public override void Check(IEnumerable <ObjectId> selectedObjectIds)
{
if (!selectedObjectIds.Any())
{
return;
}
var originBspSegments = GetAllBspSegments(selectedObjectIds);
var bspSegmentForCollisions = new List <BspSegmentForCollsion>();
foreach (var bspSegment in originBspSegments)
{
// 将每个segment向外扩，形成一个矩形，矩形的宽为tolerance，但为了保险再向外扩0.001
var bspSegments = BspSegmentForCollsion.CreateSegmentsForCollision(bspSegment, _tolerance / 2.0 + 0.001);
bspSegmentForCollisions.AddRange(bspSegments);
}
var bsptree = new Curve2dBspTree(bspSegmentForCollisions);
var nearSegments = SearchNearSegments(bsptree);
var qualified = FilterNearSegments(nearSegments);
// Post process for nearSegmentPairs
_gaps = GetPolygonGapsFromSegmentPair(qualified);
foreach (var curveSegment in originBspSegments)
{
curveSegment.Dispose();
}
foreach (var bspSegmentForCollision in bspSegmentForCollisions)
{
bspSegmentForCollision.Dispose();
}
}
public static IEnumerable <BspSegmentForCollsion> CreateSegmentsForCollision(BspSegment segment, double range)
{
var startPoint = segment.LineSegment.StartPoint;
var endPoint = segment.LineSegment.EndPoint;
var direction = segment.LineSegment.Direction;
var perp = direction.GetPerpendicularVector().GetNormal() * range;
var topleft = startPoint + perp;
var topright = endPoint + perp;
var bottomleft = startPoint - perp;
var bottomright = endPoint - perp;
var topSegment = new BspSegmentForCollsion()
{
EntityId = segment.EntityId,
LineSegment = new LineSegment2d(topleft, topright),
SourceSegment = segment
};
var rightSegment = new BspSegmentForCollsion()
{
EntityId = segment.EntityId,
LineSegment = new LineSegment2d(topright, bottomright),
SourceSegment = segment
};
var bottomSegment = new BspSegmentForCollsion()
{
EntityId = segment.EntityId,
LineSegment = new LineSegment2d(bottomright, bottomleft),
SourceSegment = segment
};
var leftSegment = new BspSegmentForCollsion()
{
EntityId = segment.EntityId,
LineSegment = new LineSegment2d(bottomleft, topleft),
SourceSegment = segment
};
return(new BspSegmentForCollsion[]
{
topSegment,
rightSegment,
bottomSegment,
leftSegment
});
}
