3. Basics of PhotoLine / 3.3 User Interface Elements
The line style field shows how a vector line will look like:
.
Line
styles are defining the width of a line, the kind of line join and the shape of
the line ends. Setting a line width of 0 has a special meaning: it means that
the line is a hair line. Hair lines are always exactly one pixel wide,
regardless of the magnification of the output.
Line styles are edited with the line editor by double-clicking (see chapter 3.8).