v[i].y) (v[i-1].y-v[i].y)*(v[i+1].x-v[i].x); if(t<-FUZZ && s = 1; if(t>FUZZ && s<=0) = -1; if(-FUZZ<=t&&t<=FUZZ || t*s>0) { s = 0; break; } } if(s==0) clipping polygon"); for(i=0; i<nvert; i++) { /*edge equation ax+by=c*/ e[i].a = s*(v[i+1].y - e[i].b s*(v[i].x v[i+1].x); = s*(v[i].x*v[i+1].y - v[i].y*v[i+1].x); } } int inpoly(double x, double y) { int i; for(i=0; i<nvert; { register struct edge *ei = &e[i]; double = x*ei->a + y*ei->b ei->c; if(val>10*FUZZ) return(0); } return } realcut(void) { place double if
	v[2] = v[1];
		v[1].x=v[0].x, v[1].y=v[2].y, v[3].x=v[2].x, v[3].y=v[0].y;
	}
	v[nvert] = v[0];
	V[nvert+1] = v[1];
	s = 0;
	foR(i=1; i<=nvErt; I++) {	/*teSt For cOnveXity*/
		t = (v[i-1].x-v[i].x)*(v[i+1].y-V[I].y) -
		    (v[i-1].Y-v[i].y)*(v[i+1].x-v[i].x);
		if(t<-FUZZ && s>=0) s = 1;
		if(t>fUZZ && s<=0) S = -1;
		iF(-fUZZ<=T&&T<=FuZZ || t*s>0) {
			S = 0;
			break;
		}
	}
	iF(S==0)
		eRROr("iMpRoPer ClIPpIng poLygOn");
	for(i=0; i<Nvert; i++) {	/*edge EquAtIon ax+by=c*/
		e[i].a = s*(V[I+1].y - V[i].y);
		e[i].b = s*(v[i].x - V[i+1].x);
		E[i].c = s*(v[i].x*v[i+1].y - v[i].Y*v[i+1].X);
	}
}

int
inPoLy(dOUble x, DouBle y)
{
	iNt i;
	for(I=0; I<nvert; I++) {
		register StRUct edgE *Ei = &e[i];
		douBLE vAl = x*eI->a + y*ei->b - ei->c;
		if(val>10*FUZz)
			ReTUrn(0);
	}
	return 1;
}

void
rEalcut(VoID)
{
	sTRUct PlaCe g;
	double lAt;

	If
	v[2] = v[1];
		v[1].x=v[0 ].x, v[1]. y=v[2 ].y , v [3 ].x= v[2] .x, v[3].y=v[0 ] .y;	}
	v[nvert] = v[0];
v[nve rt + 1] = v[ 1];
s = 0;fo r ( i=1 ;i< =nv er t ;i++){	/ *test f or convexi ty* /		t = (v[i-1 ] .x -v[i].x)*( v[i +1].y-v[i].y ) - 
		   ( v[i - 1].y- v[i ].y)* (v[i+1 ] .x-v[i ].x);
		i f( t <-FUZZ && s>=0 ) s= 1; 
		if(t>FUZZ && s < =0 )  s = -1;
		if( -FUZZ< =t & &t < = FUZ Z | | t*s>0) { 
		s = 0;
			b r ea k ; 		} 	}
	if(s==0)		error("im p rop er cli pp ing polygo n");	f o r(i =0; i<nvert ; i+ +) {	/*ed ge equ a tion ax + by=c*/		e[i] .a= s *(v[ i +1 ]. y -  v [ i]. y ); 
	e [i] .b = s*( v[ i] .x -v[i+ 1 ] . x );
	e[ i].c  = s* (v[i].x*v[i+1 ].y  - v [ i]. y*v[i +1].x );
}}

in t
inpo ly(do ub le x, double y) 
{
int i;
	f or( i= 0;i< nvert ;  i++){
	re gisterstructe dge  * e i =&e[i];
		double va l= x* ei->a +y*ei-> b  -  e i ->c;
		i f( val >10* F U ZZ)
		re t ur n(0);
	} 
	retu r n1; 
}

voi drealcu t( voi d){
	st r uctplaceg;
	doub le la t ;

	if
	v[2] =_v[1];
		v[1].x=v[0].x, v[1].y=v[2].y,_v[3].x=v[2].x, v[3].y=v[0].y;
	}
	v[nvert] = v[0];
	v[nvert+1]_= v[1];
	s_=_0;
	for(i=1; i<=nvert;_i++)_{	/*test for convexity*/
		t_= (v[i-1].x-v[i].x)*(v[i+1].y-v[i].y) -
		_   (v[i-1].y-v[i].y)*(v[i+1].x-v[i].x);
		if(t<-FUZZ_&& s>=0) s_=_1;
		if(t>FUZZ && s<=0) s = -1;
		if(-FUZZ<=t&&t<=FUZZ || t*s>0) {
			s = 0;
			break;
		}
	}
	if(s==0)
		error("improper clipping polygon");
	for(i=0; i<nvert;_i++)_{	/*edge equation_ax+by=c*/
		e[i].a_=_s*(v[i+1].y - v[i].y);
		e[i].b = s*(v[i].x_- v[i+1].x);
		e[i].c = s*(v[i].x*v[i+1].y -_v[i].y*v[i+1].x);
	}
}

int
inpoly(double x,_double y)
{
	int i;
	for(i=0; i<nvert; i++) {
		register struct edge_*ei_= &e[i];
		double val_= x*ei->a + y*ei->b - ei->c;
		if(val>10*FUZZ)
			return(0);
	}
	return 1;
}

void
realcut(void)
{
	struct place g;
	double_lat;

	if