Topic: How to get the entities which intersect a specific entity

[teslaxx]

My situation: I have a block which is formed from lots of lines, arcs and polylines and every lines, arcs and polylines is intersected by at least one leader (line with arrow) .
In the same time, every leader is connected to a text entity (which I want to modify).

How can I get the text, based on the intersections. I looked over the AutoCAD .NET Developer's Guide, but I din't find anything. Probably I need a method which returns a list with all the entities whichintersect the selected object. Any solutions?

P.S. I have another question: how can I get the closest entity from a specific point or from a specific entity?

[Jeff H]

It seems like Kerry has helped someone else out on how to find the closest entitiy to a point.
If I find the thread I will post it.

[Kerry]

I don't recall doing one Jeff ..

So cobbled this together for fun.
It's a little vulgar but does the job.


filters can be added.

Perhaps a SelectCrossingPolygon would be better for a more circular selection

but it doesn't have a forceSubEntitySelection option

ie: public PromptSelectionResult SelectCrossingWindow(Point3d pt1, Point3d pt2, SelectionFilter filter, bool forceSubEntitySelection);


added: I work in metric so I've used 1 and -1 for the growth vectors ... fine tune o suit

Code - C#: [Select]

1.  
2. // (C) CodeHimBelonga kdub@theSwamp 2010
3. //
4. using System;
5. using System.Windows.Forms;
6. using Autodesk.AutoCAD.ApplicationServices;
7. using Autodesk.AutoCAD.DatabaseServices;
8. using Autodesk.AutoCAD.EditorInput;
9. using Autodesk.AutoCAD.Geometry;
10. using Autodesk.AutoCAD.Runtime;
11. using AcadApp = Autodesk.AutoCAD.ApplicationServices.Application;
12.  
13. [assembly: CommandClass(typeof(kdub_Testing.SelectNearPoint))]
14.  
15. namespace kdub_Testing
16. {
17.     public class SelectNearPoint
18.     {
19.         /// <summary>
20.         ///
21.         /// </summary>
22.         [CommandMethod("sel5")]
23.         public void
24.             Select05()
25.         {
26.             Point3d pointToTry = new Point3d(0.0, 0.0, 0.0);
27.             ObjectIdCollection stuff;
28.  
29.             stuff = SelectSomewhereNearPoint(pointToTry);
30.  
31.             if(stuff.Count >= 1) {
32.                 string desc = (stuff.Count == 1) ? "  thingy." : "  thingies.";
33.                 System.Windows.Forms.MessageBox.Show("we collected  " + stuff.Count.ToString() + desc,
34.                                 "Wheeeeeee",
35.                                 MessageBoxButtons.OK,
36.                                 MessageBoxIcon.Information
37.                                 );
38.             } else {
39.                 System.Windows.Forms.MessageBox.Show("You Made Boo-Boo Selection",
40.                         "Oooooops",
41.                         MessageBoxButtons.OK,
42.                         MessageBoxIcon.Hand
43.                         );
44.             }
45.         }
46.         /// <summary>
47.         ///
48.         /// </summary>
49.         /// <param name="point"></param>
50.         /// <returns></returns>
51.         public static
52.             ObjectIdCollection SelectSomewhereNearPoint(Point3d point)
53.         {
54.             Editor ed = AcadApp.DocumentManager.MdiActiveDocument.Editor;
55.             Point3d ll = point;
56.             Point3d ur = point;
57.             Vector3d minus = new Vector3d(-1, -1, 0);
58.             Vector3d plus = new Vector3d(1, 1, 0);
59.             PromptSelectionResult result;
60.             result = ed.SelectCrossingWindow(ll, ur);
61.             while(result.Status != PromptStatus.OK) {
62.                 ll = ll.Add(minus);
63.                 ur = ur.Add(plus);
64.                 result = ed.SelectCrossingWindow(ll, ur);
65.             }
66.             return new ObjectIdCollection(result.Value.GetObjectIds());
67.         }
68.     }
69. }
70.  
71.