private IEnumerable <PolygonChanged> OutGoingForPointRange(int index, int range)
{
var polygonMutations = Diagonalizes.DiagonalizeListRate(ListUtil.FromTo(index, index + range - 1).SelectList(i =>
GetPointMutationsForIndex(i % Polygon.Points.Count)), 2).ConcatUtil().Select(xs => CombinePointMutations(xs.ToLazyList()));
var changedPolygons = polygonMutations.Select(polygon => new PolygonChanged(polygon, 0));
var withoutSelfIntersections = changedPolygons.Where(changedPolygon => !changedPolygon.NewPolygon.IsSelfIntersecting());
return(withoutSelfIntersections);
}
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);
}
