//------------------------------------------------------------------------------
internal bool PointInPolygon(IntPoint pt, OutPt pp, bool UseFulllongRange)
{
OutPt pp2 = pp;
bool result = false;
if (UseFulllongRange)
{
do
{
if ((((pp2.pt.Y <= pt.Y) && (pt.Y < pp2.prev.pt.Y)) ||
((pp2.prev.pt.Y <= pt.Y) && (pt.Y < pp2.pt.Y))) &&
new Int128(pt.X - pp2.pt.X) <
Int128.Int128Mul(pp2.prev.pt.X - pp2.pt.X, pt.Y - pp2.pt.Y) /
new Int128(pp2.prev.pt.Y - pp2.pt.Y))
result = !result;
pp2 = pp2.next;
}
while (pp2 != pp);
}
else
{
do
{
if ((((pp2.pt.Y <= pt.Y) && (pt.Y < pp2.prev.pt.Y)) ||
((pp2.prev.pt.Y <= pt.Y) && (pt.Y < pp2.pt.Y))) &&
(pt.X - pp2.pt.X < (pp2.prev.pt.X - pp2.pt.X) * (pt.Y - pp2.pt.Y) /
(pp2.prev.pt.Y - pp2.pt.Y))) result = !result;
pp2 = pp2.next;
}
while (pp2 != pp);
}
return result;
}
//------------------------------------------------------------------------------
internal bool PointIsVertex(IntPoint pt, OutPt pp)
{
OutPt pp2 = pp;
do
{
if (PointsEqual(pp2.pt, pt)) return true;
pp2 = pp2.next;
}
while (pp2 != pp);
return false;
}
//------------------------------------------------------------------------------
internal bool PointOnPolygon(IntPoint pt, OutPt pp, bool UseFullInt64Range)
{
OutPt pp2 = pp;
while (true)
{
if (PointOnLineSegment(pt, pp2.pt, pp2.next.pt, UseFullInt64Range))
return true;
pp2 = pp2.next;
if (pp2 == pp) break;
}
return false;
}
//----------------------------------------------------------------------
private void FixupJoinRecs(JoinRec j, OutPt pt, int startIdx)
{
for (int k = startIdx; k < m_Joins.Count; k++)
{
JoinRec j2 = m_Joins[k];
if (j2.poly1Idx == j.poly1Idx && PointIsVertex(j2.pt1a, pt))
j2.poly1Idx = j.poly2Idx;
if (j2.poly2Idx == j.poly1Idx && PointIsVertex(j2.pt2a, pt))
j2.poly2Idx = j.poly2Idx;
}
}
//----------------------------------------------------------------------
private bool Poly2ContainsPoly1(OutPt outPt1, OutPt outPt2, bool UseFullInt64Range)
{
OutPt pt = outPt1;
//Because the polygons may be touching, we need to find a vertex that
//isn't touching the other polygon ...
if (PointOnPolygon(pt.pt, outPt2, UseFullInt64Range))
{
pt = pt.next;
while (pt != outPt1 && PointOnPolygon(pt.pt, outPt2, UseFullInt64Range))
pt = pt.next;
if (pt == outPt1) return true;
}
return PointInPolygon(pt.pt, outPt2, UseFullInt64Range);
}
//------------------------------------------------------------------------------
private int PointCount(OutPt pts)
{
if (pts == null) return 0;
int result = 0;
OutPt p = pts;
do
{
result++;
p = p.next;
}
while (p != pts);
return result;
}
//------------------------------------------------------------------------------
private bool JoinPoints(JoinRec j, out OutPt p1, out OutPt p2)
{
p1 = null; p2 = null;
OutRec outRec1 = m_PolyOuts[j.poly1Idx];
OutRec outRec2 = m_PolyOuts[j.poly2Idx];
if (outRec1 == null || outRec2 == null) return false;
OutPt pp1a = outRec1.pts;
OutPt pp2a = outRec2.pts;
IntPoint pt1 = j.pt2a, pt2 = j.pt2b;
IntPoint pt3 = j.pt1a, pt4 = j.pt1b;
if (!FindSegment(ref pp1a, m_UseFullRange, ref pt1, ref pt2)) return false;
if (outRec1 == outRec2)
{
//we're searching the same polygon for overlapping segments so
//segment 2 mustn't be the same as segment 1 ...
pp2a = pp1a.next;
if (!FindSegment(ref pp2a, m_UseFullRange, ref pt3, ref pt4) || (pp2a == pp1a))
return false;
}
else if (!FindSegment(ref pp2a, m_UseFullRange, ref pt3, ref pt4)) return false;
if (!GetOverlapSegment(pt1, pt2, pt3, pt4, ref pt1, ref pt2)) return false;
OutPt p3, p4, prev = pp1a.prev;
//get p1 & p2 polypts - the overlap start & endpoints on poly1
if (PointsEqual(pp1a.pt, pt1)) p1 = pp1a;
else if (PointsEqual(prev.pt, pt1)) p1 = prev;
else p1 = InsertPolyPtBetween(pp1a, prev, pt1);
if (PointsEqual(pp1a.pt, pt2)) p2 = pp1a;
else if (PointsEqual(prev.pt, pt2)) p2 = prev;
else if ((p1 == pp1a) || (p1 == prev))
p2 = InsertPolyPtBetween(pp1a, prev, pt2);
else if (Pt3IsBetweenPt1AndPt2(pp1a.pt, p1.pt, pt2))
p2 = InsertPolyPtBetween(pp1a, p1, pt2);
else
p2 = InsertPolyPtBetween(p1, prev, pt2);
//get p3 & p4 polypts - the overlap start & endpoints on poly2
prev = pp2a.prev;
if (PointsEqual(pp2a.pt, pt1)) p3 = pp2a;
else if (PointsEqual(prev.pt, pt1)) p3 = prev;
else p3 = InsertPolyPtBetween(pp2a, prev, pt1);
if (PointsEqual(pp2a.pt, pt2)) p4 = pp2a;
else if (PointsEqual(prev.pt, pt2)) p4 = prev;
else if ((p3 == pp2a) || (p3 == prev))
p4 = InsertPolyPtBetween(pp2a, prev, pt2);
else if (Pt3IsBetweenPt1AndPt2(pp2a.pt, p3.pt, pt2))
p4 = InsertPolyPtBetween(pp2a, p3, pt2);
else
p4 = InsertPolyPtBetween(p3, prev, pt2);
//p1.pt == p3.pt and p2.pt == p4.pt so join p1 to p3 and p2 to p4 ...
if (p1.next == p2 && p3.prev == p4)
{
p1.next = p3;
p3.prev = p1;
p2.prev = p4;
p4.next = p2;
return true;
}
else if (p1.prev == p2 && p3.next == p4)
{
p1.prev = p3;
p3.next = p1;
p2.next = p4;
p4.prev = p2;
return true;
}
else
return false; //an orientation is probably wrong
}
//------------------------------------------------------------------------------
private OutPt GetBottomPt(OutPt pp)
{
OutPt dups = null;
OutPt p = pp.next;
while (p != pp)
{
if (p.pt.Y > pp.pt.Y)
{
pp = p;
dups = null;
}
else if (p.pt.Y == pp.pt.Y && p.pt.X <= pp.pt.X)
{
if (p.pt.X < pp.pt.X)
{
dups = null;
pp = p;
}
else
{
if (p.next != pp && p.prev != pp) dups = p;
}
}
p = p.next;
}
if (dups != null)
{
//there appears to be at least 2 vertices at bottomPt so ...
while (dups != p)
{
if (!FirstIsBottomPt(p, dups)) pp = dups;
dups = dups.next;
while (!PointsEqual(dups.pt, pp.pt)) dups = dups.next;
}
}
return pp;
}
//------------------------------------------------------------------------------
private void ReversePolyPtLinks(OutPt pp)
{
if (pp == null) return;
OutPt pp1;
OutPt pp2;
pp1 = pp;
do
{
pp2 = pp1.next;
pp1.next = pp1.prev;
pp1.prev = pp2;
pp1 = pp2;
} while (pp1 != pp);
}
//---------------------------------------------------------------------------
private bool FirstIsBottomPt(OutPt btmPt1, OutPt btmPt2)
{
OutPt p = btmPt1.prev;
while (PointsEqual(p.pt, btmPt1.pt) && (p != btmPt1)) p = p.prev;
double dx1p = Math.Abs(GetDx(btmPt1.pt, p.pt));
p = btmPt1.next;
while (PointsEqual(p.pt, btmPt1.pt) && (p != btmPt1)) p = p.next;
double dx1n = Math.Abs(GetDx(btmPt1.pt, p.pt));
p = btmPt2.prev;
while (PointsEqual(p.pt, btmPt2.pt) && (p != btmPt2)) p = p.prev;
double dx2p = Math.Abs(GetDx(btmPt2.pt, p.pt));
p = btmPt2.next;
while (PointsEqual(p.pt, btmPt2.pt) && (p != btmPt2)) p = p.next;
double dx2n = Math.Abs(GetDx(btmPt2.pt, p.pt));
return (dx1p >= dx2p && dx1p >= dx2n) || (dx1n >= dx2p && dx1n >= dx2n);
}
//------------------------------------------------------------------------------
private OutPt InsertPolyPtBetween(OutPt p1, OutPt p2, IntPoint pt)
{
OutPt result = new OutPt();
result.pt = pt;
if (p2 == p1.next)
{
p1.next = result;
p2.prev = result;
result.next = p2;
result.prev = p1;
}
else
{
p2.next = result;
p1.prev = result;
result.next = p1;
result.prev = p2;
}
return result;
}
//------------------------------------------------------------------------------
private bool FindSegment(ref OutPt pp, bool UseFullInt64Range,
ref IntPoint pt1, ref IntPoint pt2)
{
if (pp == null) return false;
OutPt pp2 = pp;
IntPoint pt1a = new IntPoint(pt1);
IntPoint pt2a = new IntPoint(pt2);
do
{
if (SlopesEqual(pt1a, pt2a, pp.pt, pp.prev.pt, UseFullInt64Range) &&
SlopesEqual(pt1a, pt2a, pp.pt, UseFullInt64Range) &&
GetOverlapSegment(pt1a, pt2a, pp.pt, pp.prev.pt, ref pt1, ref pt2))
return true;
pp = pp.next;
}
while (pp != pp2);
return false;
}
//------------------------------------------------------------------------------
private void AddOutPt(TEdge e, IntPoint pt)
{
bool ToFront = (e.side == EdgeSide.esLeft);
if (e.outIdx < 0)
{
OutRec outRec = CreateOutRec();
e.outIdx = outRec.idx;
OutPt op = new OutPt();
outRec.pts = op;
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, op2;
if (ToFront && PointsEqual(pt, op.pt) ||
(!ToFront && PointsEqual(pt, op.prev.pt))) return;
op2 = new OutPt();
op2.pt = pt;
op2.idx = outRec.idx;
op2.next = op;
op2.prev = op.prev;
op2.prev.next = op2;
op.prev = op2;
if (ToFront) outRec.pts = op2;
}
}
//------------------------------------------------------------------------------
private void DisposeOutPts(OutPt pp)
{
if (pp == null) return;
OutPt tmpPp = null;
pp.prev.next = null;
while (pp != null)
{
tmpPp = pp;
pp = pp.next;
tmpPp = null;
}
}