131 lines
1.9 KiB
C
Executable File
131 lines
1.9 KiB
C
Executable File
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ident "@(#)subr.c 1.2 90/11/01 SMI" /* SVr4.0 1.1 */
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/*
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* Copyright (c) 1983, 1984 1985, 1986, 1987, 1988, Sun Microsystems, Inc.
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* All Rights Reserved.
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*/
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#include <stdio.h>
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#include "con.h"
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abval(q)
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{
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return (q>=0 ? q : -q);
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}
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xconv (xp)
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{
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/* x position input is -2047 to +2047, output must be 0 to PAGSIZ*HORZRES */
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xp += 2048;
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/* the computation is newx = xp*(PAGSIZ*HORZRES)/4096 */
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return (xoffset + xp /xscale);
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}
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yconv (yp)
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{
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/* see description of xconv */
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yp += 2048;
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return (yp / yscale);
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}
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inplot()
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{
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spew (ESC);
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spew(PLOTIN);
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}
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outplot()
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{
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spew(ESC);
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spew(PLOTOUT);
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fflush(stdout);
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}
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spew(ch)
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{
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if(ch == UP){
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putc(ESC,stdout);
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ch = DOWN;
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}
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putc(ch, stdout);
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}
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tobotleft ()
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{
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move(-2048,-2048);
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}
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reset()
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{
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signal(2,1);
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outplot();
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stty(OUTF,&ITTY);
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exit(0);
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}
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float
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dist2 (x1, y1, x2, y2)
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{
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float t,v;
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t = x2-x1;
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v = y1-y2;
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return (t*t+v*v);
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}
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swap (pa, pb)
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int *pa, *pb;
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{
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int t;
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t = *pa;
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*pa = *pb;
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*pb = t;
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}
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movep (xg,yg)
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{
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int i,ch;
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if((xg == xnow) && (yg == ynow))return;
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/* if we need to go to left margin, just CR */
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if (xg < xnow/2)
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{
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spew(CR);
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xnow = 0;
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}
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i = (xg-xnow)/HORZRES;
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if(xnow < xg)ch = RIGHT;
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else ch = LEFT;
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xnow += i*HORZRES;
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i = abval(i);
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while(i--)spew(ch);
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i = abval(xg-xnow);
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inplot();
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while(i--) spew(ch);
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outplot();
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i=(yg-ynow)/VERTRES;
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if(ynow < yg)ch = UP;
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else ch = DOWN;
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ynow += i*VERTRES;
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i = abval(i);
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while(i--)spew(ch);
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i=abval(yg-ynow);
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inplot();
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while(i--)spew(ch);
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outplot();
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xnow = xg; ynow = yg;
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}
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xsc(xi){
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int xa;
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xa = (xi - obotx) * scalex + botx;
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return(xa);
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}
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ysc(yi){
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int ya;
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ya = (yi - oboty) *scaley +boty;
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return(ya);
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}
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