#include "map.h" static float v3,u2,u3,a,b; /*v=view,p=obj,u=unit.y*/ static intXharrison(struct place *place, float *x, float *y){	float p1 = -place->nlat.c*place->wlon.s;	float p2 = -place->nlat.c*place->wlon.c;	float p3 = place->nlat.s;	float d = b + u3*p2 - u2*p3;	float t;	if(d < .01)		return 0;	t = a/d;	if(t < 0)		return 0;	if(v3*place->nlat.s < 1.)		return -1;	*y = t*p2*u2 + (v3-t*(v3-p3))*u3;	*x = t*p1;	if(*x * *x + *y * *y > 16)		return 0;	return 1;} projharrison(float r, float alpha){	u2 = cos(alpha*RAD);	u3 = sin(alpha*RAD);	v3 = r;	b = r*u2;	a = 1 + b;	if(r<1.001 || a<sqrt(r*r-1))		return 0;	return Xharrison;}