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
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.2 */
#include <stdlib.h>
#include <math.h>
#include <plot.h>
#include "con.h"
static void
iline(int cx0, int cy0, int cx1, int cy1)
{
int maxp, tt, j;
char chx, chy;
float xd, yd;
movep(cx0, cy0);
maxp = (int)(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 = (int)(cx0 + xd * tt - xnow);
xnow += j;
j = abs(j);
while (j-- > 0)
spew(chx);
j = (int)(cy0 + yd * tt - ynow);
ynow += j;
j = abs(j);
while (j-- > 0)
spew(chy);
spew('.');
}
outplot();
}
void
line(short x0, short y0, short x1, short y1)
{
iline(xconv(xsc(x0)), yconv(ysc(y0)),
xconv(xsc(x1)), yconv(ysc(y1)));
}
void
cont(short x0, short y0)
{
iline(xnow, ynow, xconv(xsc(x0)), yconv(ysc(y0)));
}
|
