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 | } |