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poly2d/: automatically switch between clockwise and counter-clockwise polygons

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The only functions that care about this at the moment are from CGAL,
and there we can determine from context what to do.
This commit is contained in:
Werner Almesberger
2012-05-07 22:12:21 -03:00
parent dfa85075e8
commit 46c8f8653c
5 changed files with 44 additions and 21 deletions
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24
poly2d/test/offset
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@@ -49,4 +49,28 @@ expect <<EOF
EOF
#------------------------------------------------------------------------------
tst "inner offset, polygon cw" <<EOF
struct p2d *p = p2d_new();
struct p2d *q;
p2d_append(p, v2d_new(0, 0));
p2d_append(p, v2d_new(0, 1));
p2d_append(p, v2d_new(2, 1));
p2d_append(p, v2d_new(2, 0));
p2d_close(p);
q = p2d_offset(p, -0.1);
p2d_write_gnuplot(stdout, q);
EOF
expect <<EOF
0.1 0.1
1.9 0.1
1.9 0.9
0.1 0.9
0.1 0.1
EOF
###############################################################################