How to Line Type Aesthetic
Another aesthetic property is linetype. Linetype is used for definition of
line visual character. This parameter is not used only for line geometry,
but also for geometries that have border lines, for example geom_boxplot
or geom_polygon. As in the previous examples, linetype aesthetic can be
set or mapped to variable from the dataset. If you set it, you can use
help features that are hidden in context-menu. In the context-menu you
can choose from several types of lines.
Linetype you can set using its name (string enclosed in quotes) or as an
integer value ranging from 0 (blank) to 6 (twodash). In addition, you
can also create your own line through a special notation. Examles are
listed in the context-menu, at the bottom. This record is based on the
length of the on / off stretches of line. If you type "33" this value
specifies three units on followed by three off. Examples of the various
settings are in the following figure.
As with other properties, linetype can be mapped to selected variable
from the dataset. This variable must have a categorical character.
