first commit

.gitignore

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+node_modules/

index.js

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+
+var Stream = require('stream')
+
+var d3 = require('d3')
+var through = require('through')
+var parse = require('event-stream').parse
+
+var livebezier = function(opts) {
+
+  var stream = new Stream
+  stream.writable = true
+
+  var svg = d3
+    .select('body')
+    .append('div')
+      .attr('id', opts.id)
+      .append('svg')
+
+  svg
+    .attr('id', 'background')
+    .attr('width', opts.clientWidth)
+    .attr('height', opts.clientHeight)
+
+  var p = svg.append('path')
+  p.style('fill', 'none')
+  p.style('stroke', opts.lineColor)
+  p.style('stroke-width', opts.lineWidth)
+
+  stream.vectors = []
+
+  function write(data) {
+
+    if (typeof data[0] !== 'number') {
+      for (var i = 0, l = data.length; i < l; i++) {
+        stream.vectors.push(data[i])
+      }
+    }
+    else {
+      stream.vectors.push(data)
+    }
+
+    var x = d3
+      .scale
+      .linear()
+      .domain([0, opts.domainWidth])
+      .range([0, opts.clientWidth])
+    ;
+
+    var y = d3
+      .scale
+      .linear()
+      .domain([0, opts.domainHeight])
+      .range([opts.clientHeight, 0])
+    ;
+
+    p
+      .datum(stream.vectors)
+      .attr('d', d3
+        .svg
+        .line()
+        .interpolate('basis')
+        .x(function(d) { return x(d[0]); })
+        .y(function(d) { return y(d[1]); })
+      )
+    ;
+
+    this.queue(d3.select('body').node().innerHTML)
+  }
+
+  return stream
+    .pipe(parse())
+    .pipe(through(write))
+}
+
+module.exports = livebezier

package.json

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+{
+  "name": "live-bezier",
+  "version": "0.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "BSD",
+  "dependencies": {
+    "through": "~2.3.4",
+    "event-stream": "~3.0.16",
+    "d3": "~3.2.7"
+  }
+}

test.js

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+
+var livebez = require('./index')
+var count = 0
+
+
+var opts = {
+  id: 'test',
+  lineColor: '#68bef3',
+  lineWidth: '2px',
+  domainWidth: 50,
+  domainHeight: 1,
+  clientWidth: 500,
+  clientHeight: 100,
+}
+
+var s = livebez(opts)
+
+s.on('data', function(d) {
+  count++
+
+  //
+  // TODO: currently throwing into browser,
+  // should set up a test here to measure correctness
+  //
+  console.log(count, d)
+})
+
+s.write([[0, 0.1], [1, 0.4], [2, 0.6], [3, 0.7]])
+s.write([4, 0.8])
+s.write([5, 0.9])
+s.write([6, 0.5])
+s.write([10, 1])
+s.write([10, 0.1])
+
+s.write([[11, 0.1], [12, 0.6], [40, 0.1]])