AutoCAD.Net/C#.Net QQ群:193522571 点选多段线时取得当前多段线的两端点

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.GraphicsInterface;
using Autodesk.AutoCAD.Colors;
//_____________________________________//

[CommandMethod("colseg")]
public void ColoredSegment()
{

Document doc = Application.DocumentManager.MdiActiveDocument;

Database db = doc.Database;

Editor ed = doc.Editor;

PromptEntityOptions peo = new PromptEntityOptions("\nSelect Segment of Polyline:");

peo.SetRejectMessage("\nMust be a Polyline!");

peo.AddAllowedClass(typeof(Autodesk.AutoCAD.Databa​seServices.Polyline), false);

PromptEntityResult per = ed.GetEntity(peo);

if (per.Status != PromptStatus.OK)

return;

Transaction tr = db.TransactionManager.StartTransaction();

Autodesk.AutoCAD.DatabaseServices.Polyline pl = new Autodesk.AutoCAD.DatabaseServices.Polyline();

IntegerCollection ic = new IntegerCollection();

using (tr)
{
Autodesk.AutoCAD.DatabaseServices.Polyline pline = tr.GetObject(per.ObjectId, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Polyline;

if (pline != null)
{
BlockTableRecord btr = (BlockTableRecord)tr.GetObject(pline.OwnerId, OpenMode.ForWrite);

double bulg = 0;

Point3d picked = pline.GetClosestPointTo((Point3d)per.PickedPoint, false);

double par = pline.GetParameterAtPoint(picked);

int m = (int)par;

Point2dCollection verts = new Point2dCollection(2);

SegmentType stype = pline.GetSegmentType(m);

if (stype == SegmentType.Arc)
{
CircularArc2d arc = pline.GetArcSegment2dAt(m);

bulg = pline.GetBulgeAt(m);

verts.Add(arc.StartPoint);

verts.Add(arc.EndPoint);
}
else if (stype == SegmentType.Line)
{
LineSegment2d ln = pline.GetLineSegment2dAt(m);

verts.Add(ln.StartPoint);

verts.Add(ln.EndPoint);

bulg = 0;
}

pl.AddVertexAt(0, verts[0], bulg, 0, 0);

pl.AddVertexAt(1, verts[1], 0, 0, 0);

pl.ColorIndex = 121;

ObjectIdCollection ids = new ObjectIdCollection();

btr.AppendEntity(pl);

tr.AddNewlyCreatedDBObject(pl, true);

verts = new Point2dCollection();

if (pl != null)
{
TransientManager tm = TransientManager.CurrentTransientManager;
tm.AddTransient(pl, TransientDrawingMode.Highlight, 128, ic);

}
}

if (pl != null)
{
pl.Erase();

pl.Dispose();// optional, might be removed
}

tr.Commit();
// pause for user input only
string key = ed.GetString("\nPress any key: ").StringResult;

TransientManager.CurrentTransientManager.EraseTran​sient(pline, ic);

}

}