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1	#!/bin/sh
2	. ./Common
3
4	###############################################################################
5
6	tst "outer offset" <<EOF
7	struct p2d *p = p2d_new();
8	struct p2d *q;
9
10	p2d_append(p, v2d_new(0, 0));
11	p2d_append(p, v2d_new(2, 0));
12	p2d_append(p, v2d_new(2, 1));
13	p2d_append(p, v2d_new(0, 1));
14	p2d_close(p);
15	q = p2d_offset(p, 0.5);
16	p2d_write_gnuplot(stdout, p2d_reverse(q->next));
17	EOF
18
19	expect <<EOF
20	-0.5 -0.5
21	2.5 -0.5
22	2.5 1.5
23	-0.5 1.5
24	-0.5 -0.5
25
26	EOF
27
28	#------------------------------------------------------------------------------
29
30	tst "inner offset" <<EOF
31	struct p2d *p = p2d_new();
32	struct p2d *q;
33
34	p2d_append(p, v2d_new(0, 0));
35	p2d_append(p, v2d_new(2, 0));
36	p2d_append(p, v2d_new(2, 1));
37	p2d_append(p, v2d_new(0, 1));
38	p2d_close(p);
39	q = p2d_offset(p, -0.1);
40	p2d_write_gnuplot(stdout, q);
41	EOF
42
43	expect <<EOF
44	0.1 0.1
45	1.9 0.1
46	1.9 0.9
47	0.1 0.9
48	0.1 0.1
49
50	EOF
51
52	#------------------------------------------------------------------------------
53
54	tst "inner offset, polygon cw" <<EOF
55	struct p2d *p = p2d_new();
56	struct p2d *q;
57
58	p2d_append(p, v2d_new(0, 0));
59	p2d_append(p, v2d_new(0, 1));
60	p2d_append(p, v2d_new(2, 1));
61	p2d_append(p, v2d_new(2, 0));
62	p2d_close(p);
63	q = p2d_offset(p, -0.1);
64	p2d_write_gnuplot(stdout, q);
65	EOF
66
67	expect <<EOF
68	0.1 0.1
69	1.9 0.1
70	1.9 0.9
71	0.1 0.9
72	0.1 0.1
73
74	EOF
75
76	###############################################################################
77

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