IfcHatchLineDistanceSelect

BACnet MVD

#### IfcHatchLineDistanceSelect

Natural language names

| Hatch Line Distance Select
| Sélection de la distance entre les lignes de hachure

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcHatchLineDistanceSelect |  |  |  |
IfcVector |  |  | ADDED |
IfcOneDirectionRepeatFactor | X | X | DELETED |

##### Semantic definitions at the type

Type definition

The IfcHatchLineDistanceSelect is a selection between different ways to determine the distance and optionally the start point of hatch lines, either by an offset distance measure or by a vector.

The vector, if selected, acts as a one time repeat factor in the fill area style hatching for determining the origin of the repeated hatch line relative to the origin of the previous hatch line, Given the initial position of any hatch line, the one direction repeat factor determines two new positions according to the equation:

> NOTE Definition according to ISO 10303-46:

> I + k * R k ∈{-1,1}

> Figure 334 shows the use of a vector for hatch line distances

> Figure 334 — vector as one direction repeat factor

> NOTE Use of IfcVector as one time repeat factor is adapted from one_direction_repeat_factor defined in ISO10303-46

> HISTORY New select type in IFC2x3

Select definition

Type | Description
--- | ---
IfcPositiveLengthMeasure |
IfcVector |

##### Formal representations

XML Specification
`<xs:group name="IfcHatchLineDistanceSelect">
<xs:choice>
<xs:element ref="ifc:IfcPositiveLengthMeasure-wrapper"/>
<xs:element ref="ifc:IfcVector"/>
</xs:choice>
</xs:group>
`
EXPRESS Specification
`TYPE IfcHatchLineDistanceSelect = SELECT (
IfcPositiveLengthMeasure,
IfcVector);
END_TYPE;

EXPRESS-G diagram

`

References: IfcFillAreaStyleHatching

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