created by http://livecoding.io/3411676

README.md

View this code at http://livecoding.io/8646864

options.json

{
    "libraries": [
        "d3"
    ],
    "mode": "javascript",
    "layout": "fullscreen mode (vertical)",
    "resolution": "reset"
}

water.css

svg {
  font: 10px sans-serif;
}
.axis line {
  stroke: #000;
  shape-rendering: crispEdges;
}
.trip path {
  fill: none;
  stroke-width: 1.5px;
}
.trip path { stroke: rgb(192,62,29); }
.axis path, .axis line {
    fill: none;
    stroke: #000;
    shape-rendering: crispEdges;
}

water.html

<!-- html goes here -->
<svg></svg>

water.js

var margin = {top: 20, right: 30, bottom: 20, left: 100},
    width = 600 - margin.left - margin.right,
    height = 600 - margin.top - margin.bottom

var x = d3.scale.linear()
  .domain([0, 100])
  .range([0, width])

var y = d3.scale.linear()
  .domain([0, 100])
  .range([0, height])

var xAxis = d3.svg.axis().scale(x)
var yAxis = d3.svg.axis().scale(y)

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

svg.append("defs").append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("y", - margin.top)
    .attr("width", width)
    .attr("height", height + margin.top + margin.bottom)

d3.json("water.json", function(timetable) {

  function findValue(value, where, old) {
    function linearInterpolation(from, to, value) {
      var x1 = from[0], x2 = to[0], y1 = from[1], y2 = to[1]
      var m = (y2 - y1) / (x2 - x1), b = y1 - m * x1
      return m * value + b
    }
    if (where.length == 0) return undefined
    var head = where[0]
    if (head[0] == value) return { found: head[1], rest: where }
    else if (head[0] > value) return { found: linearInterpolation(old, head, value), rest: where }
    return findValue(value, where.slice(1), head)
  }


  function normalise(trip, refTrip, newTrip) {
    newTrip = newTrip || []
    if (trip.length == 0) return newTrip
    var head = trip[0]
    var lookup = findValue(head[0], refTrip)
    var result = [ head[0], head[1] - lookup.found ] // distance, difference
    return normalise(trip.slice(1), lookup.rest, newTrip.concat( [result] ))
  }

  var ref = [ [0, 0], [20, 5], [35, 25], [50, 30] ]
  var trip = [ [0, 0], [20, 10], [35, 27], [50, 30] ]
  var normalised = normalise(trip, ref)
  console.log("normalised", normalise(trip, ref))

  var trips = normalised.map(function(step) {
    return { x: step[0], y: step[1] }
  })
  
  var trip = svg.append("g")
      .attr("class", "trip")
      .attr("clip-path", "url(#clip)")
    .selectAll("g")
      .data(trips)
    .enter().append("g")
      .attr("class", function(d) { return "line" })

  var line = d3.svg.line()
      .x(function(d) { return x(d.x) })
      .y(function(d) { return y(d.y) })

  trip.append("path")
      .attr("class", "trip")
      .attr("d", function(d) { return line(d) })

  trip.selectAll("circle")
      .data(function(d) { return d })
    .enter().append("circle")
      .attr("transform", function(d) {
        return "translate(" + x(d.x) + "," + y(d.y) + ")" })
      .attr("r", 2);
 /*
  svg.append("g")
      .attr("class", "x top axis")
      .call(xAxis.orient("top"))

  svg.append("g")
      .attr("class", "y left axis")
      .call(yAxis.orient("left")) */ 
})

water.json

{
  "runTypes": {
    "RT1": [ [0, 0], [20, 5], [35, 25], [50, 30] ],
    "RT2": [ [50, 0], [65, 5], [80, 25], [100, 30] ],
    "RT1X": [ [20, 0], [35, 20], [50, 25] ],
    "RT2X": [ [50, 0], [65, 5], [80, 25] ]
  },
  "services": {
    "S1": [ ["01", "10:05", "RT1X"], ["02", "10:30", "RT2"],  ["03", "11:00", "RT1"], ["04", "11:30", "RT2X"] ],
    "S2": [ ["05", "10:15", "RT1X"], ["06", "10:40", "RT2"],  ["07", "11:10", "RT1"], ["08", "11:40", "RT2X"] ],
    "S3": [ ["09", "10:25", "RT1X"], ["10", "10:50", "RT2"],  ["11", "11:20", "RT1"], ["12", "11:50", "RT2X"] ],
    "S4": [ ["13", "10:35", "RT1X"], ["14", "11:00", "RT2"],  ["15", "11:30", "RT1"], ["16", "12:00", "RT2X"] ],
    "S5": [ ["17", "10:45", "RT1X"], ["18", "11:10", "RT2"],  ["19", "11:40", "RT1"], ["20", "12:10", "RT2X"] ],
    "S6": [ ["21", "10:55", "RT1X"], ["22", "11:20", "RT2"],  ["23", "11:50", "RT1"], ["24", "12:20", "RT2X"] ]
  },
  "updates": [
    {
      "trip": [ "S1", "01" ],
      "report": [ [20, 2], [35, 25] ]
    }
  ]
}