internal RtreeRnPage(Storage storage, object obj, RectangleRn r)
{
branch = storage.CreateLink(card);
branch.Length = card;
b = new RectangleRn[card];
setBranch(0, new RectangleRn(r), obj);
n = 1;
}
internal RectangleRn cover()
{
RectangleRn r = new RectangleRn(b[0]);
for (int i = 1; i < n; i++)
{
r.Join(b[i]);
}
return(r);
}
RtreeRnPage addBranch(Storage storage, RectangleRn r, object obj)
{
if (n < card)
{
setBranch(n++, r, obj);
return(null);
}
else
{
return(splitPage(storage, r, obj));
}
}
public object[] Get(RectangleRn r)
#endif
{
ArrayList result = new ArrayList();
if (root != null)
{
root.find(r, result, height);
}
#if USE_GENERICS
return((T[])result.ToArray(typeof(T)));
#else
return(result.ToArray());
#endif
}
internal RtreeEnumerator(RtreeRn tree, RectangleRn r)
#endif
{
counter = tree.updateCounter;
height = tree.height;
this.tree = tree;
if (height == 0)
{
return;
}
this.r = r;
pageStack = new RtreeRnPage[height];
posStack = new int[height];
Reset();
}
internal RtreeRnPage insert(Storage storage, RectangleRn r, object obj, int level)
{
Modify();
if (--level != 0)
{
// not leaf page
int i, mini = 0;
double minIncr = Double.MaxValue;
double minArea = Double.MaxValue;
for (i = 0; i < n; i++)
{
double area = b[i].Area();
double incr = RectangleRn.JoinArea(b[i], r) - area;
if (incr < minIncr)
{
minIncr = incr;
minArea = area;
mini = i;
}
else if (incr == minIncr && area < minArea)
{
minArea = area;
mini = i;
}
}
RtreeRnPage p = (RtreeRnPage)branch[mini];
RtreeRnPage q = p.insert(storage, r, obj, level);
if (q == null)
{
// child was not split
b[mini].Join(r);
return(null);
}
else
{
// child was split
setBranch(mini, p.cover(), p);
return(addBranch(storage, q.cover(), q));
}
}
else
{
return(addBranch(storage, new RectangleRn(r), obj));
}
}
public void Unpack(ObjectReader reader)
{
n = reader.ReadInt32();
branch = (Link)reader.ReadObject();
card = branch.Count;
int nDims = ((Page.pageSize - ObjectHeader.Sizeof - 12) / card - 4) / 16;
double[] coords = new double[nDims * 2];
b = new RectangleRn[card];
for (int i = 0; i < n; i++)
{
for (int j = 0; j < nDims; j++)
{
coords[j] = reader.ReadDouble();
coords[j + nDims] = reader.ReadDouble();
}
b[i] = new RectangleRn(coords);
}
}
internal int remove(RectangleRn r, object obj, int level, ArrayList reinsertList)
{
if (--level != 0)
{
for (int i = 0; i < n; i++)
{
if (r.Intersects(b[i]))
{
RtreeRnPage pg = (RtreeRnPage)branch[i];
int reinsertLevel = pg.remove(r, obj, level, reinsertList);
if (reinsertLevel >= 0)
{
if (pg.n >= card / 2)
{
setBranch(i, pg.cover(), pg);
Modify();
}
else
{
// not enough entries in child
reinsertList.Add(pg);
reinsertLevel = level - 1;
removeBranch(i);
}
return(reinsertLevel);
}
}
}
}
else
{
for (int i = 0; i < n; i++)
{
if (branch.ContainsElement(i, obj))
{
removeBranch(i);
return(0);
}
}
}
return(-1);
}
public void Remove(RectangleRn r, object obj)
#endif
{
if (root == null)
{
throw new StorageError(StorageError.ErrorCode.KEY_NOT_FOUND);
}
ArrayList reinsertList = new ArrayList();
int reinsertLevel = root.remove(r, obj, height, reinsertList);
if (reinsertLevel < 0)
{
throw new StorageError(StorageError.ErrorCode.KEY_NOT_FOUND);
}
for (int i = reinsertList.Count; --i >= 0;)
{
RtreeRnPage p = (RtreeRnPage)reinsertList[i];
for (int j = 0, pn = p.n; j < pn; j++)
{
RtreeRnPage q = root.insert(Storage, p.b[j], p.branch[j], height - reinsertLevel);
if (q != null)
{
// root splitted
root = new RtreeRnPage(Storage, root, q);
height += 1;
}
}
reinsertLevel -= 1;
p.Deallocate();
}
if (root.n == 1 && height > 1)
{
RtreeRnPage newRoot = (RtreeRnPage)root.branch[0];
root.Deallocate();
root = newRoot;
height -= 1;
}
n -= 1;
updateCounter += 1;
Modify();
}
public void Put(RectangleRn r, object obj)
#endif
{
if (root == null)
{
root = new RtreeRnPage(Storage, obj, r);
height = 1;
}
else
{
RtreeRnPage p = root.insert(Storage, r, obj, height);
if (p != null)
{
root = new RtreeRnPage(Storage, root, p);
height += 1;
}
}
n += 1;
updateCounter += 1;
Modify();
}
internal void find(RectangleRn r, ArrayList result, int level)
{
if (--level != 0)
{ /* this is an internal node in the tree */
for (int i = 0; i < n; i++)
{
if (r.Intersects(b[i]))
{
((RtreeRnPage)branch[i]).find(r, result, level);
}
}
}
else
{ /* this is a leaf node */
for (int i = 0; i < n; i++)
{
if (r.Intersects(b[i]))
{
result.Add(branch[i]);
}
}
}
}
public IEnumerable <T> Overlaps(RectangleRn r)
public void Remove(RectangleRn r, T obj)
internal RtreeEntryEnumerator(RtreeRn tree, RectangleRn r)
#endif
: base(tree, r)
{
}
internal RtreeEntryEnumerator(RtreeRn <T> tree, RectangleRn r)
public void Put(RectangleRn r, T obj)
void setBranch(int i, RectangleRn r, object obj)
{
b[i] = r;
branch[i] = obj;
}
internal RtreeEnumerable(RtreeRn tree, RectangleRn r)
#endif
{
this.tree = tree;
this.r = r;
}
internal RtreeEnumerable(RtreeRn <T> tree, RectangleRn r)
public IDictionaryEnumerator GetDictionaryEnumerator(RectangleRn r)
{
return(new RtreeEntryEnumerator(this, r));
}
public IEnumerable Overlaps(RectangleRn r)
#endif
{
return(new RtreeEnumerable(this, r));
}
RtreeRnPage splitPage(Storage storage, RectangleRn r, object obj)
{
int i, j, seed0 = 0, seed1 = 0;
double[] rectArea = new double[card + 1];
double waste;
double worstWaste = Double.MinValue;
//
// As the seeds for the two groups, find two rectangles which waste
// the most area if covered by a single rectangle.
//
rectArea[0] = r.Area();
for (i = 0; i < card; i++)
{
rectArea[i + 1] = b[i].Area();
}
RectangleRn bp = r;
for (i = 0; i < card; i++)
{
for (j = i + 1; j <= card; j++)
{
waste = RectangleRn.JoinArea(bp, b[j - 1]) - rectArea[i] - rectArea[j];
if (waste > worstWaste)
{
worstWaste = waste;
seed0 = i;
seed1 = j;
}
}
bp = b[i];
}
byte[] taken = new byte[card];
RectangleRn group0, group1;
double groupArea0, groupArea1;
int groupCard0, groupCard1;
RtreeRnPage pg;
taken[seed1 - 1] = 2;
group1 = new RectangleRn(b[seed1 - 1]);
if (seed0 == 0)
{
group0 = new RectangleRn(r);
pg = new RtreeRnPage(storage, obj, r);
}
else
{
group0 = new RectangleRn(b[seed0 - 1]);
pg = new RtreeRnPage(storage, branch.GetRaw(seed0 - 1), group0);
setBranch(seed0 - 1, r, obj);
}
groupCard0 = groupCard1 = 1;
groupArea0 = rectArea[seed0];
groupArea1 = rectArea[seed1];
//
// Split remaining rectangles between two groups.
// The one chosen is the one with the greatest difference in area
// expansion depending on which group - the rect most strongly
// attracted to one group and repelled from the other.
//
while (groupCard0 + groupCard1 < card + 1 &&
groupCard0 < card + 1 - card / 2 &&
groupCard1 < card + 1 - card / 2)
{
int betterGroup = -1, chosen = -1;
double biggestDiff = -1;
for (i = 0; i < card; i++)
{
if (taken[i] == 0)
{
double diff = (RectangleRn.JoinArea(group0, b[i]) - groupArea0)
- (RectangleRn.JoinArea(group1, b[i]) - groupArea1);
if (diff > biggestDiff || -diff > biggestDiff)
{
chosen = i;
if (diff < 0)
{
betterGroup = 0;
biggestDiff = -diff;
}
else
{
betterGroup = 1;
biggestDiff = diff;
}
}
}
}
Debug.Assert(chosen >= 0);
if (betterGroup == 0)
{
group0.Join(b[chosen]);
groupArea0 = group0.Area();
taken[chosen] = 1;
pg.setBranch(groupCard0++, b[chosen], branch.GetRaw(chosen));
}
else
{
groupCard1 += 1;
group1.Join(b[chosen]);
groupArea1 = group1.Area();
taken[chosen] = 2;
}
}
//
// If one group gets too full, then remaining rectangle are
// split between two groups in such way to balance cards of two groups.
//
if (groupCard0 + groupCard1 < card + 1)
{
for (i = 0; i < card; i++)
{
if (taken[i] == 0)
{
if (groupCard0 >= groupCard1)
{
taken[i] = 2;
groupCard1 += 1;
}
else
{
taken[i] = 1;
pg.setBranch(groupCard0++, b[i], branch.GetRaw(i));
}
}
}
}
pg.n = groupCard0;
n = groupCard1;
for (i = 0, j = 0; i < groupCard1; j++)
{
if (taken[j] == 2)
{
setBranch(i++, b[j], branch.GetRaw(j));
}
}
// truncate rest of link
branch.Length = groupCard1;
branch.Length = card;
return(pg);
}
public T[] Get(RectangleRn r)
