lineOrientation property

The strategy for whether LabelDefinition.placement above or below a line geometry will be interpreted as above or below on the screen, or with respect to the direction of line's geometry (that is, the digitization order in which the vertices are listed).

If the LabelDefinition.lineOrientation is set to LabelLineOrientation.screen then LabelDefinition.placement above means the label will be offset perpendicularly from its line segment towards the top of the screen. If the LabelDefinition.lineOrientation is set to LabelLineOrientation.direction then LabelDefinition.placement above means the label will be offset perpendicularly left from its line segment. If the LabelDefinition.lineOrientation is set to LabelLineOrientation.unconstrained then the label will be offset perpendicularly to whichever side of the line geometry has space (defaulting to above in the screen sense). LabelDefinition.placement below would have the corresponding interpretations. The default is LabelLineOrientation.screen.