Python Node for Mleader Arrowhead Coordinates

Civil3D
,
1

Hello!

I’m hoping to create a python node that outputs the arrowhead coordinates of selected mleaders. Is this possible?

2

Have you checked the Camber nodes? In any case here is the API for MLeader: Help

I don’t use them much so I dont know if the Block position will correspond to the arrowhead coordinates. I will say that it depends what the insertion point is for block but will expect it to be something like the arrowhead.

image
image412×531 22.6 KB

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3

I did, sadly the BlockPosition node gets the position of content block (like a hex tag) instead of the leader arrowhead position.

You can write a lisp routine to get leader head location per the Autodesk Forum.

I assume you can do the same in Dynamo and the documentation states that a Leader.FirstVertex Property exists for a leader, but my attempts to make a python node to obtain the first vertex point have failed so far.

4

Can you share those attempts?

5

You bet! See my test script attached.

Mleader Arrowhead Point.dyn (6.3 KB)

6

Presuming you would select an object with the Dynamo Select Object node you can get the vertex via Dynamo with the following:

def get_selected_leader(dyn_object):
	with adoc.LockDocument():
		with adoc.Database as db:
		
			with db.TransactionManager.StartTransaction() as t:
			
				res = None
				
				if isinstance(dyn_object.InternalDBObject, MLeader):
					obj = t.GetObject(dyn_object.InternalObjectId, OpenMode.ForRead)
					res = obj.GetFirstVertex(0) #get First vertex of first leader of the multileader
		
	return res
	
OUT = get_selected_leader(IN[0])

you also might want to go for all leaders:

def get_all_leaders():
	with adoc.LockDocument():
	    with adoc.Database as db:
	
	        with db.TransactionManager.StartTransaction() as t:
	            
	            bt = t.GetObject(db.BlockTableId,OpenMode.ForRead)
	            btr = t.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForRead)
	            
	            lst = []
	            for oid in btr:
	            	if oid.ObjectClass.Name == "AcDbMLeader":
	            		obj = t.GetObject(oid, OpenMode.ForRead)
	            		lst.append(obj.GetFirstVertex(0)) #get First vertex of first leader of the multileader
            pass
	return lst

OUT = get_all_leaders()

Output is a Point3d type (AutoCAD). You might want to convert output to DS point:

clr.AddReference('ProtoGeometry')
import Autodesk.DesignScript.Geometry as DS
point3d = get_selected_leader(IN[0])
ds_point = DS.Point.ByCoordinates(point3d[0],point3d[1],point3d[2])
OUT = ds_point
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7

@mparks8G2XN I added a new node to Camber for you. I’ll try to get the new version out soon.

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8

Awesome mzjensen! Thanks everyone for the help!

9

A post was merged into an existing topic: Camber Feedback Thread

10

@mparks8G2XN this is available in v4.2.0.

leader_points
leader_points308×178 5.77 KB

3 Likes
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This new MLeader.LeaderPoints node v4.2.0 is exactly what I’m looking for! Thank you @zachri.jensen!

13

Hi @zachri.jensen,

I’m using the MLeader.LeaderPoints node but I’m not sure which node to input into it. When I use select objects, it reads this…

image

1 Like
14

You’ll need a Convert to Camber Object node first.

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15

Thanks!

16

Is there a scaling issue with this node? It seems to not work with larger coordinate systems…(3 mil)

17

Do you have Dynamo’s geometry scaling set to Medium?