private string CreatePolygonString(Polygon p)
{
List<string> edgeStrings = new List<string>();
foreach (HalfEdge he in p.HalfEdges)
edgeStrings.Add(CreateHalfEdgeString(he, p));
return "{\"id\": " + p.Id + ", \"edges\": [" + String.Join(",", edgeStrings) + "]}";
}
public void AddPolygon(Polygon polygon)
{
polygons.Add(polygon);
foreach (Edge e in polygon.Edges)
{
long edgeKey = GetEdgeKey(e);
if (!EdgePolygons.ContainsKey(edgeKey))
EdgePolygons.Add(edgeKey, new List<Polygon>());
EdgePolygons[edgeKey].Add(polygon);
}
}
private string CreateHalfEdgeString(HalfEdge he, Polygon p)
{
long edgeKey = pe.GetEdgeKey(he.Edge);
Polygon neighbor = null;
foreach (Polygon candidate in pe.EdgePolygons[edgeKey])
if (candidate != p)
neighbor = candidate;
string neighborStr = (neighbor != null) ? neighbor.Id.ToString() : "-1";
List<string> xp = new List<string>();
List<string> yp = new List<string>();
Point[] points = he.GetPoints();
foreach (Point op in points)
{
PointF cp = ConvertPoint(op);
xp.Add(cp.X.ToString(CultureInfo.InvariantCulture));
yp.Add(cp.Y.ToString(CultureInfo.InvariantCulture));
}
string xPoints = String.Join(",", xp);
string yPoints = String.Join(",", yp);
return "{\"neighbor\": " + neighborStr + ", \"xpoints\": [" + xPoints + "], \"ypoints\": [" + yPoints + "]}";
}
public List<Polygon> ExtractPolygons()
{
Dictionary<long,bool> vistedHalfEdges = new Dictionary<long,bool>();
polygons = new List<Polygon>();
foreach (Node n in Nodes)
{
int nodeKey = GetNodeKey(n);
foreach (HalfEdge he in NodeHalfEdges[nodeKey])
{
long halfEdgeKey = GetHalfEdgeKey(he);
if (!vistedHalfEdges.ContainsKey(halfEdgeKey))
{
List<HalfEdge> edgesList = new List<HalfEdge>();
HalfEdge currentHalfEdge = he;
long currentKey = GetHalfEdgeKey(currentHalfEdge);
edgesList.Add(currentHalfEdge);
vistedHalfEdges.Add(currentKey, true);
bool deadEnd = false;
while (currentHalfEdge.End != n && !deadEnd)
{
currentHalfEdge = FindNextUnvisitedHalfEdge(currentHalfEdge, vistedHalfEdges);
if (currentHalfEdge == null)
{
deadEnd = true;
break;
}
currentKey = GetHalfEdgeKey(currentHalfEdge);
edgesList.Add(currentHalfEdge);
vistedHalfEdges.Add(currentKey, true);
}
Polygon polygon = new Polygon(edgesList, polygons.Count);
if (!deadEnd && polygon.IsClockWise())
AddPolygon(polygon);
else
{
foreach (HalfEdge used in edgesList)
{
long key = GetHalfEdgeKey(used);
vistedHalfEdges.Remove(key);
}
}
}
}
}
CreateNeighborLists();
return polygons;
}
