Continuous Scales – mapping continuous domains to continuous output ranges ( "linear", "pow", "sqrt", "symlog", "log", "time", "utc". 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. 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. Default value: true for x and y channels if the quantitative field is not binned and no custom domain is provided; false otherwise. Default value: For continuous scales, derived from the scale config’s continuousPadding. For band and point scales, see paddingInner and paddingOuter. By default, Vega-Lite sets padding such that width/height = number of unique values * step.

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"}. Sets the minimum value in the scale domain, overriding the domain property. This property is only intended for use with scales having continuous domains. If true, rounds numeric output values to integers. This can be helpful for snapping to the pixel grid. 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 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.By default, Vega-Lite uses "linear" scales for quantitative fields and uses "time" scales for temporal fields for all encoding channels. Domain can also takes an object defining a field or encoding of a parameter that interactively determines the scale domain. For continuous scales, two-element array indicating minimum and maximum values, or an array with more than two entries for specifying a piecewise scale.

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". Power scales ( "pow") are quantitative scales scales that apply an exponential transform to the input domain value before the output range value is computed. Each range value y can be expressed as a polynomial function of the domain value x: y = mxBesides 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. To customize range values, users can directly specify range or specify the special scheme property for ordinal and continuous color scales. Property 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. Default value: true for unbinned quantitative fields without explicit domain bounds; false otherwise.