1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "con.h"
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,command;
float xd,yd;
float dist2(),sqrt();
movep(cx0,cy0);
maxp = sqrt(dist2(cx0,cy0,cx1,cy1))/2.;
xd = cx1-cx0;
yd = cy1-cy0;
command = COM|((xd<0)<<1)|(yd<0);
if(maxp == 0){
xd=0;
yd=0;
}
else {
xd /= maxp;
yd /= maxp;
}
inplot();
spew(command);
for (tt=0; tt<=maxp; tt++){
chx= cx0+xd*tt-xnow;
xnow += chx;
chx = abval(chx);
chy = cy0+yd*tt-ynow;
ynow += chy;
chy = abval(chy);
spew(ADDR|chx<<3|chy);
}
outplot();
return;
}
|
