projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 85ae2565 SL |
1 | #ifndef lint |
| 2 | static char sccsid[] = "@(#)subr.c 4.1 (Berkeley) %G%"; | |
| 3 | #endif | |
| 4 | ||
| 5 | #include <stdio.h> | |
| 6 | #include "con.h" | |
| 7 | abval(q) | |
| 8 | { | |
| 9 | return (q>=0 ? q : -q); | |
| 10 | } | |
| 11 | ||
| 12 | xconv (xp) | |
| 13 | { | |
| 14 | /* x position input is -2047 to +2047, output must be 0 to PAGSIZ*HORZRES */ | |
| 15 | xp += 2048; | |
| 16 | /* the computation is newx = xp*(PAGSIZ*HORZRES)/4096 */ | |
| 17 | return (xoffset + xp /xscale); | |
| 18 | } | |
| 19 | ||
| 20 | yconv (yp) | |
| 21 | { | |
| 22 | /* see description of xconv */ | |
| 23 | yp += 2048; | |
| 24 | return (yp / yscale); | |
| 25 | } | |
| 26 | ||
| 27 | inplot() | |
| 28 | { | |
| 29 | stty(OUTF, &PTTY); | |
| 30 | spew(ESC); | |
| 31 | spew (INPLOT); | |
| 32 | } | |
| 33 | ||
| 34 | outplot() | |
| 35 | { | |
| 36 | spew(ESC); | |
| 37 | spew(ACK); | |
| 38 | spew(ESC); | |
| 39 | spew(ACK); | |
| 40 | fflush(stdout); | |
| 41 | stty (OUTF, &ITTY); | |
| 42 | } | |
| 43 | ||
| 44 | spew(ch) | |
| 45 | { | |
| 46 | putc(ch, stdout); | |
| 47 | } | |
| 48 | ||
| 49 | tobotleft () | |
| 50 | { | |
| 51 | move(-2048,-2048); | |
| 52 | } | |
| 53 | reset() | |
| 54 | { | |
| 55 | outplot(); | |
| 56 | exit(); | |
| 57 | } | |
| 58 | ||
| 59 | float | |
| 60 | dist2 (x1, y1, x2, y2) | |
| 61 | { | |
| 62 | float t,v; | |
| 63 | t = x2-x1; | |
| 64 | v = y1-y2; | |
| 65 | return (t*t+v*v); | |
| 66 | } | |
| 67 | ||
| 68 | swap (pa, pb) | |
| 69 | int *pa, *pb; | |
| 70 | { | |
| 71 | int t; | |
| 72 | t = *pa; | |
| 73 | *pa = *pb; | |
| 74 | *pb = t; | |
| 75 | } | |
| 76 | ||
| 77 | #define DOUBLE 010 | |
| 78 | #define ADDR 0100 | |
| 79 | #define COM 060 | |
| 80 | #define MAXX 070 | |
| 81 | #define MAXY 07 | |
| 82 | extern xnow,ynow; | |
| 83 | #define SPACES 7 | |
| 84 | movep(ix,iy){ | |
| 85 | int dx,dy,remx,remy,pts,i; | |
| 86 | int xd,yd; | |
| 87 | int addr,command; | |
| 88 | char c; | |
| 89 | if(xnow == ix && ynow == iy)return; | |
| 90 | inplot(); | |
| 91 | dx = ix-xnow; | |
| 92 | dy = iy-ynow; | |
| 93 | command = COM|PENUP|((dx<0)<<1)|(dy<0); | |
| 94 | dx = abval(dx); | |
| 95 | dy = abval(dy); | |
| 96 | xd = dx/(SPACES*2); | |
| 97 | yd = dy/(SPACES*2); | |
| 98 | pts = xd<yd?xd:yd; | |
| 99 | if((i=pts)>0){ | |
| 100 | c=command|DOUBLE; | |
| 101 | addr=ADDR; | |
| 102 | if(xd>0)addr|=MAXX; | |
| 103 | if(yd>0)addr|=MAXY; | |
| 104 | spew(c); | |
| 105 | while(i--){ | |
| 106 | spew(addr); | |
| 107 | } | |
| 108 | } | |
| 109 | if(xd!=yd){ | |
| 110 | if(xd>pts){ | |
| 111 | i=xd-pts; | |
| 112 | addr=ADDR|MAXX; | |
| 113 | } | |
| 114 | else{ | |
| 115 | i=yd-pts; | |
| 116 | addr=ADDR|MAXY; | |
| 117 | } | |
| 118 | c=command|DOUBLE; | |
| 119 | spew(c); | |
| 120 | while(i--){ | |
| 121 | spew(addr); | |
| 122 | } | |
| 123 | } | |
| 124 | remx=dx-xd*SPACES*2; | |
| 125 | remy=dy-yd*SPACES*2; | |
| 126 | addr=ADDR; | |
| 127 | i = 0; | |
| 128 | if(remx>7){ | |
| 129 | i=1; | |
| 130 | addr|=MAXX; | |
| 131 | remx -= 7; | |
| 132 | } | |
| 133 | if(remy>7){ | |
| 134 | i=1; | |
| 135 | addr|=MAXY; | |
| 136 | remy -= 7; | |
| 137 | } | |
| 138 | while(i--){ | |
| 139 | spew(command); | |
| 140 | spew(addr); | |
| 141 | } | |
| 142 | if(remx>0||remy>0){ | |
| 143 | spew(command); | |
| 144 | spew(ADDR|remx<<3|remy); | |
| 145 | } | |
| 146 | xnow=ix; | |
| 147 | ynow=iy; | |
| 148 | outplot(); | |
| 149 | return; | |
| 150 | } | |
| 151 | xsc(xi){ | |
| 152 | int xa; | |
| 153 | xa = (xi - obotx) * scalex + botx; | |
| 154 | return(xa); | |
| 155 | } | |
| 156 | ysc(yi){ | |
| 157 | int ya; | |
| 158 | ya = (yi - oboty) *scaley +boty; | |
| 159 | return(ya); | |
| 160 | } |