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NamingRuleForUserInterface.md

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Naming Rule for User Interface

Overview

This document describes the naming rule for user interface layer which includes parameters in initialize files and variable names in CSV log files. Since users directly access to the values, we need to care the readability more than the name of variables in codes.

Common rules

  • The names has following structure
    • Scalar values: [name]_[unit]
    • Vector or matrix values: [name]_[frame]_[unit]
    • If the value has no unit, we can remove the [unit] information.
  • Variable name field: [name]
    • It should be written as snake_case.
    • Single character abbreviations are prohibited.
      • Examples: q = quaternion, v = velocity are prohibited.
    • We do not recommend to use unfamiliar abbreviations.
      • Examples: pos = position, quat = quaternion are not recommended.
    • Available abbreviations are decided during review processes.
  • Unit field: [unit]
    • For readability, we recommend to use general unit description in the SI unit system, and we do not need to follow the snake_case description in the unit field.
    • Examples: Nm, rad/s, m/s2, degC
  • Frames
    • For readability, we recommend to use the following abbreviation in the unit field. When new abbreviation is needed for the frame description, please add it into the following list.
      • i: Inertial frame
      • b: Body fixed frame
      • c: Component fixed frame
      • ecef: Earth Centered Earth Fixed frame
      • lvlh: Local Vertical Local Horizontal
      • rtn: Radial-Transverse-Normal
    • To express the frame conversion, we can use i2b as frame conversion from the inertial frame to the body-fixed frame.
    • Note: The definition of origin of inertial frame is defined by the user settings. So sometimes we cannot use eci = Earth Centered Inertial.
    • The axis of the frame is described as i_x, i_y, i_z.

Initialize files

  • S2E uses INI format initialize files.
  • INI has Section and key fields as follows 
    [SECTION]
key = value
  • The SECTION field should be written as SNAKE_CASE
  • The key fields should be written to follow the above Common rules.
  • The axis of the frame is described as (0), (1), (2), and they mean X, Y, Z
    • For quaternion (0), (1), (2), (3) is used as X, Y, Z, W.
    • TODO: Modify to use X, Y, Z directory?

CSV log files

  • S2E generates CSV format log files.
  • The output file has the variable names in the first rows.
  • The variable names should be written to follow the above Common rules.
  • The unit is written in the brackets [ ] as [N]