Function for stationing (chainage)

Rick_Brice

Is there a function somewhere in the IfcOpenShell or Bonsai ecosystem that can create a stationing string for labels and such?

Example: station_value = 1234.56
String (US): 12+34.56
String (SI): 1+234.56

Moult

Im not aware of any. How does it work? We've got code that uses Lark for a variety of input parsing and unit conversion that this might be similar to.

Rick_Brice

Let’s say Pset_Stationing has a Station property of 1234.56. It’s meaningful for IfcReferent.Name/Description to include the station. Stations are represented as (full chains)+(links).(link fraction)

A surveyor chain is 100ft long made up of 100-1ft links.

The example station is 12 chains + 34.56 links, or 12+34.56

IfcReferent.Name=“PC 12+34.56”

I have some C++ code I can port to python and add it to IfcOpenShell.api.alignment

Rick_Brice

Here is an example using stationing format in Excel
https://excelevangelist.blogspot.com/2012/10/engineering-stationing-custom-format.html

steverugi

@Rick_Brice

Here is an example using stationing format in Excel
https://excelevangelist.blogspot.com/2012/10/engineering-stationing-custom-format.html

If I understand your request:
we use the same prodedure to convert m to chainage (24,452.89 > 24+452.89) in Excel without affecting the value
in python should be something like

meters = 123498
km = meters//1000
m = meters % 1000
print( f"{km}+{m}")

123+498
I think REGEX can be used too

Rick_Brice

In recently add this in ifcopenshell.util.stationing. The function is station_as_string. Input a value, and optionally the number of digits between the + and the ., as well as number of decimal points, and it returns a stringized version of the station value.

s = ifcopenshell.util.stationing.station_as_string(123456.789,2,2)
print(s)
‘1234+56.79’