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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

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.

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Null[] | String[] | Number[] | Boolean[] | DateTime[] | ExprRef[] | String | ParameterExtent | DomainUnionWith | ExprRef Discrete Scales – mapping discrete domains to discrete ( "ordinal") or continuous ( "band" and "point") output ranges. Default value: true for x and y channels if the quantitative field is not binned and no custom domain is provided; false otherwise. Sets the minimum value in the scale domain, overriding the domain property. This property is only intended for use with scales having continuous domains.

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. Any directly specified range for x and y channels will be ignored. Range can be customized via the view’s corresponding size ( width and height). By default, Vega-Lite use the following scale types for the following data types and encoding channels:For continuous scales, two-element array indicating minimum and maximum values, or an array with more than two entries for specifying a piecewise scale. 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. 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". In addition to type, domain, and range, continuous scales support the following properties: Property Domain can also takes an object defining a field or encoding of a parameter that interactively determines the scale domain.

Discretizing Scales – mapping continuous domains to discrete output ranges "bin-ordinal", "quantile", "quantize" and "threshold". Sets the maximum value in the scale domain, overriding the domain property. This property is only intended for use with scales having continuous domains. Default value: true for unbinned quantitative fields without explicit domain bounds; false otherwise. 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"}. To customize range values, users can directly specify range or specify the special scheme property for ordinal and continuous color scales. PropertyInserts 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. Constant 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. Continuous Scales – mapping continuous domains to continuous output ranges ( "linear", "pow", "sqrt", "symlog", "log", "time", "utc".

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 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]. 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.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]. 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. 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.