Guide.colorkey

Guide.colorkey enables control of some fields of the auto-generated colorkey. Currently, you can change the colorkey title (for any plot), the item labels (for plots with a discrete color scale), and put the colorkey inside any plot. The fields can be named e.g. Guide.colorkey(title="Group", labels=["A","B"], pos=[0w,0h]), or given in order e.g. Guide.colorkey("Group", ["A","B"], [0w,0h]).

Arguments

• title: Legend title (for any plot)

• labels: Legend item labels (for plots with a discrete color scale)

• pos: [x,y] position of the colorkey inside any plot. Setting Guide.colorkey(pos=) will override the Theme(key_position=) setting. Setting Theme(key_position=:inside) without setting pos will place the key in the lower right quadrant of the plot (see example below)

Colorkey position

pos can be given in relative or absolute units (do using Compose before plotting):

• _Relative units_: e.g. [0.7w, 0.2h] will place the key in the lower right quadrant, [0.05w, -0.25h] in the upper left (see example below).

• _Absolute units_: e.g. [0mm, 0mm] the key is left-centered, or use the plot scales like [x,y]. For the latter, the x-position will make sense, but the key will be offset below the y-position, because of the way the key is rendered.

Examples

Dsleep = dataset("ggplot2", "msleep")[[:Vore,:BrainWt,:BodyWt,:SleepTotal]]
DataFrames.complete_cases!(Dsleep)
Dsleep[:SleepTime] = Dsleep[:SleepTotal] .> 8
plot(Dsleep, x=:BodyWt, y=:BrainWt, Geom.point, color=:SleepTime,
    Guide.colorkey(title="Sleep", labels=[">8","≤8"]),
    Scale.x_log10, Scale.y_log10 )

iris = dataset("datasets","iris")
pa = plot(iris, x=:SepalLength, y=:PetalLength, color=:Species, Geom.point,
      Theme(key_position=:inside) )
pb = plot(iris, x=:SepalLength, y=:PetalLength, color=:Species, Geom.point,
      Guide.colorkey(title="Iris", pos=[0.05w,-0.28h]) )
hstack(pa, pb)