private IEnumerable <PointMutation> GetPointMutationsForIndex(int index)
{
var removedPointPolygons = ListUtil.Singleton((PointMutation) new DeletedPoint(index));
var changedPointPolygons = MutatePoint(index);
var insertedPointPolygons = EnumerableUtil.From(0).Select(i => InsertPoint(index));
var changedInserted = EnumerableUtil.ConcatUtil(changedPointPolygons, insertedPointPolygons);
var changedInsertedDiagonal = Diagonalizes.DiagonalizeListRateEmpty(changedInserted, 2).ConcatUtil().Select(xs => CombineAddedChangedMutations(xs.ToLazyList()));
var combined = removedPointPolygons.Concat(changedInsertedDiagonal);
return(combined);
}
public IEnumerable <PolygonChanged> OutGoingForPoint(int index)
{
var changedPointPolygons = MutatePoint(index);
var insertedPointPolygons = InsertPoint(index);
var removedPointPolygons = ListUtil.Singleton(RemovePoint(index));
var changeInsertPolygons = ListUtil.New <IEnumerable <IList <PolygonChanged> > >(
changedPointPolygons.DivideInfinite(CHANGES_PER_INSERT), insertedPointPolygons.Select(
x => ListUtil.New(x))).Intertwine().SelectMany(x => x);
var combined = removedPointPolygons.Concat(changeInsertPolygons);
return(combined.Where(x => !x.NewPolygon.IsSelfIntersecting()));
}
private IEnumerable <PointMutation> InsertPoint(int pointIndex)
{
var mid = (Polygon.Points[pointIndex] + Polygon.Points[(pointIndex + 1) % Polygon.Points.Count]) / 2;
return(discreteSpiralPointMutation.SpiralPoints(mid).Select(point => (PointMutation) new AddedPoints(pointIndex, ListUtil.Singleton(point))));
}