www/plugins/gis/lib/leaflet/plugins/GPX.Speed.js

   1 //#include 'GPX.js'
   2
   3 (function() {
   4
   5 function d2h(d) {
   6         var hex = '0123456789ABCDEF';
   7         var r = '';
   8         d = Math.floor(d);
   9         while (d !== 0) {
  10                 r = hex[d % 16] + r;
  11                 d = Math.floor(d / 16);
  12         }
  13         while (r.length < 2) r = '0' + r;
  14         return r;
  15 }
  16
  17 function gradient(color) {
  18         // First arc (0, PI) in HSV colorspace
  19         function f2h(d) { return d2h(256 * d); }
  20         if (color < 0)
  21                 return '#FF0000';
  22         else if (color < 1.0/3)
  23                 return '#FF' + f2h(3 * color) + '00';
  24         else if (color < 2.0/3)
  25                 return '#' + f2h(2 - 3 * color) + 'FF00';
  26         else if (color < 1)
  27                 return '#00FF' + f2h(3 * color - 2);
  28         else
  29                 return '#00FFFF';
  30 }
  31
  32 function gpx2time(s) {
  33         // 2011-09-24T12:07:53Z
  34         if (s.length !== 10 + 1 + 8 + 1)
  35                 return new Date();
  36         return new Date(s);
  37 }
  38
  39 L.GPX.include({
  40         options: {
  41                 maxSpeed: 110,
  42                 chunks: 200
  43         },
  44
  45         speedSplitEnable: function(options) {
  46                 L.Util.setOptions(this, options);
  47                 return this.on('addline', this.speed_split, this);
  48         },
  49
  50         speedSplitDisable: function() {
  51                 return this.off('addline', this.speed_split, this);
  52         },
  53
  54         speed_split: function(e) {
  55                 var l = e.line.pop(), ll = l.getLatLngs();
  56                 var chunk = Math.floor(ll.length / this.options.chunks);
  57                 if (chunk < 3) chunk = 3;
  58                 var p = null;
  59                 for (var i = 0; i < ll.length; i += chunk) {
  60                         var d = 0, t = null;
  61                         if (i + chunk > ll.length)
  62                                 chunk = ll.length - i;
  63                         for (var j = 0; j < chunk; j++) {
  64                                 if (p) d += p.distanceTo(ll[i+j]);
  65                                 p = ll[i + j];
  66                                 if (!t) t = gpx2time(p.meta.time);
  67                         }
  68                         p = ll[i + chunk - 1];
  69                         t = (gpx2time(p.meta.time) - t) / (3600 * 1000);
  70                         var speed = 0.001 * d / t;
  71                         //console.info('Dist: ' + d + '; Speed: ' + speed);
  72                         var color = gradient(speed / this.options.maxSpeed);
  73                         var poly = new L.Polyline(ll.slice(i, i+chunk+1), {color: color, weight: 2, opacity: 1});
  74                         poly.bindPopup('Dist: ' + d.toFixed() + 'm; Speed: ' + speed.toFixed(2) + ' km/h');
  75                         e.line.push(poly);
  76                 }
  77         }
  78
  79 });
  80 })();