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4 delphine 1 
//#include "GPX.js"
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(function() {
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function d2h(d) {
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	var hex = '0123456789ABCDEF';
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	var r = '';
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	d = Math.floor(d);
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	while (d != 0) {
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		r = hex[d % 16] + r;
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		d = Math.floor(d / 16);
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	}
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	while (r.length < 2) r = '0' + r;
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	return r;
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}
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function gradient(color) {
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	// First arc (0, PI) in HSV colorspace
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	function f2h(d) { return d2h(256 * d); }
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	if (color < 0)
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		return "#FF0000";
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	else if (color < 1.0/3)
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		return "#FF" + f2h(3 * color) + "00";
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	else if (color < 2.0/3)
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		return "#" + f2h(2 - 3 * color) + "FF00";
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	else if (color < 1)
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		return "#00FF" + f2h(3 * color - 2);
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	else
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		return "#00FFFF";
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};
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function gpx2time(s) {
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	// 2011-09-24T12:07:53Z
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	if (s.length != 10 + 1 + 8 + 1)
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		return new Date();
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	return new Date(s);
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};
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L.GPX.include({
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	options: {
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		maxSpeed: 110,
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		chunks: 200
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	},
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	speedSplitEnable: function(options) {
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		L.Util.setOptions(this, options);
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		return this.on('addline', this.speed_split, this);
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	},
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	speedSplitDisable: function() {
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		return this.off('addline', this.speed_split, this);
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	},
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	speed_split: function(e) {
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		var l = e.line.pop(), ll = l.getLatLngs();
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		var chunk = Math.floor(ll.length / this.options.chunks);
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		if (chunk < 3) chunk = 3;
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		var p = null;
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		for (var i = 0; i < ll.length; i += chunk) {
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			var d = 0, t = null;
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			if (i + chunk > ll.length)
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				chunk = ll.length - i;
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			for (var j = 0; j < chunk; j++) {
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				if (p) d += p.distanceTo(ll[i+j]);
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				p = ll[i + j];
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				if (!t) t = gpx2time(p.meta.time);
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			}
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			p = ll[i + chunk - 1];
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			t = (gpx2time(p.meta.time) - t) / (3600 * 1000);
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			var speed = 0.001 * d / t;
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			//console.info('Dist: ' + d + "; Speed: " + speed);
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			var color = gradient(speed / this.options.maxSpeed);
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			var l = new L.Polyline(ll.slice(i, i+chunk+1), {color: color, weight: 2, opacity: 1});
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			l.bindPopup('Dist: ' + d.toFixed() + "m; Speed: " + speed.toFixed(2) + " km/h");
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			e.line.push(l);
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		}
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	}
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});
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})();