2.9BSD - /usr/src/lib/plot/t300/subr.c

   1: #ifndef lint
   2: static char sccsid[] = "@(#)subr.c	4.1 (Berkeley) 6/27/83";
   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 (ACK);
  31: }
  32: 
  33: outplot()
  34: {
  35:     spew(ESC);
  36:     spew(ACK);
  37:     fflush(stdout);
  38:     stty(OUTF, &ITTY);
  39: }
  40: 
  41: spew(ch)
  42: {
  43:     if(ch == UP)putc(ESC,stdout);
  44:     putc(ch, stdout);
  45: }
  46: 
  47: tobotleft ()
  48: {
  49:     move(-2048,-2048);
  50: }
  51: reset()
  52: {
  53:     outplot();
  54:     exit();
  55: }
  56: 
  57: float
  58: dist2 (x1, y1, x2, y2)
  59: {
  60:     float t,v;
  61:     t = x2-x1;
  62:     v = y1-y2;
  63:     return (t*t+v*v);
  64: }
  65: 
  66: swap (pa, pb)
  67: int *pa, *pb;
  68: {
  69:     int t;
  70:     t = *pa;
  71:     *pa = *pb;
  72:     *pb = t;
  73: }
  74: movep (xg, yg)
  75: {
  76:     int i,ch;
  77:     if((xg == xnow) && (yg == ynow))return;
  78:     /* if we need to go to left margin, just CR */
  79:     if (xg < xnow/2)
  80:     {
  81:         spew(CR);
  82:         xnow = 0;
  83:     }
  84:     i = (xg-xnow)/HORZRES;
  85:     if(xnow < xg)ch = RIGHT;
  86:     else ch = LEFT;
  87:     xnow += i*HORZRES;
  88:     i = abval(i);
  89:     while(i--)spew(ch);
  90:     i = abval(xg-xnow);
  91:     inplot();
  92:     while(i--) spew(ch);
  93:     outplot();
  94:     i=(yg-ynow)/VERTRES;
  95:     if(ynow < yg)ch = UP;
  96:     else ch = DOWN;
  97:     ynow += i*VERTRES;
  98:     i = abval(i);
  99:     while(i--)spew(ch);
 100:     i=abval(yg-ynow);
 101:     inplot();
 102:     while(i--)spew(ch);
 103:     outplot();
 104:     xnow = xg; ynow = yg;
 105: }
 106: 
 107: xsc(xi){
 108:     int xa;
 109:     xa = (xi - obotx) * scalex + botx;
 110:     return(xa);
 111: }
 112: ysc(yi){
 113:     int ya;
 114:     ya = (yi - oboty) *scaley +boty;
 115:     return(ya);
 116: }

Defined functions

Defined variables