{-# LANGUAGE OverloadedStrings #-} {-| Module : Graphics.Vega.VegaLite.Scale Copyright : (c) Douglas Burke, 2018-2020 License : BSD3 Maintainer : dburke.gw@gmail.com Stability : unstable Portability : OverloadedStrings Scale-related functionality. -} module Graphics.Vega.VegaLite.Scale ( ScaleDomain(..) , ScaleRange(..) , ScaleNice(..) -- not for external export , scaleDomainSpec , scaleNiceSpec ) where import qualified Data.Text as T import Data.Aeson ((.=), object, toJSON) import Graphics.Vega.VegaLite.Foundation ( Channel , FieldName , fromT , channelLabel ) import Graphics.Vega.VegaLite.Specification ( VLSpec , SelectionLabel ) import Graphics.Vega.VegaLite.Time ( DateTime , TimeUnit , dateTimeProperty , timeUnitSpec ) {-| Describes the scale domain (type of data in scale). For full details see the . -} data ScaleDomain = DNumbers [Double] -- ^ Numeric values that define a scale domain. | DStrings [T.Text] -- ^ String values that define a scale domain. | DDateTimes [[DateTime]] -- ^ Date-time values that define a scale domain. | DSelection SelectionLabel -- ^ Scale domain based on a named interactive selection. -- See also 'DSelectionField' and 'DSelectionChannel', which should -- be used when a selection is -- [projected](https://vega.github.io/vega-lite/docs/project.html) -- over multiple fields or encodings. -- -- In @0.7.0.0@ the argument type was changed to @SelectionLabel@ -- (which is a type synonym for @Text@). | DSelectionField SelectionLabel FieldName -- ^ Use the given selection /and/ associated field, when the selection -- is projected over multiple fields or encodings. -- -- @since 0.7.0.0 | DSelectionChannel SelectionLabel Channel -- ^ Use the given selection /and/ associated encoding, when the selection -- is projected over multiple fields or encodings. -- -- @since 0.7.0.0 | DUnionWith ScaleDomain -- ^ Combine the domain of the data with the provided domain. -- -- The following example will use a range of at least 0 to 100, -- but this will be increased if the data (either initially or -- via any updates to the Vege-Lite visualization) exceeds this: -- -- @'Graphics.Vega.VegaLite.PScale' ['Graphics.Vega.VegaLite.SDomain' (DUnionWith ('DNumbers' [0, 100]))]@ -- -- Note that 'DUnionWith' should not be nested, but this -- is not enforced by @hvega@. -- -- @since 0.6.0.0 | Unaggregated -- ^ Indicate that a domain of aggregated data should be scaled to -- the domain of the data prior to aggregation. scaleDomainSpec :: ScaleDomain -> VLSpec scaleDomainSpec (DNumbers nums) = toJSON (map toJSON nums) scaleDomainSpec (DDateTimes dts) = toJSON (map (object . map dateTimeProperty) dts) scaleDomainSpec (DStrings cats) = toJSON (map toJSON cats) scaleDomainSpec (DSelection selName) = object ["selection" .= selName] scaleDomainSpec (DSelectionField selName field) = object [ "selection" .= selName , "field" .= field ] scaleDomainSpec (DSelectionChannel selName ch) = object [ "selection" .= selName , "encoding" .= channelLabel ch ] scaleDomainSpec (DUnionWith sd) = object ["unionWith" .= scaleDomainSpec sd] scaleDomainSpec Unaggregated = "unaggregated" {-| Describes the way a scale can be rounded to \"nice\" numbers. For full details see the . -} data ScaleNice = NMillisecond -- ^ Nice time intervals that try to align with rounded milliseconds. | NSecond -- ^ Nice time intervals that try to align with whole or rounded seconds. | NMinute -- ^ Nice time intervals that try to align with whole or rounded minutes. | NHour -- ^ Nice time intervals that try to align with whole or rounded hours. | NDay -- ^ Nice time intervals that try to align with whole or rounded days. | NWeek -- ^ Nice time intervals that try to align with whole or rounded weeks. | NMonth -- ^ Nice time intervals that try to align with whole or rounded months. | NYear -- ^ Nice time intervals that try to align with whole or rounded years. | NInterval TimeUnit Int -- ^ \"Nice\" temporal interval values when scaling. | IsNice Bool -- ^ Enable or disable nice scaling. | NTickCount Int -- ^ Desired number of tick marks in a \"nice\" scaling. scaleNiceSpec :: ScaleNice -> VLSpec scaleNiceSpec NMillisecond = fromT "millisecond" scaleNiceSpec NSecond = fromT "second" scaleNiceSpec NMinute = fromT "minute" scaleNiceSpec NHour = fromT "hour" scaleNiceSpec NDay = fromT "day" scaleNiceSpec NWeek = fromT "week" scaleNiceSpec NMonth = fromT "month" scaleNiceSpec NYear = fromT "year" scaleNiceSpec (NInterval tu step) = object ["interval" .= timeUnitSpec tu, "step" .= step] scaleNiceSpec (IsNice b) = toJSON b scaleNiceSpec (NTickCount n) = toJSON n {-| Describes a scale range of scale output values. For full details see the . For color scales you can also specify a color [scheme](https://vega.github.io/vega-lite/docs/scale.html#scheme) instead of range. Any directly specified range for @x@ and @y@ channels will be ignored. Range can be customized via the view's corresponding [size](https://vega.github.io/vega-lite/docs/size.html) ('Graphics.Vega.VegaLite.width' and 'Graphics.Vega.VegaLite.height') or via range steps and paddings properties (e.g. 'Graphics.Vega.VegaLite.SCRangeStep') for band and point scales. -} data ScaleRange = RNumbers [Double] -- ^ For [continuous scales](https://vega.github.io/vega-lite/docs/scale.html#continuous), -- a two-element array indicating minimum and maximum values, or an array with more than -- two entries for specifying a -- [piecewise scale](https://vega.github.io/vega-lite/docs/scale.html#piecewise). | RNumberLists [[Double]] -- ^ A scale range comprising of numeric lists, such as custom dash styles for -- the 'Graphics.Vega.VegaLite.strokeDash' channel encoding. -- -- @since 0.6.0.0 | RStrings [T.Text] -- ^ Text scale range for discrete scales. | RName T.Text -- ^ Name of a [pre-defined named scale range](https://vega.github.io/vega-lite/docs/scale.html#range-config) -- (e.g. \"symbol\" or \"diverging\"). {- TODO: * TickCount accepts number or TimeInterval but this is a subset of ScaleNice -}