Engee documentation

Colors

There are many color attributes, for lines, fills, markers, backgrounds, and foregrounds. Many colors follow a hierarchy…​ linecolor gets its value from seriescolor, for example, unless you override the value. This allows for you to simply set precisely what you want, without lots of boilerplate.

Color attributes will accept many different types:

  • Symbols or Strings will be passed to Colors.parse(Colorant, c), so :red is equivalent to colorant"red"

  • false or nothing will be converted to an invisible RGBA(0,0,0,0)

  • Any Colors.Colorant, with or without alpha/opacity

  • Any Plots.ColorScheme, which includes ColorVector, ColorGradient, etc

  • An integer, which picks the corresponding color from the seriescolor

In addition, there is an extensive facility for selecting and generating color maps/gradients.

  • A valid Symbol: :inferno (the default), :heat, :blues, etc

  • A list of colors (or anything that can be converted to a color)

  • A pre-built ColorGradient, which can be constructed with the cgrad helper function. See this short tutorial for example usage.

Color names

The supported color names is the union of X11’s and SVG’s. They are defined in the Colors.jl ,like blue, blue2, blue3, …​etc.

Series Colors

For series, there are a few attributes to know:

  • seriescolor: Not used directly, but defines the base color for the series

  • linecolor: Color of paths

  • fillcolor: Color of area fill

  • markercolor: Color of the interior of markers and shapes

  • markerstrokecolor: Color of the border/stroke of markers and shapes

seriescolor defaults to :auto, and gets assigned a color from the color_palette based on its index in the subplot. By default, the other colors :match. (See the table below)

In general, color gradients can be set by *color, and the corresponding color values to look up in the gradients by *_z.
This color…​ matches this color…​

linecolor

seriescolor

fillcolor

seriescolor

markercolor

seriescolor

markerstrokecolor

foregroundcolorsubplot

each of these attributes have a corresponding alpha override: seriesalpha, linealpha, fillalpha, markeralpha, and markerstrokealpha. They are optional, and you can still give alpha information as part of an Colors.RGBA.

In some contexts, and when the user hasn’t set a value, the linecolor or markerstrokecolor may be overridden.

Foreground/Background

Foreground and background colors work similarly:

This color…​ matches this color…​

background_color_outside

background_color

background_color_subplot

background_color

background_color_legend

background_color_subplot

background_color_inside

background_color_subplot

foreground_color_subplot

foreground_color

foreground_color_legend

foreground_color_subplot

foreground_color_grid

foreground_color_subplot

foreground_color_title

foreground_color_subplot

foreground_color_axis

foreground_color_subplot

foreground_color_border

foreground_color_subplot

foreground_color_guide

foreground_color_subplot

foreground_color_text

foreground_color_subplot

Misc

  • the linecolor under the default theme is not CSS-defined, but close to :steelblue.

  • line_z and marker_z parameters will map data values into a ColorGradient value

  • color_palette determines the colors assigned when seriescolor == :auto:

    • If passed a vector of colors, it will force cycling of those colors

    • If passed a gradient, it will infinitely draw unique colors from that gradient, attempting to spread them out