ref: c3ba64f6935322f09b6de5c2285544fd471c605d
dir: /sys/src/cmd/eqn/eqnbox.c/
#include "e.h"
void eqnbox(int p1, int p2, int lu)
{
double b, h;
char *sh;
yyval = p1;
b = max(ebase[p1], ebase[p2]);
eht[yyval] = h = b + max(eht[p1]-ebase[p1],
eht[p2]-ebase[p2]);
ebase[yyval] = b;
dprintf(".\tS%d <- %d %d; b=%g, h=%g\n", yyval, p1, p2, b, h);
sh = pad(class[rclass[p1]][lclass[p2]]);
if (lu) {
printf(".nr %d \\w'\\*(%d%s'\n", p1, p1, sh);
printf(".ds %d \\h'|\\n(09u-\\n(%du'\\*(%d\n", p1, p1, p1);
}
printf(".as %d \"%s\\*(%d\n", yyval, sh, p2);
rfont[p1] = rfont[p2];
rclass[p1] = rclass[p2];
sfree(p2);
}