1 # include "e.h"
2 
3 void fromto(int p1, int p2, int p3)
4 {
5 	double b, h1, b1, t;
6 	int subps;
7 
8 	yyval = salloc();
9 	lfont[yyval] = rfont[yyval] = 0;
10 	h1 = eht[yyval] = eht[p1];
11 	b1 = ebase[p1];
12 	b = 0;
13 	subps = ps;
14 	ps += deltaps;
15 	nrwid(p1, ps, p1);
16 	printf(".nr %d \\n(%d\n", (int)yyval, p1);
17 	if (p2 > 0) {
18 		nrwid(p2, subps, p2);
19 		printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, (int)yyval, (int)yyval, p2);
20 		eht[yyval] += eht[p2];
21 		b = eht[p2];
22 	}
23 	if (p3 > 0) {
24 		nrwid(p3, subps, p3);
25 		printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p3, (int)yyval, (int)yyval, p3);
26 		eht[yyval] += eht[p3];
27 	}
28 	printf(".ds %d ", (int)yyval);	/* bottom of middle box */
29 	if (p2 > 0) {
30 		t = eht[p2]-ebase[p2]+b1;
31 		printf("\\v'%gm'\\h'\\n(%du-\\n(%du/2u'%s\\*(%d%s",
32 			REL(t,ps), (int)yyval, p2, DPS(ps,subps), p2, DPS(subps,ps));
33 		printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%gm'\\\n",
34 			(int)yyval, p2, REL(-t,ps));
35 	}
36 	printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du/2u'\\\n",
37 		(int)yyval, p1, p1, (int)yyval, p1);
38 	if (p3  >0) {
39 		t = h1-b1+ebase[p3];
40 		printf("\\v'%gm'\\h'-\\n(%du-\\n(%du/2u'%s\\*(%d%s\\h'\\n(%du-\\n(%du/2u'\\v'%gm'\\\n",
41 			REL(-t,ps), (int)yyval, p3, DPS(ps,subps), p3, DPS(subps,ps), (int)yyval, p3, REL(t,ps));
42 	}
43 	printf("\n");
44 	ebase[yyval] = b + b1;
45 	dprintf(".\tS%d <- %d from %d to %d; h=%g b=%g\n",
46 		(int)yyval, p1, p2, p3, eht[yyval], ebase[yyval]);
47 	sfree(p1);
48 	if (p2 > 0)
49 		sfree(p2);
50 	if (p3 > 0)
51 		sfree(p3);
52 }