Represent Line

Overview

Identifies the information requirements for the provision of a line.
A line is specified as commencing at a point and having magnitude and direction specified by a vector.

Results

Specification of a line with start point, magnitude and direction.

Description	Entity/Pset/Functional Part	MAN	REC	OPT
Set the coordinate values for the start point of the line. Coordinate[1] is the X coordinate, Coordinate[2] is the Y coordinate, and Coordinate[3] is the Z coordinate	IfcCartesianPoint.Coordinates::IfcLengthMeasure
The space dimensionality for the point is derived from the number of coordinates specified.	IfcCartesianPoint.Dim
Set the values for the direction ratios that will determine the orientation of the line. Direction ratios determine the angle of the line within the coordinate space. 2 values are required for a 2 dimensional line, 3 are necessary for a 3 dimensional line.	IfcDirection.DirectionRatios::REAL
The space dimensionality for the direction is derived from the number of ratio values specified.	IfcDirection.Dim
Assign the direction as the orientation of the vector	IfcVector.Orientation::IfcDirection
Set the magnitude of the vector for the line This sets the length of the line.	IfcVector.Magnitude::IfcLengthMeasure
The space dimensionality for the vector is derived from the orientation defined by the direction ratios.	IfcDirection.Dim
Assign the point as the start point of the line	IfcLine.Pnt::IfcCartesianPoint
Assign the vector as the direction of the line	IfcLine.Dir::IfcVector
The space dimensionality for the line is derived from dimensional context of the line (2 or 3 dimensional). This attribute is inherited from the IfcCurve supertype.	IfcLine.Dim

IFC Entities Required

IfcCartesianPoint
IfcCurve
IfcDirection
IfcGeometricRepresentationItem
IfcLine
IfcPoint
IfcRepresentationItem
IfcVector

IFC Datatypes Required

IfcDimensionCount
IfcLengthMeasure

IFC Functions Required

-

IDM Functional Parts Required

-

EXPRESS-G

EXPRESS Schema

SCHEMA FP_REPRESENT_LINE;

  TYPE IfcDimensionCount = INTEGER;
    WHERE
      WR1 : { 0 < SELF <= 3 };
  END_TYPE;

  TYPE IfcLengthMeasure = REAL;
  END_TYPE;

  ENTITY IfcGeometricRepresentationItem
    ABSTRACT SUPERTYPE OF (ONEOF(IfcCurve, IfcDirection, IfcPoint, IfcVector))
    SUBTYPE OF(IfcRepresentationItem);
  END_ENTITY;

  ENTITY IfcRepresentationItem
    ABSTRACT SUPERTYPE;
  END_ENTITY;

  ENTITY IfcDirection
    SUBTYPE OF(IfcGeometricRepresentationItem);
      DirectionRatios : LIST [2:3] OF REAL;
    DERIVE
      Dim             : IfcDimensionCount := HIINDEX(DirectionRatios);
  END_ENTITY;

  ENTITY IfcCartesianPoint
    SUBTYPE OF(IfcPoint);
      Coordinates : LIST [1:3] OF IfcLengthMeasure;
    DERIVE
      Dim         : IfcDimensionCount := HIINDEX(Coordinates);
    WHERE
      WR1 : HIINDEX(Coordinates) >= 2;
  END_ENTITY;

  ENTITY IfcPoint
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcGeometricRepresentationItem);
  END_ENTITY;

  ENTITY IfcCurve
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcGeometricRepresentationItem);
    DERIVE
      Dim : IfcDimensionCount := IfcCurveDim(SELF);
  END_ENTITY;

  ENTITY IfcLine
    SUBTYPE OF(IfcCurve);
      Pnt : IfcCartesianPoint;
      Dir : IfcVector;
    WHERE
      WR1 : Dir.Dim = Pnt.Dim;
  END_ENTITY;

  ENTITY IfcVector
    SUBTYPE OF(IfcGeometricRepresentationItem);
      Orientation : IfcDirection;
      Magnitude   : IfcLengthMeasure;
    DERIVE
      Dim         : IfcDimensionCount := Orientation.Dim;
    WHERE
      WR1 : Magnitude >= 0.0;
  END_ENTITY;

END_SCHEMA;

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