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CG-lab >> CG-lab > convex_hull_2

convex_hull_2

convex hull of a set of points in the plane.

Calling Sequence

[nhull,ind] = convex_hull_2(xy);

Parameters

xy
: 2 x n real matrix of coordinates.
nhull
: integer
ind
: integer row vector

Examples

if atomsIsLoaded("metanet") then
ta=[27 27 3 12 11 12 27 26 26 25 25 24 23 23 21 22 21 20 19 18 18];
ta=[ta  16 15 15 14 12 9 10 6 9 17 8 17 10 20 11 23 23 12 18 28];
he=[ 1  2 2  4  5 11 13  1 25 22 24 22 22 19 13 13 14 16 16  9 16];
he=[he  10 10 11 12  2 6  5 5 7  8 7  9  6 11  4 18 13  3 28 17];
g=make_graph('foo',0,28,ta,he);
xx=[46 120 207 286 366 453 543 544 473 387 300 206 136 250 346 408];
g('node_x')=[xx 527 443 306 326 196 139 264  55  58  46 118 513];
yy=[36  34  37  40  38  40  35 102 102  98  93  96 167 172 101 179];
g('node_y')=[yy 198 252 183 148 172 256 259 258 167 109 104 253];
show_graph(g);
xy=[g('node_x');g('node_y')];
[nhull,ind] = convex_hull_2(xy);
show_nodes(ind);
end;

See Also

For more details see CGAL Manual.

This function uses the Convex_hull_2 package of CGAL, which is under LGPL license. See License Terms

Authors

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