API

Common properties of all view specifications. https://vega.github.io/vega-lite/docs/spec.html#common The data, transform and params common properties are defined in dedicated Spec types.

General concatenation specification. https://vega.github.io/vega-lite/docs/concat.html#concat

Concatenation specifications. https://vega.github.io/vega-lite/docs/concat.html

Specifications that impose certain constrains in their properties

Spec containing the data property of viewable specifications. https://vega.github.io/vega-lite/docs/data.html

Spec containing the encoding property of a Single or Layered view specification. https://vega.github.io/vega-lite/docs/encoding.html

Facet specification. https://vega.github.io/vega-lite/docs/facet.html

Horizontal concatenation specification. https://vega.github.io/vega-lite/docs/concat.html#hconcat

Layer specification. https://vega.github.io/vega-lite/docs/layer.html

Common properties of all layout (facet, repeat, concat) specifications. https://vega.github.io/vega-lite/docs/spec.html#common

Facet, Repeat and Concat specifications

Spec containing the mark property of a Single-View spec. https://vega.github.io/vega-lite/docs/mark.html

Layered and Layout specifications. https://vega.github.io/vega-lite/docs/composition.html

Spec containing the params common property to all viewable specifications. https://vega.github.io/vega-lite/docs/parameter.html

Specifications containing a specific set of properties

Repeat specification. https://vega.github.io/vega-lite/docs/repeat.html

Spec containing the resolve property common to all Multi-View specifications. https://vega.github.io/vega-lite/docs/resolve.html

Single view specification. https://vega.github.io/vega-lite/docs/spec.html#single

Top-Level specification of a Vega-Lite specification. https://vega.github.io/vega-lite/docs/spec.html#top-level

Spec containing the transform common property to all viewable specifications. https://vega.github.io/vega-lite/docs/transform.html

Vertical concatenation specification. https://vega.github.io/vega-lite/docs/concat.html#vconcat

Vega-Lite specification. https://vega.github.io/vega-lite/docs/spec.html

Single and Multi-view specifications

spec1::AbstractSpec * spec2::AbstractSpec

Multiplication of two AbstractSpec creates a new AbstractSpec as a composition of the two specifications. For instance, vlspec(mark=:bar) * vlspec(title="chart") will be equivalent to vlspec(mark=:bar, title="chart"). Properties defined in spec2 have precedence over spec1, meaning that if a given property is specified in both, then the result specification will use the property from spec2. If the types of the two specs are different then the result spec will be a VegaLiteSpec.

spec1::ConstrainedSpec + spec2::ConstrainedSpec

The addition of two specs will produce a new spec with both specs layered. The order matters as spec1 will appear below spec2. If the specs contain shared properties (e.g. data, encoding, width...), they will be promoted to the top level specification. Multi-view layout specs (facet, repeat, concat) cannot be layered.

getproperty(spec::AbstractSpec, property::Symbol)

Returns property property of a specification.

hcat(A::AbstractSpec...)
[spec1 spec2 spec3 ...]

Horizontal concatenation of specs.

hvcat(A::AbstractSpec...)
[spec1 spec2; spec3 spec4 ...]

General (wrappable) concatenation of specs.

propertynames(::AbstractSpec)

Return the top-level properties of a specification.

vcat(A::AbstractSpec...)
[spec1; spec2; spec3 ...]

Vertical concatenation of specs.

Data(table)
Data(; url, [format], [name])
Data(generator::SymbolOrString; properties...)

Creates a DataSpec containing the data property of a viewable specification. Available constructors are:

• using a table that supports the Tables.jl interface
• using a url to load the data from, with optional format and name properties.
• using a generator with specific properties to a use any of the available Vega-Lite data generator

See more in Vega-Lite's and Deneb's documentation.

Encoding(x; channels...)
Encoding(x, y; channels...)
Encoding(; channels...)

Creates an EncodingSpec containing the encoding property of a single or layer view specification. The x and y channels can be specified as positional arguments using the shorthad string syntax. See more in Vega-Lite's and Deneb.jl's.

Examples

Encoding("monthdate(date):T", "mean(precipitation):Q", color="year(date):O")
Encoding(
    x=field("bin_min:Q", bin=:binned, title="Maximum Daily Temperature (C)"),
    y=field("value:Q", scale=(range=[20, -20]), axis=nothing),
    fill=field="mean_temp:Q",
)

Facet(; [row], , [column], kw...)
Facet(field; columns::Int=nothing, kw...)

Creates a FacetSpec for a facet specification. . A field can be passed as a positional argument, or must be passed in the row/column keyword argument.

Examples

Facet("site:O", columns=2, sort=(op=:median, field=:yield))
Facet(row="Origin:N)

Mark(type; kw...)
Mark(; spec...)

Creates a MarkSpec containing the mark property of a single view specification. The type property of the mark can be specified as a positional argument. See more in Vega-Lite's and Deneb's documentation.

Params(; spec...)

Creates a ParamsSpec containing the params property of a viewable specification. See also the more convenient select_* methods and the interactive_scales function.

Repeat(; [row::Vector], [column::Vector], [layer::Vector])
Repeat(field::Vector{SymbolOrString}; columns::Int=nothing)

Creates a RepeatSpec for a repeat specification. . A field can be passed as a positional argument, or must be passed in the row/column/layer keyword argument.

Examples

Repeat([:Horsepower, :Miles_per_Gallon, :Acceleration], columns=2)
Repeat(column=[:distance, :delay, :time])

Transform(; spec...)

Creates a TransformSpec containing the transform property of a viewable specification. See also the more convenient transform_* methods.

concat(A::AbstractSpec...; columns)

condition(param::SymbolOrString, iftrue, iffalse; empty=nothing)
condition_test(test::String, iftrue, iffalse)
condition(param_then_pairs::Vector{Pair}, iffalse; empty::Vector=nothing)
condition_test(ifthen_pairs::Vector{Pair}, iffalse)

If iftrue/iffalse isn't a NamedTuple, then it'll be converted as a NamedTuple with name :value. Nested conditions via a vector of ifthen_pairs.

Examples

condition(:myparam, 1, 2; empty=true)
condition_test("datum.x > 0", field("color:O"), :blue)
condition_test(["datum.x > 5" => field("color:O"), "datum.x < 0" => :blue], :gray)

config(; properties...)
config(type; properties...)

expr(expr)

Convenient function to create an expr spec: {"expr": expr}.

field(field; kw...)

Shortcut to create an arbitrary encoding channel, the positional argument field can use the shorthand string syntax (e.g. "mean(x):Q").

interactive_scales(;bindx=true, bindy=true, shift_on_y=false)

Creates a ParamsSpec that can be composed to other specs to create interactive pan (mouse hold and drag) and zoom (mouse wheel) charts. bindx and bindy specify if the x and y channels are to be bound. If shift_on_y is true, then the shift key must be hold to pan and zoom in the y channel.

layout(; align, bounds, center, spacing, columns)

Set layout properties. Needs to be composed with a LayoutSpec (Repeat, Facet, Concat).

param(param)

Convenient function to create a param spec: {"param": param}.

print_theme()

Prints the specification of the current theme.

projection(type; kw...)

Sets the projection properties.

resolve(type; channels...)
resolve(type, channel, option)

Creates a ResolveSpec. The type indicates the resolution to be defined: scale, axis, or legend.

For scales, resolution can be specified for every channel. For axes, resolutions can be defined for positional channels (x, y, xOffset, yOffset). For legends, resolutions can be defined for non-positional channels (color, opacity, shape, and size).

There are two options to resolve a scale, axis, or legend: shared and independent. Independent scales imply independent axes and legends.

The defaults are documented in Vega-Lite's documentation.

Example

resolve(:scale, color=:independent)

resolve_axis(; channels...)

Alias to resolve(:axis; channels...)

resolve_legend(; channels...)

Alias to resolve(:legend; channels...)

resolve_scale(; channels...)

Alias to resolve(:scale; channels...)

select(type, name; value, bind, select_options...)

Convenient function to create a ParamsSpec with the following structure:

{
  "name": name,
  "value": value,
  "select": {
    "type": type,
    select_options...
  },
  "bind": bind
}

select_bind_input(type, name; value, select, bind_options...)

Convenient function to create a ParamsSpec with the following structure:

{
  "name": name,
  "value": value,
  "select": select,
  "bind": {
    "input": type,
    bind_options...
  }
}

select_checkbox(type, name; value, select, bind_options...)

select_dropdown(type, name; options, value, select, bind_options...)

options is required

select_interval()

select_legend(name; encodings=:color, fields=nothing, bind_options=nothing)

Creates a ParamSpec named name that can be composed to other specs to create selectable legends bound to the given encoding or field. To customize the events that trigger legend interaction, set bind_options with a property that maps to a Vega event stream (e.g. "dblclick"). More info about legend binding: https://vega.github.io/vega-lite/docs/bind.html#legend-binding

select_point()

select_radio(type, name; options, value, select, bind_options...)

options is required

select_range(type, name; value, select, bind_options...)

set_theme!(theme::Symbol)

Sets the current theme to be used. The default Deneb's theme (:default) sets the following global config:

{
    "view": {"continuousWidth": 300, "continuousHeight": 300, "step": 25},
    "mark": {"tooltip": true}
}

The :default_no_tooltip theme sets the default size as above, but disables tooltips. The :empty theme uses Vega-Lite default empty configuration.

Other available themes are any of the Vega themes: :dark, :excel, :fivethirtyeight, :ggplot2, :googlecharts, :latimes, :powerbi, :quartz, :urbaninstitute, :vox (see https://vega.github.io/vega-themes for more info). In this case the :default global config will be used.

set_theme!(config_theme::Symbol, vega_theme::Symbol)

Sets the global config theme (:default, :default_no_tooltip, :empty) and the vega theme (use vega_theme = :default for no vega theme).

set_theme!(config::NamedTuple, [vega_theme::Symbol])

Sets a theme with a user-specified config.

spec(s)

Creates an arbitrary Vega-Lite spec.

title(title)

transform_fold(fold::Vector; as=(:key, :value))

Wide to long transformation

if a sortby field starts with '-' then descending order

vlspec(s)

Creates a Vega-Lite spec enforcing certain Vega-Lite constrains.

Example

vlspec(
    data=(; url="https://vega.github.io/vega-datasets/data/seattle-weather.csv"),
    mark=:bar,
    encoding=(
        x=(timeUnit=:month, field=:date, type=:ordinal),
        y=(aggregate=:mean, field=:precipitation),
    )
)