/// <summary>
/// Checks if the other group's outer perimeter is inside this group's perimeter. Inclusive of the two groups
/// sharing vertices.
/// </summary>
/// <param name="otherGroup"></param>
/// <returns>True if the other group is inside this group, false otherwise.</returns>
public bool IsOtherGroupInThisGroup(ConnectedNodeGroup otherGroup)
{
HashSet <Vector2> sharedVertices = this.GetSharedVertices(otherGroup);
if (sharedVertices.Count == 0)
{
return(GeometryFuncs.IsPolyInPoly(otherGroup.outerPerimSimplified, this.outerPerimSimplified));
}
else
{
bool isInside = true;
foreach (PolygonSplittingGraphNode node in otherGroup.nodes.Values)
{
var nodeCoord = new Vector2(node.x, node.y);
if (sharedVertices.Contains(nodeCoord))
{
continue;
}
if (!GeometryFuncs.IsPointInPoly(nodeCoord, this.outerPerimSimplified))
{
isInside = false;
break;
}
}
return(isInside);
}
}
/// <summary>
/// Checks which potential holes could be contained within this polygon and adds them
/// to holes if they pass the IsPolyInPoly check.
/// </summary>
/// <param name="potentialHoles"></param>
/// <returns></returns>
private List <Vector2>[] _GetContainedHoles(List <Vector2>[] potentialHoles)
{
var confirmedHoles = new List <List <Vector2> >();
foreach (List <Vector2> hole in potentialHoles)
{
HashSet <Vector2> sharedVertices;
if (GeometryFuncs.IsPolyInPoly(hole.ToArray(), this._outerPerim))
{
confirmedHoles.Add(hole);
}
else if ((sharedVertices = this._GetHoleSharedVertices(hole)).Count > 0)
{
int holeVerticesInPoly = 0; //guilty until proven innocent, to prevent snake poly from containing hole
foreach (Vector2 holeVertex in hole)
{
if (sharedVertices.Contains(holeVertex))
{
continue;
}
if (GeometryFuncs.IsPointInPoly(holeVertex, this._outerPerim) &&
!GeometryFuncs.IsPointOnPolyBoundary(holeVertex, this._outerPerim))
{
holeVerticesInPoly++;
}
}
if (holeVerticesInPoly > 0)
{
confirmedHoles.Add(hole);
}
}
}
return(confirmedHoles.ToArray());
}