projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| d6776df5 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 | spew (ESC); | |
| 30 | spew(PLOTIN); | |
| 31 | } | |
| 32 | ||
| 33 | outplot() | |
| 34 | { | |
| 35 | spew(ESC); | |
| 36 | spew(PLOTOUT); | |
| 37 | fflush(stdout); | |
| 38 | } | |
| 39 | ||
| 40 | spew(ch) | |
| 41 | { | |
| 42 | if(ch == UP){ | |
| 43 | putc(ESC,stdout); | |
| 44 | ch = DOWN; | |
| 45 | } | |
| 46 | putc(ch, stdout); | |
| 47 | } | |
| 48 | ||
| 49 | tobotleft () | |
| 50 | { | |
| 51 | move(-2048,-2048); | |
| 52 | } | |
| 53 | reset() | |
| 54 | { | |
| 55 | signal(2,1); | |
| 56 | outplot(); | |
| 57 | stty(OUTF,&ITTY); | |
| 58 | exit(); | |
| 59 | } | |
| 60 | ||
| 61 | float | |
| 62 | dist2 (x1, y1, x2, y2) | |
| 63 | { | |
| 64 | float t,v; | |
| 65 | t = x2-x1; | |
| 66 | v = y1-y2; | |
| 67 | return (t*t+v*v); | |
| 68 | } | |
| 69 | ||
| 70 | swap (pa, pb) | |
| 71 | int *pa, *pb; | |
| 72 | { | |
| 73 | int t; | |
| 74 | t = *pa; | |
| 75 | *pa = *pb; | |
| 76 | *pb = t; | |
| 77 | } | |
| 78 | movep (xg,yg) | |
| 79 | { | |
| 80 | int i,ch; | |
| 81 | if((xg == xnow) && (yg == ynow))return; | |
| 82 | /* if we need to go to left margin, just CR */ | |
| 83 | if (xg < xnow/2) | |
| 84 | { | |
| 85 | spew(CR); | |
| 86 | xnow = 0; | |
| 87 | } | |
| 88 | i = (xg-xnow)/HORZRES; | |
| 89 | if(xnow < xg)ch = RIGHT; | |
| 90 | else ch = LEFT; | |
| 91 | xnow += i*HORZRES; | |
| 92 | i = abval(i); | |
| 93 | while(i--)spew(ch); | |
| 94 | i = abval(xg-xnow); | |
| 95 | inplot(); | |
| 96 | while(i--) spew(ch); | |
| 97 | outplot(); | |
| 98 | i=(yg-ynow)/VERTRES; | |
| 99 | if(ynow < yg)ch = UP; | |
| 100 | else ch = DOWN; | |
| 101 | ynow += i*VERTRES; | |
| 102 | i = abval(i); | |
| 103 | while(i--)spew(ch); | |
| 104 | i=abval(yg-ynow); | |
| 105 | inplot(); | |
| 106 | while(i--)spew(ch); | |
| 107 | outplot(); | |
| 108 | xnow = xg; ynow = yg; | |
| 109 | } | |
| 110 | ||
| 111 | xsc(xi){ | |
| 112 | int xa; | |
| 113 | xa = (xi - obotx) * scalex + botx; | |
| 114 | return(xa); | |
| 115 | } | |
| 116 | ysc(yi){ | |
| 117 | int ya; | |
| 118 | ya = (yi - oboty) *scaley +boty; | |
| 119 | return(ya); | |
| 120 | } |