Inserts a single mid-point value into a two-element domain. The mid-point value must lie between the domain minimum and maximum values. This property can be useful for setting a midpoint for diverging color scales. The domainMid property is only intended for use with scales supporting continuous, piecewise domains.

An expression for an array of raw values that, if non-null, directly overrides the domain property. This is useful for supporting interactions such as panning or zooming a scale. The scale may be initially determined using a data-driven domain, then modified in response to user input by setting the rawDomain value. Continuous Scales – mapping continuous domains to continuous output ranges ( "linear", "pow", "sqrt", "symlog", "log", "time", "utc". If true, values that exceed the data domain are clamped to either the minimum or maximum range value Sets the maximum value in the scale domain, overriding the domain property. This property is only intended for use with scales having continuous domains. Domain can also takes an object defining a field or encoding of a parameter that interactively determines the scale domain.Sets the maximum value in the scale range, overriding the range property or the default range. This property is only intended for use with scales having continuous ranges. By default, Vega-Lite use the following scale types for the following data types and encoding channels: By default, Vega-Lite uses "linear" scales for quantitative fields and uses "time" scales for temporal fields for all encoding channels. Default value: true for unbinned quantitative fields without explicit domain bounds; false otherwise. Extending the domain so that it starts and ends on nice round values. This method typically modifies the scale’s domain, and may only extend the bounds to the nearest round value. Nicing is useful if the domain is computed from data and may be irregular. For example, for a domain of [0.201479…, 0.996679…], a nice domain might be [0.2, 1.0].

Continuous scales map a continuous domain (numbers or dates) to a continuous output range (pixel locations, sizes, colors). Supported continuous scale types for quantitative fields are "linear", "log", "pow", "sqrt", and "symlog". Meanwhile, supported continuous scale types for temporal fields are "time", "utc", and "symlog". For discrete and discretizing scales, an array of desired output values or an object with a field property representing the range values. For example, if a field color contains CSS color names, we can set range to {field: "color"}. In addition to type, domain, and range, continuous scales support the following properties: PropertyConstant domain for temporal fields can be a two-element array with minimum and maximum values, in the form of either timestamps or the DateTime definition objects. For temporal fields with time and utc scales, the nice value can be a string indicating the desired time interval. Legal values are "millisecond", "second", "minute", "hour", "day", "week", "month", and "year". Alternatively, time and utc scales can accept an object-valued interval specifier of the form {"interval": "month", "step": 3}, which includes a desired number of interval steps. Here, the domain would snap to quarter (Jan, Apr, Jul, Oct) boundaries. If true, rounds numeric output values to integers. This can be helpful for snapping to the pixel grid. To combine (union) specified constant domain with the field’s values, domain can be an object with a unionWith property that specify constant domain to be combined. For example, domain: {unionWith: [0, 100]} for a quantitative scale means that the scale domain always includes [0, 100], but will include other values in the fields beyond [0, 100].

Vega-Lite automatically creates scales for fields that are mapped to position and mark property channels. To customize the scale of a field, users can provide a scale object as a part of the field definition to customize scale properties (e.g., type, domain, and range). // A Single View or a Layer Specification A string value "unaggregated", if the input field is aggregated, to indicate that the domain should include the raw data values prior to the aggregation. Linear scales ( "linear") are quantitative scales scales that preserve proportional differences. Each range value y can be expressed as a linear function of the domain value x: y = mx + b. Power Scales Discretizing Scales – mapping continuous domains to discrete output ranges "bin-ordinal", "quantile", "quantize" and "threshold".

Focus on input box

For continuous scales, expands the scale domain to accommodate the specified number of pixels on each of the scale range. The scale range must represent pixels for this parameter to function as intended. Padding adjustment is performed prior to all other adjustments, including the effects of the zero, nice, domainMin, and domainMax properties.

Sets the minimum value in the scale range, overriding the range property or the default range. This property is only intended for use with scales having continuous ranges. A common use case for the domain property is to limit, for example, the x range of values to include in a plot. However, setting the domain property alone is insufficient to achieve the desired effect. Example: Customizing Domain for a Time Scale The range of the scale represents the set of output visual values. Vega-Lite automatically determines the default range for each encoding channel using the following rules: Channels The interpolation method for range values. By default, a general interpolator for numbers, dates, strings and colors (in HCL space) is used. For color ranges, this property allows interpolation in alternative color spaces. Legal values include rgb, hsl, hsl-long, lab, hcl, hcl-long, cubehelix and cubehelix-long (‘-long’ variants use longer paths in polar coordinate spaces). If object-valued, this property accepts an object with a string-valued type property and an optional numeric gamma property applicable to rgb and cubehelix interpolators. For more, see the d3-interpolate documentation. Null[] | String[] | Number[] | Boolean[] | DateTime[] | ExprRef[] | String | ParameterExtent | DomainUnionWith | ExprRef

Default value: true for x and y channels if the quantitative field is not binned and no custom domain is provided; false otherwise. Discrete Scales – mapping discrete domains to discrete ( "ordinal") or continuous ( "band" and "point") output ranges. Besides the scale property of each encoding channel, the top-level configuration object ( config) also provides scale config ( config: {scale: {...}}) for setting default scale properties for all scales. Sets the minimum value in the scale domain, overriding the domain property. This property is only intended for use with scales having continuous domains. A two-element array with minimum and maximum values. To create a diverging scale, this two-element array can be combined with the domainMid property.