ref: 4d69aacea023546a7150d92e147e531c38de822f
dir: /sys/src/cmd/eqn/sqrt.c/
#include "e.h"
void sqrt(int p2)
{
static int af = 0;
int nps; /* point size for radical */
double radscale = 0.95;
if (ttype == DEVPOST)
radscale = 1.05;
nps = ps * radscale * eht[p2] / EM(1.0,ps) + 0.99; /* kludgy */
nps = max(EFFPS(nps), ps);
yyval = p2;
if (ttype == DEVCAT || ttype == DEVAPS)
eht[yyval] = EM(1.2, nps);
else if (ttype == DEVPOST)
eht[yyval] = EM(1.15, nps);
else /* DEV202, DEVPOST */
eht[yyval] = EM(1.15, nps);
dprintf(".\tS%d <- sqrt S%d;b=%g, h=%g, nps=%d\n",
yyval, p2, ebase[yyval], eht[yyval], nps);
printf(".as %d \\|\n", yyval);
nrwid(p2, ps, p2);
if (af++ == 0)
printf(".af 10 01\n"); /* make it two digits when it prints */
printf(".nr 10 %.3fu*\\n(.su/10\n", 9.2*eht[p2]); /* this nonsense */
/* guesses point size corresponding to height of stuff */
printf(".ds %d \\v'%gm'\\s(\\n(10", yyval, REL(ebase[p2],ps));
if (ttype == DEVCAT || ttype == DEVAPS)
printf("\\v'-.2m'\\(sr\\l'\\n(%du\\(rn'\\v'.2m'", p2);
else /* DEV202, DEVPOST so far */
printf("\\(sr\\l'\\n(%du\\(rn'", p2);
printf("\\s0\\v'%gm'\\h'-\\n(%du'\\^\\*(%d\n", REL(-ebase[p2],ps), p2, p2);
lfont[yyval] = rfont[yyval] = ROM;
}