void CreateTriangle(TileNode a, TileNode b, TileNode c)
{
_triangles.Add(a.VertexIndex);
_triangles.Add(b.VertexIndex);
_triangles.Add(c.VertexIndex);
TileTriangle triangle = new TileTriangle(a.VertexIndex, b.VertexIndex, c.VertexIndex);
AddTriangleToDictionary(triangle.VertexIndexA, triangle);
AddTriangleToDictionary(triangle.VertexIndexB, triangle);
AddTriangleToDictionary(triangle.VertexIndexC, triangle);
}
void AddTriangleToDictionary(int vertexIndexKey, TileTriangle triangle)
{
if (_triangleDictionary.ContainsKey(vertexIndexKey))
{
_triangleDictionary[vertexIndexKey].Add(triangle);
}
else
{
List <TileTriangle> triangleList = new List <TileTriangle>();
triangleList.Add(triangle);
_triangleDictionary.Add(vertexIndexKey, triangleList);
}
}
int GetConnectedOutlineVertex(int vertexIndex)
{
List <TileTriangle> trianglesContainingVertex = _triangleDictionary[vertexIndex];
for (int i = 0; i < trianglesContainingVertex.Count; i++)
{
TileTriangle triangle = trianglesContainingVertex[i];
for (int j = 0; j < 3; j++)
{
int vertexB = triangle[j];
if (vertexB != vertexIndex && !_checkedVertices.Contains(vertexB))
{
if (IsOutlineEdge(vertexIndex, vertexB))
{
return(vertexB);
}
}
}
}
return(-1);
}
