Represent Polyline

Overview

Identifies the information requirements for the provision of a polyline.
A polyline is a line consisting of segments, each segment occurring between successive points soecified for the polyline. For a polyline comprising N points, there are N-1 segments.

Results

Specification of a list of points that define a polyline.

Description	Entity/Pset/Functional Part	MAN	REC	OPT
Set the coordinate values for each of the points in the polyline. 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 each point is derived from the number of coordinates specified.	IfcCartesianPoint.Dim
The points that define the polyline are specified as a list in the order of occurrence. There must be at least two points to specify a polyline.	IfcPolyline.Points::IfcCartesianPoint
The space dimensionality for the polyline is derived from dimensional context of the polyline (2 or 3 dimensional). This attribute is inherited from the IfcCurve supertype.	IfcPolyline.Dim

IFC Entities Required

IfcBoundedCurve
IfcCartesianPoint
IfcCurve
IfcGeometricRepresentationItem
IfcPoint
IfcPolyline
IfcRepresentationItem

IFC Datatypes Required

IfcDimensionCount
IfcLengthMeasure

IFC Functions Required

-

IDM Functional Parts Required

-

EXPRESS-G

EXPRESS Schema

SCHEMA FP_REPRESENT_POLYLINE;

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

  TYPE IfcLengthMeasure = REAL;
  END_TYPE;

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

  ENTITY IfcRepresentationItem
    ABSTRACT SUPERTYPE;
  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 IfcBoundedCurve
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcCurve);
  END_ENTITY;

  ENTITY IfcPolyline
    SUBTYPE OF(IfcBoundedCurve);
      Points : LIST [2:?] OF IfcCartesianPoint;
    WHERE
      WR41 : SIZEOF(QUERY(Temp <* Points | Temp.Dim <> Points[1].Dim)) = 0;
  END_ENTITY;

END_SCHEMA;

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