80 lines
1.4 KiB
C
80 lines
1.4 KiB
C
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
|
|
/* All Rights Reserved */
|
|
|
|
/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
|
|
/* The copyright notice above does not evidence any */
|
|
/* actual or intended publication of such source code. */
|
|
|
|
#ident "$Revision: 1.2 $"
|
|
|
|
#include "con.h"
|
|
#include "math.h"
|
|
|
|
/* external declarations */
|
|
extern int xconv(int);
|
|
extern int yconv(int);
|
|
extern int xsc(int);
|
|
extern int ysc(int);
|
|
extern void movep(int, int);
|
|
extern void inplot(void);
|
|
extern int abval(int);
|
|
extern void spew(int);
|
|
extern void outplot(void);
|
|
extern float dist2(int, int, int, int);
|
|
|
|
/* foward declarations */
|
|
void iline(int, int, int, int);
|
|
|
|
void
|
|
line(int x0, int y0, int x1, int y1)
|
|
{
|
|
iline(xconv(xsc(x0)),yconv(ysc(y0)),xconv(xsc(x1)),yconv(ysc(y1)));
|
|
return;
|
|
}
|
|
|
|
void
|
|
cont(int x0, int y0)
|
|
{
|
|
iline(xnow,ynow,xconv(xsc(x0)),yconv(ysc(y0)));
|
|
return;
|
|
}
|
|
|
|
void
|
|
iline(int cx0, int cy0, int cx1, int cy1)
|
|
{
|
|
int maxp,tt,j,np;
|
|
char chx,chy;
|
|
float xd,yd;
|
|
|
|
movep(cx0,cy0);
|
|
maxp = sqrt(dist2(cx0,cy0,cx1,cy1))/2.;
|
|
xd = cx1-cx0;
|
|
yd = cy1-cy0;
|
|
if(xd >= 0)chx = RIGHT;
|
|
else chx = LEFT;
|
|
if(yd >= 0)chy = UP;
|
|
else chy = DOWN;
|
|
if(maxp==0){
|
|
xd=0;
|
|
yd=0;
|
|
}
|
|
else{
|
|
xd /=maxp;
|
|
yd /=maxp;
|
|
}
|
|
inplot();
|
|
for (tt=0; tt<=maxp; tt++){
|
|
j= cx0+xd*tt-xnow;
|
|
xnow += j;
|
|
j = abval(j);
|
|
while(j-- > 0)spew(chx);
|
|
j = cy0+yd*tt-ynow;
|
|
ynow += j;
|
|
j = abval(j);
|
|
while(j-- > 0)spew(chy);
|
|
spew ('.');
|
|
}
|
|
outplot();
|
|
return;
|
|
}
|