internal static void computeFields(SweepEvent _event, SweepEvent prev, Operation operation)
{
if (prev == null) // compute inOut and otherInOut fields
{
_event.inOut = false;
_event.otherInOut = true;
}
else
{
if (_event.isSubject == prev.isSubject) // previous line segment in sweepline belongs to the same polygon
{
_event.inOut = !prev.inOut;
_event.otherInOut = prev.otherInOut;
}
else // previous line segment in sweepline belongs to the clipping polygon
{
_event.inOut = !prev.otherInOut;
_event.otherInOut = prev.isVertical() ? !prev.inOut : prev.inOut;
}
if (prev != null) // compute prevInResult field
{
_event.prevInResult = (!inResult(prev, operation) || prev.isVertical()) ? prev.prevInResult : prev;
}
}
// check if the line segment belongs to the Boolean operation
_event.inResult = inResult(_event, operation);
}
