Class TIfcPresentationLayerWithStyle

Unit

Declaration

type TIfcPresentationLayerWithStyle = class(TIfcPresentationLayerAssignment)

Description

IFC class IfcPresentationLayerWithStyle.

Source: scene/load/ifc/castleifc_ifc_standard_types_autogenerated.inc (line 241).

Hierarchy

Show Additional Members:

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 Name: TIfcLabel read FName write FName;
Published property Description: TIfcText read FDescription write FDescription;
Published property AssignedItems: TIfcLayeredItemList read FAssignedItems;
Published property Identifier: TIfcIdentifier read FIdentifier write FIdentifier;

Description

Methods

Protected function WantsGlobalId: Boolean; virtual;

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;

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 320).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 321).

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 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;

Name of the layer.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 324).

Published property Description: TIfcText read FDescription write FDescription;

Additional description of the layer.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 327).

Published property AssignedItems: TIfcLayeredItemList read FAssignedItems;

The set of layered items, which are assigned to this layer. Always at least 1 element.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 331).

Published property Identifier: TIfcIdentifier read FIdentifier write FIdentifier;

An (internal) identifier assigned to the layer.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 334).


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