Overview

janet-plplot is a wrapper library for the PLplot plotting library for the Janet programming language.

Installation

Using the jpm package management tool

jpm install https://github.com/chamaeleon/janet-plplot.git

The PLplot library requires installation as well along with drivers for GUI display of graphs, separately from installing this wrapper library. On Ubuntu 24.04, for example, libplplot17, plus probably one or more of plplot-driver-cairo, plplot-driver-qt, plplot-driver-wxwidgets, and plplot-driver-xwin is recommended.

Example usage

Given the following code in a Janet source file results in the image below (it was generated using the xcairo driver)

(import plplot/plplot :as pl)

(def N 100)
(def xs @[])
(def ys @[])

(each i (range (inc N))
  (let [x (/ i N)
        y (* N x x)]
    (array/push xs x)
    (array/push ys y)))

(pl/plparseopts (dyn *args*))
# Specify a device here, or use the -dev command line option
# (pl/plsdev "xcairo")
(pl/plinit)
(pl/plenv 0 1 0 N 0 0)
(pl/pllab "x" (string/format "y=%d x#u2#d" N) "Simple PLplot Demo")
(pl/plline xs ys)
(pl/plend)