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1.1 root 1: #ifndef lint
2: static char sccsid[] = "@(#)shift.c 4.3 8/11/83";
3: #endif
4:
5: # include "e.h"
6: #include "e.def"
7:
8: bshiftb(p1, dir, p2) int p1, dir, p2; {
9: int shval, d1, h1, b1, h2, b2;
10: #ifndef NEQN
11: int diffps, effps, effps2;
12: char *sh1, *sh2;
13: #endif NEQN
14:
15: yyval = p1;
16: h1 = eht[p1];
17: b1 = ebase[p1];
18: h2 = eht[p2];
19: b2 = ebase[p2];
20: #ifndef NEQN
21: effps = EFFPS(ps);
22: effps2 = EFFPS(ps+deltaps);
23: diffps = deltaps;
24: sh1 = sh2 = "";
25: #endif NEQN
26: if( dir == SUB ) { /* subscript */
27: #ifndef NEQN
28: /* top 1/2m above bottom of main box */
29: d1 = VERT( (effps2*6)/2 );
30: #else NEQN
31: d1 = VERT(1);
32: #endif NEQN
33: shval = - d1 + h2 - b2;
34: if( d1+b1 > h2 ) /* move little sub down */
35: shval = b1-b2;
36: ebase[yyval] = b1 + max(0, h2-b1-d1);
37: eht[yyval] = h1 + max(0, h2-b1-d1);
38: #ifndef NEQN
39: if (rfont[p1] == ITAL && lfont[p2] == ROM)
40: sh1 = "\\|";
41: if (rfont[p2] == ITAL)
42: sh2 = "\\|";
43: #endif NEQN
44: } else { /* superscript */
45: #ifndef NEQN
46: /* 4/10 up main box */
47: d1 = VERT( (effps*6*2)/10 );
48: #else NEQN
49: d1 = VERT(1);
50: #endif NEQN
51: ebase[yyval] = b1;
52: #ifndef NEQN
53: shval = -VERT( (4 * (h1-b1)) / 10 ) - b2;
54: if( VERT(4*(h1-b1)/10) + h2 < h1-b1 ) /* raise little super */
55: #else NEQN
56: shval = -VERT(1) - b2;
57: if( VERT(1) + h2 < h1-b1 ) /* raise little super */
58: #endif NEQN
59: shval = -(h1-b1) + h2-b2 - d1;
60: #ifndef NEQN
61: eht[yyval] = h1 + max(0, h2-VERT((6*(h1-b1))/10));
62: if (rfont[p1] == ITAL)
63: sh1 = "\\|";
64: if (rfont[p2] == ITAL)
65: sh2 = "\\|";
66: #else NEQN
67: eht[yyval] = h1 + max(0, h2 - VERT(1));
68: #endif NEQN
69: }
70: if(dbg)printf(".\tb:b shift b: S%d <- S%d vert %d S%d vert %d; b=%d, h=%d\n",
71: yyval, p1, shval, p2, -shval, ebase[yyval], eht[yyval]);
72: #ifndef NEQN
73: printf(".as %d \\v'%du'\\s-%d%s\\*(%d\\s+%d%s\\v'%du'\n",
74: yyval, shval, diffps, sh1, p2, diffps, sh2, -shval);
75: ps += deltaps;
76: if (rfont[p2] == ITAL)
77: rfont[p1] = 0;
78: else
79: rfont[p1] = rfont[p2];
80: #else NEQN
81: printf(".as %d \\v'%du'\\*(%d\\v'%du'\n",
82: yyval, shval, p2, -shval);
83: #endif NEQN
84: ofree(p2);
85: }
86:
87: shift(p1) int p1; {
88: ps -= deltaps;
89: yyval = p1;
90: if(dbg)printf(".\tshift: %d;ps=%d\n", yyval, ps);
91: }
92:
93: shift2(p1, p2, p3) int p1, p2, p3; {
94: int effps, h1, h2, h3, b1, b2, b3, subsh, d1, d2, supsh, treg;
95: #ifndef NEQN
96: int effps2;
97: #endif NEQN
98:
99: treg = oalloc();
100: yyval = p1;
101: if(dbg)printf(".\tshift2 s%d <- %d %d %d\n", yyval, p1, p2, p3);
102: effps = EFFPS(ps+deltaps);
103: #ifndef NEQN
104: eht[p3] = h3 = VERT( (eht[p3] * effps) / EFFPS(ps) );
105: ps += deltaps;
106: effps2 = EFFPS(ps+deltaps);
107: #endif NEQN
108: h1 = eht[p1]; b1 = ebase[p1];
109: h2 = eht[p2]; b2 = ebase[p2];
110: #ifndef NEQN
111: b3 = ebase[p3];
112: d1 = VERT( (effps2*6)/2 );
113: #else NEQN
114: h3 = eht[p3]; b3 = ebase[p3];
115: d1 = VERT(1);
116: #endif NEQN
117: subsh = -d1+h2-b2;
118: if( d1+b1 > h2 ) /* move little sub down */
119: subsh = b1-b2;
120: #ifndef NEQN
121: supsh = -VERT( (4*(h1-b1))/10 ) - b3;
122: d2 = VERT( (effps*6*2)/10 );
123: if( VERT(4*(h1-b1)/10)+h3 < h1-b1 )
124: #else NEQN
125: supsh = - VERT(1) - b3;
126: d2 = VERT(1);
127: if( VERT(1)+h3 < h1-b1 )
128: #endif NEQN
129: supsh = -(h1-b1) + (h3-b3) - d2;
130: #ifndef NEQN
131: eht[yyval] = h1 + max(0, h3-VERT( (6*(h1-b1))/10 )) + max(0, h2-b1-d1);
132: #else NEQN
133: eht[yyval] = h1 + max(0, h3-VERT(1)) + max(0, h2-b1-d1);
134: #endif NEQN
135: ebase[yyval] = b1+max(0, h2-b1-d1);
136: #ifndef NEQN
137: if (rfont[p1] == ITAL && lfont[p2] == ROM)
138: printf(".ds %d \\|\\*(%d\n", p2, p2);
139: if (rfont[p2] == ITAL)
140: printf(".as %d \\|\n", p2);
141: #endif NEQN
142: nrwid(p2, effps, p2);
143: #ifndef NEQN
144: if (rfont[p1] == ITAL && lfont[p3] == ROM)
145: printf(".ds %d \\|\\|\\*(%d\n", p3, p3);
146: else
147: printf(".ds %d \\|\\*(%d\n", p3, p3);
148: #endif NEQN
149: nrwid(p3, effps, p3);
150: printf(".nr %d \\n(%d\n", treg, p3);
151: printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, treg, treg, p2);
152: #ifndef NEQN
153: printf(".as %d \\v'%du'\\s%d\\*(%d\\h'-\\n(%du'\\v'%du'\\\n",
154: p1, subsh, effps, p2, p2, -subsh+supsh);
155: printf("\\s%d\\*(%d\\h'-\\n(%du+\\n(%du'\\s%d\\v'%du'\n",
156: effps, p3, p3, treg, effps2, -supsh);
157: #else NEQN
158: printf(".as %d \\v'%du'\\*(%d\\h'-\\n(%du'\\v'%du'\\\n",
159: p1, subsh, p2, p2, -subsh+supsh);
160: printf("\\*(%d\\h'-\\n(%du+\\n(%du'\\v'%du'\n",
161: p3, p3, treg, -supsh);
162: #endif NEQN
163: ps += deltaps;
164: #ifndef NEQN
165: if (rfont[p2] == ITAL)
166: rfont[yyval] = 0; /* lie */
167: #endif NEQN
168: ofree(p2); ofree(p3); ofree(treg);
169: }
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