How to create a multi-series (line) chart with scala-chart -

i came across scala-chart, nice wrapper using jfreechart in scala. has several utility classes generating charts minimal effort.

what best way generate line chart multiple series using scala-chart?

in scala-chart there several different ways create multi-series line chart. way use depends on how create dataset (including ways work legacy jfreechart code):

• (for comparison) create single-series line chart:

  val series = (x <- 1 5) yield (x,x*x) val chart = xylinechart(series) 

• build multi-series line chart entirely scala collections (this way recommend because idiomatic):

  val names: list[string] = "series a" :: "series b" :: nil  val data = {   name <- names   series = (x <- 1 5) yield (x,util.random.nextint(5)) } yield name -> series  val chart = xylinechart(data) 

• from collection of xyseries objects:

  val names: list[string] = "series a" :: "series b" :: nil  def randomseries(name: string): xyseries =   list.tabulate(5)(x => (x,util.random.nextint(5))).toxyseries(name)  val data = (name <- names) yield randomseries(name)  val chart = xylinechart(data) 

• explicitly create xyseriescollection object:

  def data: xyseriescollection = ??? val chart = xylinechart(data) 

these simple snippets should illustrate how data creation possible , of time boils down 1 of these ways.

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the current implementation (as of 0.4.0) work in way that:

• all chart factories accept arbitrary data object of type a and
• in addition accept implicit -- type class toxydataset[a] -- converts arbitrary data of type a respective dataset factory based on
• in case of xy charts there default converters xyseries, xyseriescollection, coll[xyseries] (where coll scala standard library collection), coll[(a,b)] , coll[(a,coll[(b,c)])]

this way chart factories extendable , can used data instances of custom types -- have write own conversion type class instances custom types.