IfcTrapeziumProfileDef
Definition from IAI: The IfcTrapeziumProfileDef defines
a trapezium as the profile definition used used by the swept surface geometry
or the swept area solid. It is given by its Top X and Bottom X extent and its Y
extent as well as by the offset of the Top X extend, and placed within the 2D
position coordinate system, established by the Position attribute. It is
placed centric within the position coordinate
system.
Parameter HISTORY: New class in IFC
Release 1.5. The use definition has changed in IFC Release 2x.
ILLUSTRATION:
ISSUE: See
issue log for changes made in IFC Release 1.5. See issue and change log for
changes made in IFC Release 2x.
Table: Parameter of trapezium profile definition
Position
The
Position attribute defines the 2D position coordinate system of the
trapezium.
The IfcTrapeziumProfileDef is defined
within the position coordinate system, where the BottomDim defines the
length measure for the bottom line (half along the positive x-axis) and the
YDim defines the length measure for the parallel distance of bottom and
top line (half along the positive y-axis). The top line starts with a distance
of TopXOffset from [-BottomLine/2,YDim] (which can be negative, zero, or
positive) and has a length of TopXDim along the positive
x-axis.
EXPRESS specification:
|
| Position | : | Position coordinate system of the trapezium profile definition. |
| BottomXDim | : | The extent of the bottom line measured along the implicit x-axis. |
| TopXDim | : | The extent of the top line measured along the implicit x-axis. |
| YDim | : | The extent of the distance between the parallel bottom and top lines measured along the implicit y-axis. |
| TopXOffset | : | Offset from the beginning of the top line to the bottom line, measured along the implicit x-axis. |
| Name | Type | Referred through | Express-G | |
| IfcProfileDef | Entity |
|
Diagram 1 |
|