Class TIfcGeometricRepresentationSubContext
Unit
Declaration
type TIfcGeometricRepresentationSubContext = class(TIfcRepresentationContext)
Description
Context that applies to several shape representations of a product being a sub context, sharing the WorldCoordinateSystem, CoordinateSpaceDimension, Precision and TrueNorth attributes with the parent IfcGeometricRepresentationContext.
Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4861).
Hierarchy
- TObject
- TPersistent
- TComponent
- TIfcPersistent
- TIfcRepresentationContext
- TIfcGeometricRepresentationSubContext
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 ContextIdentifier: TIfcLabel read FContextIdentifier write FContextIdentifier; |
| Published | property ContextType: TIfcLabel read FContextType write FContextType; |
| Published | property RepresentationsInContext: TIfcRepresentationList read FRepresentationsInContext; |
| Published | property ParentContext: TIfcGeometricRepresentationContext read FParentContext write FParentContext; |
| Published | property TargetScale: TIfcPositiveRatioMeasure read FTargetScale write FTargetScale; |
| Published | property TargetView: TIfcGeometricProjectionEnum read FTargetView write FTargetView; |
| Published | property UserDefinedTargetView: TIfcLabel read FUserDefinedTargetView write FUserDefinedTargetView; |
Description
Methods
| Protected | function WantsGlobalId: Boolean; virtual; |
|
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; |
|
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 4785). | |
| Public | destructor Destroy; override; |
|
This item has no description. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4786). | |
Properties
| Published | property GlobalId: String read FGlobalId write FGlobalId; |
|
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 ContextIdentifier: TIfcLabel read FContextIdentifier write FContextIdentifier; |
|
The optional identifier of the representation context as used within a project. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4789). | |
| Published | property ContextType: TIfcLabel read FContextType write FContextType; |
|
The description of the type of a representation context. The supported values for context type are to be specified by implementers agreements. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4793). | |
| Published | property RepresentationsInContext: TIfcRepresentationList read FRepresentationsInContext; |
|
All shape representations that are defined in the same representation context. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4796). | |
| Published | property ParentContext: TIfcGeometricRepresentationContext read FParentContext write FParentContext; |
|
Parent context from which the sub context derives its world coordinate system, precision, space coordinate dimension and true north. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4870). | |
| Published | property TargetScale: TIfcPositiveRatioMeasure read FTargetScale write FTargetScale; |
|
The target plot scale of the representation to which this representation context applies. NOTE Scale indicates the target plot scale for the representation sub context, all annotation styles are given in plot dimensions according to this target plot scale. If multiple instances of IfcGeometricRepresentationSubContext are given having the same TargetView value, the target plot scale applies up to the next smaller scale, or up to unlimited small scale. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4881). | |
| Published | property TargetView: TIfcGeometricProjectionEnum read FTargetView write FTargetView; |
|
Target view of the representation to which this representation context applies. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4884). | |
| Published | property UserDefinedTargetView: TIfcLabel read FUserDefinedTargetView write FUserDefinedTargetView; |
|
User defined target view, this attribute value shall be given, if the TargetView attribute is set to TIfcGeometricProjectionEnum.UserDefined. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4888). | |
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