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Fix #1795. New support for conversion based units with offsets, like fahrenheit.

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This commit is contained in:
Dion Moult
2021-10-14 12:46:01 +11:00
parent 1fa1a9e3d3
commit 3d0d2ec8fb
3 changed files with 63 additions and 18 deletions
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src/ifcopenshell-python/ifcopenshell/api/unit/add_conversion_based_unit.py
+14 -18
View File
@@ -5,33 +5,29 @@ import ifcopenshell.util.unit
class Usecase:
def __init__(self, file, **settings):
self.file = file
self.settings = {"unit_type": "LENGTHUNIT", "name": "METRE", "prefix": None, "conversion_offset": None}
self.settings = {"name": "foot", "conversion_offset": None}
for key, value in settings.items():
self.settings[key] = value
def execute(self):
if self.settings["unit_type"] == "LENGTHUNIT":
dimensional_exponents = self.file.createIfcDimensionalExponents(1, 0, 0, 0, 0, 0, 0)
si_unit = self.file.createIfcSIUnit(UnitType=self.settings["unit_type"], Name="METRE")
elif self.settings["unit_type"] == "AREAUNIT":
dimensional_exponents = self.file.createIfcDimensionalExponents(2, 0, 0, 0, 0, 0, 0)
si_unit = self.file.createIfcSIUnit(UnitType=self.settings["unit_type"], Name="SQUARE_METRE")
elif self.settings["unit_type"] == "VOLUMEUNIT":
dimensional_exponents = self.file.createIfcDimensionalExponents(3, 0, 0, 0, 0, 0, 0)
si_unit = self.file.createIfcSIUnit(UnitType=self.settings["unit_type"], Name="CUBIC_METRE")
unit_type = ifcopenshell.util.unit.imperial_types.get(self.settings["name"], "USERDEFINED")
dimensions = ifcopenshell.util.unit.named_dimensions[unit_type]
exponents = self.file.createIfcDimensionalExponents(*dimensions)
si_name = ifcopenshell.util.unit.si_type_names[unit_type]
si_unit = self.file.createIfcSIUnit(UnitType=unit_type, Name=si_name)
conversion_real = ifcopenshell.util.unit.si_conversions.get(self.settings["name"], 1)
value_component = self.file.create_entity("IfcReal", **{"wrappedValue": conversion_real})
conversion_factor = self.file.createIfcMeasureWithUnit(value_component, si_unit)
if self.settings["conversion_offset"]:
return self.file.createIfcConversionBasedUnit(
dimensional_exponents,
self.settings["unit_type"],
self.settings["name"],
conversion_factor,
self.settings["conversion_offset"],
conversion_offset = self.settings["conversion_offset"]
if not conversion_offset:
conversion_offset = ifcopenshell.util.unit.si_offsets.get(self.settings["name"], 0)
if conversion_offset:
return self.file.createIfcConversionBasedUnitWithOffset(
exponents, unit_type, self.settings["name"], conversion_factor, conversion_offset,
)
return self.file.createIfcConversionBasedUnit(
dimensional_exponents, self.settings["unit_type"], self.settings["name"], conversion_factor
exponents, unit_type, self.settings["name"], conversion_factor
)
src/ifcopenshell-python/ifcopenshell/util/unit.py
+6
View File
@@ -192,9 +192,14 @@ si_conversions = {
"hour": 3600,
"day": 86400,
"btu": 1055.056,
"fahrenheit": 1.8,
}
si_offsets = {
"fahrenheit": -459.67,
}
imperial_types = {
"thou": "LENGTHUNIT",
@@ -233,6 +238,7 @@ imperial_types = {
"hour": "TIMEUNIT",
"day": "TIMEUNIT",
"btu": "ENERGYUNIT",
"fahrenheit": "THERMODYNAMICTEMPERATUREUNIT",
}