//------------------------------------------------------------------------------
internal static bool SlopesEqual(TEdge e1, TEdge e2, bool UseFullRange)
{
if (UseFullRange)
{
return(Int128.Int128Mul(e1.Delta.Y, e2.Delta.X) ==
Int128.Int128Mul(e1.Delta.X, e2.Delta.Y));
}
else
{
return((Int64)(e1.Delta.Y) * (e2.Delta.X) ==
(Int64)(e1.Delta.X) * (e2.Delta.Y));
}
}
//------------------------------------------------------------------------------
private void ReverseHorizontal(TEdge e)
{
//swap horizontal edges' top and bottom x's so they follow the natural
//progression of the bounds - ie so their xbots will align with the
//adjoining lower edge. [Helpful in the ProcessHorizontal() method.]
Int64 tmp = e.Top.X;
e.Top.X = e.Bot.X;
e.Bot.X = tmp;
#if use_xyz
tmp = e.Top.Z;
e.Top.Z = e.Bot.Z;
e.Bot.Z = tmp;
#endif
}
private void InitEdge2(TEdge e, PolyType polyType)
{
if (e.Curr.Y >= e.Next.Curr.Y)
{
e.Bot = e.Curr;
e.Top = e.Next.Curr;
}
else
{
e.Top = e.Curr;
e.Bot = e.Next.Curr;
}
SetDx(e);
e.PolyTyp = polyType;
}
//----------------------------------------------------------------------
void AscendToMax(ref TEdge E, bool Appending, bool IsClosed)
{
if (E.OutIdx == Skip)
{
E = E.Next;
if (!MoreAbove(E.Prev))
{
return;
}
}
if (IsHorizontal(E) && Appending &&
(E.Bot != E.Prev.Bot))
{
ReverseHorizontal(E);
}
//now process the ascending bound ....
TEdge EStart = E;
for (;;)
{
if (E.Next.OutIdx == Skip ||
((E.Next.Top.Y == E.Top.Y) && !IsHorizontal(E.Next)))
{
break;
}
E.NextInLML = E.Next;
E = E.Next;
if (IsHorizontal(E) && (E.Bot.X != E.Prev.Top.X))
{
ReverseHorizontal(E);
}
}
if (!Appending)
{
if (EStart.OutIdx == Skip)
{
EStart = EStart.Next;
}
if (EStart != E.Next)
{
DoMinimaLML(null, EStart, IsClosed);
}
}
E = E.Next;
}
//------------------------------------------------------------------------------
bool MoreAbove(TEdge Edge)
{
if (IsHorizontal(Edge))
{
Edge = GetLastHorz(Edge);
return(Edge.Next.Top.Y < Edge.Top.Y);
}
else if (IsHorizontal(Edge.Next))
{
Edge = GetLastHorz(Edge.Next);
return(Edge.Next.Top.Y < Edge.Top.Y);
}
else
{
return(Edge.Next.Top.Y < Edge.Top.Y);
}
}
/// <summary>
/// Reset all fields to default values in preparation for object recycling
/// </summary>
public void PrepareForRecycle()
{
PolyTyp = PolyType.Subject;
Side = EdgeSide.Left;
Bot = Curr = Top = Delta = new IntPoint();
Dx = 0;
WindDelta = 0;
WindCnt = 0;
WindCnt2 = 0;
OutIdx = 0;
Next = Prev = null;
PrevInAEL = PrevInSEL = null;
NextInLML = NextInAEL = NextInSEL = null;
}
//------------------------------------------------------------------------------
bool JustBeforeLocMin(TEdge Edge)
{
//Edge is Skip and was heading down.
TEdge E = Edge;
if (IsHorizontal(E))
{
while (IsHorizontal(E.Next))
{
E = E.Next;
}
return(E.Next.Top.Y < E.Bot.Y);
}
else
{
return(SharedVertWithNextIsBot(E));
}
}
//constructor
public Clipper(int InitOptions = 0)
: base()
{
m_Scanbeam = null;
m_Maxima = null;
m_ActiveEdges = null;
m_SortedEdges = null;
m_IntersectList = new List<IntersectNode>();
m_IntersectNodeComparer = new MyIntersectNodeSort();
m_ExecuteLocked = false;
m_UsingPolyTree = false;
m_PolyOuts = new List<OutRec>();
m_Joins = new List<Join>();
m_GhostJoins = new List<Join>();
ReverseSolution = (ioReverseSolution & InitOptions) != 0;
StrictlySimple = (ioStrictlySimple & InitOptions) != 0;
PreserveCollinear = (ioPreserveCollinear & InitOptions) != 0;
#if use_xyz
ZFillFunction = null;
#endif
}
//------------------------------------------------------------------------------
bool AllHorizontal(TEdge Edge)
{
if (!IsHorizontal(Edge))
{
return(false);
}
TEdge E = Edge.Next;
while (E != Edge)
{
if (!IsHorizontal(E))
{
return(false);
}
else
{
E = E.Next;
}
}
return(true);
}
internal void DeleteFromAEL(TEdge e)
{
TEdge prevInAEL = e.PrevInAEL;
TEdge nextInAEL = e.NextInAEL;
if (prevInAEL != null || nextInAEL != null || e == m_ActiveEdges)
{
if (prevInAEL != null)
{
prevInAEL.NextInAEL = nextInAEL;
}
else
{
m_ActiveEdges = nextInAEL;
}
if (nextInAEL != null)
{
nextInAEL.PrevInAEL = prevInAEL;
}
e.NextInAEL = null;
e.PrevInAEL = null;
}
}
internal void UpdateEdgeIntoAEL(ref TEdge e)
{
if (e.NextInLML == null)
{
throw new ClipperException("UpdateEdgeIntoAEL: invalid call");
}
TEdge prevInAEL = e.PrevInAEL;
TEdge nextInAEL = e.NextInAEL;
e.NextInLML.OutIdx = e.OutIdx;
if (prevInAEL != null)
{
prevInAEL.NextInAEL = e.NextInLML;
}
else
{
m_ActiveEdges = e.NextInLML;
}
if (nextInAEL != null)
{
nextInAEL.PrevInAEL = e.NextInLML;
}
e.NextInLML.Side = e.Side;
e.NextInLML.WindDelta = e.WindDelta;
e.NextInLML.WindCnt = e.WindCnt;
e.NextInLML.WindCnt2 = e.WindCnt2;
e = e.NextInLML;
TEdge obj = e;
obj.Curr = obj.Bot;
e.PrevInAEL = prevInAEL;
e.NextInAEL = nextInAEL;
if (!IsHorizontal(e))
{
InsertScanbeam(e.Top.Y);
}
}
protected virtual void Reset()
{
m_CurrentLM = m_MinimaList;
if (m_CurrentLM != null)
{
for (LocalMinima localMinima = m_MinimaList; localMinima != null; localMinima = localMinima.Next)
{
TEdge leftBound = localMinima.LeftBound;
if (leftBound != null)
{
leftBound.Curr = leftBound.Bot;
leftBound.Side = EdgeSide.esLeft;
leftBound.OutIdx = -1;
}
leftBound = localMinima.RightBound;
if (leftBound != null)
{
leftBound.Curr = leftBound.Bot;
leftBound.Side = EdgeSide.esRight;
leftBound.OutIdx = -1;
}
}
}
}
//------------------------------------------------------------------------------
internal void DeleteFromAEL(TEdge e)
{
TEdge AelPrev = e.PrevInAEL;
TEdge AelNext = e.NextInAEL;
if (AelPrev == null && AelNext == null && (e != m_ActiveEdges))
{
return; //already deleted
}
if (AelPrev != null)
{
AelPrev.NextInAEL = AelNext;
}
else
{
m_ActiveEdges = AelNext;
}
if (AelNext != null)
{
AelNext.PrevInAEL = AelPrev;
}
e.NextInAEL = null;
e.PrevInAEL = null;
}
//------------------------------------------------------------------------------
protected override void Reset()
{
base.Reset();
m_Scanbeam = null;
m_ActiveEdges = null;
m_SortedEdges = null;
DisposeAllPolyPts();
LocalMinima lm = m_MinimaList;
while (lm != null)
{
InsertScanbeam(lm.Y);
InsertScanbeam(lm.leftBound.ytop);
lm = lm.next;
}
}
//------------------------------------------------------------------------------
private void SetDx(TEdge e)
{
if (e.ybot == e.ytop) e.dx = horizontal;
else e.dx = (double)(e.xtop - e.xbot)/(e.ytop - e.ybot);
}
//---------------------------------------------------------------------------
TEdge AddBoundsToLML(TEdge e)
{
//Starting at the top of one bound we progress to the bottom where there's
//a local minima. We then go to the top of the next bound. These two bounds
//form the left and right (or right and left) bounds of the local minima.
e.nextInLML = null;
e = e.next;
for (;;)
{
if ( e.dx == horizontal )
{
//nb: proceed through horizontals when approaching from their right,
// but break on horizontal minima if approaching from their left.
// This ensures 'local minima' are always on the left of horizontals.
if (e.next.ytop < e.ytop && e.next.xbot > e.prev.xbot) break;
if (e.xtop != e.prev.xbot) SwapX(e);
e.nextInLML = e.prev;
}
else if (e.ycurr == e.prev.ycurr) break;
else e.nextInLML = e.prev;
e = e.next;
}
//e and e.prev are now at a local minima ...
LocalMinima newLm = new LocalMinima();
newLm.next = null;
newLm.Y = e.prev.ybot;
if ( e.dx == horizontal ) //horizontal edges never start a left bound
{
if (e.xbot != e.prev.xbot) SwapX(e);
newLm.leftBound = e.prev;
newLm.rightBound = e;
} else if (e.dx < e.prev.dx)
{
newLm.leftBound = e.prev;
newLm.rightBound = e;
} else
{
newLm.leftBound = e;
newLm.rightBound = e.prev;
}
newLm.leftBound.side = EdgeSide.esLeft;
newLm.rightBound.side = EdgeSide.esRight;
InsertLocalMinima( newLm );
for (;;)
{
if ( e.next.ytop == e.ytop && e.next.dx != horizontal ) break;
e.nextInLML = e.next;
e = e.next;
if ( e.dx == horizontal && e.xbot != e.prev.xtop) SwapX(e);
}
return e.next;
}
//------------------------------------------------------------------------------
private void UpdateEdgeIntoAEL(ref TEdge e)
{
if (e.nextInLML == null)
throw new ClipperException("UpdateEdgeIntoAEL: invalid call");
TEdge AelPrev = e.prevInAEL;
TEdge AelNext = e.nextInAEL;
e.nextInLML.outIdx = e.outIdx;
if (AelPrev != null)
AelPrev.nextInAEL = e.nextInLML;
else m_ActiveEdges = e.nextInLML;
if (AelNext != null)
AelNext.prevInAEL = e.nextInLML;
e.nextInLML.side = e.side;
e.nextInLML.windDelta = e.windDelta;
e.nextInLML.windCnt = e.windCnt;
e.nextInLML.windCnt2 = e.windCnt2;
e = e.nextInLML;
e.prevInAEL = AelPrev;
e.nextInAEL = AelNext;
if (e.dx != horizontal) InsertScanbeam(e.ytop);
}
//------------------------------------------------------------------------------
public IntRect GetBounds()
{
IntRect result = new IntRect();
LocalMinima lm = m_MinimaList;
if (lm == null)
{
return(result);
}
result.left = lm.LeftBound.Bot.X;
result.top = lm.LeftBound.Bot.Y;
result.right = lm.LeftBound.Bot.X;
result.bottom = lm.LeftBound.Bot.Y;
while (lm != null)
{
if (lm.LeftBound.Bot.Y > result.bottom)
{
result.bottom = lm.LeftBound.Bot.Y;
}
TEdge e = lm.LeftBound;
for (; ;)
{
TEdge bottomE = e;
while (e.NextInLML != null)
{
if (e.Bot.X < result.left)
{
result.left = e.Bot.X;
}
if (e.Bot.X > result.right)
{
result.right = e.Bot.X;
}
e = e.NextInLML;
}
if (e.Bot.X < result.left)
{
result.left = e.Bot.X;
}
if (e.Bot.X > result.right)
{
result.right = e.Bot.X;
}
if (e.Top.X < result.left)
{
result.left = e.Top.X;
}
if (e.Top.X > result.right)
{
result.right = e.Top.X;
}
if (e.Top.Y < result.top)
{
result.top = e.Top.Y;
}
if (bottomE == lm.LeftBound)
{
e = lm.RightBound;
}
else
{
break;
}
}
lm = lm.Next;
}
return(result);
}
//------------------------------------------------------------------------------
private void AddOutPt(TEdge e, TEdge altE, IntPoint pt)
{
bool ToFront = (e.side == EdgeSide.esLeft);
if( e.outIdx < 0 )
{
OutRec outRec = CreateOutRec();
m_PolyOuts.Add(outRec);
outRec.idx = m_PolyOuts.Count -1;
e.outIdx = outRec.idx;
OutPt op = new OutPt();
outRec.pts = op;
outRec.bottomPt = op;
outRec.bottomE1 = e;
outRec.bottomE2 = altE;
op.pt = pt;
op.idx = outRec.idx;
op.next = op;
op.prev = op;
SetHoleState(e, outRec);
} else
{
OutRec outRec = m_PolyOuts[e.outIdx];
OutPt op = outRec.pts;
if (ToFront && PointsEqual(pt, op.pt) ||
(!ToFront && PointsEqual(pt, op.prev.pt))) return;
OutPt op2 = new OutPt();
op2.pt = pt;
op2.idx = outRec.idx;
if (op2.pt.Y == outRec.bottomPt.pt.Y &&
op2.pt.X < outRec.bottomPt.pt.X)
{
outRec.bottomPt = op2;
outRec.bottomE1 = e;
outRec.bottomE2 = altE;
}
op2.next = op;
op2.prev = op.prev;
op2.prev.next = op2;
op.prev = op2;
if (ToFront) outRec.pts = op2;
}
}
//------------------------------------------------------------------------------
private void AddIntersectNode(TEdge e1, TEdge e2, IntPoint pt)
{
IntersectNode newNode = new IntersectNode();
newNode.edge1 = e1;
newNode.edge2 = e2;
newNode.pt = pt;
newNode.next = null;
if (m_IntersectNodes == null) m_IntersectNodes = newNode;
else if( Process1Before2(newNode, m_IntersectNodes) )
{
newNode.next = m_IntersectNodes;
m_IntersectNodes = newNode;
}
else
{
IntersectNode iNode = m_IntersectNodes;
while( iNode.next != null && Process1Before2(iNode.next, newNode) )
iNode = iNode.next;
newNode.next = iNode.next;
iNode.next = newNode;
}
}
//------------------------------------------------------------------------------
internal void SwapPositionsInAEL(TEdge edge1, TEdge edge2)
{
//check that one or other edge hasn't already been removed from AEL ...
if (edge1.NextInAEL == edge1.PrevInAEL ||
edge2.NextInAEL == edge2.PrevInAEL)
{
return;
}
if (edge1.NextInAEL == edge2)
{
TEdge next = edge2.NextInAEL;
if (next != null)
{
next.PrevInAEL = edge1;
}
TEdge prev = edge1.PrevInAEL;
if (prev != null)
{
prev.NextInAEL = edge2;
}
edge2.PrevInAEL = prev;
edge2.NextInAEL = edge1;
edge1.PrevInAEL = edge2;
edge1.NextInAEL = next;
}
else if (edge2.NextInAEL == edge1)
{
TEdge next = edge1.NextInAEL;
if (next != null)
{
next.PrevInAEL = edge2;
}
TEdge prev = edge2.PrevInAEL;
if (prev != null)
{
prev.NextInAEL = edge1;
}
edge1.PrevInAEL = prev;
edge1.NextInAEL = edge2;
edge2.PrevInAEL = edge1;
edge2.NextInAEL = next;
}
else
{
TEdge next = edge1.NextInAEL;
TEdge prev = edge1.PrevInAEL;
edge1.NextInAEL = edge2.NextInAEL;
if (edge1.NextInAEL != null)
{
edge1.NextInAEL.PrevInAEL = edge1;
}
edge1.PrevInAEL = edge2.PrevInAEL;
if (edge1.PrevInAEL != null)
{
edge1.PrevInAEL.NextInAEL = edge1;
}
edge2.NextInAEL = next;
if (edge2.NextInAEL != null)
{
edge2.NextInAEL.PrevInAEL = edge2;
}
edge2.PrevInAEL = prev;
if (edge2.PrevInAEL != null)
{
edge2.PrevInAEL.NextInAEL = edge2;
}
}
if (edge1.PrevInAEL == null)
{
m_ActiveEdges = edge1;
}
else if (edge2.PrevInAEL == null)
{
m_ActiveEdges = edge2;
}
}
//----------------------------------------------------------------------
TEdge DescendToMin(ref TEdge E)
{
//PRECONDITION: STARTING EDGE IS A VALID DESCENDING EDGE.
//Starting at the top of one bound we progress to the bottom where there's
//A local minima. We go to the top of the Next bound. These two bounds
//form the left and right (or right and left) bounds of the local minima.
TEdge EHorz;
E.NextInLML = null;
if (IsHorizontal(E))
{
EHorz = E;
while (IsHorizontal(EHorz.Next))
{
EHorz = EHorz.Next;
}
if (EHorz.Bot != EHorz.Next.Top)
{
ReverseHorizontal(E);
}
}
for (; ;)
{
E = E.Next;
if (E.OutIdx == Skip)
{
break;
}
else if (IsHorizontal(E))
{
//nb: proceed through horizontals when approaching from their right,
// but break on horizontal minima if approaching from their left.
// This ensures 'local minima' are always on the left of horizontals.
//look ahead is required in case of multiple consec. horizontals
EHorz = GetLastHorz(E);
if (EHorz == E.Prev || //horizontal line
(EHorz.Next.Top.Y < E.Top.Y && //bottom horizontal
EHorz.Next.Bot.X > E.Prev.Bot.X)) //approaching from the left
{
break;
}
if (E.Top.X != E.Prev.Bot.X)
{
ReverseHorizontal(E);
}
if (EHorz.OutIdx == Skip)
{
EHorz = EHorz.Prev;
}
while (E != EHorz)
{
E.NextInLML = E.Prev;
E = E.Next;
if (E.Top.X != E.Prev.Bot.X)
{
ReverseHorizontal(E);
}
}
}
else if (E.Bot.Y == E.Prev.Bot.Y)
{
break;
}
E.NextInLML = E.Prev;
}
return(E.Prev);
}
//----------------------------------------------------------------------
TEdge AddBoundsToLML(TEdge E, bool Closed)
{
//Starting at the top of one bound we progress to the bottom where there's
//A local minima. We then go to the top of the Next bound. These two bounds
//form the left and right (or right and left) bounds of the local minima.
TEdge B;
bool AppendMaxima;
//do minima ...
if (E.OutIdx == Skip)
{
if (MoreBelow(E))
{
E = E.Next;
B = DescendToMin(ref E);
}
else
{
B = null;
}
}
else
{
B = DescendToMin(ref E);
}
if (E.OutIdx == Skip) //nb: may be BEFORE, AT or just THRU LM
{
//do minima before Skip...
DoMinimaLML(null, B, Closed); //store what we've got so far (if anything)
AppendMaxima = false;
//finish off any minima ...
if (E.Bot != E.Prev.Bot && MoreBelow(E))
{
E = E.Next;
B = DescendToMin(ref E);
DoMinimaLML(B, E, Closed);
AppendMaxima = true;
}
else if (JustBeforeLocMin(E))
{
E = E.Next;
}
}
else
{
DoMinimaLML(B, E, Closed);
AppendMaxima = true;
}
//now do maxima ...
AscendToMax(ref E, AppendMaxima, Closed);
if (E.OutIdx == Skip && (E.Top != E.Prev.Top)) //may be BEFORE, AT or just AFTER maxima
{
//finish off any maxima ...
if (MoreAbove(E))
{
E = E.Next;
AscendToMax(ref E, false, Closed);
}
else if (E.Top == E.Next.Top || (IsHorizontal(E.Next) && (E.Top == E.Next.Bot)))
{
E = E.Next; //ie just before Maxima
}
}
return(E);
}
//---------------------------------------------------------------------------
void DoMinimaLML(TEdge E1, TEdge E2, bool IsClosed)
{
if (E1 == null)
{
if (E2 == null)
{
return;
}
LocalMinima NewLm = new LocalMinima();
NewLm.Next = null;
NewLm.Y = E2.Bot.Y;
NewLm.LeftBound = null;
E2.WindDelta = 0;
NewLm.RightBound = E2;
InsertLocalMinima(NewLm);
}
else
{
//E and E.Prev are now at a local minima ...
LocalMinima NewLm = new LocalMinima();
NewLm.Y = E1.Bot.Y;
NewLm.Next = null;
if (IsHorizontal(E2)) //Horz. edges never start a Left bound
{
if (E2.Bot.X != E1.Bot.X)
{
ReverseHorizontal(E2);
}
NewLm.LeftBound = E1;
NewLm.RightBound = E2;
}
else if (E2.Dx < E1.Dx)
{
NewLm.LeftBound = E1;
NewLm.RightBound = E2;
}
else
{
NewLm.LeftBound = E2;
NewLm.RightBound = E1;
}
NewLm.LeftBound.Side = EdgeSide.esLeft;
NewLm.RightBound.Side = EdgeSide.esRight;
//set the winding state of the first edge in each bound
//(it'll be copied to subsequent edges in the bound) ...
if (!IsClosed)
{
NewLm.LeftBound.WindDelta = 0;
}
else if (NewLm.LeftBound.Next == NewLm.RightBound)
{
NewLm.LeftBound.WindDelta = -1;
}
else
{
NewLm.LeftBound.WindDelta = 1;
}
NewLm.RightBound.WindDelta = -NewLm.LeftBound.WindDelta;
InsertLocalMinima(NewLm);
}
}
private TEdge ProcessBound(TEdge E, bool IsClockwise)
{
TEdge tEdge = E;
TEdge tEdge2 = E;
if (E.Dx == -3.4E+38)
{
long num = (!IsClockwise) ? E.Next.Bot.X : E.Prev.Bot.X;
if (E.Bot.X != num)
{
ReverseHorizontal(E);
}
}
if (tEdge2.OutIdx != -2)
{
if (IsClockwise)
{
while (tEdge2.Top.Y == tEdge2.Next.Bot.Y && tEdge2.Next.OutIdx != -2)
{
tEdge2 = tEdge2.Next;
}
if (tEdge2.Dx == -3.4E+38 && tEdge2.Next.OutIdx != -2)
{
TEdge tEdge3 = tEdge2;
while (tEdge3.Prev.Dx == -3.4E+38)
{
tEdge3 = tEdge3.Prev;
}
if (tEdge3.Prev.Top.X == tEdge2.Next.Top.X)
{
if (!IsClockwise)
{
tEdge2 = tEdge3.Prev;
}
}
else if (tEdge3.Prev.Top.X > tEdge2.Next.Top.X)
{
tEdge2 = tEdge3.Prev;
}
}
while (E != tEdge2)
{
E.NextInLML = E.Next;
if (E.Dx == -3.4E+38 && E != tEdge && E.Bot.X != E.Prev.Top.X)
{
ReverseHorizontal(E);
}
E = E.Next;
}
if (E.Dx == -3.4E+38 && E != tEdge && E.Bot.X != E.Prev.Top.X)
{
ReverseHorizontal(E);
}
tEdge2 = tEdge2.Next;
}
else
{
while (tEdge2.Top.Y == tEdge2.Prev.Bot.Y && tEdge2.Prev.OutIdx != -2)
{
tEdge2 = tEdge2.Prev;
}
if (tEdge2.Dx == -3.4E+38 && tEdge2.Prev.OutIdx != -2)
{
TEdge tEdge3 = tEdge2;
while (tEdge3.Next.Dx == -3.4E+38)
{
tEdge3 = tEdge3.Next;
}
if (tEdge3.Next.Top.X == tEdge2.Prev.Top.X)
{
if (!IsClockwise)
{
tEdge2 = tEdge3.Next;
}
}
else if (tEdge3.Next.Top.X > tEdge2.Prev.Top.X)
{
tEdge2 = tEdge3.Next;
}
}
while (E != tEdge2)
{
E.NextInLML = E.Prev;
if (E.Dx == -3.4E+38 && E != tEdge && E.Bot.X != E.Next.Top.X)
{
ReverseHorizontal(E);
}
E = E.Prev;
}
if (E.Dx == -3.4E+38 && E != tEdge && E.Bot.X != E.Next.Top.X)
{
ReverseHorizontal(E);
}
tEdge2 = tEdge2.Prev;
}
}
if (tEdge2.OutIdx == -2)
{
E = tEdge2;
if (IsClockwise)
{
while (E.Top.Y == E.Next.Bot.Y)
{
E = E.Next;
}
while (E != tEdge2 && E.Dx == -3.4E+38)
{
E = E.Prev;
}
}
else
{
while (E.Top.Y == E.Prev.Bot.Y)
{
E = E.Prev;
}
while (E != tEdge2 && E.Dx == -3.4E+38)
{
E = E.Next;
}
}
if (E == tEdge2)
{
tEdge2 = ((!IsClockwise) ? E.Prev : E.Next);
}
else
{
E = ((!IsClockwise) ? tEdge2.Prev : tEdge2.Next);
LocalMinima localMinima = new LocalMinima();
localMinima.Next = null;
localMinima.Y = E.Bot.Y;
localMinima.LeftBound = null;
localMinima.RightBound = E;
localMinima.RightBound.WindDelta = 0;
tEdge2 = ProcessBound(localMinima.RightBound, IsClockwise);
InsertLocalMinima(localMinima);
}
}
return(tEdge2);
}
internal void SwapPositionsInAEL(TEdge edge1, TEdge edge2)
{
if (edge1.NextInAEL != edge1.PrevInAEL && edge2.NextInAEL != edge2.PrevInAEL)
{
if (edge1.NextInAEL == edge2)
{
TEdge nextInAEL = edge2.NextInAEL;
if (nextInAEL != null)
{
nextInAEL.PrevInAEL = edge1;
}
TEdge prevInAEL = edge1.PrevInAEL;
if (prevInAEL != null)
{
prevInAEL.NextInAEL = edge2;
}
edge2.PrevInAEL = prevInAEL;
edge2.NextInAEL = edge1;
edge1.PrevInAEL = edge2;
edge1.NextInAEL = nextInAEL;
}
else if (edge2.NextInAEL == edge1)
{
TEdge nextInAEL2 = edge1.NextInAEL;
if (nextInAEL2 != null)
{
nextInAEL2.PrevInAEL = edge2;
}
TEdge prevInAEL2 = edge2.PrevInAEL;
if (prevInAEL2 != null)
{
prevInAEL2.NextInAEL = edge1;
}
edge1.PrevInAEL = prevInAEL2;
edge1.NextInAEL = edge2;
edge2.PrevInAEL = edge1;
edge2.NextInAEL = nextInAEL2;
}
else
{
TEdge nextInAEL3 = edge1.NextInAEL;
TEdge prevInAEL3 = edge1.PrevInAEL;
edge1.NextInAEL = edge2.NextInAEL;
if (edge1.NextInAEL != null)
{
edge1.NextInAEL.PrevInAEL = edge1;
}
edge1.PrevInAEL = edge2.PrevInAEL;
if (edge1.PrevInAEL != null)
{
edge1.PrevInAEL.NextInAEL = edge1;
}
edge2.NextInAEL = nextInAEL3;
if (edge2.NextInAEL != null)
{
edge2.NextInAEL.PrevInAEL = edge2;
}
edge2.PrevInAEL = prevInAEL3;
if (edge2.PrevInAEL != null)
{
edge2.PrevInAEL.NextInAEL = edge2;
}
}
if (edge1.PrevInAEL == null)
{
m_ActiveEdges = edge1;
}
else if (edge2.PrevInAEL == null)
{
m_ActiveEdges = edge2;
}
}
}
//------------------------------------------------------------------------------
private static void SwapSides(TEdge edge1, TEdge edge2)
{
EdgeSide side = edge1.side;
edge1.side = edge2.side;
edge2.side = side;
}
//------------------------------------------------------------------------------
private TEdge ProcessBound(TEdge E, bool LeftBoundIsForward)
{
TEdge EStart, Result = E;
TEdge Horz;
if (Result.OutIdx == Skip)
{
//check if there are edges beyond the skip edge in the bound and if so
//create another LocMin and calling ProcessBound once more ...
E = Result;
if (LeftBoundIsForward)
{
while (E.Top.Y == E.Next.Bot.Y)
{
E = E.Next;
}
while (E != Result && E.Dx == horizontal)
{
E = E.Prev;
}
}
else
{
while (E.Top.Y == E.Prev.Bot.Y)
{
E = E.Prev;
}
while (E != Result && E.Dx == horizontal)
{
E = E.Next;
}
}
if (E == Result)
{
if (LeftBoundIsForward)
{
Result = E.Next;
}
else
{
Result = E.Prev;
}
}
else
{
//there are more edges in the bound beyond result starting with E
if (LeftBoundIsForward)
{
E = Result.Next;
}
else
{
E = Result.Prev;
}
LocalMinima locMin = new LocalMinima();
locMin.Next = null;
locMin.Y = E.Bot.Y;
locMin.LeftBound = null;
locMin.RightBound = E;
E.WindDelta = 0;
Result = ProcessBound(E, LeftBoundIsForward);
InsertLocalMinima(locMin);
}
return(Result);
}
if (E.Dx == horizontal)
{
//We need to be careful with open paths because this may not be a
//true local minima (ie E may be following a skip edge).
//Also, consecutive horz. edges may start heading left before going right.
if (LeftBoundIsForward)
{
EStart = E.Prev;
}
else
{
EStart = E.Next;
}
if (EStart.Dx == horizontal) //ie an adjoining horizontal skip edge
{
if (EStart.Bot.X != E.Bot.X && EStart.Top.X != E.Bot.X)
{
ReverseHorizontal(E);
}
}
else if (EStart.Bot.X != E.Bot.X)
{
ReverseHorizontal(E);
}
}
EStart = E;
if (LeftBoundIsForward)
{
while (Result.Top.Y == Result.Next.Bot.Y && Result.Next.OutIdx != Skip)
{
Result = Result.Next;
}
if (Result.Dx == horizontal && Result.Next.OutIdx != Skip)
{
//nb: at the top of a bound, horizontals are added to the bound
//only when the preceding edge attaches to the horizontal's left vertex
//unless a Skip edge is encountered when that becomes the top divide
Horz = Result;
while (Horz.Prev.Dx == horizontal)
{
Horz = Horz.Prev;
}
if (Horz.Prev.Top.X > Result.Next.Top.X)
{
Result = Horz.Prev;
}
}
while (E != Result)
{
E.NextInLML = E.Next;
if (E.Dx == horizontal && E != EStart && E.Bot.X != E.Prev.Top.X)
{
ReverseHorizontal(E);
}
E = E.Next;
}
if (E.Dx == horizontal && E != EStart && E.Bot.X != E.Prev.Top.X)
{
ReverseHorizontal(E);
}
Result = Result.Next; //move to the edge just beyond current bound
}
else
{
while (Result.Top.Y == Result.Prev.Bot.Y && Result.Prev.OutIdx != Skip)
{
Result = Result.Prev;
}
if (Result.Dx == horizontal && Result.Prev.OutIdx != Skip)
{
Horz = Result;
while (Horz.Next.Dx == horizontal)
{
Horz = Horz.Next;
}
if (Horz.Next.Top.X == Result.Prev.Top.X ||
Horz.Next.Top.X > Result.Prev.Top.X)
{
Result = Horz.Next;
}
}
while (E != Result)
{
E.NextInLML = E.Prev;
if (E.Dx == horizontal && E != EStart && E.Bot.X != E.Next.Top.X)
{
ReverseHorizontal(E);
}
E = E.Prev;
}
if (E.Dx == horizontal && E != EStart && E.Bot.X != E.Next.Top.X)
{
ReverseHorizontal(E);
}
Result = Result.Prev; //move to the edge just beyond current bound
}
return(Result);
}
//------------------------------------------------------------------------------
private void AddEdgeToSEL(TEdge edge)
{
//SEL pointers in PEdge are reused to build a list of horizontal edges.
//However, we don't need to worry about order with horizontal edge processing.
if (m_SortedEdges == null)
{
m_SortedEdges = edge;
edge.prevInSEL = null;
edge.nextInSEL = null;
}
else
{
edge.nextInSEL = m_SortedEdges;
edge.prevInSEL = null;
m_SortedEdges.prevInSEL = edge;
m_SortedEdges = edge;
}
}
//------------------------------------------------------------------------------
public bool AddPath(List <IntPoint> pg, PolyType polyType, bool Closed)
{
#if use_lines
if (!Closed && polyType == PolyType.ptClip)
{
throw new ClipperException("AddPath: Open paths must be subject.");
}
#else
if (!Closed)
{
throw new ClipperException("AddPath: Open paths have been disabled.");
}
#endif
int highI = (int)pg.Count - 1;
if (Closed)
{
while (highI > 0 && (pg[highI] == pg[0]))
{
--highI;
}
}
while (highI > 0 && (pg[highI] == pg[highI - 1]))
{
--highI;
}
if ((Closed && highI < 2) || (!Closed && highI < 1))
{
return(false);
}
//create a new edge array ...
List <TEdge> edges = new List <TEdge>(highI + 1);
for (int i = 0; i <= highI; i++)
{
edges.Add(new TEdge());
}
bool IsFlat = true;
//1. Basic (first) edge initialization ...
edges[1].Curr = pg[1];
RangeTest(pg[0], ref m_UseFullRange);
RangeTest(pg[highI], ref m_UseFullRange);
InitEdge(edges[0], edges[1], edges[highI], pg[0]);
InitEdge(edges[highI], edges[0], edges[highI - 1], pg[highI]);
for (int i = highI - 1; i >= 1; --i)
{
RangeTest(pg[i], ref m_UseFullRange);
InitEdge(edges[i], edges[i + 1], edges[i - 1], pg[i]);
}
TEdge eStart = edges[0];
//2. Remove duplicate vertices, and (when closed) collinear edges ...
TEdge E = eStart, eLoopStop = eStart;
for (;;)
{
//nb: allows matching start and end points when not Closed ...
if (E.Curr == E.Next.Curr && (Closed || E.Next != eStart))
{
if (E == E.Next)
{
break;
}
if (E == eStart)
{
eStart = E.Next;
}
E = RemoveEdge(E);
eLoopStop = E;
continue;
}
if (E.Prev == E.Next)
{
break; //only two vertices
}
else if (Closed &&
SlopesEqual(E.Prev.Curr, E.Curr, E.Next.Curr, m_UseFullRange) &&
(!PreserveCollinear ||
!Pt2IsBetweenPt1AndPt3(E.Prev.Curr, E.Curr, E.Next.Curr)))
{
//Collinear edges are allowed for open paths but in closed paths
//the default is to merge adjacent collinear edges into a single edge.
//However, if the PreserveCollinear property is enabled, only overlapping
//collinear edges (ie spikes) will be removed from closed paths.
if (E == eStart)
{
eStart = E.Next;
}
E = RemoveEdge(E);
E = E.Prev;
eLoopStop = E;
continue;
}
E = E.Next;
if ((E == eLoopStop) || (!Closed && E.Next == eStart))
{
break;
}
}
if ((!Closed && (E == E.Next)) || (Closed && (E.Prev == E.Next)))
{
return(false);
}
if (!Closed)
{
m_HasOpenPaths = true;
eStart.Prev.OutIdx = Skip;
}
//3. Do second stage of edge initialization ...
E = eStart;
do
{
InitEdge2(E, polyType);
E = E.Next;
if (IsFlat && E.Curr.Y != eStart.Curr.Y)
{
IsFlat = false;
}
}while (E != eStart);
//4. Finally, add edge bounds to LocalMinima list ...
//Totally flat paths must be handled differently when adding them
//to LocalMinima list to avoid endless loops etc ...
if (IsFlat)
{
if (Closed)
{
return(false);
}
E.Prev.OutIdx = Skip;
LocalMinima locMin = new LocalMinima();
locMin.Next = null;
locMin.Y = E.Bot.Y;
locMin.LeftBound = null;
locMin.RightBound = E;
locMin.RightBound.Side = EdgeSide.esRight;
locMin.RightBound.WindDelta = 0;
for (;;)
{
if (E.Bot.X != E.Prev.Top.X)
{
ReverseHorizontal(E);
}
if (E.Next.OutIdx == Skip)
{
break;
}
E.NextInLML = E.Next;
E = E.Next;
}
InsertLocalMinima(locMin);
m_edges.Add(edges);
return(true);
}
m_edges.Add(edges);
bool leftBoundIsForward;
TEdge EMin = null;
//workaround to avoid an endless loop in the while loop below when
//open paths have matching start and end points ...
if (E.Prev.Bot == E.Prev.Top)
{
E = E.Next;
}
for (;;)
{
E = FindNextLocMin(E);
if (E == EMin)
{
break;
}
else if (EMin == null)
{
EMin = E;
}
//E and E.Prev now share a local minima (left aligned if horizontal).
//Compare their slopes to find which starts which bound ...
LocalMinima locMin = new LocalMinima();
locMin.Next = null;
locMin.Y = E.Bot.Y;
if (E.Dx < E.Prev.Dx)
{
locMin.LeftBound = E.Prev;
locMin.RightBound = E;
leftBoundIsForward = false; //Q.nextInLML = Q.prev
}
else
{
locMin.LeftBound = E;
locMin.RightBound = E.Prev;
leftBoundIsForward = true; //Q.nextInLML = Q.next
}
locMin.LeftBound.Side = EdgeSide.esLeft;
locMin.RightBound.Side = EdgeSide.esRight;
if (!Closed)
{
locMin.LeftBound.WindDelta = 0;
}
else if (locMin.LeftBound.Next == locMin.RightBound)
{
locMin.LeftBound.WindDelta = -1;
}
else
{
locMin.LeftBound.WindDelta = 1;
}
locMin.RightBound.WindDelta = -locMin.LeftBound.WindDelta;
E = ProcessBound(locMin.LeftBound, leftBoundIsForward);
if (E.OutIdx == Skip)
{
E = ProcessBound(E, leftBoundIsForward);
}
TEdge E2 = ProcessBound(locMin.RightBound, !leftBoundIsForward);
if (E2.OutIdx == Skip)
{
E2 = ProcessBound(E2, !leftBoundIsForward);
}
if (locMin.LeftBound.OutIdx == Skip)
{
locMin.LeftBound = null;
}
else if (locMin.RightBound.OutIdx == Skip)
{
locMin.RightBound = null;
}
InsertLocalMinima(locMin);
if (!leftBoundIsForward)
{
E = E2;
}
}
return(true);
}
//------------------------------------------------------------------------------
private void AddLocalMaxPoly(TEdge e1, TEdge e2, IntPoint pt)
{
AddOutPt(e1, null, pt);
if (e1.outIdx == e2.outIdx)
{
e1.outIdx = -1;
e2.outIdx = -1;
}
else AppendPolygon(e1, e2);
}
/// <summary>
/// Reset all fields to default values in preparation for object recycling
/// </summary>
public void PrepareForRecycle()
{
Edge1 = null;
Edge2 = null;
Pt = new IntPoint();
}
//------------------------------------------------------------------------------
private void BuildIntersectList(Int64 botY, Int64 topY)
{
if ( m_ActiveEdges == null ) return;
//prepare for sorting ...
TEdge e = m_ActiveEdges;
e.tmpX = TopX( e, topY );
m_SortedEdges = e;
m_SortedEdges.prevInSEL = null;
e = e.nextInAEL;
while( e != null )
{
e.prevInSEL = e.prevInAEL;
e.prevInSEL.nextInSEL = e;
e.nextInSEL = null;
e.tmpX = TopX( e, topY );
e = e.nextInAEL;
}
//bubblesort ...
bool isModified = true;
while( isModified && m_SortedEdges != null )
{
isModified = false;
e = m_SortedEdges;
while( e.nextInSEL != null )
{
TEdge eNext = e.nextInSEL;
IntPoint pt = new IntPoint();
if(e.tmpX > eNext.tmpX && IntersectPoint(e, eNext, ref pt))
{
if (pt.Y > botY)
{
pt.Y = botY;
pt.X = TopX(e, pt.Y);
}
AddIntersectNode(e, eNext, pt);
SwapPositionsInSEL(e, eNext);
isModified = true;
}
else
e = eNext;
}
if( e.prevInSEL != null ) e.prevInSEL.nextInSEL = null;
else break;
}
m_SortedEdges = null;
}
private TEdge ProcessBound(TEdge E, bool LeftBoundIsForward)
{
TEdge tEdge = E;
if (tEdge.OutIdx == -2)
{
E = tEdge;
if (!LeftBoundIsForward)
{
while (E.Top.Y == E.Prev.Bot.Y)
{
E = E.Prev;
}
while (E != tEdge && E.Dx == -3.4E+38)
{
E = E.Next;
}
}
else
{
while (E.Top.Y == E.Next.Bot.Y)
{
E = E.Next;
}
while (E != tEdge && E.Dx == -3.4E+38)
{
E = E.Prev;
}
}
if (E == tEdge)
{
tEdge = ((!LeftBoundIsForward) ? E.Prev : E.Next);
}
else
{
E = ((!LeftBoundIsForward) ? tEdge.Prev : tEdge.Next);
LocalMinima localMinima = new LocalMinima();
localMinima.Next = null;
localMinima.Y = E.Bot.Y;
localMinima.LeftBound = null;
localMinima.RightBound = E;
E.WindDelta = 0;
tEdge = ProcessBound(E, LeftBoundIsForward);
InsertLocalMinima(localMinima);
}
return(tEdge);
}
TEdge tEdge2;
if (E.Dx == -3.4E+38)
{
tEdge2 = ((!LeftBoundIsForward) ? E.Next : E.Prev);
if (tEdge2.OutIdx != -2)
{
if (tEdge2.Dx == -3.4E+38)
{
if (tEdge2.Bot.X != E.Bot.X && tEdge2.Top.X != E.Bot.X)
{
ReverseHorizontal(E);
}
}
else if (tEdge2.Bot.X != E.Bot.X)
{
ReverseHorizontal(E);
}
}
}
tEdge2 = E;
if (!LeftBoundIsForward)
{
while (tEdge.Top.Y == tEdge.Prev.Bot.Y && tEdge.Prev.OutIdx != -2)
{
tEdge = tEdge.Prev;
}
if (tEdge.Dx == -3.4E+38 && tEdge.Prev.OutIdx != -2)
{
TEdge tEdge3 = tEdge;
while (tEdge3.Next.Dx == -3.4E+38)
{
tEdge3 = tEdge3.Next;
}
if (tEdge3.Next.Top.X == tEdge.Prev.Top.X)
{
if (!LeftBoundIsForward)
{
tEdge = tEdge3.Next;
}
}
else if (tEdge3.Next.Top.X > tEdge.Prev.Top.X)
{
tEdge = tEdge3.Next;
}
}
while (E != tEdge)
{
E.NextInLML = E.Prev;
if (E.Dx == -3.4E+38 && E != tEdge2 && E.Bot.X != E.Next.Top.X)
{
ReverseHorizontal(E);
}
E = E.Prev;
}
if (E.Dx == -3.4E+38 && E != tEdge2 && E.Bot.X != E.Next.Top.X)
{
ReverseHorizontal(E);
}
return(tEdge.Prev);
}
while (tEdge.Top.Y == tEdge.Next.Bot.Y && tEdge.Next.OutIdx != -2)
{
tEdge = tEdge.Next;
}
if (tEdge.Dx == -3.4E+38 && tEdge.Next.OutIdx != -2)
{
TEdge tEdge3 = tEdge;
while (tEdge3.Prev.Dx == -3.4E+38)
{
tEdge3 = tEdge3.Prev;
}
if (tEdge3.Prev.Top.X == tEdge.Next.Top.X)
{
if (!LeftBoundIsForward)
{
tEdge = tEdge3.Prev;
}
}
else if (tEdge3.Prev.Top.X > tEdge.Next.Top.X)
{
tEdge = tEdge3.Prev;
}
}
while (E != tEdge)
{
E.NextInLML = E.Next;
if (E.Dx == -3.4E+38 && E != tEdge2 && E.Bot.X != E.Prev.Top.X)
{
ReverseHorizontal(E);
}
E = E.Next;
}
if (E.Dx == -3.4E+38 && E != tEdge2 && E.Bot.X != E.Prev.Top.X)
{
ReverseHorizontal(E);
}
return(tEdge.Next);
}
//------------------------------------------------------------------------------
private void SwapPositionsInSEL(TEdge edge1, TEdge edge2)
{
if (edge1.nextInSEL == null && edge1.prevInSEL == null)
return;
if (edge2.nextInSEL == null && edge2.prevInSEL == null)
return;
if (edge1.nextInSEL == edge2)
{
TEdge next = edge2.nextInSEL;
if (next != null)
next.prevInSEL = edge1;
TEdge prev = edge1.prevInSEL;
if (prev != null)
prev.nextInSEL = edge2;
edge2.prevInSEL = prev;
edge2.nextInSEL = edge1;
edge1.prevInSEL = edge2;
edge1.nextInSEL = next;
}
else if (edge2.nextInSEL == edge1)
{
TEdge next = edge1.nextInSEL;
if (next != null)
next.prevInSEL = edge2;
TEdge prev = edge2.prevInSEL;
if (prev != null)
prev.nextInSEL = edge1;
edge1.prevInSEL = prev;
edge1.nextInSEL = edge2;
edge2.prevInSEL = edge1;
edge2.nextInSEL = next;
}
else
{
TEdge next = edge1.nextInSEL;
TEdge prev = edge1.prevInSEL;
edge1.nextInSEL = edge2.nextInSEL;
if (edge1.nextInSEL != null)
edge1.nextInSEL.prevInSEL = edge1;
edge1.prevInSEL = edge2.prevInSEL;
if (edge1.prevInSEL != null)
edge1.prevInSEL.nextInSEL = edge1;
edge2.nextInSEL = next;
if (edge2.nextInSEL != null)
edge2.nextInSEL.prevInSEL = edge2;
edge2.prevInSEL = prev;
if (edge2.prevInSEL != null)
edge2.prevInSEL.nextInSEL = edge2;
}
if (edge1.prevInSEL == null)
m_SortedEdges = edge1;
else if (edge2.prevInSEL == null)
m_SortedEdges = edge2;
}
public bool AddPath(List <IntPoint> pg, PolyType polyType, bool Closed)
{
if (!Closed)
{
throw new ClipperException("AddPath: Open paths have been disabled.");
}
int num = pg.Count - 1;
if (Closed)
{
while (num > 0 && pg[num] == pg[0])
{
num--;
}
}
while (num > 0 && pg[num] == pg[num - 1])
{
num--;
}
if ((Closed && num < 2) || (!Closed && num < 1))
{
return(false);
}
List <TEdge> list = new List <TEdge>(num + 1);
for (int i = 0; i <= num; i++)
{
list.Add(new TEdge());
}
bool flag = true;
list[1].Curr = pg[1];
RangeTest(pg[0], ref m_UseFullRange);
RangeTest(pg[num], ref m_UseFullRange);
InitEdge(list[0], list[1], list[num], pg[0]);
InitEdge(list[num], list[0], list[num - 1], pg[num]);
for (int num2 = num - 1; num2 >= 1; num2--)
{
RangeTest(pg[num2], ref m_UseFullRange);
InitEdge(list[num2], list[num2 + 1], list[num2 - 1], pg[num2]);
}
TEdge tEdge = list[0];
TEdge tEdge2 = tEdge;
TEdge tEdge3 = tEdge;
while (true)
{
if (tEdge2.Curr == tEdge2.Next.Curr && (Closed || tEdge2.Next != tEdge))
{
if (tEdge2 == tEdge2.Next)
{
break;
}
if (tEdge2 == tEdge)
{
tEdge = tEdge2.Next;
}
tEdge2 = RemoveEdge(tEdge2);
tEdge3 = tEdge2;
}
else
{
if (tEdge2.Prev == tEdge2.Next)
{
break;
}
if (Closed && SlopesEqual(tEdge2.Prev.Curr, tEdge2.Curr, tEdge2.Next.Curr, m_UseFullRange) && (!PreserveCollinear || !Pt2IsBetweenPt1AndPt3(tEdge2.Prev.Curr, tEdge2.Curr, tEdge2.Next.Curr)))
{
if (tEdge2 == tEdge)
{
tEdge = tEdge2.Next;
}
tEdge2 = RemoveEdge(tEdge2);
tEdge2 = tEdge2.Prev;
tEdge3 = tEdge2;
}
else
{
tEdge2 = tEdge2.Next;
if (tEdge2 == tEdge3 || (!Closed && tEdge2.Next == tEdge))
{
break;
}
}
}
}
if ((!Closed && tEdge2 == tEdge2.Next) || (Closed && tEdge2.Prev == tEdge2.Next))
{
return(false);
}
if (!Closed)
{
m_HasOpenPaths = true;
tEdge.Prev.OutIdx = -2;
}
tEdge2 = tEdge;
do
{
InitEdge2(tEdge2, polyType);
tEdge2 = tEdge2.Next;
if (flag && tEdge2.Curr.Y != tEdge.Curr.Y)
{
flag = false;
}
}while (tEdge2 != tEdge);
if (flag)
{
if (Closed)
{
return(false);
}
tEdge2.Prev.OutIdx = -2;
if (tEdge2.Prev.Bot.X < tEdge2.Prev.Top.X)
{
ReverseHorizontal(tEdge2.Prev);
}
LocalMinima localMinima = new LocalMinima();
localMinima.Next = null;
localMinima.Y = tEdge2.Bot.Y;
localMinima.LeftBound = null;
localMinima.RightBound = tEdge2;
localMinima.RightBound.Side = EdgeSide.esRight;
localMinima.RightBound.WindDelta = 0;
while (tEdge2.Next.OutIdx != -2)
{
tEdge2.NextInLML = tEdge2.Next;
if (tEdge2.Bot.X != tEdge2.Prev.Top.X)
{
ReverseHorizontal(tEdge2);
}
tEdge2 = tEdge2.Next;
}
InsertLocalMinima(localMinima);
m_edges.Add(list);
return(true);
}
m_edges.Add(list);
TEdge tEdge4 = null;
if (tEdge2.Prev.Bot == tEdge2.Prev.Top)
{
tEdge2 = tEdge2.Next;
}
while (true)
{
tEdge2 = FindNextLocMin(tEdge2);
if (tEdge2 == tEdge4)
{
break;
}
if (tEdge4 == null)
{
tEdge4 = tEdge2;
}
LocalMinima localMinima2 = new LocalMinima();
localMinima2.Next = null;
localMinima2.Y = tEdge2.Bot.Y;
bool flag2;
if (tEdge2.Dx < tEdge2.Prev.Dx)
{
localMinima2.LeftBound = tEdge2.Prev;
localMinima2.RightBound = tEdge2;
flag2 = false;
}
else
{
localMinima2.LeftBound = tEdge2;
localMinima2.RightBound = tEdge2.Prev;
flag2 = true;
}
localMinima2.LeftBound.Side = EdgeSide.esLeft;
localMinima2.RightBound.Side = EdgeSide.esRight;
if (!Closed)
{
localMinima2.LeftBound.WindDelta = 0;
}
else if (localMinima2.LeftBound.Next == localMinima2.RightBound)
{
localMinima2.LeftBound.WindDelta = -1;
}
else
{
localMinima2.LeftBound.WindDelta = 1;
}
localMinima2.RightBound.WindDelta = -localMinima2.LeftBound.WindDelta;
tEdge2 = ProcessBound(localMinima2.LeftBound, flag2);
if (tEdge2.OutIdx == -2)
{
tEdge2 = ProcessBound(tEdge2, flag2);
}
TEdge tEdge5 = ProcessBound(localMinima2.RightBound, !flag2);
if (tEdge5.OutIdx == -2)
{
tEdge5 = ProcessBound(tEdge5, !flag2);
}
if (localMinima2.LeftBound.OutIdx == -2)
{
localMinima2.LeftBound = null;
}
else if (localMinima2.RightBound.OutIdx == -2)
{
localMinima2.RightBound = null;
}
InsertLocalMinima(localMinima2);
if (!flag2)
{
tEdge2 = tEdge5;
}
}
return(true);
}
//------------------------------------------------------------------------------
internal bool SlopesEqual(TEdge e1, TEdge e2, bool UseFulllongRange)
{
if (e1.ybot == e1.ytop) return (e2.ybot == e2.ytop);
else if (e1.xbot == e1.xtop) return (e2.xbot == e2.xtop);
else if (UseFulllongRange)
return Int128.Int128Mul(e1.ytop - e1.ybot, e2.xtop - e2.xbot) ==
Int128.Int128Mul(e1.xtop - e1.xbot, e2.ytop - e2.ybot);
else return (Int64)(e1.ytop - e1.ybot) * (e2.xtop - e2.xbot) -
(Int64)(e1.xtop - e1.xbot)*(e2.ytop - e2.ybot) == 0;
}
internal static bool IsHorizontal(TEdge e)
{
return(e.Delta.Y == 0);
}
//------------------------------------------------------------------------------
private void InitEdge(TEdge e, TEdge eNext,
TEdge ePrev, IntPoint pt, PolyType polyType)
{
e.next = eNext;
e.prev = ePrev;
e.xcurr = pt.X;
e.ycurr = pt.Y;
if (e.ycurr >= e.next.ycurr)
{
e.xbot = e.xcurr;
e.ybot = e.ycurr;
e.xtop = e.next.xcurr;
e.ytop = e.next.ycurr;
e.windDelta = 1;
} else
{
e.xtop = e.xcurr;
e.ytop = e.ycurr;
e.xbot = e.next.xcurr;
e.ybot = e.next.ycurr;
e.windDelta = -1;
}
SetDx(e);
e.polyType = polyType;
e.outIdx = -1;
}
private void ReverseHorizontal(TEdge e)
{
Swap(ref e.Top.X, ref e.Bot.X);
}
//------------------------------------------------------------------------------
private void SwapX(TEdge e)
{
//swap horizontal edges' top and bottom x's so they follow the natural
//progression of the bounds - ie so their xbots will align with the
//adjoining lower edge. [Helpful in the ProcessHorizontal() method.]
e.xcurr = e.xtop;
e.xtop = e.xbot;
e.xbot = e.xcurr;
}
//------------------------------------------------------------------------------
private void DeleteFromAEL(TEdge e)
{
TEdge AelPrev = e.prevInAEL;
TEdge AelNext = e.nextInAEL;
if (AelPrev == null && AelNext == null && (e != m_ActiveEdges))
return; //already deleted
if (AelPrev != null)
AelPrev.nextInAEL = AelNext;
else m_ActiveEdges = AelNext;
if (AelNext != null)
AelNext.prevInAEL = AelPrev;
e.nextInAEL = null;
e.prevInAEL = null;
}
//------------------------------------------------------------------------------
private static void SwapPolyIndexes(TEdge edge1, TEdge edge2)
{
int outIdx = edge1.outIdx;
edge1.outIdx = edge2.outIdx;
edge2.outIdx = outIdx;
}
/// <summary>
/// Reset all fields to default values in preparation for object recycling
/// </summary>
public void PrepareForRecycle()
{
Y = new cInt();
LeftBound = RightBound = null;
Next = null;
}
//------------------------------------------------------------------------------
private static Int64 TopX(TEdge edge, Int64 currentY)
{
if (currentY == edge.ytop)
return edge.xtop;
return edge.xbot + Round(edge.dx *(currentY - edge.ybot));
}
//------------------------------------------------------------------------------
private bool IsTopHorz(TEdge horzEdge, double XPos)
{
TEdge e = m_SortedEdges;
while (e != null)
{
if ((XPos >= Math.Min(e.xcurr, e.xtop)) && (XPos <= Math.Max(e.xcurr, e.xtop)))
return false;
e = e.nextInSEL;
}
return true;
}
//------------------------------------------------------------------------------
private void AddHorzJoin(TEdge e, int idx)
{
HorzJoinRec hj = new HorzJoinRec();
hj.edge = e;
hj.savedIdx = idx;
m_HorizJoins.Add(hj);
}
//------------------------------------------------------------------------------
private void ProcessHorizontal(TEdge horzEdge)
{
Direction Direction;
Int64 horzLeft, horzRight;
if (horzEdge.xcurr < horzEdge.xtop)
{
horzLeft = horzEdge.xcurr;
horzRight = horzEdge.xtop;
Direction = Direction.dLeftToRight;
}
else
{
horzLeft = horzEdge.xtop;
horzRight = horzEdge.xcurr;
Direction = Direction.dRightToLeft;
}
TEdge eMaxPair;
if (horzEdge.nextInLML != null)
eMaxPair = null;
else
eMaxPair = GetMaximaPair(horzEdge);
TEdge e = GetNextInAEL(horzEdge, Direction);
while (e != null)
{
TEdge eNext = GetNextInAEL(e, Direction);
if (eMaxPair != null ||
((Direction == Direction.dLeftToRight) && (e.xcurr <= horzRight)) ||
((Direction == Direction.dRightToLeft) && (e.xcurr >= horzLeft)))
{
//ok, so far it looks like we're still in range of the horizontal edge
if (e.xcurr == horzEdge.xtop && eMaxPair == null)
{
if (SlopesEqual(e, horzEdge.nextInLML, m_UseFullRange))
{
//if output polygons share an edge, they'll need joining later ...
if (horzEdge.outIdx >= 0 && e.outIdx >= 0)
AddJoin(horzEdge.nextInLML, e, horzEdge.outIdx, -1);
break; //we've reached the end of the horizontal line
}
else if (e.dx < horzEdge.nextInLML.dx)
//we really have got to the end of the intermediate horz edge so quit.
//nb: More -ve slopes follow more +ve slopes ABOVE the horizontal.
break;
}
if (e == eMaxPair)
{
//horzEdge is evidently a maxima horizontal and we've arrived at its end.
if (Direction == Direction.dLeftToRight)
IntersectEdges(horzEdge, e, new IntPoint(e.xcurr, horzEdge.ycurr), 0);
else
IntersectEdges(e, horzEdge, new IntPoint(e.xcurr, horzEdge.ycurr), 0);
if (eMaxPair.outIdx >= 0) throw new ClipperException("ProcessHorizontal error");
return;
}
else if (e.dx == horizontal && !IsMinima(e) && !(e.xcurr > e.xtop))
{
if (Direction == Direction.dLeftToRight)
IntersectEdges(horzEdge, e, new IntPoint(e.xcurr, horzEdge.ycurr),
(IsTopHorz(horzEdge, e.xcurr)) ? Protects.ipLeft : Protects.ipBoth);
else
IntersectEdges(e, horzEdge, new IntPoint(e.xcurr, horzEdge.ycurr),
(IsTopHorz(horzEdge, e.xcurr)) ? Protects.ipRight : Protects.ipBoth);
}
else if (Direction == Direction.dLeftToRight)
{
IntersectEdges(horzEdge, e, new IntPoint(e.xcurr, horzEdge.ycurr),
(IsTopHorz(horzEdge, e.xcurr)) ? Protects.ipLeft : Protects.ipBoth);
}
else
{
IntersectEdges(e, horzEdge, new IntPoint(e.xcurr, horzEdge.ycurr),
(IsTopHorz(horzEdge, e.xcurr)) ? Protects.ipRight : Protects.ipBoth);
}
SwapPositionsInAEL(horzEdge, e);
}
else if ( (Direction == Direction.dLeftToRight &&
e.xcurr > horzRight && horzEdge.nextInSEL == null) ||
(Direction == Direction.dRightToLeft &&
e.xcurr < horzLeft && horzEdge.nextInSEL == null) ) break;
e = eNext;
} //end while ( e )
if (horzEdge.nextInLML != null)
{
if (horzEdge.outIdx >= 0)
AddOutPt(horzEdge, null, new IntPoint(horzEdge.xtop, horzEdge.ytop));
UpdateEdgeIntoAEL(ref horzEdge);
}
else
{
if (horzEdge.outIdx >= 0)
IntersectEdges(horzEdge, eMaxPair,
new IntPoint(horzEdge.xtop, horzEdge.ycurr), Protects.ipBoth);
DeleteFromAEL(eMaxPair);
DeleteFromAEL(horzEdge);
}
}
//------------------------------------------------------------------------------
private void AddJoin(TEdge e1, TEdge e2, int e1OutIdx, int e2OutIdx)
{
JoinRec jr = new JoinRec();
if (e1OutIdx >= 0)
jr.poly1Idx = e1OutIdx; else
jr.poly1Idx = e1.outIdx;
jr.pt1a = new IntPoint(e1.xcurr, e1.ycurr);
jr.pt1b = new IntPoint(e1.xtop, e1.ytop);
if (e2OutIdx >= 0)
jr.poly2Idx = e2OutIdx; else
jr.poly2Idx = e2.outIdx;
jr.pt2a = new IntPoint(e2.xcurr, e2.ycurr);
jr.pt2b = new IntPoint(e2.xtop, e2.ytop);
m_Joins.Add(jr);
}
//------------------------------------------------------------------------------
private bool ProcessIntersections(Int64 botY, Int64 topY)
{
if( m_ActiveEdges == null ) return true;
try {
BuildIntersectList(botY, topY);
if ( m_IntersectNodes == null) return true;
if ( FixupIntersections() ) ProcessIntersectList();
else return false;
}
catch {
m_SortedEdges = null;
DisposeIntersectNodes();
throw new ClipperException("ProcessIntersections error");
}
return true;
}
//------------------------------------------------------------------------------
private void AddLocalMinPoly(TEdge e1, TEdge e2, IntPoint pt)
{
if (e2.dx == horizontal || (e1.dx > e2.dx))
{
AddOutPt(e1, e2, pt);
e2.outIdx = e1.outIdx;
e1.side = EdgeSide.esLeft;
e2.side = EdgeSide.esRight;
}
else
{
AddOutPt(e2, e1, pt);
e1.outIdx = e2.outIdx;
e1.side = EdgeSide.esRight;
e2.side = EdgeSide.esLeft;
}
}
//------------------------------------------------------------------------------
private void SetHoleState(TEdge e, OutRec outRec)
{
bool isHole = false;
TEdge e2 = e.prevInAEL;
while (e2 != null)
{
if (e2.outIdx >= 0)
{
isHole = !isHole;
if (outRec.FirstLeft == null)
outRec.FirstLeft = m_PolyOuts[e2.outIdx];
}
e2 = e2.prevInAEL;
}
if (isHole) outRec.isHole = true;
}
//------------------------------------------------------------------------------
private void AppendPolygon(TEdge e1, TEdge e2)
{
//get the start and ends of both output polygons ...
OutRec outRec1 = m_PolyOuts[e1.outIdx];
OutRec outRec2 = m_PolyOuts[e2.outIdx];
//work out which polygon fragment has the correct hole state ...
OutRec holeStateRec = GetLowermostRec(outRec1, outRec2);
//fixup hole status ...
if (holeStateRec == outRec2)
outRec1.isHole = outRec2.isHole;
else
outRec2.isHole = outRec1.isHole;
OutPt p1_lft = outRec1.pts;
OutPt p1_rt = p1_lft.prev;
OutPt p2_lft = outRec2.pts;
OutPt p2_rt = p2_lft.prev;
EdgeSide side;
//join e2 poly onto e1 poly and delete pointers to e2 ...
if( e1.side == EdgeSide.esLeft )
{
if (e2.side == EdgeSide.esLeft)
{
//z y x a b c
ReversePolyPtLinks(p2_lft);
p2_lft.next = p1_lft;
p1_lft.prev = p2_lft;
p1_rt.next = p2_rt;
p2_rt.prev = p1_rt;
outRec1.pts = p2_rt;
} else
{
//x y z a b c
p2_rt.next = p1_lft;
p1_lft.prev = p2_rt;
p2_lft.prev = p1_rt;
p1_rt.next = p2_lft;
outRec1.pts = p2_lft;
}
side = EdgeSide.esLeft;
} else
{
if (e2.side == EdgeSide.esRight)
{
//a b c z y x
ReversePolyPtLinks( p2_lft );
p1_rt.next = p2_rt;
p2_rt.prev = p1_rt;
p2_lft.next = p1_lft;
p1_lft.prev = p2_lft;
} else
{
//a b c x y z
p1_rt.next = p2_lft;
p2_lft.prev = p1_rt;
p1_lft.prev = p2_rt;
p2_rt.next = p1_lft;
}
side = EdgeSide.esRight;
}
if (holeStateRec == outRec2)
{
outRec1.bottomPt = outRec2.bottomPt;
outRec1.bottomPt.idx = outRec1.idx;
outRec1.bottomE1 = outRec2.bottomE1;
outRec1.bottomE2 = outRec2.bottomE2;
if (outRec2.FirstLeft != outRec1)
outRec1.FirstLeft = outRec2.FirstLeft;
}
outRec2.pts = null;
outRec2.bottomPt = null;
outRec2.AppendLink = outRec1;
int OKIdx = e1.outIdx;
int ObsoleteIdx = e2.outIdx;
e1.outIdx = -1; //nb: safe because we only get here via AddLocalMaxPoly
e2.outIdx = -1;
TEdge e = m_ActiveEdges;
while( e != null )
{
if( e.outIdx == ObsoleteIdx )
{
e.outIdx = OKIdx;
e.side = side;
break;
}
e = e.nextInAEL;
}
for (int i = 0; i < m_Joins.Count; ++i)
{
if (m_Joins[i].poly1Idx == ObsoleteIdx) m_Joins[i].poly1Idx = OKIdx;
if (m_Joins[i].poly2Idx == ObsoleteIdx) m_Joins[i].poly2Idx = OKIdx;
}
for (int i = 0; i < m_HorizJoins.Count; ++i)
{
if (m_HorizJoins[i].savedIdx == ObsoleteIdx)
m_HorizJoins[i].savedIdx = OKIdx;
}
}
//------------------------------------------------------------------------------
private void SetWindingCount(TEdge edge)
{
TEdge e = edge.prevInAEL;
//find the edge of the same polytype that immediately preceeds 'edge' in AEL
while (e != null && e.polyType != edge.polyType)
e = e.prevInAEL;
if (e == null)
{
edge.windCnt = edge.windDelta;
edge.windCnt2 = 0;
e = m_ActiveEdges; //ie get ready to calc windCnt2
}
else if (IsEvenOddFillType(edge))
{
//even-odd filling ...
edge.windCnt = 1;
edge.windCnt2 = e.windCnt2;
e = e.nextInAEL; //ie get ready to calc windCnt2
}
else
{
//nonZero filling ...
if (e.windCnt * e.windDelta < 0)
{
if (Math.Abs(e.windCnt) > 1)
{
if (e.windDelta * edge.windDelta < 0)
edge.windCnt = e.windCnt;
else
edge.windCnt = e.windCnt + edge.windDelta;
}
else
edge.windCnt = e.windCnt + e.windDelta + edge.windDelta;
}
else
{
if (Math.Abs(e.windCnt) > 1 && e.windDelta * edge.windDelta < 0)
edge.windCnt = e.windCnt;
else if (e.windCnt + edge.windDelta == 0)
edge.windCnt = e.windCnt;
else
edge.windCnt = e.windCnt + edge.windDelta;
}
edge.windCnt2 = e.windCnt2;
e = e.nextInAEL; //ie get ready to calc windCnt2
}
//update windCnt2 ...
if (IsEvenOddAltFillType(edge))
{
//even-odd filling ...
while (e != edge)
{
edge.windCnt2 = (edge.windCnt2 == 0) ? 1 : 0;
e = e.nextInAEL;
}
}
else
{
//nonZero filling ...
while (e != edge)
{
edge.windCnt2 += e.windDelta;
e = e.nextInAEL;
}
}
}
//------------------------------------------------------------------------------
private void CopyAELToSEL()
{
TEdge e = m_ActiveEdges;
m_SortedEdges = e;
if (m_ActiveEdges == null)
return;
m_SortedEdges.prevInSEL = null;
e = e.nextInAEL;
while (e != null)
{
e.prevInSEL = e.prevInAEL;
e.prevInSEL.nextInSEL = e;
e.nextInSEL = null;
e = e.nextInAEL;
}
}
//------------------------------------------------------------------------------
public bool AddPath(List <IntPoint> pg, PolyType polyType, bool Closed)
{
#if use_lines
if (!Closed && polyType == PolyType.ptClip)
{
throw new ClipperException("AddPath: Open paths must be subject.");
}
#else
if (!Closed)
{
throw new ClipperException("AddPath: Open paths have been disabled.");
}
#endif
int highI = (int)pg.Count - 1;
bool ClosedOrSemiClosed = (highI > 0) && (Closed || (pg[0] == pg[highI]));
while (highI > 0 && (pg[highI] == pg[0]))
{
--highI;
}
while (highI > 0 && (pg[highI] == pg[highI - 1]))
{
--highI;
}
if ((Closed && highI < 2) || (!Closed && highI < 1))
{
return(false);
}
//create a new edge array ...
List <TEdge> edges = new List <TEdge>(highI + 1);
for (int i = 0; i <= highI; i++)
{
edges.Add(new TEdge());
}
//1. Basic initialization of Edges ...
try
{
edges[1].Curr = pg[1];
RangeTest(pg[0], ref m_UseFullRange);
RangeTest(pg[highI], ref m_UseFullRange);
InitEdge(edges[0], edges[1], edges[highI], pg[0]);
InitEdge(edges[highI], edges[0], edges[highI - 1], pg[highI]);
for (int i = highI - 1; i >= 1; --i)
{
RangeTest(pg[i], ref m_UseFullRange);
InitEdge(edges[i], edges[i + 1], edges[i - 1], pg[i]);
}
}
catch
{
return(false); //almost certainly a vertex has exceeded range
};
TEdge eStart = edges[0];
if (!ClosedOrSemiClosed)
{
eStart.Prev.OutIdx = Skip;
}
//2. Remove duplicate vertices, and collinear edges (when closed) ...
TEdge E = eStart, eLoopStop = eStart;
for (; ;)
{
if (E.Curr == E.Next.Curr)
{
//nb if E.OutIdx == Skip, it would have been semiOpen
if (E == eStart)
{
eStart = E.Next;
}
E = RemoveEdge(E);
eLoopStop = E;
continue;
}
if (E.Prev == E.Next)
{
break; //only two vertices
}
else if ((ClosedOrSemiClosed ||
(E.Prev.OutIdx != Skip && E.OutIdx != Skip &&
E.Next.OutIdx != Skip)) &&
SlopesEqual(E.Prev.Curr, E.Curr, E.Next.Curr, m_UseFullRange))
{
//All collinear edges are allowed for open paths but in closed paths
//inner vertices of adjacent collinear edges are removed. However if the
//PreserveCollinear property has been enabled, only overlapping collinear
//edges (ie spikes) are removed from closed paths.
if (Closed && (!PreserveCollinear ||
!Pt2IsBetweenPt1AndPt3(E.Prev.Curr, E.Curr, E.Next.Curr)))
{
if (E == eStart)
{
eStart = E.Next;
}
E = RemoveEdge(E);
E = E.Prev;
eLoopStop = E;
continue;
}
}
E = E.Next;
if (E == eLoopStop)
{
break;
}
}
if ((!Closed && (E == E.Next)) || (Closed && (E.Prev == E.Next)))
{
return(false);
}
m_edges.Add(edges);
if (!Closed)
{
m_HasOpenPaths = true;
}
//3. Do final Init and also find the 'highest' Edge. (nb: since I'm much
//more familiar with positive downwards Y axes, 'highest' here will be
//the Edge with the *smallest* Top.Y.)
TEdge eHighest = eStart;
E = eStart;
do
{
InitEdge2(E, polyType);
if (E.Top.Y < eHighest.Top.Y)
{
eHighest = E;
}
E = E.Next;
}while (E != eStart);
//4. build the local minima list ...
if (AllHorizontal(E))
{
if (ClosedOrSemiClosed)
{
E.Prev.OutIdx = Skip;
}
AscendToMax(ref E, false, false);
return(true);
}
//if eHighest is also the Skip then it's a natural break, otherwise
//make sure eHighest is positioned so we're either at a top horizontal or
//just starting to head down one edge of the polygon
E = eStart.Prev; //EStart.Prev == Skip edge
if (E.Prev == E.Next)
{
eHighest = E.Next;
}
else if (!ClosedOrSemiClosed && E.Top.Y == eHighest.Top.Y)
{
if ((IsHorizontal(E) || IsHorizontal(E.Next)) &&
E.Next.Bot.Y == eHighest.Top.Y)
{
eHighest = E.Next;
}
else if (SharedVertWithPrevAtTop(E))
{
eHighest = E;
}
else if (E.Top == E.Prev.Top)
{
eHighest = E.Prev;
}
else
{
eHighest = E.Next;
}
}
else
{
E = eHighest;
while (IsHorizontal(eHighest) ||
(eHighest.Top == eHighest.Next.Top) ||
(eHighest.Top == eHighest.Next.Bot)) //next is high horizontal
{
eHighest = eHighest.Next;
if (eHighest == E)
{
while (IsHorizontal(eHighest) || !SharedVertWithPrevAtTop(eHighest))
{
eHighest = eHighest.Next;
}
break; //avoids potential endless loop
}
}
}
E = eHighest;
do
{
E = AddBoundsToLML(E, Closed);
}while (E != eHighest);
return(true);
}
//------------------------------------------------------------------------------
private void DeleteFromSEL(TEdge e)
{
TEdge SelPrev = e.prevInSEL;
TEdge SelNext = e.nextInSEL;
if (SelPrev == null && SelNext == null && (e != m_SortedEdges))
return; //already deleted
if (SelPrev != null)
SelPrev.nextInSEL = SelNext;
else m_SortedEdges = SelNext;
if (SelNext != null)
SelNext.prevInSEL = SelPrev;
e.nextInSEL = null;
e.prevInSEL = null;
}
//------------------------------------------------------------------------------
private bool IsMinima(TEdge e)
{
return e != null && (e.prev.nextInLML != e) && (e.next.nextInLML != e);
}