/// <summary>
/// Find the lines, if any, that make up the maximum independent set
/// of intersecting diagonals for determining where to slice our
/// initial polygon.
/// </summary>
private static Dictionary <Line, int> GetSliceMap(Dictionary <Line, List <Line> > intersectionGraph)
{
Dictionary <Line, int> sliceMap = new Dictionary <Line, int>();
int index = 1;
foreach (
var pair in intersectionGraph
.Where(pair => pair.Value.Count != 0)
.Where(pair => !sliceMap.ContainsKey(pair.Key))
)
{
sliceMap[pair.Key] = index++;
}
var vc = new VertexCover(sliceMap.Count);
foreach (var pair in intersectionGraph)
{
if (pair.Value.Count <= 0)
{
continue;
}
foreach (Line line in pair.Value)
{
int u = sliceMap[pair.Key];
int v = sliceMap[line];
vc.Add(u, v);
}
}
var vcData = vc.FindCover(sliceMap.Count);
if (vcData.Count <= 0)
{
return(sliceMap);
}
int smallest = vcData.Min(s => s.Size);
var set = vcData.FirstOrDefault(v => v.Size == smallest);
if (set == null)
{
return(sliceMap);
}
for (int i = 0; i < set.Size; i++)
{
var pair = sliceMap.FirstOrDefault(n => n.Value == set[i]);
sliceMap.Remove(pair.Key);
}
return(sliceMap);
}
/// <summary>
/// Find the lines, if any, that make up the maximum independent set
/// of intersecting diagonals for determining where to slice our
/// initial polygon.
/// </summary>
private static Dictionary<Line, int> GetSliceMap(Dictionary<Line, List<Line>> intersectionGraph)
{
Dictionary<Line, int> sliceMap = new Dictionary<Line, int>();
int index = 1;
foreach (
var pair in intersectionGraph
.Where(pair => pair.Value.Count != 0)
.Where(pair => !sliceMap.ContainsKey(pair.Key))
)
{
sliceMap[ pair.Key ] = index++;
}
var vc = new VertexCover(sliceMap.Count);
foreach (var pair in intersectionGraph)
{
if (pair.Value.Count <= 0)
{
continue;
}
foreach (Line line in pair.Value)
{
int u = sliceMap[ pair.Key ];
int v = sliceMap[ line ];
vc.Add(u, v);
}
}
var vcData = vc.FindCover(sliceMap.Count);
if (vcData.Count <= 0)
{
return sliceMap;
}
int smallest = vcData.Min(s => s.Size);
var set = vcData.FirstOrDefault(v => v.Size == smallest);
if (set == null)
{
return sliceMap;
}
for (int i = 0; i < set.Size; i++)
{
var pair = sliceMap.FirstOrDefault(n => n.Value == set[ i ]);
sliceMap.Remove(pair.Key);
}
return sliceMap;
}