ref: 71a993b4ca2c455f491aad669e3a4ac2979f6bb8
dir: /sys/src/cmd/eqn/pile.c/
#include "e.h"
#include "y.tab.h"
void pile(int oct)
{
int i, nlist, nlist2, mid;
double bi, h, b, gap, sb;
extern double Pilegap, Pilebase;
int type, p1, p2;
yyval = salloc();
type = lp[oct];
p1 = oct + 3; /* first entry */
p2 = p1 + lp[oct+1]; /* 1 after last */
gap = lp[oct+2];
if (gap != DEFGAP)
gap = EM(gap/100.0, ps);
else if (type == COL)
gap = 0;
else
gap = EM(Pilegap, ps); /* 0.4 m between LCOL, etc. */
nlist = p2 - p1;
nlist2 = (nlist+1)/2;
mid = p1 + nlist2 - 1;
h = 0;
for (i = p1; i < p2; i++)
h += eht[lp[i]];
eht[yyval] = h + (nlist-1)*gap;
b = 0;
for (i = p2-1; i > mid; i--)
b += eht[lp[i]] + gap;
ebase[yyval] = (nlist%2) ? b + ebase[lp[mid]]
: b - EM(Pilebase, ps) - gap;
if (dbg) {
printf(".\tS%d <- %d pile of:", yyval, type);
for (i = p1; i < p2; i++)
printf(" S%d", lp[i]);
printf("; h=%g b=%g\n", eht[yyval], ebase[yyval]);
}
nrwid(lp[p1], ps, lp[p1]);
printf(".nr %d \\n(%d\n", yyval, lp[p1]);
for (i = p1+1; i < p2; i++) {
nrwid(lp[i], ps, lp[i]);
printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n",
lp[i], yyval, yyval, lp[i]);
}
printf(".ds %d \\v'%gm'\\h'%du*\\n(%du'\\\n", yyval, REL(ebase[yyval],ps),
type==RCOL ? 1 : 0, yyval);
sb = 0; /* sum of box hts */
for (i = p2-1; i >= p1; i--) {
bi = sb + ebase[lp[i]];
switch (type) {
case LCOL:
printf("\\v'%gm'\\*(%d\\h'-\\n(%du'\\v'%gm'\\\n",
REL(-bi,ps), lp[i], lp[i], REL(bi,ps));
break;
case RCOL:
printf("\\v'%gm'\\h'-\\n(%du'\\*(%d\\v'%gm'\\\n",
REL(-bi,ps), lp[i], lp[i], REL(bi,ps));
break;
case CCOL:
case COL:
printf("\\v'%gm'\\h'\\n(%du-\\n(%du/2u'\\*(%d",
REL(-bi,ps), yyval, lp[i], lp[i]);
printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%gm'\\\n",
yyval, lp[i], REL(bi,ps));
break;
}
sb += eht[lp[i]] + gap;
}
printf("\\v'%gm'\\h'%du*\\n(%du'\n", REL(-ebase[yyval],ps),
type!=RCOL ? 1 : 0, yyval);
for (i = p1; i < p2; i++)
sfree(lp[i]);
lfont[yyval] = rfont[yyval] = 0;
}