实现与trim类似的功能时出现问题
对于多段的单折线实体，我希望在每个交叉点创建一个间隙。理想情况下，需要能够指定间隙距离。简单示例:
更复杂的示例:
基本代码大纲:
1 .从编辑器中获取折线实体。将多段线分解成单独的多段线。相互测试每条折线的交点(交点必须是“真实的”，例如，不能在两个连续的线段之间)
4。在每个特定半径的交叉点创建临时圆。对于每条折线，“修剪”圆内的内容*(从这一点开始有困难)*，从而删除交点
6。删除临时圆圈。对于每条现有的折线，如果可能的话，可以将它们连接起来，这样做
我面临的最大问题是在圆的交点处修剪每条折线-我只是不确定如何在代码中实现这一点
最终我希望能够将圆弧合并到折线中。
到目前为止我的代码(到第4点为止):
public static void SelfIntersectPline()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
Editor ed = doc.Editor;
PromptEntityOptions peo = new PromptEntityOptions(
"\nSelect Curve: ");
peo.SetRejectMessage("\nMust be a Curve...");
PromptEntityResult per = ed.GetEntity(peo);
if (per.Status != PromptStatus.OK) return;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
BlockTableRecord ms = tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
//get curve and explode into entities, store curves in entities dbobjectcollection
Curve curve = per.ObjectId.GetObject(OpenMode.ForRead) as Curve;
DBObjectCollection origDBObjects = new DBObjectCollection();
curve.Explode(origDBObjects);
//erase original curve
var originalCurve = (Entity)tr.GetObject(curve.ObjectId, OpenMode.ForWrite);
originalCurve.Erase();
//create temp dbcollection for circle entities
DBObjectCollection circleDBObjects = new DBObjectCollection();
//convert exploded curve entities to polylines
for (int i = origDBObjects.Count - 1; i >= 0; i--)
{
Curve curveObj = origDBObjects as Curve;
origDBObjects.Add(ConvertToPolyline(curveObj));
origDBObjects.RemoveAt(i);
}
//iterate through each polyline within entities collection
for (int i = 0; i < origDBObjects.Count; ++i)
{
for (int j = i + 1; j < origDBObjects.Count; ++j)
{
Polyline pl1 = origDBObjects as Polyline;
Polyline pl2 = origDBObjects as Polyline;
Point3dCollection points = new Point3dCollection();
//test for intersection(s)
pl1.IntersectWith(pl2, Intersect.OnBothOperands, points, IntPtr.Zero, IntPtr.Zero);
//validation for intersections
foreach (Point3d point in points)
{
// Skip the start/end points since they are connected vertices
if (point == pl1.StartPoint ||
point == pl1.EndPoint)
{
if (point == pl2.StartPoint ||
point == pl2.EndPoint)
{
// If two consecutive segments, then skip
if (j == i + 1)
{
continue;
}
}
}
//if genuine intersection detected, create temporary circle of specified radius at intersection
foreach (Point3d pt3d in points)
{
Circle c = new Circle();
c.Center = pt3d;
c.Radius = 0.5;
circleDBObjects.Add(c);
}
}
}
}
**** Hidden Message ***** 也许更直接的方法是使用GETSPLITCURVES使用交叉点来分割它们，然后减少分割曲线末端的长度。
分割曲线示例
https://forums.autodesk.com/t5/net/trim-function/td-p/7770714
更改长度（几乎是本示例中的最后一行）
http://docs.autodesk.com/ACD/2010/ENU/AutoCAD%20.NET%20Developer%27s%20Guide/index.html?url=WS1a9193826455f5ff2566ffd511ff6f8c7ca-3e52.htm,topicNumber=d0e25580
像这样？https://www.theswamp.org/index.php?topic = 43599 . msg 488882 # msg 488882 相像的希望它能够处理自相交多段线
从我最初的帖子开始，我已经取得了一些进展，如果一切顺利的话，以后可能会有一些代码。
都整理好了。
最大的障碍是，在将intercept point3dcollection插入GetSplitCurves之前，应该按照距起点的距离顺序对其进行排序。
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