This question came in as a blog comment on this previous post:
Is possible to use Revision Cloud in this situation? Example: Creating a polyline/circle/ellipse then make it a revision cloud.
It seemed to make sense to broaden the topic for the purposes of this blog post: how to pass an entity or entities to an AutoCAD command called via Editor.Command() or CommandAsync().
Since Editor.Command() was implemented in AutoCAD 2015, I've been a fan of the calling commands in AutoCAD application code. But I haven't actually covered the approach needed to send object information to commands via this function. Yes, you can always use the "_LAST" keyword during entity selection, but how else can it be done?
Here's some C# code that shows how to use the SelectionSet object to send one or more entities to a command:
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
namespace CallingCommands
{
public class Commands
{
[CommandMethod("CB")]
public void CreateBlock()
{
var doc = Application.DocumentManager.MdiActiveDocument;
if (doc == null)
return;
var db = doc.Database;
var ed = doc.Editor;
var ids = new ObjectIdCollection();
// Create the geometry for our block using the AutoCAD .NET API
using (var tr = db.TransactionManager.StartTransaction())
{
var ms =
tr.GetObject(
SymbolUtilityServices.GetBlockModelSpaceId(db),
OpenMode.ForWrite
) as BlockTableRecord;
if (ms != null)
{
// We'll have two diagonal lines with a circle
var ln1 = new Line(new Point3d(0, 0, 0), new Point3d(10, 10, 0));
var ln2 = new Line(new Point3d(0, 10, 0), new Point3d(10, 0, 0));
var c = new Circle(new Point3d(5, 5, 0), Vector3d.ZAxis, 5);
ids.Add(ms.AppendEntity(ln1));
ids.Add(ms.AppendEntity(ln2));
ids.Add(ms.AppendEntity(c));
tr.AddNewlyCreatedDBObject(ln1, true);
tr.AddNewlyCreatedDBObject(ln2, true);
tr.AddNewlyCreatedDBObject(c, true);
}
tr.Commit();
// Add the ObjectIds of our geometry to a SelectionSet
var ida = new ObjectId[ids.Count];
ids.CopyTo(ida, 0);
var ss = SelectionSet.FromObjectIds(ida);
// Create the block and insert it using sta
ndard commands
ed.Command("_.-BLOCK", "TEST", "0,0", ss, "");
ed.Command("_.-INSERT", "TEST", "0,0", 1, 1, 0);
}
}
[CommandMethod("RC")]
public void RevCloud()
{
var doc = Application.DocumentManager.MdiActiveDocument;
if (doc == null)
return;
var db = doc.Database;
var ed = doc.Editor;
using (var tr = db.TransactionManager.StartTransaction())
{
var ms =
tr.GetObject(
SymbolUtilityServices.GetBlockModelSpaceId(db),
OpenMode.ForWrite
) as BlockTableRecord;
if (ms != null)
{
// Create our polyline boundary
var pl = new Polyline();
pl.AddVertexAt(0, new Point2d(0, 0), 0, 0, 0);
pl.AddVertexAt(1, new Point2d(10, 0), 0, 0, 0);
pl.AddVertexAt(2, new Point2d(10, 10), 0, 0, 0);
pl.AddVertexAt(3, new Point2d(0, 10), 0, 0, 0);
pl.Closed = true;
// Add it to the drawing
var id = ms.AppendEntity(pl);
tr.AddNewlyCreatedDBObject(pl, true);
// Create a SelectionSet and use it to call the REVCLOUD command
var ss = SelectionSet.FromObjectIds(new ObjectId[] { id });
ed.Command("_.REVCLOUD", "", ss, "");
}
tr.Commit();
}
}
}
}
The first command, CB, creates a block of three pieces of geometry and then inserts it in the drawing. The geometry is created using .NET and the block is created and inserted using the BLOCK and INSERT commands. We could, of course, use the .NET API to define and insert the block, too: the point is that you can use a SelectionSet object to pass sets of objects – irrespective of how they have been created – to standard commands, as needed.
The second command, RC, creates a revision cloud from a polyline. This shows using a SelectionSet of a single object to respond to an Editor.GetEntity() or (entsel) prompt (i.e. one that asks for one entity rather than a set of multiple entities). In this case we're calling the REVCLOUD command right there inside the transaction, basically to show that it doesn't really matter where we call the command as long as the passed entities are already database-resident. Which they must be to have an ObjectId, of course.
Here are the two commands in action:
Finally, here's a quick shout out to one of our Expert Elites, Gilles Chanteau, for all his help on both the Autodesk forums and The Swamp. I'm always very impressed by the quality of answers Gilles provides to people, and posts such as this one will no doubt have been a great help to people already searching for this information. Ke
ep it up, Gilles!
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