Simple interface to d3 (http://d3js.org) and other JavaScript libraries for chart making.

This package for Julia provides a simple interface for using d3 syntax within julia.

It isn't very clever, basically it takes a d3 command like:

d3.selectAll("p").style("color", "white")

And turns it into a julia call like:

d3.selectAll("p").style("color", "white")

(Only after)

using DThree
d3 = D3()

Okay, you might guess the style. This just pieces together a string of JavaScript that will get inserted into a web page.

The implementation is pretty stupid, it just makes fields named after the main methods and creates a function when the object is instantiated. The functions return a D3 instance so they can be chained, as above.

If the field isn't present, then the interface can look one of two ways:

d3[:selectAll]("p")._("color", "white") ## two ways [:symbol](args...) or _("meth", args...)

By default, strings are quoted. To stop that, wrap the string in asis (like R's I operator). This is necessary when the argument refers to a JavaScript object.

using DThree
style = """
.chart div {
  font: 10px sans-serif;
  background-color: steelblue;
  text-align: right;
  padding: 3px;
  margin: 1px;
  color: white;
  }
"""
  
w = figure()
DThree.empty_page(w, style=style) # loads D3 libraries

d3 = D3()
d3.select("body").append("div").attr("class", "chart") |> js

data = [4,8,16,23,42]

d3.select(".chart").selectAll("div").
    data(data).
	  enter().append("div").
       style("width", asis"""function(d) { return d * 10 + "px"; }""").
         text(asis"""function(d) { return d; }""")  |> js
	

The js call comes from Blink, as does the figure object.

This package also borrows the figure manipulation tools of Immerse and the HTML windows of Blink to create canvases to manipulate. The basic idea would follow from this example

using DThree, Plots; plotly()
w = figure()
Blink.title(w, "title")
plot(sin, 0, 2pi)
plot!(cos)