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This commit is contained in:
Thomas Krijnen
2026-07-03 12:14:15 +02:00
parent a54a8b80d3
commit 55e97e5379
13 changed files with 152 additions and 152 deletions
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src/helpers/unit.h
+14 -14
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@@ -35,44 +35,44 @@ namespace ifcopenshell { class file; }
// SI prefix multipliers, e.g. "MILLI" -> 1e-3. Empty key not present;
// callers should pass an empty prefix string for "no prefix".
extern const std::unordered_map<std::string, double> kSiPrefixes;
extern const std::unordered_map<std::string, double> SI_PREFIXES;
// SI prefix display symbols, e.g. "MILLI" -> "m".
extern const std::unordered_map<std::string, std::string> kSiPrefixSymbols;
extern const std::unordered_map<std::string, std::string> SI_PREFIX_SYMBOLS;
// Conversion-based unit name (lowercase, IFC convention) -> SI base scale.
// e.g. "foot" -> 0.3048, "square foot" -> 0.09290304.
extern const std::unordered_map<std::string, double> kSiConversions;
extern const std::unordered_map<std::string, double> SI_CONVERSIONS;
// Conversion-based unit name -> IFC unit type, e.g. "foot" -> "LENGTHUNIT".
extern const std::unordered_map<std::string, std::string> kImperialTypes;
extern const std::unordered_map<std::string, std::string> IMPERIAL_TYPES;
// Display symbol per unit name. Covers IfcSIUnit names ("METRE" -> "m") and
// IfcConversionBasedUnit names ("foot" -> "ft").
extern const std::unordered_map<std::string, std::string> kUnitSymbols;
extern const std::unordered_map<std::string, std::string> UNIT_SYMBOLS;
// Returns the multiplier for an SI prefix. Empty string returns 1.0.
double getPrefixMultiplier(const std::string& prefix);
double get_prefix_multiplier(const std::string& prefix);
// Returns the SI scale for an IfcNamedUnit such that
// value_in_unit * scale == value_in_si_base
// Walks IfcConversionBasedUnit chains down to IfcSIUnit. Returns nullopt
// when the chain bottoms out in IfcContextDependentUnit (cannot convert).
std::optional<double> siScaleFromNamedUnit(express::Base named_unit);
std::optional<double> si_scale_from_named_unit(express::Base named_unit);
// IfcProject.UnitsInContext (the IfcUnitAssignment). Returns nullopt if
// the file has no project or no assignment.
std::optional<express::Base> getUnitAssignment(ifcopenshell::file* ifc_file);
std::optional<express::Base> get_unit_assignment(ifcopenshell::file* ifc_file);
// First unit in the project's IfcUnitAssignment matching `unit_type`
// (e.g. "LENGTHUNIT"). Returns nullopt if not found.
std::optional<express::Base> getProjectUnit(ifcopenshell::file* ifc_file,
const std::string& unit_type);
std::optional<express::Base> get_project_unit(ifcopenshell::file* ifc_file,
const std::string& unit_type);
// Project unit -> SI base scale (e.g. project in mm => 0.001). Defaults
// to 1.0 when no project unit of the requested type is set.
double calculateUnitScale(ifcopenshell::file* ifc_file,
const std::string& unit_type = "LENGTHUNIT");
double calculate_unit_scale(ifcopenshell::file* ifc_file,
const std::string& unit_type = "LENGTHUNIT");
// Convert between two units identified by name + optional SI prefix.
// SQUARE_/CUBIC_ prefixed SI names get the prefix multiplier squared/cubed
@@ -83,7 +83,7 @@ double convert(double value,
// Convert between two IfcNamedUnit entities. Pulls Name and Prefix off each
// and delegates to convert(). IfcConversionBasedUnit names that don't appear
// in kSiConversions return the value unchanged.
double convertUnit(double value, express::Base from_unit, express::Base to_unit);
// in SI_CONVERSIONS return the value unchanged.
double convert_unit(double value, express::Base from_unit, express::Base to_unit);
#endif // UNIT_H