Data Trees read-only?

I want to make a series of transformations to a DataTree which was created inside a VB component (iteratively adding vectors to initial points).

Once it's created with the initial points, however, any attempts to change the value returns:

Error: Property 'Item' is 'ReadOnly'. (line xxx)

I'm using: myTree(path, index)+=xVector

is there a way of rewriting datatrees?

Replies to This Discussion

Permalink Reply by David Rutten on March 8, 2011 at 9:02am

Hi Trevor,

Item is indeed a ReadOnly property. I can't for the life of me remember why I did this, though it's probably to do with setting values that don't exist. Anyway, It's easy enough to throw an exception when you do this so I'll make the item accessor Read/Write for the next release. In the meantime:

For p As Int32 = 0 To pts.BranchCount - 1

Dim branch As List(Of Point3d) = pts.Branch(p)

For i As Int32 = 0 To branch.Count - 1

branch(i) += Vector3d.ZAxis

Next

A = pts

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by David Rutten on March 8, 2011 at 9:15am

So, starting with the next release you should be able to write:

For i As int32 = 0 To 6