topic Re: Any way to get points used in GetSelection? in .NET Forum

Any way to get points used in GetSelection?

deltacadd — Mon, 06 Jul 2015 09:59:27 GMT

Is there any way to retrieve the list of points used for selecting objects when the Editor.GetSelection() method is run?

What I want is something like this:

Command: MyCommand

Select objects: WP

First polygon point: <Point picked>

Specify endpoint of line or [Undo]: <Point picked>

...

Specify endpoint of line or [Undo]: <ENTER>

The list of points is: <x,y>,<x,y>,<x,y>,<x,y>

Any help is much appreciated.

Re: Any way to get points used in GetSelection?

deltacadd — Tue, 07 Jul 2015 05:20:00 GMT

Never mind, I figured it out myself. Here is the code:

  class CommandShowPoints
  {
    Point3dCollection m_pts = new Point3dCollection();
    public CommandShowPoints()
    {
      Editor ed = AcadApp.DocumentManager.MdiActiveDocument.Editor;
      PromptSelectionOptions pso = new PromptSelectionOptions();
      ed.PointMonitor += ed_PointMonitor;
      PromptSelectionResult psr = ed.GetSelection();
      ed.PointMonitor -= ed_PointMonitor;
      if (psr.Status == PromptStatus.Cancel) return;

      ed.WriteMessage("\nList of picked points\n");
      foreach (Point3d pt in m_pts) 
      {
        ed.WriteMessage(string.Format("\n{0}", pt)); 
      }
    }

    void ed_PointMonitor(object sender, PointMonitorEventArgs e)
    {
      Point3d ptLast = e.Context.LastPoint;
      if ((ptLast != Point3d.Origin) && (m_pts.Contains(e.Context.LastPoint) == false)) 
      {
        m_pts.Add(e.Context.LastPoint);
      }
    }
  }

Now, is there any way to know if the user select a "Window", "Crossing", "WindowPolygon" etc for the selection? I am not interested in querying the entities that are in the selection set, using the "SelectedObject.SelectionMethod", since the window / crossing / whatever, may not result in a SelectionSet at all.

Re: Any way to get points used in GetSelection?

SENL1362 — Tue, 07 Jul 2015 07:42:15 GMT

The following sample evaluate the Selection details, inclusive the Picked Points. No need for Point monitor

        [CommandMethod("TestSelection")]
        public static void TestSelection()
        {
            Document doc = null;
            Database db = null;
            Editor ed = null;

            try
            {
                doc = AcadApp.DocumentManager.MdiActiveDocument;
                if (doc == null)
                    throw new System.Exception("\n Drawing Document required");
                db = doc.Database;
                ed = doc.Editor;

                //Select Objects, use ed.GetSelection to benefit from Window/Crossing selection visual feedback
                PromptSelectionOptions pso = new PromptSelectionOptions();
                pso.MessageForAdding = "Select  Objects";
                pso.SingleOnly = false;
                PromptSelectionResult psr = ed.GetSelection(pso);
                if (psr.Status != PromptStatus.OK)
                    return;

                SelectionSetDelayMarshalled ssMarshal = (SelectionSetDelayMarshalled)psr.Value;
                AdsName name = ssMarshal.Name;
                var selObjIds = ssMarshal.GetObjectIds();
                ed.WriteMessage("\n {0} Objects selected", selObjIds.Length);
                for (int i = 0; i < selObjIds.Length; i++)
                    ed.WriteMessage("\n\t [{0}]: {1} ({2})", i, selObjIds[i].ObjectClass.DxfName, selObjIds[i].Handle);

                SelectionSet selSet = (SelectionSet)ssMarshal;
                ed.WriteMessage("\n {0} Selections in SelectionSet", selSet.Count);

                foreach (SelectedObject ssItem in selSet)
                {
                    ed.WriteMessage("\n\t {0} Selected: {1} ({2})", Enum.GetName(typeof(SelectionMethod), ssItem.SelectionMethod), ssItem.ObjectId.ObjectClass.DxfName, ssItem.ObjectId.Handle);
                    switch (ssItem.SelectionMethod)
                    {
                        case SelectionMethod.PickPoint:
                            PickPointSelectedObject ppSelObj = ssItem as PickPointSelectedObject;
                            Point3d pickedPoint = ppSelObj.PickPoint.PointOnLine;
                            ed.WriteMessage("\n\t\t Selected at: {0}", pickedPoint.ToString());
                            break;

                        case SelectionMethod.Crossing:
                            CrossingOrWindowSelectedObject crossSelObj = ssItem as CrossingOrWindowSelectedObject;
                            PickPointDescriptor[] crossSelPickedPoints = crossSelObj.GetPickPoints();
                            ed.WriteMessage("\n\t\t Crossing at: {0}..{1}", crossSelPickedPoints[0].PointOnLine.ToString(), crossSelPickedPoints[1].PointOnLine.ToString());
                            break;

                        case SelectionMethod.Window:
                            CrossingOrWindowSelectedObject windSelObj = ssItem as CrossingOrWindowSelectedObject;
                            PickPointDescriptor[] winSelPickedPoints = windSelObj.GetPickPoints();
                            ed.WriteMessage("\n\t\t Window at: {0}..{1}", winSelPickedPoints[0].PointOnLine.ToString(), winSelPickedPoints[1].PointOnLine.ToString());
                            break;

                    }
                }
            }
            catch (System.Exception ex)
            {
                if (ed != null)
                    ed.WriteMessage(ex.Message);
                else
                    System.Windows.Forms.MessageBox.Show(ex.Message,
                                "TestSelection",
                                System.Windows.Forms.MessageBoxButtons.OK,
                                System.Windows.Forms.MessageBoxIcon.Error);
            }
        }

Re: Any way to get points used in GetSelection?

deltacadd — Tue, 07 Jul 2015 11:43:32 GMT

Not sure why, but running the above code shows the last two points for all the entities, if I have selected say a Window Polygon. See example below:

Output:

Command: tss

Select  Objects: wp

First polygon point:
Specify endpoint of line or [Undo]:
Specify endpoint of line or [Undo]:
Specify endpoint of line or [Undo]:
Specify endpoint of line or [Undo]:
Specify endpoint of line or [Undo]:
Specify endpoint of line or [Undo]:
12 found

Select  Objects:

 12 Objects selected
 12 Selections in SelectionSet
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)
Window at: 
(1886.16856979758,755.163512841775,0)..(1888.90531905888,952.047645899205,0)

Except for commenting the additional WriteMessages, no other change to the code you have supplied. Any idea why this is happening?

Re: Any way to get points used in GetSelection?

SENL1362 — Tue, 07 Jul 2015 13:07:57 GMT

The sample assumed rectangular window (or crossing) selections only. For polygone selections use this slightly modified code.

                           ...
 PickPointDescriptor[] crossSelPickedPoints = crossSelObj.GetPickPoints();
                            if (crossSelPickedPoints != null)
                            {
                                for (int i = 0; i < crossSelPickedPoints.Length;i++ )
                                    ed.WriteMessage("\n\t\t Crossing at[{0}]: {1}", i,crossSelPickedPoints[i].PointOnLine.ToString());
                            }
                            }
                            break;

                        case SelectionMethod.Window:
                            CrossingOrWindowSelectedObject windSelObj = ssItem as CrossingOrWindowSelectedObject;
                            PickPointDescriptor[] winSelPickedPoints = windSelObj.GetPickPoints();
                            if (winSelPickedPoints != null)
                            {
                                for (int i = 0; i < winSelPickedPoints.Length; i++)
                                    ed.WriteMessage("\n\t\t Window at[{0}]: {1}", i, winSelPickedPoints[i].PointOnLine.ToString());
                            }
                            break;
...