D3.js sparkline

by dekkard

HTML

<script src="http://d3js.org/d3.v3.min.js"></script>

CSS

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: auto;
  position: relative;
  width: 960px;
}

text {
  font: 10px sans-serif;
}

form {
  position: absolute;
  right: 10px;
  top: 10px;
}

JavaScript

var random = d3.random.normal(500, 200),
    data = d3.range(100).map(random);

console.log("data: " + data);

var margin = {top: 20, right: 20, bottom: 20, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.linear()
    //.domain([0, data[data.length -1]])
    .domain([0, data.length -1])
    .range([0, width]);

var y = d3.scale.linear()
    .domain([-1, 1000])
    .range([height, 0]);

var line = d3.svg.line()
    //.x(function(d, i) { return x(i); })
    .x(function(d, i) { 
        console.log("D is " + d  + ", X is " + (new Date).getSeconds() );
        return (new Date).getSeconds(); 
    })
    .y(function(d, i) { 
        console.log("D is " + d + ", Y is " + y(d));
        return y(d); 
    });

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

svg.append("defs").append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + y(0) + ")")
    .call(d3.svg.axis().scale(x).orient("bottom"));

svg.append("g")
    .attr("class", "y axis")
    .attr("transform", "translate(0," + x(0)+")")
    .call(d3.svg.axis().scale(y).orient("left"));

var path = svg.append("g")
    .attr("clip-path", "url(#clip)")
    .append("path")
    .datum(data)
    .attr("class", "line")
    .attr("d", line);

redraw();

function redraw() {
  path
      .attr("d", line)
      .attr("transform", null)
      .transition()
      .duration(2000)
      .ease("linear")
      .attr("transform", "translate(" + x(1) + ",0)")
      .each("end", redraw);

  data.shift();
}