topic Re: Selecting elements with Python in Archicad Python API

Selecting elements with Python

Anonymous — Tue, 14 Sep 2021 11:34:47 GMT

Hey,
is there an easy way to get all Zone elements in the same classification system or all walls in the same branch?

Re: Selecting elements with Python

poco2013 — Tue, 19 Jan 2021 05:45:09 GMT

You can get the wall and zone elements by using the function: GetElementsByType(Zone or Wall)
Use GetClassificationsOfElements() to get the classifications of each of the above elements.

You will then have to iterate through the list to isolate the elements with the desired classification.

There is no direct method but the above is only a few lines

Re: Selecting elements with Python

Boling1 — Tue, 19 Jan 2021 08:33:47 GMT

I guess code like this:
------------------------------------------------------------------------

from archicad import ACConnection
conn = ACConnection.connect()       #连接AC Application对象
assert conn
acc = conn.commands                 #赋值acc为AC的commands命令对象
act = conn.types                    #赋值act为AC的types类型对象
acu = conn.utilities                #赋值act为AC的utility实用工具对象

lstElements1 = acc.GetElementsByType("Zone")
and then? how to use GetClassificationsOfElements,can you give a code example?
like foreach item in lstElements1 :

.....
......

Re: Selecting elements with Python

poco2013 — Tue, 19 Jan 2021 14:23:34 GMT

Sorry -- Picked the wrong function!!

space_classification_item = acu.FindClassificationItemInSystem( 'ARCHICAD Classification', 'Space')

element_ids = acc.GetElementsByClassification(space_classification_item.classificationItemId)
print(element_ids)

Once you have your element list, you can iterate through to find the element with the properties you want or match them to a specific element type?

Re: Selecting elements with Python

Anonymous — Tue, 19 Jan 2021 17:08:50 GMT

It is possible to find just elements with Archicad Classification (root system)?

Re: Selecting elements with Python

poco2013 — Tue, 19 Jan 2021 18:12:33 GMT

You are not clear as to what information you want based on classification? Are you seeking a list of element identifiers (guid), ids (names) ,or types, etc.?

The Archicad classification system is a tree structure with a root (system) name at the top and a item id (s) which may be branches, sub-branches or leaves.

Elements are classified based on the classification system name (root) and a item id which could be a branch, sub-branch or leaf name. You need both names (system & item) to retrieve a element Id. This is because there can be several different classification systems in Archicad with duplicate item names between each. How you retrieve a element depends on how it was classified in the "classifications and Properties" Tab. Elements can be classified at any level and by multiple class system structures.

Using: "GetElementsByClassification" returns a list of elements (guids) that have that classification.You then can use other functions to find or sort through the properties of each element.

Re: Selecting elements with Python

Boling1 — Fri, 22 Jan 2021 09:13:45 GMT

sorry I'm new in Python, I runned

space_classification_item = acu.FindClassificationItemInSystem( "ARCHICAD Classification", "Wall")

and the result is :

Exception has occurred: StopIteration
File "C:\software\Python\Excel file exporter\toExcel-1.py", line 27, in <module>
space_classification_item = acu.FindClassificationItemInSystem("RCHICAD Classification", "Wall")

1>"ARCHICAD Classification" 'ARCHICAD Classification' which is right?
2>Wall Column Beam Window Door Object Lamp Slab Roof Mesh Zone CurtainWall Shell Skylight Morph Stair Railing Opening, I don't know what "Space" means?
3>Can you give a whole code, if I can run that code, I can get what you mean.

thx a lot

Re: Selecting elements with Python

poco2013 — Fri, 22 Jan 2021 12:56:31 GMT

You are not clear as to what information you want based on classification? Are you seeking a list of element identifiers (guid), ids (names) ,or types, etc.? What information do you want to do what?

Re: Selecting elements with Python

Boling1 — Tue, 26 Jan 2021 13:49:24 GMT

I just want to takeoff all walls's area,thickness,story_number,building_material,How can I do by python?

Re: Selecting elements with Python

poco2013 — Tue, 26 Jan 2021 16:01:37 GMT

You might start by reviewing the videos and examples on Graphisoft's Python site.

For wall properties, the procedure is to obtain the IDs of both the element (wall) and the property, then use the Get Value function to obtain the property value. Story level and Building Material are not directly available but can be obtained by making a custom expression property referencing those properties, Then reference the custom properties.

The examples illustrate this.

Re: Selecting elements with Python

Boling1 — Thu, 28 Jan 2021 06:58:09 GMT

I have read all the phthon examples,but I can't find any info about story_namber and building_material,can you figer out which example I should read carefully?
thx a lot

Re: Selecting elements with Python

JSN — Tue, 02 Feb 2021 12:46:32 GMT

poco2013 wrote:
Sorry -- Picked the wrong function!!
space_classification_item = acu.FindClassificationItemInSystem( 'ARCHICAD Classification', 'Space')

element_ids = acc.GetElementsByClassification(space_classification_item.classificationItemId)
print(element_ids)
Once you have your element list, you can iterate through to find the element with the properties you want or match them to a specific element type?

Hi, just curious if you have already tried to SetClassificationsOfElements, as this somehow tricking me at the moment. It requires the list of ElementClassification but I somehow don't get it right. Any help is appreciated!

Re: Selecting elements with Python

poco2013 — Tue, 02 Feb 2021 15:13:03 GMT

Might be a easier way:

elements = acc.GetElementsByType('Object')
top_class = acu.FindClassificationSystem('ARCHICAD Classification')
item_class = acu.FindClassificationItemInSystem('ARCHICAD Classification','System Furniture')
class_id = act.ClassificationId(top_class,item_class.classificationItemId)
elem_classes = []
for element in elements:
    elem_class = act.ElementClassification(element.elementId,class_id)
    elem_classes.append(elem_class)
acc.SetClassificationsOfElements(elem_classes)

Re: Selecting elements with Python

JSN — Tue, 02 Feb 2021 17:03:29 GMT

poco2013 wrote:
Might be a easier way:

Thx, structuring the class hierarchy helps. I will dig deeper and see where I get with this!

Re: Selecting elements with Python

noriksaroyan — Thu, 16 Mar 2023 15:11:26 GMT

can you please provide the website? I can't find videos on https://graphisoft.com/downloads/python

Re: Selecting elements with Python

Mathias Jonathan — Thu, 16 Mar 2023 15:24:20 GMT

The link to the videos are in the PDF of each script examples.

NB: I made a little introduction to the archicad/python connection here if you are a beginner on the subject: https://community.graphisoft.com/t5/Developer-forum/PYTHON-Introduction-to-the-Archicad-Python-connection/td-p/371839

Re: Selecting elements with Python

noriksaroyan — Thu, 16 Mar 2023 16:33:06 GMT

Thank you, Mathias.

I have another question here: https://community.graphisoft.com/t5/Developer-forum/Getting-all-property-values-of-type-Door-from-Archicad-26/td-p/373353

would appreciate any kind of help))