scalaplotlib

ScalaPlotLib is a small, type-oriented library for creating plots. It wraps JFreeChart in a (hopefully) nice API. It's intended for easily creating decent plots in REPL and notebook environments, and supports Apache Spark out-of-the-box (don't worry - it's a provided dependency, so if you don't use it, it won't affect you!)

Here's a quick example to give you an idea of how it's used:

// some fake data
private val data = Stream.iterate((0, 0.0, 0.0)) {
  case (x, y1, y2) => (x + 1, y1 + nextGaussian(), y2 + nextGaussian())
}.take(100).toSeq

Chart("Line", Line)
  .data(data)
  .domain("X")(_._1)
  .rangeAxis("Y")
  .range("Y1")(_._2)
  .range("Y2")(_._3)
  .show()

There is a whole page of examples, and documentation is forthcoming!

TODO

• Documentation!
• Publish to Sonatype
• More plots (some of these will be easy, others won't)
  • Time series, Gantt, and waterfall plots (using Date and java.time._ domains)
  • Pie charts (I never use them, but it's obligatory!)
  • 3D surface plots (not supported by JFreeChart, but we can add it here!)
  • Bubble charts
  • Density plots (density blocks are supported by JFC, but we can add better ones even)
  • Candlestick / OLHC
• Better stat plot API / aggregation API

See Also

• Vegas - a comprehensive plotting library using a JavaScript (vega-lite + D3) front-end
• scala-chart - another Scala layer over JFreeChart, but with slightly different goals
• scalaplot - an XY-focused plotting library supporting multiple front-ends

License

TBD. JFreeChart is LGPL3, JFreeSVG is GPL3. I'd like to do MIT or Apache, but I have to figure out if I'm allowed to given the (binary, unpackaged) dependencies on JFree libraries.