| | The abstract class AxisPlacement describes the
common behavior of positioning systems in 3D space,
such as axis or coordinate systems.
The Geom package provides two implementations of
3D positioning systems:
- the axis (Geom_Axis1Placement class), which is defined by:
- its origin, also termed the "Location point" of the axis,
- its unit vector, termed the "Direction" or "main <br>
Direction" of the axis;
- the right-handed coordinate system
(Geom_Axis2Placement class), which is defined by:
- its origin, also termed the "Location point" of the coordinate system,
- three orthogonal unit vectors, termed
respectively the "X Direction", the "Y Direction"
and the "Direction" of the coordinate system. As
the coordinate system is right-handed, these
unit vectors have the following relation:
"Direction" = "X Direction" ^
"Y Direction". The "Direction" is also
called the "main Direction" because, when the
unit vector is modified, the "X Direction" and "Y <br>
Direction" are recomputed, whereas when the "X <br>
Direction" or "Y Direction" is modified, the "main Direction" does not change.
The axis whose origin is the origin of the positioning
system and whose unit vector is its "main Direction" is
also called the "Axis" or "main Axis" of the positioning system.
More...
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1.6.3