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Sorry, I confused MLeader with Leader
Did you try defining the MLeader geometry (Line and Vertices) before stting its contents:
var leader = new MLeader(); leader.SetDatabaseDefaults(); leader.AddLeader(); leader.AddLeaderLine(0); leader.AddFirstVertex(0, startPoint); leader.AddLastVertex(0, endPoint); leader.ContentType = ContentType.BlockContent; leader.BlockContentId = bt["Box"];
I do not undestand what you mean with "builtin block Box".
If the block "Box" isn't already in the drawing block table, you have to add it.
If the block exists as "Box.dwg" file in some place you know, you can add it to the block table using the Database.Insert() method with the hard coded path.
You can also try to find the "Block.dwg" file in the search paths with HostApplicationServices.FindFile() method.
These methods will fail if the block isn't found.
Another way which will never fail is to create the block table record "on the fly".
Here's a litlle sample which shows these different ways
// check if the "Box" block already exists in the block table
if (blockTable.Has("Box"))
{
blockId = blockTable["Box"];
}
else
{
// try to get "Box.dwg" from a known location
if (System.IO.File.Exists(@"F:\Block files\Box.dwg"))
{
// add the block to the block table
blockTable.UpgradeOpen();
using (var sourceDb = new Database())
{
sourceDb.ReadDwgFile(@"F:\Block files\Box.dwg", System.IO.FileShare.Read, false, null);
blockId = db.Insert("Box", sourceDb, true);
}
}
else
{
// try to find "Box.dwg" in the search paths
try
{
string blockPath = HostApplicationServices.Current.FindFile("Box.dwg", db, FindFileHint.Default);
// add the block to the block table
blockTable.UpgradeOpen();
using (var sourceDb = new Database())
{
sourceDb.ReadDwgFile(blockPath, System.IO.FileShare.Read, false, null);
blockId = db.Insert("Box", sourceDb, true);
}
}
// or build the block
catch
{
// create a new BlockTableRecord and add it to the bloc table
var btr = new BlockTableRecord();
btr.Name = "Box";
blockTable.UpgradeOpen();
blockId = blockTable.Add(btr);
tr.AddNewlyCreatedDBObject(btr, true);
// add some entities to the newly created BlockTableRecord
var circle = new Circle(Point3d.Origin, Vector3d.ZAxis, 2.0);
btr.AppendEntity(circle);
tr.AddNewlyCreatedDBObject(circle, true);
var pline = new Polyline(4);
pline.AddVertexAt(0, new Point2d(-2.0, -2.0), 0.0, 0.0, 0.0);
pline.AddVertexAt(1, new Point2d(2.0, -2.0), 0.0, 0.0, 0.0);
pline.AddVertexAt(2, new Point2d(2.0, 2.0), 0.0, 0.0, 0.0);
pline.AddVertexAt(3, new Point2d(-2.0, 2.0), 0.0, 0.0, 0.0);
pline.Closed = true;
btr.AppendEntity(pline);
tr.AddNewlyCreatedDBObject(pline, true);
}
}
}
The block you're looking for is named "_TagBox" (or "_TagCircle").
It seems to me these blocks do not already exist in AutoCAD resources and are created "on the fly" when needed.
I didn't find any other way to get them than using the MLeaderStyle dialog.
Anyway, you can do the same as AutoCAD and create you own block "on the fly" the first time you call the method and get it from the block table every next times.
using System;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using AcAp = Autodesk.AutoCAD.ApplicationServices.Application;
[assembly: CommandClass(typeof(MLeaderSample.CommandMethods))]
namespace MLeaderSample
{
public class CommandMethods
{
[CommandMethod("MLDR", CommandFlags.Modal)]
public void MakeMleader()
{
var doc = AcAp.DocumentManager.MdiActiveDocument;
var db = doc.Database;
var ed = doc.Editor;
var opts = new PromptPointOptions("\nStart point: ");
var ppr = ed.GetPoint(opts);
if (ppr.Status != PromptStatus.OK)
return;
var startPoint = ppr.Value;
opts.Message = "\nEnd point: ";
opts.BasePoint = startPoint;
opts.UseBasePoint = true;
ppr = ed.GetPoint(opts);
if (ppr.Status != PromptStatus.OK)
return;
var endPoint = ppr.Value;
var ucsMat = ed.CurrentUserCoordinateSystem;
var ucs = ucsMat.CoordinateSystem3d;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
var blockTable = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
ObjectId blockId, attDefId = ObjectId.Null;
if (blockTable.Has("_Bubble"))
{
blockId = blockTable["_Bubble"];
var btr = (BlockTableRecord)tr.GetObject(blockId, OpenMode.ForRead);
if (!btr.HasAttributeDefinitions)
{
ed.WriteMessage("\nWrong '_Bubble' block (none attribute).");
return;
}
foreach (var id in btr)
{
if (id.ObjectClass == RXClass.GetClass(typeof(AttributeDefinition)))
{
attDefId = id;
break;
}
}
}
else
{
var btr = new BlockTableRecord();
btr.Name = "_Bubble";
blockTable.UpgradeOpen();
blockId = blockTable.Add(btr);
tr.AddNewlyCreatedDBObject(btr, true);
var circle = new Circle(Point3d.Origin, Vector3d.ZAxis, 4.0);
btr.AppendEntity(circle);
tr.AddNewlyCreatedDBObject(circle, true);
var attrib = new AttributeDefinition(
Point3d.Origin,
"NUMBERTAG",
"NUMBERTAG",
"Enter the tag number.",
db.Textstyle
);
attrib.Height = 3.0;
attrib.Justify = AttachmentPoint.MiddleCenter;
attrib.AlignmentPoint = Point3d.Origin;
attDefId = btr.AppendEntity(attrib);
tr.AddNewlyCreatedDBObject(attrib, true);
}
var mspace = (BlockTableRecord)tr.GetObject(
blockTable[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
var leader = new MLeader();
leader.SetDatabaseDefaults();
leader.AddLeader();
leader.AddLeaderLine(0);
leader.AddFirstVertex(0, startPoint);
leader.AddLastVertex(0, endPoint);
leader.SetDoglegLength(0, 4.0);
leader.ContentType = ContentType.BlockContent;
leader.BlockContentId = blockId;
if (endPoint.X < startPoint.X)
{
var disp = leader.BlockPosition.GetVectorTo(endPoint) * 2.0;
leader.MoveMLeader(disp, MoveType.MoveAllExceptArrowHeaderPoints);
}
leader.TransformBy(ucsMat);
mspace.AppendEntity(leader);
tr.AddNewlyCreatedDBObject(leader, true);
db.TransactionManager.QueueForGraphicsFlush();
var pr = ed.GetString("\nEnter the tag number: ");
if (pr.Status == PromptStatus.OK)
{
var attDef = (AttributeDefinition)tr.GetObject(attDefId, OpenMode.ForRead);
var attRef = new AttributeReference();
attRef.SetAttributeFromBlock(attDef, Matrix3d.Identity);
attRef.TextString = pr.StringResult;
leader.SetBlockAttribute(attDefId, attRef);
}
tr.Commit();
}
}
}
}
