static public Slice2D Slice(Polygon polygon, List <Vector2f> slice)
{
Slice2D result = Slice2D.Create();
if (slice.Count < 2)
{
return(result);
}
// Normalize into clockwise
polygon.Normalize();
if (Slicer2D.complexSliceType != Slicer2D.SliceType.Regular)
{
result = SlicePolygonInside(polygon, slice);
if (result.polygons.Count > 0)
{
return(result);
}
}
// Optimization (holes?)
// if (polygon.SliceIntersectPoly (slice) == false)
// return(result);
List <List <Vector2f> > slices = new List <List <Vector2f> >();
bool entered = polygon.PointInPoly(slice.First());
List <Vector2f> currentSlice = new List <Vector2f> ();
foreach (Pair2f pair in Pair2f.GetList(slice, false))
{
List <Vector2f> stackList = polygon.GetListSliceIntersectPoly(pair);
stackList = VectorList2f.GetListSortedToPoint(stackList, pair.A);
foreach (Vector2f id in stackList)
{
if (entered == true)
{
currentSlice.Add(id);
slices.Add(currentSlice);
}
else
{
currentSlice = new List <Vector2f> ();
currentSlice.Add(id);
}
entered = !entered;
}
if (entered == true)
{
currentSlice.Add(pair.B);
}
}
// Adjusting split lines before performing convex split
result.AddPolygon(polygon);
foreach (List <Vector2f> id in slices)
{
if (id.Count > 1)
{
foreach (Vector2f p in id)
{
result.AddCollision(p);
}
// Sclice line points generated from intersections list
Vector2f vec0 = id.First();
vec0.Push(Vector2f.Atan2(vec0, id[1]), precision);
Vector2f vec1 = id.Last();
vec1.Push(Vector2f.Atan2(vec1, id[id.Count - 2]), precision);
// For each in polygons list attempt convex split
List <Polygon> temp = new List <Polygon>(result.polygons); // necessary?
foreach (Polygon poly in temp)
{
Slice2D resultList = SingleSlice(poly, id);
if (resultList.polygons.Count > 0)
{
foreach (Polygon i in resultList.polygons)
{
result.AddPolygon(i);
}
// If it's possible to perform convex split, remove parent polygon from result list
result.RemovePolygon(poly);
}
}
}
}
result.RemovePolygon(polygon);
return(result);
}
// Linear Slice
static public Slice2D Slice(Polygon polygon, Pair2f slice)
{
Slice2D result = Slice2D.Create();
// Normalize into clockwise
polygon.Normalize();
// Getting the list of intersections
List <Vector2f> intersections = polygon.GetListSliceIntersectPoly(slice);
// Sorting intersections from one point
intersections = VectorList2f.GetListSortedToPoint(intersections, slice.A);
if (intersections.Count < 2)
{
return(result);
}
List <Pair2f> collisionList = new List <Pair2f>();
// Dividing intersections into single slices - This method doesn't look like very reliable!!!
// Optimize this (polygon.PointInPoly) line // Fix this nonsense!!!
foreach (Pair2f p in Pair2f.GetList(intersections, false))
{
if (polygon.PointInPoly(new Vector2f((p.B.GetX() + p.A.GetX()) / 2, (p.B.GetY() + p.A.GetY()) / 2)) == true)
{
collisionList.Add(p);
intersections.Remove(p.A);
intersections.Remove(p.B);
}
}
result.AddPolygon(polygon);
// Slice line points generated from intersections list
foreach (Pair2f id in collisionList)
{
result.AddCollision(id.A);
result.AddCollision(id.B);
Vector2f vec0 = new Vector2f(id.A);
Vector2f vec1 = new Vector2f(id.B);
float rot = Vector2f.Atan2(vec0, vec1);
// Slightly pushing slice line so it intersect in all cases
vec0.Push(rot, precision);
vec1.Push(rot, -precision);
// For each in polygons list attempt convex split
foreach (Polygon poly in (new List <Polygon>(result.polygons)))
{
Slice2D resultList = SingleSlice(poly, new Pair2f(vec0, vec1));
if (resultList.polygons.Count > 0)
{
foreach (Polygon i in resultList.polygons)
{
result.AddPolygon(i);
}
// If it's possible to perform splice, remove currently sliced polygon from result list
result.RemovePolygon(poly);
}
}
}
result.RemovePolygon(polygon);
return(result);
}
// Slice From Point
static public Slice2D SliceFromPoint(Polygon polygon, Vector2f point, float rotation)
{
Slice2D result = Slice2D.Create();
// Normalize into clockwise
polygon.Normalize();
Vector2f sliceA = new Vector2f(point);
Vector2f sliceB = new Vector2f(point);
sliceA.Push(rotation, 1e+10f / 2);
sliceB.Push(rotation, -1e+10f / 2);
if (polygon.PointInPoly(point) == false)
{
return(result);
}
// Getting the list of intersections
List <Vector2f> intersectionsA = polygon.GetListSliceIntersectPoly(new Pair2f(point, sliceA));
List <Vector2f> intersectionsB = polygon.GetListSliceIntersectPoly(new Pair2f(point, sliceB));
// Sorting intersections from one point
if (intersectionsA.Count > 0 && intersectionsB.Count > 0)
{
sliceA = VectorList2f.GetListSortedToPoint(intersectionsA, point) [0];
sliceB = VectorList2f.GetListSortedToPoint(intersectionsB, point) [0];
}
else
{
return(result);
}
List <Pair2f> collisionList = new List <Pair2f>();
collisionList.Add(new Pair2f(sliceA, sliceB));
result.AddPolygon(polygon);
foreach (Pair2f id in collisionList)
{
// Sclice line points generated from intersections list
Vector2f vec0 = new Vector2f(id.A);
Vector2f vec1 = new Vector2f(id.B);
float rot = Vector2f.Atan2(vec0, vec1);
// Slightly pushing slice line so it intersect in all cases
vec0.Push(rot, LinearSlicer.precision);
vec1.Push(rot, -LinearSlicer.precision);
// For each in polygons list attempt convex split
List <Polygon> temp = new List <Polygon>(result.polygons); // necessary?
foreach (Polygon poly in temp)
{
// NO, that's the problem
Slice2D resultList = LinearSlicer.Slice(poly, new Pair2f(vec0, vec1));
if (resultList.polygons.Count > 0)
{
foreach (Polygon i in resultList.polygons)
{
result.AddPolygon(i);
}
// If it's possible to perform splice, remove parent polygon from result list
result.RemovePolygon(poly);
}
}
}
result.RemovePolygon(polygon);
return(result);
}