altair.typing.EncodeKwds#

class altair.typing.EncodeKwds#

Encoding channels map properties of the data to visual properties of the chart.

Parameters:
angle

Rotation angle of point and text marks.

color

Color of the marks - either fill or stroke color based on the filled property of mark definition. By default, color represents fill color for "area", "bar", "tick", "text", "trail", "circle", and "square" / stroke color for "line" and "point".

Default value: If undefined, the default color depends on mark config’s color property.

Note: 1) For fine-grained control over both fill and stroke colors of the marks, please use the fill and stroke channels. The fill or stroke encodings have higher precedence than color, thus may override the color encoding if conflicting encodings are specified. 2) See the scale documentation for more information about customizing color scheme.

column

A field definition for the horizontal facet of trellis plots.

description

A text description of this mark for ARIA accessibility (SVG output only). For SVG output the "aria-label" attribute will be set to this description.

detail

Additional levels of detail for grouping data in aggregate views and in line, trail, and area marks without mapping data to a specific visual channel.

facet

A field definition for the (flexible) facet of trellis plots.

If either row or column is specified, this channel will be ignored.

fill

Fill color of the marks. Default value: If undefined, the default color depends on mark config’s color property.

Note: The fill encoding has higher precedence than color, thus may override the color encoding if conflicting encodings are specified.

fillOpacity

Fill opacity of the marks.

Default value: If undefined, the default opacity depends on mark config’s fillOpacity property.

href

A URL to load upon mouse click.

key

A data field to use as a unique key for data binding. When a visualization’s data is updated, the key value will be used to match data elements to existing mark instances. Use a key channel to enable object constancy for transitions over dynamic data.

latitude

Latitude position of geographically projected marks.

latitude2

Latitude-2 position for geographically projected ranged "area", "bar", "rect", and "rule".

longitude

Longitude position of geographically projected marks.

longitude2

Longitude-2 position for geographically projected ranged "area", "bar", "rect", and "rule".

opacity

Opacity of the marks.

Default value: If undefined, the default opacity depends on mark config’s opacity property.

order

Order of the marks.

  • For stacked marks, this order channel encodes stack order.

  • For line and trail marks, this order channel encodes order of data points in the lines. This can be useful for creating a connected scatterplot. Setting order to {"value": null} makes the line marks use the original order in the data sources.

  • Otherwise, this order channel encodes layer order of the marks.

Note: In aggregate plots, order field should be ``aggregate``d to avoid creating additional aggregation grouping.

radius

The outer radius in pixels of arc marks.

radius2

The inner radius in pixels of arc marks.

row

A field definition for the vertical facet of trellis plots.

shape

Shape of the mark.

1. For point marks the supported values include: - plotting shapes: "circle", "square", "cross", "diamond", "triangle-up", "triangle-down", "triangle-right", or "triangle-left". - the line symbol "stroke" - centered directional shapes "arrow", "wedge", or "triangle" - a custom SVG path string (For correct sizing, custom shape paths should be defined within a square bounding box with coordinates ranging from -1 to 1 along both the x and y dimensions.)

  1. For geoshape marks it should be a field definition of the geojson data

Default value: If undefined, the default shape depends on mark config’s shape property. ("circle" if unset.)

size

Size of the mark.

  • For "point", "square" and "circle", - the symbol size, or pixel area of the mark.

  • For "bar" and "tick" - the bar and tick’s size.

  • For "text" - the text’s font size.

  • Size is unsupported for "line", "area", and "rect". (Use "trail" instead of line with varying size)

stroke

Stroke color of the marks. Default value: If undefined, the default color depends on mark config’s color property.

Note: The stroke encoding has higher precedence than color, thus may override the color encoding if conflicting encodings are specified.

strokeDash

Stroke dash of the marks.

Default value: [1,0] (No dash).

strokeOpacity

Stroke opacity of the marks.

Default value: If undefined, the default opacity depends on mark config’s strokeOpacity property.

strokeWidth

Stroke width of the marks.

Default value: If undefined, the default stroke width depends on mark config’s strokeWidth property.

text

Text of the text mark.

theta

  • For arc marks, the arc length in radians if theta2 is not specified, otherwise the start arc angle. (A value of 0 indicates up or “north”, increasing values proceed clockwise.)

  • For text marks, polar coordinate angle in radians.

theta2

The end angle of arc marks in radians. A value of 0 indicates up or “north”, increasing values proceed clockwise.

tooltip

The tooltip text to show upon mouse hover. Specifying tooltip encoding overrides the tooltip property in the mark definition.

See the tooltip documentation for a detailed discussion about tooltip in Vega-Lite.

url

The URL of an image mark.

x

X coordinates of the marks, or width of horizontal "bar" and "area" without specified x2 or width.

The value of this channel can be a number or a string "width" for the width of the plot.

x2

X2 coordinates for ranged "area", "bar", "rect", and "rule".

The value of this channel can be a number or a string "width" for the width of the plot.

xError

Error value of x coordinates for error specified "errorbar" and "errorband".

xError2

Secondary error value of x coordinates for error specified "errorbar" and "errorband".

xOffset

Offset of x-position of the marks

y

Y coordinates of the marks, or height of vertical "bar" and "area" without specified y2 or height.

The value of this channel can be a number or a string "height" for the height of the plot.

y2

Y2 coordinates for ranged "area", "bar", "rect", and "rule".

The value of this channel can be a number or a string "height" for the height of the plot.

yError

Error value of y coordinates for error specified "errorbar" and "errorband".

yError2

Secondary error value of y coordinates for error specified "errorbar" and "errorband".

yOffset

Offset of y-position of the marks

__init__(*args, **kwargs)#

Methods

__init__(*args, **kwargs)

clear()

copy()

fromkeys(iterable[, value])

Create a new dictionary with keys from iterable and values set to value.

get(key[, default])

Return the value for key if key is in the dictionary, else default.

items()

keys()

pop(key[, default])

If the key is not found, return the default if given; otherwise, raise a KeyError.

popitem(/)

Remove and return a (key, value) pair as a 2-tuple.

setdefault(key[, default])

Insert key with a value of default if key is not in the dictionary.

update([E, ]**F)

If E is present and has a .keys() method, then does: for k in E: D[k] = E[k] If E is present and lacks a .keys() method, then does: for k, v in E: D[k] = v In either case, this is followed by: for k in F: D[k] = F[k]

values()

Attributes

angle

color

column

description

detail

facet

fill

fillOpacity

href

key

latitude

latitude2

longitude

longitude2

opacity

order

radius

radius2

row

shape

size

stroke

strokeDash

strokeOpacity

strokeWidth

text

theta

theta2

tooltip

url

x

x2

xError

xError2

xOffset

y

y2

yError

yError2

yOffset

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