Class TIfcCompoundPlaneAngleMeasure

Description

Hierarchy

Methods

Properties

Unit

CastleIfc

Declaration

type TIfcCompoundPlaneAngleMeasure = class(TIfcPersistent)

Description

Compound measure of plane angle in degrees, minutes, seconds, and optionally millionth-seconds of arc. IFC defines it as list of 3 or 4 integers. We considered using TCastleVector4PersistentSimple for this, but actually a regular class with 4 integer properties is better, fits IFC JSON encoding.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3379).

Hierarchy

TObject
TPersistent
TComponent
TIfcPersistent
TIfcCompoundPlaneAngleMeasure

Show Additional Members: Inherited Protected

Overview

Methods

Protected	`function WantsGlobalId: Boolean; virtual;`
Protected	`class function IfcClassName: String; virtual;`

Properties

Published	`property GlobalId: String read FGlobalId write FGlobalId;`
Published	`property Degrees: Integer read FDegrees write FDegrees;`
Published	`property Minutes: Integer read FMinutes write FMinutes;`
Published	`property Seconds: Integer read FSeconds write FSeconds;`
Published	`property MicroSeconds: Integer read FMicroSeconds write FMicroSeconds;`

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).

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 Degrees: Integer read FDegrees write FDegrees;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3386).

Published property Minutes: Integer read FMinutes write FMinutes;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3387).

Published property Seconds: Integer read FSeconds write FSeconds;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3388).

Published property MicroSeconds: Integer read FMicroSeconds write FMicroSeconds;

This item has no description.