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[unix-history] / usr / src / cmd / eqn / shift.c

# include "e.h"
#include "e.def"

bshiftb(p1, dir, p2) int p1, dir, p2; {
       int shval, diffps, effps, effps2, d1, h1, b1, h2, b2;
       char *sh1, *sh2;

       yyval = p1;
       h1 = eht[p1];
       b1 = ebase[p1];
       h2 = eht[p2];
       b2 = ebase[p2];
       effps = EFFPS(ps);
       effps2 = EFFPS(ps+deltaps);
       diffps = deltaps;
       sh1 = sh2 = "";
       if( dir == SUB ) {
               /* top 1/2m above bottom of main box */
               d1 = VERT( (effps2*6)/2 );
               shval = - d1 + h2 - b2;
               if( d1+b1 > h2 ) /* move little sub down */
                       shval = b1-b2;
               ebase[yyval] = b1 + max(0, h2-b1-d1);
               eht[yyval] = h1 + max(0, h2-b1-d1);
               if (rfont[p1] == ITAL && lfont[p2] == ROM)
                       sh1 = "\\|";
               if (rfont[p2] == ITAL)
                       sh2 = "\\|";
       } else {        /* superscript */
               /* 4/10 up main box */
               d1 = VERT( (effps*6*2)/10 );
               ebase[yyval] = b1;
               shval = -VERT( (4 * (h1-b1)) / 10 ) - b2;
               if( VERT(4*(h1-b1)/10) + h2 < h1-b1 )   /* raise little super */
                       shval = -(h1-b1) + h2-b2 - d1;
               eht[yyval] = h1 + max(0, h2-VERT((6*(h1-b1))/10));
               if (rfont[p1] == ITAL)
                       sh1 = "\\|";
               if (rfont[p2] == ITAL)
                       sh2 = "\\|";
       }
       if(dbg)printf(".\tb:b shift b: S%d <- S%d vert %d S%d vert %d; b=%d, h=%d\n", 
               yyval, p1, shval, p2, -shval, ebase[yyval], eht[yyval]);
       printf(".as %d \\v'%du'\\s-%d%s\\*(%d\\s+%d%s\\v'%du'\n", 
               yyval, shval, diffps, sh1, p2, diffps, sh2, -shval);
       ps += deltaps;
       if (rfont[p2] == ITAL)
               rfont[p1] = 0;
       else
               rfont[p1] = rfont[p2];
       ofree(p2);
}

shift(p1) int p1; {
       ps -= deltaps;
       yyval = p1;
       if(dbg)printf(".\tshift: %d;ps=%d\n", yyval, ps);
}

shift2(p1, p2, p3) int p1, p2, p3; {
       int effps, effps2, h1, h2, h3, b1, b2, b3, subsh, d1, d2, supsh;
       int treg;
       treg = oalloc();
       yyval = p1;
       if(dbg)printf(".\tshift2 s%d <- %d %d %d\n", yyval, p1, p2, p3);
       effps = EFFPS(ps+deltaps);
       eht[p3] = h3 = VERT( (eht[p3] * effps) / EFFPS(ps) );
       ps += deltaps;
       effps2 = EFFPS(ps+deltaps);
       h1 = eht[p1]; b1 = ebase[p1];
       h2 = eht[p2]; b2 = ebase[p2];
       b3 = ebase[p3];
       d1 = VERT( (effps2*6)/2 );
       subsh = -d1+h2-b2;
       if( d1+b1 > h2 ) /* move little sub down */
               subsh = b1-b2;
       supsh = -VERT( (4*(h1-b1))/10 ) - b3;
       d2 = VERT( (effps*6*2)/10 );
       if( VERT(4*(h1-b1)/10)+h3 < h1-b1 )
               supsh = -(h1-b1) + (h3-b3) - d2;
       eht[yyval] = h1 + max(0, h3-VERT( (6*(h1-b1))/10 )) + max(0, h2-b1-d1);
       ebase[yyval] = b1+max(0, h2-b1-d1);
       if (rfont[p1] == ITAL && lfont[p2] == ROM)
               printf(".ds %d \\|\\*(%d\n", p2, p2);
       if (rfont[p2] == ITAL)
               printf(".as %d \\|\n", p2);
       nrwid(p2, effps, p2);
       if (rfont[p1] == ITAL && lfont[p3] == ROM)
               printf(".ds %d \\|\\|\\*(%d\n", p3, p3);
       else
               printf(".ds %d \\|\\*(%d\n", p3, p3);
       nrwid(p3, effps, p3);
       printf(".nr %d \\n(%d\n", treg, p3);
       printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, treg, treg, p2);
       printf(".as %d \\v'%du'\\s%d\\*(%d\\h'-\\n(%du'\\v'%du'\\\n", 
               p1, subsh, effps, p2, p2, -subsh+supsh);
       printf("\\s%d\\*(%d\\h'-\\n(%du+\\n(%du'\\s%d\\v'%du'\n", 
               effps, p3, p3, treg, effps2, -supsh);
       ps += deltaps;
       if (rfont[p2] == ITAL)
               rfont[yyval] = 0;       /* lie */
       ofree(p2); ofree(p3); ofree(treg);
}