Tributary inlet

_.md

[ Launch: Tributary inlet ] 5760526 by trinary

config.json

{"description":"Tributary inlet","endpoint":"","display":"svg","public":true,"require":[],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"fullscreen":false,"play":false,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"period","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01}

inlet.js

var n = 243,
    duration = 750,
    now = new Date(Date.now() - duration),
    count = 0,
    data = d3.range(n).map(function() { return 0; });
    data1 = d3.range(n).map(function() { return 0; });

var margin = {top: 6, right: 0, bottom: 20, left: 40},
    width = 960 - margin.right,
    height = 120 - margin.top - margin.bottom;

var x = d3.time.scale()
    .domain([now - (n - 2) * duration, now - duration])
    .range([0, width]);

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

var line = d3.svg.line()
    .interpolate("basis")
    .x(function(d, i) { return x(now - (n - 1 - i) * duration); })
    .y(function(d, i) { return y(d); });
var line1 = d3.svg.line()
    .interpolate("basis")
    .x(function(d, i) { return x(now - (n - 1 - i) * duration); })
    .y(function(d, i) { return y(d); });

var svg = d3.select("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .style("margin-left", -margin.left + "px")
  .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);


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

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

var path1 = svg.append("g")
    .attr("clip-path", "url(#clip)")
  .append("path")
    .data([data1])
    .attr("class", "line1");


tick();
function tick() {
  console.log("tick", duration);
  // update the domains
  now = new Date();
  x.domain([now - (n - 2) * duration, now - duration]);
  y.domain([0, d3.max(data.concat(data1))]);

  // push the accumulated count onto the back, and reset the count
  data.push(Math.random());
  data1.push(Math.random());
  count = 0;

  // redraw the line
  svg.select(".line")
      .attr("d", line)
  .style({
    fill: "none",
    stroke: "blue",
    "stroke-width":"2px"
  })
      .attr("transform", null);
  // redraw the line
  svg.select(".line1")
      .attr("d", line)
  .style({
    fill: "none",
    stroke: "blue",
    "stroke-width":"2px"
  })

      .attr("transform", null);
  // slide the x-axis left
  axis.transition()
      .duration(duration)
      .ease("linear")
      .call(x.axis);

  // slide the line left
  var x_val = x(now - (n - 1) * duration)
  path.transition()
      .duration(duration)
      .ease("linear")
      .attr("transform", "translate(" + x_val + ")");

  path1.transition()
      .duration(duration)
      .ease("linear")
      .attr("transform", "translate(" + x_val + ")")

  // pop the old data point off the front
  data.shift();
  data1.shift();

}
setInterval(tick,duration);