private IntersectionInfo CalcApparentIntersection(CurveVertex source, CurveVertex target, Transaction transaction)
{
var sourceEntity = transaction.GetObject(source.Id, OpenMode.ForRead);
var targetEntity = transaction.GetObject(target.Id, OpenMode.ForRead);
// Source curve
var desiredSourceExtend = CurveUtils.GetExtendType((Curve)sourceEntity, source.Point);
var sourceLine = sourceEntity as Line;
var sourceArc = sourceEntity as Arc;
var sourcePolyline = sourceEntity as Autodesk.AutoCAD.DatabaseServices.Polyline;
var sourcePolyline2d = sourceEntity as Polyline2d;
if (sourcePolyline != null)
{
sourceLine = CurveUtils.CutOutLineFromPolyLine(sourcePolyline, source.Point);
}
else if (sourcePolyline2d != null)
{
sourceLine = CurveUtils.CutOutLineFromPolyline2d(sourcePolyline2d, source.Point, transaction);
}
// Target curve
var desiredTargetExtend = CurveUtils.GetExtendType((Curve)targetEntity, target.Point);
var targetLine = targetEntity as Line;
var targetArc = targetEntity as Arc;
var targetPolyline = targetEntity as Autodesk.AutoCAD.DatabaseServices.Polyline;
var targetPolyline2d = targetEntity as Polyline2d;
if (targetPolyline != null)
{
targetLine = CurveUtils.CutOutLineFromPolyLine(targetPolyline, target.Point);
}
else if (targetPolyline2d != null)
{
targetLine = CurveUtils.CutOutLineFromPolyline2d(targetPolyline2d, target.Point, transaction);
}
// Calculate intersection.
var results = new List <IntersectionInfo>();
if (sourceLine != null && targetLine != null)
{
// Line && Line
var info = CurveIntersectUtils.InsersectLines(sourceLine, targetLine);
if (info != null)
{
info.SourceId = source.Id;
info.TargetId = target.Id;
results.Add(info);
}
}
else if (sourceLine != null && targetArc != null)
{
// Line && Arc
var infos = CurveIntersectUtils.IntersectLineArc(sourceLine, targetArc, coerceArcExtendType: desiredTargetExtend);
foreach (var info in infos)
{
info.SourceId = source.Id;
info.TargetId = target.Id;
}
results.AddRange(infos);
}
else if (sourceArc != null && targetLine != null)
{
// Arc && Line
var infos = CurveIntersectUtils.IntersectLineArc(targetLine, sourceArc, coerceArcExtendType: desiredSourceExtend);
foreach (var info in infos)
{
// Exchange entend type.
var newInfo = new IntersectionInfo(source.Id, info.TargetExtendType, target.Id,
info.SourceExtendType, info.IntersectPoint);
results.Add(newInfo);
}
}
else if (sourceArc != null && targetArc != null)
{
// Arc && Arc
var infos = CurveIntersectUtils.IntersectArcs(sourceArc, desiredSourceExtend, targetArc,
desiredTargetExtend);
foreach (var info in infos)
{
info.SourceId = source.Id;
info.TargetId = target.Id;
}
results.AddRange(infos);
}
IntersectionInfo result = null;
foreach (var info in results)
{
var valid = CheckIntersectionInfo(info, desiredSourceExtend, source.Point, desiredTargetExtend, target.Point, _tolerance);
if (valid)
{
result = info;
break;
}
}
return(result);
}
private IntersectionInfo GetUnderShootIntersection(CurveVertex vertex, Transaction transaction, double tolerance)
{
var curve = transaction.GetObject(vertex.Id, OpenMode.ForRead);
var desiredExtend = CurveUtils.GetExtendType((Curve)curve, vertex.Point);
var line = curve as Line;
var arc = curve as Arc;
var polyline = curve as Polyline;
var polyline2d = curve as Polyline2d;
if (polyline != null)
{
line = CurveUtils.CutOutLineFromPolyLine(polyline, vertex.Point);
}
else if (polyline2d != null)
{
line = CurveUtils.CutOutLineFromPolyline2d(polyline2d, vertex.Point, transaction);
}
// Construct a polygon to get adjacent entities.
Point3dCollection polygon = null;
if (line != null)
{
var direction = line.EndPoint - line.StartPoint;
if (desiredExtend == ExtendType.ExtendStart)
{
direction = -1.0 * direction;
}
polygon = BuildSelectionPolygonForLine(vertex.Point, direction, tolerance);
}
else if (arc != null)
{
polygon = BuildSelectionPolygonForArc(vertex.Point, tolerance);
}
// Zoom window
var minPt = new Point3d(vertex.Point.X - tolerance, vertex.Point.Y - tolerance, 0.0);
var maxPt = new Point3d(vertex.Point.X + tolerance, vertex.Point.Y + tolerance, 0.0);
var extents = new Extents3d(minPt, maxPt);
Editor.ZoomToWin(extents, factor: 2.0);
var selectionResult = Editor.SelectCrossingPolygon(polygon, SelectionFilterUtils.OnlySelectCurve());
if (selectionResult.Status != PromptStatus.OK || selectionResult.Value == null)
{
return(null);
}
// Check each adjacent entity whether they are intersected.
var intersectionInfos = new List <IntersectionInfo>();
var adjacentIds = selectionResult.Value.GetObjectIds();
foreach (ObjectId objId in adjacentIds)
{
var targetCurve = transaction.GetObject(objId, OpenMode.ForRead) as Curve;
if (targetCurve == null)
{
continue;
}
// Calculate the intersection
IntersectionInfo info = null;
if (line != null)
{
info = IntersectLineAndCurve(line, targetCurve, vertex.Point, desiredExtend);
}
else if (arc != null)
{
info = IntersectArcAndCurve(arc, targetCurve, vertex.Point, desiredExtend);
}
if (info != null && info.SourceExtendType == desiredExtend)
{
info.SourceId = vertex.Id;
info.TargetId = objId;
intersectionInfos.Add(info);
}
}
// Get nearest point.
if (intersectionInfos.Count <= 0)
{
return(null);
}
var nearest = intersectionInfos[0];
var nearsetDist = (intersectionInfos[0].IntersectPoint - vertex.Point).Length;
for (int i = 1; i < intersectionInfos.Count; i++)
{
var dist = (intersectionInfos[i].IntersectPoint - vertex.Point).Length;
if (dist < nearsetDist)
{
nearsetDist = dist;
nearest = intersectionInfos[i];
}
}
if (nearsetDist.Larger(tolerance))
{
return(null);
}
return(nearest);
}