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WebSVN – planix.SVN – Blame – /os/branches/feature_tlsv12/sys/src/cmd/eqn/fromto.c – Rev 2

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2 - 1 
# include "e.h"
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void fromto(int p1, int p2, int p3)
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{
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	double b, h1, b1, t;
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	int subps;
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	yyval = salloc();
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	lfont[yyval] = rfont[yyval] = 0;
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	h1 = eht[yyval] = eht[p1];
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	b1 = ebase[p1];
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	b = 0;
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	subps = ps;
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	ps += deltaps;
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	nrwid(p1, ps, p1);
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	printf(".nr %d \\n(%d\n", yyval, p1);
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	if (p2 > 0) {
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		nrwid(p2, subps, p2);
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		printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, yyval, yyval, p2);
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		eht[yyval] += eht[p2];
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		b = eht[p2];
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	}
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	if (p3 > 0) {
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		nrwid(p3, subps, p3);
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		printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p3, yyval, yyval, p3);
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		eht[yyval] += eht[p3];
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	}
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	printf(".ds %d ", yyval);	/* bottom of middle box */
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	if (p2 > 0) {
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		t = eht[p2]-ebase[p2]+b1;
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		printf("\\v'%gm'\\h'\\n(%du-\\n(%du/2u'%s\\*(%d%s",
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			REL(t,ps), yyval, p2, DPS(ps,subps), p2, DPS(subps,ps));
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		printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%gm'\\\n",
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			yyval, p2, REL(-t,ps));
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	}
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	printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du/2u'\\\n",
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		yyval, p1, p1, yyval, p1);
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	if (p3  >0) {
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		t = h1-b1+ebase[p3];
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		printf("\\v'%gm'\\h'-\\n(%du-\\n(%du/2u'%s\\*(%d%s\\h'\\n(%du-\\n(%du/2u'\\v'%gm'\\\n",
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			REL(-t,ps), yyval, p3, DPS(ps,subps), p3, DPS(subps,ps), yyval, p3, REL(t,ps));
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	}
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	printf("\n");
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	ebase[yyval] = b + b1;
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	dprintf(".\tS%d <- %d from %d to %d; h=%g b=%g\n",
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		yyval, p1, p2, p3, eht[yyval], ebase[yyval]);
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	sfree(p1);
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	if (p2 > 0)
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		sfree(p2);
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	if (p3 > 0)
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		sfree(p3);
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}