public void Add(SweepLineInterval sweepInt)
{
SweepLineEvent insertEvent = new SweepLineEvent(sweepInt.Min, null, sweepInt);
_events.Add(insertEvent);
_events.Add(new SweepLineEvent(sweepInt.Max, insertEvent, sweepInt));
}
/// <summary>
/// Initializes a new instance of the SweepLineEvent class.
/// </summary>
public SweepLineEvent(double x, SweepLineEvent insertEvent, SweepLineInterval sweepInt)
{
_xValue = x;
_insertEvent = insertEvent;
_eventType = INSERT;
if (insertEvent != null)
{
_eventType = DELETE;
}
_sweepInt = sweepInt;
}
} // private void BuildIndex()
/// <summary>
///
/// </summary>
/// <param name="action"></param>
public void ComputeOverlaps(ISweepLineOverlapAction action)
{
_nOverlaps = 0;
BuildIndex();
for (int i = 0; i < _events.Count; i++)
{
SweepLineEvent ev = (SweepLineEvent)_events[i];
SweepLineInterval sweepInt = ev.Interval;
if (ev.IsInsert)
{
ProcessOverlaps(i, ev.DeleteEventIndex, sweepInt, action);
}
} // for ( int i = 0; i < _events.Count; i++ )
} // public void ComputeOverlaps( SweepLineOverlapAction action )
} // public void ComputeOverlaps( SweepLineOverlapAction action )
private void ProcessOverlaps(int start, int end, SweepLineInterval s0, ISweepLineOverlapAction action)
{
/**
* Since we might need to test for self-intersections,
* include current insert event object in list of event objects to test.
* Last index can be skipped, because it must be a Delete event.
*/
for (int i = start; i < end; i++)
{
SweepLineEvent ev = (SweepLineEvent)_events[i];
if (ev.IsInsert)
{
SweepLineInterval s1 = ev.Interval;
action.Overlap(s0, s1);
_nOverlaps++;
}
} // for ( int i = start; i < end; i++ )
} // private void ProcessOverlaps( int start, int end, SweepLineInterval s0, SweepLineOverlapAction action )
