Class TIfcMeasureWithUnit
Unit
Declaration
type TIfcMeasureWithUnit = class(TIfcPersistent)
Description
This has two usages:
1. For representing measure value together with its unit on the entity type attribute level; thus overriding the IFC model global unit assignments.
2. For conversion based unit to give the conversion rate and its base.
Spec: https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcMeasureWithUnit.htm
Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4731).
Hierarchy
- TObject
- TPersistent
- TComponent
- TIfcPersistent
- TIfcMeasureWithUnit
Overview
Methods
| Protected | function WantsGlobalId: Boolean; virtual; |
| Protected | class function IfcClassName: String; virtual; |
Properties
| Published | property GlobalId: String read FGlobalId write FGlobalId; |
| Published | property ValueComponent: TIfcValue read FValueComponent write FValueComponent; |
| Published | property UnitComponent: TIfcUnit read FUnitComponent write FUnitComponent; |
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. | |
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 ValueComponent: TIfcValue read FValueComponent write FValueComponent; |
|
Value of the physical quantity when expressed in the specified units. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4737). | |
| Published | property UnitComponent: TIfcUnit read FUnitComponent write FUnitComponent; |
|
The unit in which the physical quantity is expressed. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4740). | |
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