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["Ophir Setter" <>]

Just a guess. Try:
2/1 5/1
15/10 35/10
3/1 3/1
35/10 4/10

Instead of:
2/1 5/1
1.5/1 3.5/1
3/1 3/1
3.5/1 4/1

On Nov 15, 2007 8:15 PM, <> wrote:

I write a code and within it I want to check whether it is simple or not:

 Rational               x, y;
 std::list<Rat_point_2> vertices;

 for (j = 0; j < n_vertices; j++)
 {
   ifile >> x >> y;
   vertices.push_back (Rat_point_2 (x, y));
 }

 Rat_polygon_2        pgn (vertices.begin(), vertices.end());

 if (! pgn.is_simple())
 {
   std::cerr << "Error - Polygon no. " << i + 1
             << " is not simple." << std::endl;
   return (false);
 }

for a polygon like:
2/1 5/1
1.5/1 3.5/1
3/1 3/1
3.5/1 4/1

the program found it is not simple!!!, I checked the usage of is_simple() with the one in the example\polygon
and they are similar.

but for a polygon like:
1/1 1/1
1/1 2/1
2/1 2/1
2/1 1/1
the program finds it as simple.

what checks should I do more?
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