Protected	`function WantsGlobalId: Boolean; virtual;`
Protected	`class function IfcClassName: String; virtual;`
Public	`constructor Create(AOwner: TComponent); override;`
Public	`destructor Destroy; override;`
Public	`function TryGetFontSizeLength(out Size: Single): Boolean;`

Properties

Published	`property GlobalId: String read FGlobalId write FGlobalId;`
Published	`property Name: TIfcLabel read FName write FName;`
Published	`property FontFamily: TCastleStringList read FFontFamily;`
Published	`property FontStyle: TIfcFontStyle read FFontStyle write FFontStyle;`
Published	`property FontVariant: TIfcFontVariant read FFontVariant write FFontVariant;`
Published	`property FontWeight: TIfcFontWeight read FFontWeight write FFontWeight;`
Published	`property FontSize: TIfcSizeSelect read FFontSize write FFontSize;`

Description

Methods

Protected function WantsGlobalId: Boolean; virtual;

This item is declared in ancestor TIfcPersistent.

If True, instances of this class will have GlobalId auto-assigned at saving, and they will be saved as part of the "data" list in IFC JSON files.

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 WantsGlobalId = True to save some files.

Source: scene/load/ifc/castleifc_ifc_types.inc (line 52).

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.

Source: scene/load/ifc/castleifc_ifc_types.inc (line 56).

Public constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4660).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4661).

Public function TryGetFontSizeLength(out Size: Single): Boolean;

Font size as a length (in the model length units), if possible. Returns False if FontSize is Nil or is not a length measure.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4665).

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 GlobalId to be successfully saved (avoid recursively trying to serialize it) in some cases. We indicate such classes with WantsGlobalId.

IFC JSON documentation says this, which seems to (unfortunately it is not unambiguous enough...) allow this at any IFC class: "Whereas the globalId attribute is only available to those elements that are descendent of the IfcRoot entity in the EXPRESS schema, we encourage a broader use of this globalId, to enable referencing between objects in a JSON file when useful.".

Source: scene/load/ifc/castleifc_ifc_types.inc (line 79).

Published property Name: TIfcLabel read FName write FName;

This item is declared in ancestor TIfcPreDefinedItem.

Name of the pre-defined item.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4640).

Published property FontFamily: TCastleStringList read FFontFamily;

Font families, in order of preference. Always at least 1 item.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4668).

Published property FontStyle: TIfcFontStyle read FFontStyle write FFontStyle;

Font style.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4671).

Published property FontVariant: TIfcFontVariant read FFontVariant write FFontVariant;