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New unit utility to auto detect SI unit dimensional exponents

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This commit is contained in:
Dion Moult
2021-08-06 12:38:34 +10:00
parent 7d087d2919
commit 4ccadc4f36
1 changed files with 38 additions and 0 deletions
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src/ifcopenshell-python/ifcopenshell/util/unit.py
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@@ -52,6 +52,40 @@ unit_names = [
"WEBER",
]
si_dimensions = {
"METRE": (1, 0, 0, 0, 0, 0, 0),
"SQUARE_METRE": (2, 0, 0, 0, 0, 0, 0),
"CUBIC_METRE": (3, 0, 0, 0, 0, 0, 0),
"GRAM": (0, 1, 0, 0, 0, 0, 0),
"SECOND": (0, 0, 1, 0, 0, 0, 0),
"AMPERE": (0, 0, 0, 1, 0, 0, 0),
"KELVIN": (0, 0, 0, 0, 1, 0, 0),
"MOLE": (0, 0, 0, 0, 0, 1, 0),
"CANDELA": (0, 0, 0, 0, 0, 0, 1),
"RADIAN": (0, 0, 0, 0, 0, 0, 0),
"STERADIAN": (0, 0, 0, 0, 0, 0, 0),
"HERTZ": (0, 0, -1, 0, 0, 0, 0),
"NEWTON": (1, 1, -2, 0, 0, 0, 0),
"PASCAL": (-1, 1, -2, 0, 0, 0, 0),
"JOULE": (2, 1, -2, 0, 0, 0, 0),
"WATT": (2, 1, -3, 0, 0, 0, 0),
"COULOMB": (0, 0, 1, 1, 0, 0, 0),
"VOLT": (2, 1, -3, -1, 0, 0, 0),
"FARAD": (-2, -1, 4, 2, 0, 0, 0),
"OHM": (2, 1, -3, -2, 0, 0, 0),
"SIEMENS": (-2, -1, 3, 2, 0, 0, 0),
"WEBER": (2, 1, -2, -1, 0, 0, 0),
"TESLA": (0, 1, -2, -1, 0, 0, 0),
"HENRY": (2, 1, -2, -2, 0, 0, 0),
"DEGREE_CELSIUS": (0, 0, 0, 0, 1, 0, 0),
"LUMEN": (0, 0, 0, 0, 0, 0, 1),
"LUX": (-2, 0, 0, 0, 0, 0, 1),
"BECQUEREL": (0, 0, -1, 0, 0, 0, 0),
"GRAY": (2, 0, -2, 0, 0, 0, 0),
"SIEVERT": (2, 0, -2, 0, 0, 0, 0),
"OTHERWISE": (0, 0, 0, 0, 0, 0, 0)
}
si_conversions = {
"inch": 0.0254,
"foot": 0.3048,
@@ -110,6 +144,10 @@ def get_unit_name(text):
return name
def get_si_dimensions(name):
return si_dimensions.get(name, si_dimensions["OTHERWISE"])
def convert(value, from_prefix, from_unit, to_prefix, to_unit):
"""Converts between length, area, and volume units