Add Gadfly.Scale.linestyle_discrete_manual() ?

[frankwswang]

Is it possible to add this function in the future?

Gadfly.Scale.linestyle_discrete_manual(styles...; levels=nothing, order=nothing)

Because sometimes I find the default arrangement of line styles may not fit well for certain shapes of lines.

Thank you.

[Mattriks]

The palette for discrete scales can be changed using Theme, see the Tutorial.
For line styles, the default palette is Theme().line_style. Custom line styles are possible:

using Compose, DataFrames, Gadfly, RDatasets

D = dataset("ggplot2", "economics")
Dl = stack(D[:, [1,2,6]],  Not(:Date))

# Example of a custom line style palette
lstyle = [[1, 1].*3.0mm, [5, 2, 3, 2].*2.0pt]

 p = plot(Dl, x=:Date, y=:value, color=:variable, linestyle=:variable,
    Geom.line, Scale.y_log10, 
#     Theme(line_style=[:dot, :dash])
    Theme(line_style=lstyle)
)

[frankwswang]

Thank you! This is very helpful!