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Apply bug fix from upstream clipper 

Clipper fix in commit [r463] for bug repport #92 (http://sourceforge.net/p/polyclipping/code/463/tree//trunk/cpp/clipper.cpp?diff=504b9404fd48f873331e913b:462)
is applied here.
visilibity
Petr Ledvina 2014-04-22 15:19:35 +02:00
parent c4bfe64fb8
commit c30040b691
1 changed files with 14 additions and 4 deletions
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18
xs/src/clipper.cpp
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@ -1030,10 +1030,20 @@ TEdge* ClipperBase::ProcessBound(TEdge* E, bool IsClockwise)
cInt StartX;
if (IsHorizontal(*E))
{
//it's possible for adjacent overlapping horz edges to start heading left
//before finishing right, so ...
if (IsClockwise) StartX = E->Prev->Bot.X;
else StartX = E->Next->Bot.X;
//first we need to be careful here with open paths because this
//may not be a true local minima (ie may be following a skip edge).
//also, watch for adjacent horz edges to start heading left
//before finishing right ...
if (IsClockwise)
{
if (E->Prev->Bot.Y == E->Bot.Y) StartX = E->Prev->Bot.X;
else StartX = E->Prev->Top.X;
}
else
{
if (E->Next->Bot.Y == E->Bot.Y) StartX = E->Next->Bot.X;
else StartX = E->Next->Top.X;
}
if (E->Bot.X != StartX) ReverseHorizontal(*E);
}