Topic: how to find itersection points

[xsakabsx]

how to find intersection point of polyline and cirle ?

Sorry for bad ENG (rus to eng)

[gile]

Hi,

Look at the Entity.Intersectwith() method.

Here's a little C# sample:

Code - C#: [Select]

1.         [CommandMethod("Test")]
2.         public void Test()
3.         {
4.             Document doc = AcAp.DocumentManager.MdiActiveDocument;
5.             Database db = doc.Database;
6.             Editor ed = doc.Editor;
7.             PromptEntityOptions peo = new PromptEntityOptions("\nSelect the first curve: ");
8.             peo.SetRejectMessage("Only a curve !");
9.             peo.AddAllowedClass(typeof(Curve), false);
10.             PromptEntityResult per = ed.GetEntity(peo);
11.             if (per.Status != PromptStatus.OK) return;
12.             ObjectId id1 = per.ObjectId;
13.             peo.Message = "\nSelect the second curve: ";
14.             per = ed.GetEntity(peo);
15.             if (per.Status != PromptStatus.OK) return;
16.             ObjectId id2 = per.ObjectId;
17.             using (Transaction tr = db.TransactionManager.StartTransaction())
18.             {
19.                 Curve curve1 = (Curve)tr.GetObject(id1, OpenMode.ForRead);
20.                 Curve curve2 = (Curve)tr.GetObject(id2, OpenMode.ForRead);
21.                 Point3dCollection pts = new Point3dCollection();
22.                 curve1.IntersectWith(curve2, Intersect.OnBothOperands, pts, 0, 0);
23.                 BlockTableRecord ms = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
24.                 foreach (Point3d pt in pts)
25.                 {
26.                     ed.WriteMessage("\n" + pt.ToString());
27.                     Circle c = new Circle(pt, Vector3d.ZAxis, 10.0);
28.                     ms.AppendEntity(c);
29.                     tr.AddNewlyCreatedDBObject(c, true);
30.                 }
31.                 tr.Commit();
32.             }
33.         }