Sets the line drawing parameters: style and width.
If line-style is
, user-pattern
is a 16-bit integer specifying the pattern used to draw
straight lines. For instance, a user-defined pattern of
#b1110001110001010
would draw
``''.
Line-style is one of the following:
Thickness can be any positive integer, and in particular:
which is 1
which is 3
Other values are not illegal, but do not necessarily produce different
results.