TraceBoundary is not work with an ellipse or a spline.
Hi,
With a closed ellipse or spline TraceBoundary should generate a Region (a polyline can only be constitued of lines and arcs).
This little snippet works for me:
[CommandMethod("TEST")]
public static void Test()
{
var ed = Application.DocumentManager.MdiActiveDocument.Editor;
var pointResult = ed.GetPoint("\nPick a point: ");
var bound = ed.TraceBoundary(pointResult.Value, false);
if (0 < bound.Count)
{
Application.ShowAlertDialog(bound[0].GetType().Name);
foreach (DBObject item in bound)
{
item.Dispose();
}
}
else
{
Application.ShowAlertDialog("None boundary");
}
}
The code I posted work with your drawing as the following one.
Your issue may be due to the context you call your method or a corrupted AutoCAD installation.
What happens when you call the call the _BOUNDARY command in the test_01.dwg drawing?
[CommandMethod("TEST")]
public static void Test()
{
var doc = Application.DocumentManager.MdiActiveDocument;
var db = doc.Database;
var ed = doc.Editor;
var pointResult = ed.GetPoint("\nPick a point: ");
var bound = ed.TraceBoundary(pointResult.Value, true);
if (0 < bound.Count)
{
using (var tr = db.TransactionManager.StartTransaction())
{
var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
foreach (DBObject obj in bound)
{
var ent = (Entity)obj;
ent.ColorIndex = 1;
curSpace.AppendEntity(ent);
tr.AddNewlyCreatedDBObject(ent, true);
Application.ShowAlertDialog($"One {obj.GetType().Name} created");
}
tr.Commit();
}
}
else
{
Application.ShowAlertDialog("None boundary");
}
}The Editor.TraceBoundary methods works in the document context.
A modeless UI runs in application context.
As said Kean Walmsley in his blog:
"Once again there’s our important rule of thumb when it comes to implementing a modeless UI: rather than manually locking the current document, it’s safer to define a command – which will implicitly lock the current document – and call that from the UI via SendStringToExecute()."
So, you should wrap the using of TraceBoundary within a command method and call this command with SenStringToExecute from your button event handler so that AutoCAD takes care of switching in document context and locking the document.
Another way to switch to the document context is to prompt the user within the button event handler, but in this case, you're responsible to lock the document (before calling TraceBoundary).
Command side:
[CommandMethod("DLG", CommandFlags.Modal)]
public static void ShowDialog()
{
var dlg = new Dialog1();
Application.ShowModelessDialog(null, dlg, false);
}Dialog side:
private void button1_Click(object sender, EventArgs e)
{
var doc = AcAp.DocumentManager.MdiActiveDocument;
if (doc == null) return;
var ed = doc.Editor;
doc.Window.Focus();
var pointResult = ed.GetPoint("\nPick a point: "); // <- switch to document context
if (pointResult.Status != Autodesk.AutoCAD.EditorInput.PromptStatus.OK) return;
using (doc.LockDocument())
{
var bound = ed.TraceBoundary(pointResult.Value, true);
if (0 < bound.Count)
{
var db = doc.Database;
using (var tr = db.TransactionManager.StartTransaction())
{
var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
foreach (DBObject obj in bound)
{
var ent = (Entity)obj;
ent.ColorIndex = 1;
curSpace.AppendEntity(ent);
tr.AddNewlyCreatedDBObject(ent, true);
}
tr.Commit();
}
}
}
}
Even in this case, the more robust way is not more complex and allow to recall the last command by hiting enter.
Command side:
[CommandMethod("DLG", CommandFlags.Modal)]
public static void ShowDialog()
{
var dlg = new Dialog1();
Application.ShowModelessDialog(null, dlg, false);
}
[CommandMethod("DRAWBOUND")]
public static void DrawBoundary()
{
var doc = Application.DocumentManager.MdiActiveDocument;
var ed = doc.Editor;
var pointResult = ed.GetPoint("\nPick a point: ");
if (pointResult.Status != PromptStatus.OK) return;
var bound = ed.TraceBoundary(pointResult.Value, true);
if (0 < bound.Count)
{
var db = doc.Database;
using (var tr = db.TransactionManager.StartTransaction())
{
var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
foreach (DBObject obj in bound)
{
var ent = (Entity)obj;
ent.ColorIndex = 1;
curSpace.AppendEntity(ent);
tr.AddNewlyCreatedDBObject(ent, true);
}
tr.Commit();
}
}
}Dialog side:
private void button2_Click(object sender, EventArgs e)
{
var doc = AcAp.DocumentManager.MdiActiveDocument;
if (doc == null) return;
doc.Window.Focus();
doc.SendStringToExecute("DRAWBOUND\n", false, false, false); // <- switch to document context
}
