public static void FinalizeSubCurves(ArrayList subcurves, ArrayList chains)
{
int numchains = chains.Count;
if (numchains == 0)
{
return;
}
if ((numchains & 1) != 0)
{
throw new SystemException("Odd number of chains!");
}
var tempArray = chains.ToArray();
ChainEnd[] endlist = new ChainEnd[tempArray.Length];
for (int i = 0; i < tempArray.Length; i++)
{
endlist[i] = tempArray[i] as ChainEnd;
}
for (int i = 1; i < numchains; i += 2)
{
ChainEnd open = endlist[i - 1];
ChainEnd close = endlist[i];
CurveLink subcurve = open.LinkTo(close);
if (subcurve != null)
{
subcurves.Add(subcurve);
}
}
chains.Clear();
}
public ChainEnd(CurveLink first, ChainEnd partner)
{
_head = first;
_tail = first;
_partner = partner;
_etag = first.GetEdgeTag();
}
public ChainEnd(CurveLink first, ChainEnd partner)
{
_head = first;
_tail = first;
_partner = partner;
_etag = first.GetEdgeTag();
}
public static void FinalizeSubCurves(ArrayList subcurves, ArrayList chains)
{
int numchains = chains.Count;
if (numchains == 0)
{
return;
}
if ((numchains & 1) != 0)
{
throw new SystemException("Odd number of chains!");
}
var tempArray = chains.ToArray();
ChainEnd[] endlist = new ChainEnd[tempArray.Length];
for (int i = 0; i < tempArray.Length; i++)
{
endlist[i] = tempArray[i] as ChainEnd;
}
for (int i = 1; i < numchains; i += 2)
{
ChainEnd open = endlist[i - 1];
ChainEnd close = endlist[i];
CurveLink subcurve = open.LinkTo(close);
if (subcurve != null)
{
subcurves.Add(subcurve);
}
}
chains.Clear();
}
/*
* Returns head of a complete chain to be added to subcurves
* or null if the links did not complete such a chain.
*/
public CurveLink LinkTo(ChainEnd that)
{
if (_etag == AreaOp.ETAG_IGNORE ||
that._etag == AreaOp.ETAG_IGNORE)
{
throw new SystemException("ChainEnd linked more than once!");
}
if (_etag == that._etag)
{
throw new SystemException("Linking chains of the same type!");
}
ChainEnd enter, exit;
// assert(partner.etag != that.partner.etag);
if (_etag == AreaOp.ETAG_ENTER)
{
enter = this;
exit = that;
}
else
{
enter = that;
exit = this;
}
// Now make sure these ChainEnds are not linked to any others...
_etag = AreaOp.ETAG_IGNORE;
that._etag = AreaOp.ETAG_IGNORE;
// Now link everything up...
enter._tail.SetNext(exit._head);
enter._tail = exit._tail;
if (_partner == that)
{
// Curve has closed on itself...
return(enter._head);
}
// Link this chain into one end of the chain formed by the partners
ChainEnd otherenter = exit._partner;
ChainEnd otherexit = enter._partner;
otherenter._partner = otherexit;
otherexit._partner = otherenter;
if (enter._head.GetYTop() < otherenter._head.GetYTop())
{
enter._tail.SetNext(otherenter._head);
otherenter._head = enter._head;
}
else
{
otherexit._tail.SetNext(enter._head);
otherexit._tail = enter._tail;
}
return(null);
}
/*
* Returns head of a complete chain to be added to subcurves
* or null if the links did not complete such a chain.
*/
public CurveLink LinkTo(ChainEnd that)
{
if (_etag == AreaOp.ETAG_IGNORE ||
that._etag == AreaOp.ETAG_IGNORE)
{
throw new SystemException("ChainEnd linked more than once!");
}
if (_etag == that._etag)
{
throw new SystemException("Linking chains of the same type!");
}
ChainEnd enter, exit;
// assert(partner.etag != that.partner.etag);
if (_etag == AreaOp.ETAG_ENTER)
{
enter = this;
exit = that;
}
else
{
enter = that;
exit = this;
}
// Now make sure these ChainEnds are not linked to any others...
_etag = AreaOp.ETAG_IGNORE;
that._etag = AreaOp.ETAG_IGNORE;
// Now link everything up...
enter._tail.SetNext(exit._head);
enter._tail = exit._tail;
if (_partner == that)
{
// Curve has closed on itself...
return enter._head;
}
// Link this chain into one end of the chain formed by the partners
ChainEnd otherenter = exit._partner;
ChainEnd otherexit = enter._partner;
otherenter._partner = otherexit;
otherexit._partner = otherenter;
if (enter._head.GetYTop() < otherenter._head.GetYTop())
{
enter._tail.SetNext(otherenter._head);
otherenter._head = enter._head;
}
else
{
otherexit._tail.SetNext(enter._head);
otherexit._tail = enter._tail;
}
return null;
}
public void SetOtherEnd(ChainEnd partner)
{
_partner = partner;
}
public static void ResolveLinks(ArrayList subcurves,
ArrayList chains,
ArrayList links)
{
int numlinks = links.Count;
CurveLink[] linklist;
if (numlinks == 0)
{
linklist = EmptyLinkList;
}
else
{
if ((numlinks & 1) != 0)
{
throw new SystemException("Odd number of new curves!");
}
var tempArray = links.ToArray();
linklist = new CurveLink[numlinks + 2];
for (int i = 0; i < tempArray.Length; i++)
{
linklist[i] = tempArray[i] as CurveLink;
}
}
int numchains = chains.Count;
ChainEnd[] endlist;
if (numchains == 0)
{
endlist = EmptyChainList;
}
else
{
if ((numchains & 1) != 0)
{
throw new SystemException("Odd number of chains!");
}
var tempArray = chains.ToArray();
endlist = new ChainEnd[numchains + 2];
for (int i = 0; i < tempArray.Length; i++)
{
endlist[i] = tempArray[i] as ChainEnd;
}
}
int curchain = 0;
int curlink = 0;
chains.Clear();
ChainEnd chain = endlist[0];
ChainEnd nextchain = endlist[1];
CurveLink link = linklist[0];
CurveLink nextlink = linklist[1];
while (chain != null || link != null)
{
/*
* Strategy 1:
* Connect chains or links if they are the only things left...
*/
bool connectchains = (link == null);
bool connectlinks = (chain == null);
if (!connectchains && !connectlinks)
{
// assert(link != null && chain != null);
/*
* Strategy 2:
* Connect chains or links if they close off an open area...
*/
if (nextchain != null)
{
connectchains = ((curchain & 1) == 0 &&
chain.GetX() == nextchain.GetX());
}
if (nextlink != null)
{
connectlinks = ((curlink & 1) == 0 &&
link.GetX() == nextlink.GetX());
if (!connectchains && !connectlinks)
{
/*
* Strategy 3:
* Connect chains or links if their successor is
* between them and their potential connectee...
*/
double cx = chain.GetX();
double lx = link.GetX();
connectchains =
(nextchain != null && cx < lx &&
Obstructs(nextchain.GetX(), lx, curchain));
connectlinks =
(lx < cx &&
Obstructs(nextlink.GetX(), cx, curlink));
}
}
}
if (connectchains)
{
CurveLink subcurve = chain.LinkTo(nextchain);
if (subcurve != null)
{
subcurves.Add(subcurve);
}
curchain += 2;
chain = endlist[curchain];
nextchain = endlist[curchain + 1];
}
if (connectlinks)
{
ChainEnd openend = new ChainEnd(link, null);
ChainEnd closeend = new ChainEnd(nextlink, openend);
openend.SetOtherEnd(closeend);
chains.Add(openend);
chains.Add(closeend);
curlink += 2;
link = linklist[curlink];
nextlink = linklist[curlink + 1];
}
if (!connectchains && !connectlinks)
{
// assert(link != null);
// assert(chain != null);
// assert(chain.getEtag() == link.getEtag());
chain.AddLink(link);
chains.Add(chain);
curchain++;
chain = nextchain;
nextchain = endlist[curchain + 1];
curlink++;
link = nextlink;
nextlink = linklist[curlink + 1];
}
}
}
public void SetOtherEnd(ChainEnd partner)
{
_partner = partner;
}
public static void ResolveLinks(ArrayList subcurves,
ArrayList chains,
ArrayList links)
{
int numlinks = links.Count;
CurveLink[] linklist;
if (numlinks == 0)
{
linklist = EmptyLinkList;
}
else
{
if ((numlinks & 1) != 0)
{
throw new SystemException("Odd number of new curves!");
}
var tempArray = links.ToArray();
linklist = new CurveLink[numlinks + 2];
for (int i = 0; i < tempArray.Length; i++)
{
linklist[i] = tempArray[i] as CurveLink;
}
}
int numchains = chains.Count;
ChainEnd[] endlist;
if (numchains == 0)
{
endlist = EmptyChainList;
}
else
{
if ((numchains & 1) != 0)
{
throw new SystemException("Odd number of chains!");
}
var tempArray = chains.ToArray();
endlist = new ChainEnd[numchains+2];
for (int i = 0; i < tempArray.Length; i++)
{
endlist[i] = tempArray[i] as ChainEnd;
}
}
int curchain = 0;
int curlink = 0;
chains.Clear();
ChainEnd chain = endlist[0];
ChainEnd nextchain = endlist[1];
CurveLink link = linklist[0];
CurveLink nextlink = linklist[1];
while (chain != null || link != null)
{
/*
* Strategy 1:
* Connect chains or links if they are the only things left...
*/
bool connectchains = (link == null);
bool connectlinks = (chain == null);
if (!connectchains && !connectlinks)
{
// assert(link != null && chain != null);
/*
* Strategy 2:
* Connect chains or links if they close off an open area...
*/
if (nextchain != null)
connectchains = ((curchain & 1) == 0 &&
chain.GetX() == nextchain.GetX());
if (nextlink != null)
{
connectlinks = ((curlink & 1) == 0 &&
link.GetX() == nextlink.GetX());
if (!connectchains && !connectlinks)
{
/*
* Strategy 3:
* Connect chains or links if their successor is
* between them and their potential connectee...
*/
double cx = chain.GetX();
double lx = link.GetX();
connectchains =
(nextchain != null && cx < lx &&
Obstructs(nextchain.GetX(), lx, curchain));
connectlinks =
(lx < cx &&
Obstructs(nextlink.GetX(), cx, curlink));
}
}
}
if (connectchains)
{
CurveLink subcurve = chain.LinkTo(nextchain);
if (subcurve != null)
{
subcurves.Add(subcurve);
}
curchain += 2;
chain = endlist[curchain];
nextchain = endlist[curchain + 1];
}
if (connectlinks)
{
ChainEnd openend = new ChainEnd(link, null);
ChainEnd closeend = new ChainEnd(nextlink, openend);
openend.SetOtherEnd(closeend);
chains.Add(openend);
chains.Add(closeend);
curlink += 2;
link = linklist[curlink];
nextlink = linklist[curlink + 1];
}
if (!connectchains && !connectlinks)
{
// assert(link != null);
// assert(chain != null);
// assert(chain.getEtag() == link.getEtag());
chain.AddLink(link);
chains.Add(chain);
curchain++;
chain = nextchain;
nextchain = endlist[curchain + 1];
curlink++;
link = nextlink;
nextlink = linklist[curlink + 1];
}
}
}
