bradoyler · March 16, 2020 01:27
diff --git a/README.md b/README.md
diff --git a/bundle.js b/bundle.js
 'use strict';

 var landingColor = '#fe761e';
 var takeOffColor = '#3081dd';
 var lineColor = '#5297ee';
 var fps = 40;
 var curveFactor = 40;
 var speed = 0.9; // between 0 & 1 
 var drawLines = true;
 var batchSize = 12;


 function initMap(selector) {
  var airportMap = {};
  var $flightmap = d3.select(selector).node();
  var width = 950;
  var height = 500;
  var mapScale = 1050;
  var projection = d3.geoAlbersUsa()
  .scale(mapScale).translate([width / 2, height / 2]);

  var path = d3.geoPath().pointRadius(1.2).projection(projection);

  var svg = d3.select(selector).append('svg')
  .attr('preserveAspectRatio', 'xMidYMid')
  .attr('viewBox', '0 0 ' + width + ' ' + height)
  .attr('width', width).attr('height', height);

  var canvasEl = d3.select(selector)
  .append('canvas')
  .attr('style', 'position:absolute; top:0; left:0')
  .attr('width', width)
  .attr('height', height);

  var canvas = canvasEl.node();
  var ctx = canvas.getContext('2d');
  var points = [];
  var batchCount = 0;

  function animate() {
    draw();
    // request another frame
    setTimeout(function () {
      window.requestAnimationFrame(animate);
    }, 1000 / fps);
  }

  // draw the current frame based on sliderValue
  function draw() {
    ctx.clearRect(0, 0, canvas.width, canvas.height);

    for (var i = 0; i < points.length; i++) {
      if (i > batchCount) {
        // for progressive animation
        batchCount += batchSize;
        break;
      }

      var point = points[i],
          start = point.start,
          end = point.end,
          progress = point.progress;

      var wayPoint = helpers.getWaypointXY(start, end, 90);
      var controlPt = { x: wayPoint.x, y: wayPoint.y - curveFactor };
      ctx.beginPath();
      var percentFactor = progress / 100;
      var xy = helpers.getQuadraticBezierXY(start, controlPt, end, percentFactor);
      point.progress += speed;

      // when to draw lines
      if (drawLines && progress < 101) {
        helpers.drawLine(ctx, start, end, controlPt, lineColor);
      }

      // when to draw dots
      if (progress > 0 && progress < 10) {
        helpers.drawDot(ctx, xy, 2.5, takeOffColor, takeOffColor);
      } else if (progress < 90) {
        helpers.drawDot(ctx, xy, 4);
      } else if (progress > 90 && progress < 101) {
        helpers.drawDot(ctx, xy, 2.5, landingColor, landingColor);
      } else {
        point.progress = 0; // reset progress
      }
    }
  }

  function ready(error, topo, airports) {
    if (error) throw error;

    svg.append('g').attr('class','states').selectAll('path')
      .data(topojson.feature(topo, topo.objects.states).features).enter()
      .append('path').attr('d', path);

    svg.append('g').attr('class', 'airports').selectAll('path')
      .data(topojson.feature(airports, airports.objects.airports).features).enter()
      .append('path').attr('id', function (d) {
      return d.id;
    }).attr('d', path);

    var geos = topojson.feature(airports, airports.objects.airports).features;
    geos.forEach(function (geo) {
      airportMap[geo.id] = geo.geometry.coordinates;
    });

    points = helpers.generatePointsFromMap(airportMap, window.routes, projection);
    animate();
  }

  d3.queue()
    .defer(d3.json, 'https://nodeassets.nbcnews.com/cdnassets/projects/2017/08/airplane-mode/us-states.json')
    .defer(d3.json, 'https://nodeassets.nbcnews.com/cdnassets/projects/2017/08/airplane-mode/us-airports-major.topo.json')
    .await(ready);
  
 }
diff --git a/helpers.js b/helpers.js
 window.helpers = {}

 helpers.drawDot = function drawDot(ctx, point, size) {
  var fill = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : '#ccc';
  var stroke = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : '#ccc';

  ctx.fillStyle = fill;
  ctx.strokeStyle = stroke;
  ctx.lineWidth = 0.2;
  ctx.beginPath();
  ctx.arc(point.x, point.y, size, 0, Math.PI * 2, false);
  // var p = new window.Path2D('M10 10 h 80 v 80 h -80 Z')
  ctx.closePath();
  ctx.fill();
  ctx.stroke();
 }

 helpers.drawLine = function drawLine(ctx, start, end, controlPt, color) {
  var lineWidth = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 0.2;

  ctx.moveTo(start.x, start.y);
  ctx.quadraticCurveTo(controlPt.x, controlPt.y, end.x, end.y); // curved lines
  // ctx.lineTo(end.x, end.y) // straight lines
  ctx.lineJoin = 'round';
  ctx.lineCap = 'round';
  ctx.strokeStyle = color;
  ctx.lineWidth = lineWidth;
  ctx.stroke();
 }

 helpers.generatePointsFromMap = function generatePointsFromMap(map, routes, projection) {
  var points = [];
  routes.forEach(function (route, idx) {
    var origin = map[route[0]];
    var dest = map[route[1]];
    if (origin && dest && origin.length && dest.length) {
      var startXY = projection(origin) || [0, 0];
      var endXY = projection(dest) || [0, 0];
      var start = { x: startXY[0], y: startXY[1] };
      var end = { x: endXY[0], y: endXY[1] };
      var name = route;
      var onMap = end.x > 0 && start.x > 0;
      if (onMap) {
        points.push({ idx: idx, name: name, start: start, end: end, progress: 0 });
      }
    }
  });
  console.log('points:', points.length)
  return points;
 }

 helpers.getWaypointXY = function getWaypointXY(startPoint, endPoint, percent) {
  var factor = percent / 100;
  var x = startPoint.x + (endPoint.x - startPoint.x) * factor;
  var y = startPoint.y + (endPoint.y - startPoint.y) * factor;
  return { x: x, y: y };
 }

 // quadratic bezier: percent is 0-1
 helpers.getQuadraticBezierXY = function getQuadraticBezierXY(startPt, controlPt, endPt, percent) {
  var x = Math.pow(1 - percent, 2) * startPt.x + 2 * (1 - percent) * percent * controlPt.x + Math.pow(percent, 2) * endPt.x;
  var y = Math.pow(1 - percent, 2) * startPt.y + 2 * (1 - percent) * percent * controlPt.y + Math.pow(percent, 2) * endPt.y;
  return { x: x, y: y };
 }
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.10.2/d3.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/3.0.2/topojson.min.js"></script>
  <script src="routes.js"></script>
  <script src="helpers.js"></script>
  <script src="bundle.js"></script>
 <style>
 body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    
 .states {
  fill: #696969;
  stroke: #6cb0e0;
  stroke-width: 0.5px;
  stroke-linecap: round;
  stroke-linejoin: round;
 }

 .airports {
  fill: #000;
  stroke: transparent;
  stroke-width: 0.5px;
  stroke-linecap: round;
  stroke-linejoin: round;
 }

 </style>
 </head>

 <body>
  <div id="flightMap"></div>
  <div>Blue dots = takeoff
  <div>Orange dots = landing</div>
  <script>
    initMap('#flightMap')
  </script>
 </body>
diff --git a/routes.js b/routes.js

 window.routes = [["LAS", "MSY"], ["SPI", "IAD"], ["MSP", "IND"], ["CLT", "DAB"], ["CLE", "PVD"], ["CLE", "DTW"], ["SYR", "ATL"], ["MSY", "DFW"], ["ORD", "CAE"], ["IAH", "LAS"], ["ATL", "SAN"], ["MSP", "FNT"], ["PIR", "JAX"], ["BOS", "MYR"], ["CVG", "MDT"], ["SYR", "MCO"], ["DFW", "MSN"], ["DFW", "IAH"], ["PNS", "ATL"], ["VPS", "CVG"], ["CVG", "MCO"], ["CLT", "CVG"], ["BWI", "ABQ"], ["BFL", "FAT"], ["MFR", "RDM"], ["GSP", "ORD"], ["IAH", "PDX"], ["CLE", "ROC"], ["IAH", "TYS"], ["BOI", "PHX"], ["ATL", "PBI"], ["DSM", "PHX"], ["DEN", "SEA"], ["LAS", "FNT"], ["IAD", "DAY"], ["SAT", "MCI"], ["KOA", "LIH"], ["BUR", "RNO"], ["MEM", "MLI"], ["PHL", "STT"], ["ORF", "DTW"], ["IND", "BOS"], ["ATL", "MOB"], ["ATL", "DTW"], ["CMH", "CLT"], ["RNO", "ONT"], ["MSY", "MEM"], ["HPN", "PBI"], ["LEX", "COS"], ["BUR", "PDX"], ["EWR", "MTJ"], ["MSP", "CVG"], ["LAX", "MFR"], ["ACV", "SFO"], ["FNT", "DTW"], ["DEN", "ABQ"], ["AEX", "DFW"], ["MIA", "SFO"], ["ATL", "SBN"], ["LEX", "CVG"], ["OTZ", "ANC"], ["ORD", "VPS"], ["PNS", "MEM"], ["ASE", "RFD"], ["IAD", "AUS"], ["RNO", "PHX"], ["CVG", "ANC"], ["MSY", "SAT"], ["DTW", "AZO"], ["BIL", "SLC"], ["ATL", "PHF"], ["SAN", "AUS"], ["FAT", "SAN"], ["MEM", "SDF"], ["ORD", "MQT"], ["MIA", "ORF"], ["SAT", "CVG"], ["ATL", "MYR"], ["PHL", "PIT"], ["CVG", "DCA"], ["LSE", "MSP"], ["SJC", "LAX"], ["SLC", "JAC"], ["SEA", "BOI"], ["ISP", "MCO"], ["IAH", "MCI"], ["SAN", "HNL"], ["LGA", "FLL"], ["TPA", "CLE"], ["STL", "ABQ"], ["AMA", "ABQ"], ["LAX", "MCI"], ["CMH", "EWR"], ["ICT", "MSP"], ["STT", "CLT"], ["SAV", "IAD"], ["SEA", "BUR"], ["BDL", "IND"], ["ANC", "SEA"], ["ORD", "PHL"], ["IAD", "MDT"], ["DEN", "CRW"], ["ORD", "FSD"], ["SHV", "DTW"], ["TPA", "PHX"], ["RNO", "SJC"], ["TYS", "CVG"], ["IAD", "MIA"], ["PHL", "MSP"], ["PHX", "GEG"], ["PHL", "BUF"], ["BOI", "SFO"], ["LAX", "MTJ"], ["TLH", "FLL"], ["PHL", "LGA"], ["MCI", "PIT"], ["AUS", "BNA"], ["SFO", "PIT"], ["DEN", "ONT"], ["CLT", "LIT"], ["JFK", "ALB"], ["BOS", "MDW"], ["BDL", "ORD"], ["PWM", "CLT"], ["ATL", "LIT"], ["EWR", "PDX"], ["CLE", "CVG"], ["ATL", "ICT"], ["SMF", "ORD"], ["SDF", "EWR"], ["DEN", "IAH"], ["DFW", "DTW"], ["SAN", "STL"], ["DTW", "MCI"], ["EWR", "AVL"], ["TLH", "CLT"], ["SCC", "BRW"], ["SMF", "BUR"], ["ATL", "CAK"], ["LAX", "EWR"], ["CMH", "ICT"], ["ILM", "CLT"], ["ITO", "HNL"], ["CLT", "BOS"], ["FLL", "OAK"], ["ATL", "JAC"], ["FLL", "LAS"], ["ATL", "SJC"], ["LGA", "PHL"], ["SBP", "SLC"], ["DEN", "CYS"], ["BMI", "MCO"], ["ORD", "OAK"], ["BWI", "LIT"], ["BOI", "GEG"], ["DTW", "RIC"], ["SNA", "LAS"], ["SGF", "DTW"], ["SAT", "AMA"], ["DAB", "CVG"], ["SEA", "SIT"], ["MKE", "EWR"], ["PIT", "BWI"], ["ORD", "FCA"], ["FLL", "LAX"], ["STL", "SFO"], ["BOS", "IAD"], ["BQN", "JFK"], ["DTW", "CRW"], ["BQN", "MCO"], ["SGF", "STL"], ["EUG", "LAX"], ["GEG", "PHX"], ["DCA", "XNA"], ["FNT", "ORD"], ["HSV", "MCO"], ["PHF", "ATL"], ["CMH", "GRR"], ["TPA", "DCA"], ["SLC", "CLT"], ["CVG", "CLE"], ["PHX", "LAS"], ["PHX", "MKE"], ["SLC", "ORD"], ["IAH", "SAV"], ["DEN", "MTJ"], ["GRK", "IAH"], ["BOS", "LAX"], ["IAH", "SAN"], ["MKE", "BDL"], ["LGA", "XNA"], ["CVG", "ROA"], ["MDW", "SAT"], ["ROC", "LAS"], ["BNA", "DFW"], ["IAH", "MAF"], ["HOU", "TUL"], ["PHX", "MRY"], ["RSW", "DEN"], ["OKC", "CVG"], ["DEN", "RKS"], ["DEN", "BFL"], ["MCI", "LNK"], ["PHX", "OAK"], ["LGB", "PDX"], ["SEA", "DEN"], ["MFE", "DFW"], ["SLC", "SJC"], ["PDX", "SNA"], ["DAB", "JAX"], ["LAX", "SFO"], ["MFR", "RDD"], ["MSP", "GTF"], ["CVG", "COS"], ["DEN", "LIH"], ["CAE", "MEM"], ["IAH", "DEN"], ["ACK", "EWR"], ["ATL", "MEI"], ["DAY", "DTW"], ["ORD", "EWR"], ["DCA", "BNA"], ["BIL", "PIH"], ["CVG", "PBI"], ["LGA", "PIT"], ["LAN", "MSP"], ["ICT", "DEN"], ["ORD", "CID"], ["IND", "DFW"], ["LAX", "FAT"], ["ICT", "COS"], ["BHM", "SDF"], ["RSW", "ATL"], ["FLL", "IAD"], ["CDC", "LAX"], ["SAN", "LAX"], ["BTR", "DFW"], ["DCA", "RDU"], ["SAN", "BWI"], ["SLC", "FLL"], ["RAP", "TWF"], ["IAD", "ABQ"], ["DCA", "TPA"], ["DFW", "BUR"], ["SNA", "LAX"], ["PHX", "OKC"], ["ELP", "TUS"], ["SFO", "TWF"], ["CWA", "ORD"], ["XNA", "SGF"], ["JAN", "BWI"], ["CRW", "ORD"], ["BDL", "GRB"], ["BWI", "MIA"], ["SJC", "SAN"], ["IND", "MDW"], ["IAD", "BUF"], ["ACY", "ATL"], ["LIH", "HNL"], ["DFW", "MEM"], ["DEN", "DRO"], ["MSY", "CMH"], ["IAH", "BWI"], ["PBI", "CMH"], ["BUF", "JFK"], ["SLC", "PSC"], ["MCO", "JAX"], ["CLT", "ORF"], ["RNO", "IAH"], ["HNL", "DEN"], ["TYS", "MCO"], ["CLE", "BHM"], ["SLC", "OKC"], ["DSM", "IAH"], ["SDF", "SLC"], ["SYR", "CVG"], ["ORF", "MDW"], ["OKC", "DFW"], ["FAI", "SLC"], ["DEN", "ROC"], ["CIC", "FAT"], ["JFK", "SRQ"], ["CLE", "IAD"], ["JFK", "OAK"], ["TPA", "FNT"], ["XNA", "LAX"], ["FSD", "SLC"], ["GJT", "LAX"], ["DEN", "FAT"], ["DEN", "ELP"], ["BWI", "ALB"], ["RDU", "DEN"], ["SEA", "MCI"], ["CLT", "MEM"], ["PSP", "SFO"], ["SAT", "MEM"], ["PHX", "BUR"], ["BUR", "PMD"], ["MSP", "CLE"], ["BDL", "LAS"], ["SLC", "MSY"], ["ORD", "ELP"], ["SJC", "EWR"], ["ATL", "OMA"], ["SYR", "CLE"], ["MRY", "SLC"], ["AVP", "ORD"], ["RST", "MSP"], ["PHL", "ORF"], ["ROC", "BWI"], ["MSO", "SFO"], ["MSP", "MDT"], ["HPN", "TPA"], ["TUS", "MDW"], ["EUG", "PDX"], ["JFK", "CMH"], ["HNL", "ORD"], ["ORD", "RDU"], ["ATL", "CHS"], ["PSP", "SEA"], ["CLT", "SDF"], ["COS", "MEM"], ["VLD", "ATL"], ["BUF", "PHL"], ["ATL", "TOL"], ["DFW", "EGE"], ["YUM", "LAS"], ["OAK", "MCI"], ["MCI", "TUS"], ["PNS", "DFW"], ["GEG", "LGB"], ["SEA", "JNU"], ["DAB", "ATL"], ["SFO", "BWI"], ["BOS", "CVG"], ["SLC", "CMH"], ["MIA", "EWR"], ["ATL", "PDX"], ["IAD", "PHL"], ["JFK", "AUS"], ["JFK", "HDN"], ["MCO", "IAD"], ["LGA", "CMH"], ["BNA", "STL"], ["BNA", "MSY"], ["PBI", "ATL"], ["MKE", "SFO"], ["JFK", "ORD"], ["IAD", "DTW"], ["SLC", "LAS"], ["SEA", "PHL"], ["LGA", "VPS"], ["DRO", "ABQ"], ["MDT", "DFW"], ["BOS", "STT"], ["IND", "PIT"], ["IAD", "SAN"], ["ANC", "ATL"], ["JAX", "BHM"], ["BWI", "HOU"], ["SAT", "CLT"], ["GUC", "DEN"], ["CAE", "DFW"], ["FLL", "AUS"], ["HOU", "HRL"], ["STT", "ATL"], ["EWR", "CMH"], ["SBP", "FAT"], ["MEM", "CLE"], ["SWF", "ATL"], ["MKE", "TUS"], ["CLE", "ABQ"], ["SAT", "SLC"], ["CLE", "SAV"], ["ISP", "TPA"], ["MCO", "LAS"], ["LAS", "MKE"], ["PSP", "DFW"], ["CVG", "JFK"], ["IAD", "SPI"], ["OAK", "SNA"], ["DTW", "ITH"], ["BHM", "STL"], ["IAH", "BNA"], ["BWI", "BUF"], ["MCO", "IND"], ["DCA", "MHT"], ["EYW", "ATL"], ["ORD", "GEG"], ["MAF", "DAL"], ["LAS", "GEG"], ["IAD", "BUR"], ["MDT", "DTW"], ["BNA", "MSP"], ["LEX", "LGA"], ["CHS", "EWR"], ["SLC", "PSP"], ["ORD", "MDT"], ["ONT", "TUS"], ["PDX", "ONT"], ["MYR", "LGA"], ["PHX", "OGG"], ["DTW", "LAS"], ["ANC", "JNU"], ["RDU", "CVG"], ["ATL", "VPS"], ["JFK", "BGR"], ["MEM", "BDL"], ["OTH", "PDX"], ["PHX", "MDW"], ["DEN", "GRR"], ["MSP", "LIT"], ["LIH", "KOA"], ["BUR", "PSP"], ["MCI", "OMA"], ["CMH", "MCI"], ["OAK", "TUS"], ["MEM", "CLT"], ["BHM", "EWR"], ["TPA", "CLT"], ["OMA", "CVG"], ["TUS", "ABQ"], ["JFK", "CLE"], ["PHL", "SEA"], ["PHX", "LAX"], ["BIS", "DEN"], ["PHX", "ABQ"], ["BDL", "PHL"], ["SLC", "FCA"], ["BUF", "RSW"], ["MHT", "IAD"], ["DEN", "MSO"], ["STL", "OMA"], ["MSP", "MCI"], ["SMF", "LAX"], ["BZN", "MSP"], ["SFO", "EUG"], ["ABQ", "CLE"], ["OME", "ANC"], ["SFO", "MDW"], ["AVL", "CVG"], ["COS", "MKE"], ["MFR", "PHX"], ["MCO", "PBI"], ["IAH", "BDL"], ["MKE", "GRR"], ["MCI", "ABQ"], ["DFW", "GRR"], ["MKE", "BNA"], ["HDN", "ORD"], ["DCA", "LAX"], ["KOA", "SAN"], ["SBN", "ORD"], ["PBI", "LGA"], ["DFW", "CHA"], ["FLL", "LGB"], ["SBP", "LAS"], ["GSO", "MSP"], ["SNA", "PDX"], ["ORF", "CLT"], ["SLC", "ATL"], ["MCO", "CLT"], ["DSM", "DEN"], ["JAX", "IAH"], ["BOI", "DEN"], ["DTW", "EWR"], ["ALB", "ATL"], ["ABQ", "LAX"], ["MKE", "GRB"], ["EVV", "DTW"], ["BTR", "CVG"], ["EGE", "MIA"], ["TYS", "IAD"], ["MKE", "STL"], ["MSY", "LAX"], ["ROC", "ATL"], ["IAH", "CRW"], ["AGS", "LGA"], ["DCA", "MSN"], ["MKE", "PIT"], ["TPA", "SDF"], ["SJU", "FLL"], ["DFW", "SJC"], ["LFT", "IAH"], ["MLI", "LAS"], ["MKE", "PHL"], ["IND", "XNA"], ["TPA", "CMH"], ["LGA", "GSP"], ["BNA", "MEM"], ["IAH", "OKC"], ["RDU", "MIA"], ["OKC", "PHX"], ["MSY", "MCO"], ["ANC", "DLG"], ["DEN", "RSW"], ["CLT", "PDX"], ["IND", "MKE"], ["TPA", "BUF"], ["DFW", "GRK"], ["CLT", "IAH"], ["PHX", "TPA"], ["DTW", "PIT"], ["LGA", "PBI"], ["SAN", "BOS"], ["OKC", "BWI"], ["CMH", "BOS"], ["ANC", "FAI"], ["SLC", "STL"], ["SLC", "COD"], ["PHX", "MCI"], ["PIT", "GRB"], ["BWI", "SAV"], ["PHL", "DEN"], ["GSO", "LGA"], ["BWI", "CLE"], ["SBA", "PHX"], ["ORD", "CMI"], ["SLC", "SBA"], ["SLC", "YUM"], ["DTW", "SCE"], ["SEA", "MCO"], ["MSY", "DEN"], ["IAH", "MGM"], ["FAR", "MSP"], ["SBA", "SJC"], ["ABQ", "PDX"], ["SYR", "PHL"], ["ATL", "BZN"], ["MCO", "MHT"], ["SFO", "CLE"], ["PSG", "JNU"], ["PIT", "DEN"], ["PBI", "CLE"], ["LEX", "DFW"], ["HSV", "MEM"], ["EGE", "JFK"], ["TYS", "ORD"], ["ATL", "AUS"], ["STL", "PHL"], ["BWI", "GRR"], ["CLE", "BDL"], ["ORD", "GPT"], ["TUL", "MCI"], ["ABQ", "DEN"], ["DFW", "MSP"], ["AZO", "XNA"], ["PBI", "JFK"], ["DFW", "BUF"], ["PDX", "MCI"], ["RDU", "IAD"], ["ATL", "JFK"], ["SGF", "FSD"], ["SIT", "JNU"], ["ERI", "PIT"], ["MEM", "EVV"], ["SFO", "CVG"], ["CLE", "MCO"], ["LAS", "YUM"], ["PHX", "DSM"], ["CLT", "MCO"], ["OKC", "SMF"], ["BOI", "ORD"], ["LBB", "ABQ"], ["ORD", "HDN"], ["ATL", "ALB"], ["DTW", "TVC"], ["MEM", "PIT"], ["TUS", "JFK"], ["DAY", "DEN"], ["EWR", "CVG"], ["BDL", "BNA"], ["AUS", "OKC"], ["HNL", "ATL"], ["SJU", "ORD"], ["LGB", "SMF"], ["BDL", "LAX"], ["BET", "ANC"], ["MEM", "IAH"], ["ROC", "MSP"], ["MKE", "ATW"], ["PDX", "MDW"], ["ATL", "PHX"], ["SAV", "EWR"], ["PHL", "SJU"], ["CHA", "ORD"], ["PBI", "EWR"], ["BOS", "PHX"], ["CLT", "MKE"], ["CLT", "DTW"], ["FNT", "MSP"], ["IAH", "AMA"], ["SLC", "SNA"], ["DAB", "CLT"], ["DEN", "MRY"], ["DEN", "FCA"], ["SFO", "JFK"], ["SRQ", "IND"], ["DTW", "CHS"], ["BDL", "RSW"], ["JAN", "HOU"], ["GEG", "LAS"], ["CVG", "IAD"], ["JFK", "SMF"], ["SNA", "EWR"], ["PWM", "ATL"], ["AUS", "DTW"], ["RNO", "PIH"], ["ONT", "TUL"], ["SFO", "CEC"], ["SMF", "ATL"], ["LAS", "PIT"], ["DFW", "SEA"], ["BNA", "ORF"], ["BNA", "FSD"], ["MCO", "OKC"], ["SLC", "FAI"], ["IAD", "SJU"], ["SFO", "CLT"], ["ABQ", "ORD"], ["DTW", "DCA"], ["MSP", "MLI"], ["ANC", "ADQ"], ["TPA", "GPT"], ["ATL", "AEX"], ["BTV", "ORD"], ["CHA", "CVG"], ["CAK", "LAS"], ["LIH", "DEN"], ["CVG", "LGA"], ["EWR", "STT"], ["CLT", "SFO"], ["DEN", "GTF"], ["LAX", "JAC"], ["SLC", "GTF"], ["AUS", "SNA"], ["BTV", "IND"], ["RDD", "SBA"], ["MEM", "MIA"], ["SRQ", "MDW"], ["DEN", "LIT"], ["SJU", "IAH"], ["IAH", "LEX"], ["DFW", "XNA"], ["DTW", "CAE"], ["PHX", "DCA"], ["PMD", "SFO"], ["MBS", "DTW"], ["EGE", "MSP"], ["RDU", "PHX"], ["LGA", "MSY"], ["MKE", "MSN"], ["DEN", "PIH"], ["TOL", "ATL"], ["BWI", "PHL"], ["TRI", "MEM"], ["PHX", "GJT"], ["ORD", "OKC"], ["MSP", "STL"], ["SLC", "SGF"], ["DEN", "OGG"], ["ATL", "MEM"], ["MDW", "RDU"], ["FLL", "ATL"], ["MSP", "SMF"], ["MCI", "SAN"], ["AUS", "IAD"], ["SLC", "CLE"], ["DAY", "ATL"], ["MSY", "MSP"], ["ROA", "IAD"], ["BDL", "CLE"], ["BIL", "GTF"], ["GEG", "ONT"], ["SEA", "DFW"], ["SEA", "EWR"], ["PDX", "MSN"], ["SDF", "SPI"], ["HTS", "CVG"], ["LAX", "OXR"], ["SMF", "CLT"], ["SFO", "MRY"], ["ATW", "DSM"], ["ORD", "MSO"], ["CHS", "DFW"], ["DCA", "MKE"], 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"MDW"], ["TWF", "SUN"], ["ASE", "PHX"], ["RSW", "ISP"], ["ROW", "DFW"], ["BNA", "DEN"], ["BWI", "LGA"], ["OKC", "AUS"], ["CLE", "FLL"], ["MCI", "SAT"], ["AUS", "FLL"], ["SBA", "LAX"], ["SJU", "PHL"], ["LAX", "DEN"], ["SJC", "ATL"], ["ATL", "AVL"], ["WRG", "KTN"], ["CMH", "MIA"], ["ATL", "MLU"], ["MKE", "OMA"], ["DFW", "IND"], ["SLC", "OGG"], ["MCI", "SLC"], ["ALO", "MSP"], ["DSM", "CWA"], ["FLL", "LGA"], ["CLT", "ALB"], ["DFW", "GSP"], ["PVD", "MSP"], ["SLC", "MTJ"], ["LGA", "STT"], ["CHA", "DFW"], ["SDF", "MEM"], ["MEM", "MSY"], ["AUS", "TUS"], ["MDW", "DTW"], ["TPA", "PIT"], ["MCI", "ICT"], ["CDC", "SLC"], ["BFL", "LAS"], ["RNO", "MDW"], ["ANC", "DFW"], ["FLL", "MCI"], ["FLL", "CAK"], ["GNV", "ATL"], ["SEA", "SFO"], ["CRW", "IAH"], ["MCO", "SEA"], ["CVG", "BHM"], ["EWR", "MHT"], ["OKC", "SAT"], ["LAX", "LAS"], ["PHF", "TPA"], ["BOS", "CHS"], ["IAH", "TPA"], ["AUS", "DEN"], ["DFW", "CMI"], ["CLT", "SAV"], ["MCO", "BOS"], ["LAX", "MSY"], ["MSP", "JAX"], ["AUS", "LAX"], ["SBA", "SLC"], ["BOI", "ATW"], ["AUS", "LBB"], ["ATL", "ILM"], ["SAV", "CHS"], ["OGG", "SMF"], ["EWR", "TUL"], ["DTW", "MBS"], ["RDU", "JFK"], ["BNA", "EWR"], ["DTW", "MSP"], ["MEM", "PHX"], ["BTR", "IAH"], ["SLC", "IDA"], ["DCA", "PBI"], ["BNA", "PVD"], ["SJC", "PDX"], ["MSP", "SAV"], ["SAV", "MSP"], ["ABQ", "CVG"], ["DEN", "MEM"], ["OMA", "ABQ"], ["CMH", "PBI"], ["HNL", "DFW"], ["LAS", "DEN"], ["OAK", "LAX"], ["EGE", "EWR"], ["XNA", "LGA"], ["MSN", "DEN"], ["LAS", "MRY"], ["MCO", "RDU"], ["MDW", "AUS"], ["RDU", "LAX"], ["FLL", "DFW"], ["CLL", "IAH"], ["EWN", "ATL"], ["TPA", "BHM"], ["ISP", "BWI"], ["LAX", "IND"], ["MKE", "ORD"], ["ATL", "HNL"], ["MEM", "CMH"], ["CLT", "MCI"], ["BOS", "MKE"], ["SLC", "MSP"], ["MKE", "MEM"], ["IAD", "PVD"], ["SFO", "MOD"], ["OMA", "MKE"], ["AUS", "SJC"], ["JAN", "DFW"], ["CLE", "BNA"], ["PHX", "BNA"], ["PIA", "DFW"], ["ORD", "BUF"], ["SMF", "RDD"], ["BHM", "CVG"], ["CLT", "RSW"], ["MSO", "SLC"], ["LAS", "MCI"], ["PHL", "BOS"], ["LGA", "IND"], ["ATL", "CRW"], ["MLI", "DEN"], ["XNA", "RDU"], ["HNL", "PDX"], ["GSP", "IAD"], ["IAH", "LFT"], ["JAN", "MDW"], ["PDX", "IAD"], ["PHL", "CLT"], ["PVD", "PHL"], ["MCI", "MIA"], ["PNS", "CLT"], ["BWI", "DAY"], ["IAH", "XNA"], ["HOU", "BNA"], ["BWI", "PBI"], ["MEM", "CVG"], ["DFW", "OKC"], ["BFL", "SFO"], ["ATL", "SEA"], ["EWR", "ORD"], ["DFW", "SDF"], ["CVG", "LIT"], ["AZO", "CVG"], ["CVG", "BDL"], ["MSN", "CVG"], ["MCO", "LAX"], ["PHX", "MIA"], ["BOS", "PIT"], ["RSW", "BOS"], ["EWR", "TUS"], ["LGA", "CAE"], ["BGR", "BOS"], ["DEN", "SJC"], ["BNA", "HOU"], ["RDU", "MEM"], ["PHX", "SNA"], ["ATL", "ELP"], ["PVD", "CLT"], ["ORD", "MCO"], ["GSO", "IAH"], ["IAH", "EWR"], ["BDL", "CLT"], ["ROC", "IAD"], ["BNA", "ONT"], ["MCO", "DFW"], ["ELP", "PHX"], ["EWR", "XNA"], ["ATL", "MFE"], ["LGB", "FAT"], ["OMA", "ATW"], ["MKE", "MCI"], ["TUL", "AUS"], ["IND", "JAX"], ["EWR", "LIT"], ["OAK", "BUR"], ["RKS", "DEN"], ["PSP", "ONT"], ["DFW", "ABI"], ["MCI", "BWI"], ["CLE", "OKC"], ["SAT", "ELP"], ["ISP", "MDW"], ["SFO", "RDM"], ["ATL", "DAB"], ["STX", "CLT"], ["TPA", "BWI"], ["CVG", "ROC"], ["TYS", "DTW"], ["TUL", "STL"], ["OKC", "EWR"], ["MEI", "ATL"], ["BFL", "PHX"], ["SGF", "ORD"], ["DEN", "TYS"], ["SJU", "EWR"], ["DFW", "PHX"], ["MCO", "PFN"], ["BUF", "BOS"], ["CLE", "SAT"], ["IAD", "ATL"], ["CMH", "RSW"], ["IAH", "PBI"], ["STT", "PHL"], ["PIT", "MSP"], ["SFO", "LGB"], ["LAS", "HOU"], ["MSP", "FCA"], ["MRY", "PHX"], ["ATL", "OAJ"], ["DEN", "BOI"], ["CVG", "BGR"], ["BHM", "TPA"], ["PNS", "MCO"], ["KTN", "WRG"], ["GRR", "MKE"], ["DFW", "LEX"], ["LGB", "GEG"], ["JAX", "CVG"], ["MEM", "ORF"], ["IAH", "PSP"], ["BUR", "SEA"], ["PHX", "HNL"], ["PHX", "FAT"], ["PDX", "LGB"], ["BUF", "DCA"], ["SJC", "SNA"], ["MCI", "SEA"], ["SUN", "TWF"], ["HDN", "MSP"], ["CVG", "EVV"], ["DEN", "OMA"], ["TPA", "AUS"], ["AUS", "ATL"], ["MIA", "CVG"], ["PHX", "TEX"], ["MHT", "BWI"], ["MQT", "GRB"], ["BHM", "ATL"], ["RSW", "JFK"], ["CRW", "DTW"], ["CMH", "STL"], ["IAD", "BNA"], ["SDF", "RDU"], ["HOU", "JAN"], ["MSY", "RDU"], ["MDW", "SMF"], ["SLC", "BNA"], ["HOU", "MAF"], ["BDL", "DCA"], ["LAS", "ISP"], ["COS", "SLC"], ["LGB", "IAD"], ["SJC", "PHX"], ["RNO", "DFW"], ["CLE", "SDF"], ["MDW", "SEA"], ["ATL", "PIA"], ["PHX", "DRO"], ["MDW", "MSP"], ["DEN", "STL"], ["SAV", "ATL"], ["DTW", "SWF"], ["PHL", "CVG"], ["SRQ", "DCA"], ["MIA", "TPA"], ["ORD", "ABQ"], ["COS", "ONT"], ["STX", "ATL"], ["DTW", "PLN"], ["DEN", "CPR"], ["RDU", "BDL"], ["HOU", "ELP"], ["ATL", "CAE"], ["ATL", "MCI"], ["IAD", "PIT"], ["CHS", "JAX"], ["CLT", "LGA"], ["CVG", "SRQ"], ["FLL", "CLT"], ["IAH", "AVL"], ["SFO", "IAD"], ["XNA", "COS"], ["BWI", "TPA"], ["FLL", "CVG"], ["MDW", "ATL"], ["IAH", "CHS"], ["TUL", "MSP"], ["OKC", "TUL"], ["LIT", "DFW"], ["MIA", "STL"], ["LAX", "ABQ"], ["LAX", "JAX"], ["RSW", "HPN"], ["ONT", "LAX"], ["TUS", "OAK"], ["ATL", "BWI"], ["TPA", "MHT"], ["MHT", "CLT"], ["ORD", "DFW"], ["DAB", "EWR"], ["SFO", "STL"], ["YUM", "PHX"], ["PDX", "SMF"], ["HSV", "ATL"], ["ISP", "ATL"], ["ATL", "PWM"], ["IAD", "SYR"], ["CRP", "HOU"], ["FLL", "PSE"], ["DTW", "ERI"], ["LAX", "RNO"], ["XNA", "FAR"], ["ITH", "DTW"], ["GSP", "CLE"], ["SAV", "IAH"], ["BHM", "HOU"], ["SNA", "OAK"], ["MEM", "CHS"], ["TUL", "EWR"], ["MRY", "SFO"], ["CLT", "IND"], ["SEA", "KOA"], ["DEN", "CAK"], ["PDX", "EWR"], ["OAK", "HNL"], ["RIC", "BOS"], ["TYS", "CLE"], ["HNL", "LIH"], ["SFO", "ACV"], ["CVG", "CHA"], ["OKC", "DAL"], ["BUR", "LAS"], ["ATL", "JAX"], ["EWR", "ABQ"], ["SMF", "IAD"], ["DAL", "BHM"], ["SJC", "MSP"], ["SAN", "BNA"], ["ORD", "XNA"], ["DTW", "MHT"], ["TUS", "PHX"], ["MCO", "BHM"], ["JAX", "MSY"], ["DFW", "BMI"], ["SJC", "DEN"], ["IND", "CLE"], ["OMA", "DSM"], ["JFK", "BTV"], ["MHT", "EWR"], ["SFO", "KOA"], ["TPA", "DAY"], ["LAS", "TUL"], ["SWF", "PBI"], ["DEN", "BDL"], ["TPA", "DTW"], ["MCO", "CVG"], ["HDN", "LGA"], ["SJC", "RNO"], ["JFK", "SEA"], ["IAD", "MSY"], ["LAX", "SMF"], ["HOU", "TPA"], ["MEM", "DSM"], ["FAT", "ONT"], ["IAH", "CLL"], ["LMT", "PDX"], ["TPA", "LAS"], ["IND", "RDU"], ["ATL", "ABQ"], ["CMI", "SPI"], ["LIT", "CVG"], ["GSO", "DFW"], ["HOU", "ABQ"], ["JAC", "SLC"], ["LGA", "TPA"], ["LIT", "SAT"], ["TVC", "CVG"], ["LAX", "CLD"], ["LGA", "ORD"], ["COS", "CVG"], ["LAX", "ICT"], ["OGG", "SEA"], ["MSP", "RSW"], ["SNA", "MSP"], ["EWR", "CLT"], ["ORF", "ATL"], ["SAN", "SJC"], ["BUR", "SJC"], ["LIT", "DTW"], ["FWA", "ORD"], ["CLT", "TLH"], ["IND", "DEN"], ["ONT", "DEN"], ["BDL", "MCO"], ["DCA", "PHL"], ["MSP", "ATW"], ["SFO", "PMD"], ["CWA", "DTW"], ["BDL", "IAD"], ["IAD", "IAH"], ["MKE", "CVG"], ["LGB", "ONT"], ["BNA", "AUS"], ["MIA", "ORD"], ["EWR", "MCI"], ["SJU", "CLE"], ["AUS", "JAX"], ["MSY", "OKC"], ["JAX", "HOU"], ["AUS", "JFK"], ["PSP", "ORD"], ["SNA", "STL"], ["MEM", "RSW"], ["IAD", "OKC"], ["ABQ", "IAD"], ["STL", "CMH"], ["MEM", "SHV"], ["IAH", "RSW"], ["JFK", "MSY"], ["MCO", "MDT"], ["JAN", "DCA"], ["RNO", "DEN"], ["GRR", "MKG"], ["MSP", "RDU"], ["MEM", "LIT"], ["MKE", "AVP"], ["JFK", "ONT"], ["MDW", "PHX"], ["HRL", "DAL"], ["MCO", "MSY"], ["SMF", "SEA"], ["GRB", "CVG"], ["TUS", "SMF"], ["CLE", "DAB"], ["MSY", "BHM"], ["SLC", "ONT"], ["SMF", "GEG"], ["HOU", "CRP"], ["OKC", "ATL"], ["CMH", "DCA"], ["DEN", "RFD"], ["TUS", "SAN"], ["PWM", "ORD"], ["CMH", "PHL"], ["FAI", "SCC"], ["LAX", "BDL"], ["CLT", "PWM"], ["MCI", "MGM"], ["BWI", "CLT"], ["MSY", "CLT"], ["YAK", "CDV"], ["DTW", "PWM"], ["CHS", "DTW"], ["SLC", "AUS"], ["CVG", "RIC"], ["MSN", "MEM"], ["MDW", "SAN"], ["EWR", "FLL"], ["BZN", "SFO"], ["SMF", "BFL"], ["GEG", "ORD"], ["TYS", "DEN"], ["DFW", "AMA"], ["EVV", "ATL"], ["IAH", "MKE"], ["TPA", "MIA"], ["LIH", "OGG"], ["RNO", "SFO"], ["TRI", "CLT"], ["RDU", "SAT"], ["ERI", "DTW"], ["CVG", "MEM"], ["TUL", "DFW"], ["BTM", "SLC"], ["ALB", "CLT"], ["BUR", "OAK"], ["DFW", "OMA"], ["SUN", "SLC"], ["FNT", "MCO"], ["RDU", "CMH"], ["FAT", "SLC"], ["RIC", "CVG"], ["RSW", "CLT"], ["LGA", "TVC"], ["SAN", "SAT"], ["MEM", "TYS"], ["TUS", "ONT"], ["JFK", "DEN"], ["SFO", "LIH"], ["SGU", "PIH"], ["FAI", "SEA"], ["LAS", "DCA"], ["DTW", "ROC"], ["BWI", "SAN"], ["MHT", "PHX"], ["MSY", "PHL"], ["ALB", "CLE"], ["AVP", "ATL"], ["GSP", "DTW"], ["BOS", "MSP"], ["DTW", "JFK"], ["ORF", "IAH"], ["MCO", "RIC"], ["CVG", "ALB"], ["BNA", "SAT"], ["DFW", "ORF"], ["PDX", "LAS"], ["SAT", "SMF"], ["ORD", "BTR"], ["MSP", "BTV"], ["CLT", "PBI"], ["JFK", "PIT"], ["SMF", "TUL"], ["IAH", "SDF"], ["MSY", "MCI"], ["IAD", "FLL"], ["BWI", "MSY"], ["FLL", "PVD"], ["TLH", "MIA"], ["FAT", "SBA"], ["BNA", "IAH"], ["MKE", "LAX"], ["MLU", "ATL"], ["TUL", "CVG"], ["DFW", "ANC"], ["SFO", "IDA"], ["ELP", "LAS"], ["EWR", "PSE"], ["DAL", "MCI"], ["CLE", "MDW"], ["RIC", "MSP"], ["PBI", "BDL"], ["LYH", "ATL"], ["ABQ", "DFW"], ["ANC", "PDX"], ["DEN", "JAC"], ["BOS", "CLE"], ["LBB", "DFW"], ["CAK", "DTW"], ["TUL", "SLC"], ["TUS", "LAS"], ["MSY", "DCA"], ["IAH", "LAX"], ["HPN", "DTW"], ["BWI", "BOS"], ["PVD", "LAS"], ["DFW", "BOS"], ["SMF", "SBA"], ["PBI", "SWF"], ["PSP", "MSP"], ["XNA", "EWR"], ["MSP", "FSD"], ["LAS", "IND"], ["IAH", "CAE"], ["SFO", "ORD"], ["HOU", "PHL"], ["JFK", "IND"], ["MDW", "PIT"], ["SAT", "IND"], ["MIA", "XNA"], ["CWA", "MLI"], ["OKC", "SAN"], ["LAX", "SJU"], ["OKC", "CLE"], ["AEX", "ATL"], ["PSG", "WRG"], ["STL", "JFK"], ["CID", "DSM"], ["ORD", "JAN"], ["RDU", "BWI"], ["BOS", "ACK"], ["SHV", "ORD"], ["SRQ", "CLE"], ["MIA", "IAH"], ["SWF", "BOS"], ["IAH", "STL"], ["CLT", "FAY"], ["MKE", "ABE"], ["CVG", "RDU"], ["DTW", "IAD"], ["HHH", "ATL"], ["FLL", "BUF"], ["SFO", "BZN"], ["AKN", "ANC"], ["FLL", "TPA"], ["MCO", "IAH"], ["BTR", "DEN"], ["SMF", "SAN"], ["JAC", "MSP"], ["AUS", "OAK"], ["MDW", "IND"], ["TUL", "OMA"], ["SAN", "CVG"], ["ORD", "JFK"], ["OGG", "SNA"], ["GRB", "DSM"], ["MAF", "DFW"], ["LAX", "SAT"], ["CVG", "CMH"], ["DFW", "TYR"], ["MEM", "CHA"], ["SFO", "MKE"], ["ATL", "LGA"], ["ATL", "TRI"], ["LAS", "LBB"], ["DTW", "ELM"], ["RDU", "DTW"], ["STL", "IAH"], ["FAI", "MSP"], ["GEG", "DEN"], ["BOS", "MCO"], ["LAS", "BWI"], ["DTW", "MDT"], ["GSP", "IAH"], ["SLC", "SBP"], ["DSM", "DFW"], ["ORD", "CPR"], ["SDF", "DFW"], ["IAH", "EGE"], ["IYK", "BFL"], ["ATL", "ONT"], ["MCO", "DTW"]];
diff --git a/thumbnail.png b/thumbnail.png
	'use strict';

	var landingColor = '#fe761e';
	var takeOffColor = '#3081dd';
	var lineColor = '#5297ee';
	var fps = 40;
	var curveFactor = 40;
	var speed = 0.9; // between 0 & 1
	var drawLines = true;
	var batchSize = 12;


	function initMap(selector) {
	var airportMap = {};
	var $flightmap = d3.select(selector).node();
	var width = 950;
	var height = 500;
	var mapScale = 1050;
	var projection = d3.geoAlbersUsa()
	.scale(mapScale).translate([width / 2, height / 2]);

	var path = d3.geoPath().pointRadius(1.2).projection(projection);

	var svg = d3.select(selector).append('svg')
	.attr('preserveAspectRatio', 'xMidYMid')
	.attr('viewBox', '0 0 ' + width + ' ' + height)
	.attr('width', width).attr('height', height);

	var canvasEl = d3.select(selector)
	.append('canvas')
	.attr('style', 'position:absolute; top:0; left:0')
	.attr('width', width)
	.attr('height', height);

	var canvas = canvasEl.node();
	var ctx = canvas.getContext('2d');
	var points = [];
	var batchCount = 0;

	function animate() {
	draw();
	// request another frame
	setTimeout(function () {
	window.requestAnimationFrame(animate);
	}, 1000 / fps);
	}

	// draw the current frame based on sliderValue
	function draw() {
	ctx.clearRect(0, 0, canvas.width, canvas.height);

	for (var i = 0; i < points.length; i++) {
	if (i > batchCount) {
	// for progressive animation
	batchCount += batchSize;
	break;
	}

	var point = points[i],
	start = point.start,
	end = point.end,
	progress = point.progress;

	var wayPoint = helpers.getWaypointXY(start, end, 90);
	var controlPt = { x: wayPoint.x, y: wayPoint.y - curveFactor };
	ctx.beginPath();
	var percentFactor = progress / 100;
	var xy = helpers.getQuadraticBezierXY(start, controlPt, end, percentFactor);
	point.progress += speed;

	// when to draw lines
	if (drawLines && progress < 101) {
	helpers.drawLine(ctx, start, end, controlPt, lineColor);
	}

	// when to draw dots
	if (progress > 0 && progress < 10) {
	helpers.drawDot(ctx, xy, 2.5, takeOffColor, takeOffColor);
	} else if (progress < 90) {
	helpers.drawDot(ctx, xy, 4);
	} else if (progress > 90 && progress < 101) {
	helpers.drawDot(ctx, xy, 2.5, landingColor, landingColor);
	} else {
	point.progress = 0; // reset progress
	}
	}
	}

	function ready(error, topo, airports) {
	if (error) throw error;

	svg.append('g').attr('class','states').selectAll('path')
	.data(topojson.feature(topo, topo.objects.states).features).enter()
	.append('path').attr('d', path);

	svg.append('g').attr('class', 'airports').selectAll('path')
	.data(topojson.feature(airports, airports.objects.airports).features).enter()
	.append('path').attr('id', function (d) {
	return d.id;
	}).attr('d', path);

	var geos = topojson.feature(airports, airports.objects.airports).features;
	geos.forEach(function (geo) {
	airportMap[geo.id] = geo.geometry.coordinates;
	});

	points = helpers.generatePointsFromMap(airportMap, window.routes, projection);
	animate();
	}

	d3.queue()
	.defer(d3.json, 'https://nodeassets.nbcnews.com/cdnassets/projects/2017/08/airplane-mode/us-states.json')
	.defer(d3.json, 'https://nodeassets.nbcnews.com/cdnassets/projects/2017/08/airplane-mode/us-airports-major.topo.json')
	.await(ready);

	}
	window.helpers = {}

	helpers.drawDot = function drawDot(ctx, point, size) {
	var fill = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : '#ccc';
	var stroke = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : '#ccc';

	ctx.fillStyle = fill;
	ctx.strokeStyle = stroke;
	ctx.lineWidth = 0.2;
	ctx.beginPath();
	ctx.arc(point.x, point.y, size, 0, Math.PI * 2, false);
	// var p = new window.Path2D('M10 10 h 80 v 80 h -80 Z')
	ctx.closePath();
	ctx.fill();
	ctx.stroke();
	}

	helpers.drawLine = function drawLine(ctx, start, end, controlPt, color) {
	var lineWidth = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : 0.2;

	ctx.moveTo(start.x, start.y);
	ctx.quadraticCurveTo(controlPt.x, controlPt.y, end.x, end.y); // curved lines
	// ctx.lineTo(end.x, end.y) // straight lines
	ctx.lineJoin = 'round';
	ctx.lineCap = 'round';
	ctx.strokeStyle = color;
	ctx.lineWidth = lineWidth;
	ctx.stroke();
	}

	helpers.generatePointsFromMap = function generatePointsFromMap(map, routes, projection) {
	var points = [];
	routes.forEach(function (route, idx) {
	var origin = map[route[0]];
	var dest = map[route[1]];
	if (origin && dest && origin.length && dest.length) {
	var startXY = projection(origin) \|\| [0, 0];
	var endXY = projection(dest) \|\| [0, 0];
	var start = { x: startXY[0], y: startXY[1] };
	var end = { x: endXY[0], y: endXY[1] };
	var name = route;
	var onMap = end.x > 0 && start.x > 0;
	if (onMap) {
	points.push({ idx: idx, name: name, start: start, end: end, progress: 0 });
	}
	}
	});
	console.log('points:', points.length)
	return points;
	}

	helpers.getWaypointXY = function getWaypointXY(startPoint, endPoint, percent) {
	var factor = percent / 100;
	var x = startPoint.x + (endPoint.x - startPoint.x) * factor;
	var y = startPoint.y + (endPoint.y - startPoint.y) * factor;
	return { x: x, y: y };
	}

	// quadratic bezier: percent is 0-1
	helpers.getQuadraticBezierXY = function getQuadraticBezierXY(startPt, controlPt, endPt, percent) {
	var x = Math.pow(1 - percent, 2) * startPt.x + 2 * (1 - percent) * percent * controlPt.x + Math.pow(percent, 2) * endPt.x;
	var y = Math.pow(1 - percent, 2) * startPt.y + 2 * (1 - percent) * percent * controlPt.y + Math.pow(percent, 2) * endPt.y;
	return { x: x, y: y };
	}
	<!DOCTYPE html>
	<head>
	<meta charset="utf-8">
	<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.10.2/d3.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/3.0.2/topojson.min.js"></script>
	<script src="routes.js"></script>
	<script src="helpers.js"></script>
	<script src="bundle.js"></script>
	<style>
	body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }

	.states {
	fill: #696969;
	stroke: #6cb0e0;
	stroke-width: 0.5px;
	stroke-linecap: round;
	stroke-linejoin: round;
	}

	.airports {
	fill: #000;
	stroke: transparent;
	stroke-width: 0.5px;
	stroke-linecap: round;
	stroke-linejoin: round;
	}

	</style>
	</head>

	<body>
	<div id="flightMap"></div>
	<div>Blue dots = takeoff
	<div>Orange dots = landing</div>
	<script>
	initMap('#flightMap')
	</script>
	</body>