Class TIfcDerivedUnit
Unit
Declaration
type TIfcDerivedUnit = class(TIfcUnit)
Description
A derived unit is a unit that is formed from an expression of other units.
Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4538).
Hierarchy
- TObject
- TPersistent
- TComponent
- TIfcPersistent
- TIfcUnit
- TIfcDerivedUnit
Overview
Methods
| Protected | function WantsGlobalId: Boolean; virtual; |
| Protected | class function IfcClassName: String; virtual; |
| Public | constructor Create(AOwner: TComponent); override; |
| Public | destructor Destroy; override; |
Properties
| Published | property GlobalId: String read FGlobalId write FGlobalId; |
| Published | property Elements: TIfcDerivedUnitElementList read FElements; |
| Published | property UnitType: TIfcDerivedUnitEnum read FUnitType write FUnitType; |
| Published | property UserDefinedType: TIfcLabel read FUserDefinedType write FUserDefinedType; |
| Published | property Name: TIfcLabel read FName write FName; |
Description
Methods
| Protected | function WantsGlobalId: Boolean; virtual; |
|
This item is declared in ancestor TIfcPersistent.
If Strictly following the spec, this should be only defined for TIfcRoot, because only IfcRoot has GlobalId. In reality, we need GlobalId at TIfcPersistent to load some files, and we sometimes need | |
| Protected | class function IfcClassName: String; virtual; |
|
This item is declared in ancestor TIfcPersistent. Name for the IFC standard, used in IFC files. By default, this is just ClassName with prefix 'T' removed. | |
| Public | constructor Create(AOwner: TComponent); override; |
|
This item has no description. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4545). | |
| Public | destructor Destroy; override; |
|
This item has no description. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4546). | |
Properties
| Published | property GlobalId: String read FGlobalId write FGlobalId; |
|
This item is declared in ancestor TIfcPersistent. Globally unique identifier for the object instance. Note: Not declared as TGUID, because TGUID cannot be published, but also we don't really need it: for our purposes, this identifier is just an arbitrary string. Note: IFC 4.3 specification puts this only at IfcRoot, not at every IFC class. But testcase https://github.com/buildingsmart-community/Community-Sample-Test-Files/blob/main/IFC%204.0.2.1%20(IFC%204)/ISO%20Spec%20archive/wall-with-opening-and-window.json (from IFC 4.0) shows this can be present at any IFC class, in particular TIfcGeometricRepresentationContext. In fact, TIfcGeometricRepresentationContext needs to have IFC JSON documentation says this, which seems to (unfortunately it is not unambiguous enough...) allow this at any IFC class: "Whereas the | |
| Published | property Elements: TIfcDerivedUnitElementList read FElements; |
|
The group of units and their exponents that define the derived unit. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4549). | |
| Published | property UnitType: TIfcDerivedUnitEnum read FUnitType write FUnitType; |
|
Type of the derived unit chosen from an enumeration of derived unit types for use in IFC models. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4553). | |
| Published | property UserDefinedType: TIfcLabel read FUserDefinedType write FUserDefinedType; |
|
Type of the derived unit if the UnitType attribute is set to UserDefined. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4556). | |
| Published | property Name: TIfcLabel read FName write FName; |
|
Name of the unit in addition to the unit type, particularly when the derived unit elements refer to conversion or context based units. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4560). | |
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