civstation

Overview

Provides a Station object, which represents a Station of the kind found in civil plans of roads and other linear features, where 5+10 for example represents a point 510 feet (or meters or any units) from an arbitrary starting point.

Station objects

Import the Station class:

from civstation import Station

Create a station object:

sta = Station("4+56.78")

Stations can also be made from a number, which will convert it to a Station.

>>>sta = Station(456.78)
>>>print (sta)
4+56.78

Stations can also be made from a Station, for ease of implementation.

Stations default to displaying two decimal places with trailing zeros. This can be changed by setting decimal_places to the desired number.

>>>sta = Station(456.78, decimal_places = 4)
>>>print(sta)
4+56.7800

Offset Objects

Offset objects work similarly to Stations, but represent a deviation to the left or right from the line that the Station refers to.

Right (RT) is positive and Left (LT) is negative.

>>> offset1=Offset("86.47LT")
>>> offset2=Offset("-86.47")
>>> offset1
86.47LT
>>> offset2
86.47LT

Point Objects

Point objects represent a point on a 2D plane, where the x and y coordinates are a Station and an Offset.

Operations

Stations and Offsets can be added, subtracted, and compared.

Two Points can be subtracted, returning a straight-line distance between them.

Adding a station and a number (float, int, etc.) returns a Station.

Subtracting a number from a station returns a Station.

Subtracting a a Station from a Station returns a float. This is because stations represent a position along a line. Subtracting two stations produces a distance not a position, best represented as a float, not a Station. However, this behavior can be overridden by setting return_float_on_sub = False, to work completely in Stations.

There doesn't appear to be a good reason to multiply or divide Stations, so it is not supported. If this is necessary, convert them to floats or another suitable type.

Definition of Station object

The following code shows the args taken by a Station object.

class Station:
    def __init__(self, sta, decimal_places = 2, return_float_on_sub = True) -> None: